JP3365708B2 - Tractor reinforcement frame structure - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tractor reinforcing frame structure for mounting a front loader on the front side and a rear working machine such as a backhoe on the rear side. More specifically, the present invention relates to a reinforcing frame structure that is configured to be detachable in order to increase the rigidity of a vehicle body such as an agricultural tractor and to connect a working machine in the front-rear direction.

[0002]

2. Description of the Related Art As an example of such a reinforcing frame structure, as shown in JP-A-6-32188, a front loader can be attached to the front and a rear working machine can be attached to the rear so that the tractor can be divided in the left-right direction. There is a reinforced frame structure. In this reinforcing frame structure, a triangular plate holding the rear axle case is fixedly connected to the pipe-shaped left and right frame members. Since the end of the rear axle case is supported while penetrating this triangular plate, the reinforcing frame structure must be laterally assembled to the rear axle case before mounting the rear wheel.

As an example of a further reinforcing frame structure, there is a structure disclosed in US Pat. No. 5,248,237, which is a working machine such as a front loader in the front and a rear working machine such as a backhoe in the rear. Is configured to be attachable.
Here, the reinforcing frame structure is provided with two sets of reinforcing frames on each of the left and right sides of the tractor vehicle body. Both the first reinforcing frame extending outward in the left-right direction of the tractor vehicle body and the second reinforcing frame extending slightly inward thereof are connected and fixed at their front ends to a crossbar member extending in the left-right direction of the vehicle body. .

As another example of the reinforcing frame structure, there is a structure disclosed in German Patent No. 2218891, in which a front loader is connected to the front of the tractor and a backhoe is connected to the rear. Here, a pair of reinforcing frames are provided on the left and right sides of the tractor vehicle body. It is disclosed that the reinforcing frame is connected to the vehicle body via two brackets. A mast mount for mounting the mast of the front loader is formed at the front end of the reinforcing frame.

Further, US Pat. No. 4,737,067 discloses a mounting mechanism (not described as a reinforcing frame) for mounting a working device on a tractor, and here, as an example thereof, a tractor. A pair of frames that are narrower than the width of the vehicle body and extend in the left-right direction are disclosed. It is disclosed that the front end portions of these frames are attached to a transmission case via a bracket or are directly connected to the engine.

[0006]

What is common to the above-mentioned first three prior arts is that the left and right frames are independently connected to the tractor body. As described above, in the structure of the reinforcing frame disclosed in the above-mentioned prior art, each of the reinforcing frames is connected to the tractor vehicle body or various members or brackets connected to the tractor vehicle body from the left and right sides of the vehicle body. When completed as a body assembly, it cannot be mounted on the body of the tractor. Therefore, regarding the assembling property when assembling the reinforcing frame structure to the completed vehicle body, there is a lot of room for improvement including the fourth conventional technique.

Further, in any of the above-mentioned prior arts, when the reinforcing frame structure is connected to the tractor vehicle body, the force is generated in the left and right connecting portions of the front loader and the rear working machine connecting portion is caused by the work of the backhoe. There is no description or specific disclosure of how the force (stress) and the magnitude (magnitude) of the moment transmitted to the tractor body through the reinforcing frame structure can be reduced.

For example, in US Pat. No. 5,248,237, a mast mount of a front loader is provided on a tubular member extending to the left and right sides of a tractor vehicle body. It is formed on a pair of tubular members (or crossbar members) extending in the direction. Each of the crossbar members extending in the left-right direction is connected to the vehicle body via a bracket. Therefore, since the force applied to the right and left masts of the front loader is transmitted from the mast mount to the vehicle body through the tubular member and the bracket, it is considered that the magnitude of the stress or moment applied to the vehicle body is reduced. Since the crossbar member is not extended over the entire width of the tractor vehicle body, most of the strain energy due to the stress or moment generated in the mast mount is
In effect, the left and right sides of the tractor body have to be absorbed.

In the structure of JP-A-6-32188,
It is disclosed that a backhoe as a post-working machine is held by a pair of triangular plates formed in the rear portion of the reinforcing frame. Here, the force generated in the left and right connecting portions of the rear backhoe is directly transmitted to the left and right extended ends of the rear axle case via the pair of left and right triangular plates. Therefore, the force (stress or moment) of the backhoe connection generated due to the force transmitted from the backhoe.
As a result, most of them are directly propagated to the rear axle case.

In the structure of German Patent No. 2218891, the mast is directly attached to the front end portion of the reinforcing frame member extending on the left and right side surfaces of the tractor vehicle body, and the two brackets are provided near the rear end portion thereof. It is connected to the vehicle body. Therefore, the force component and the moment component generated by the work of the front loader are transmitted to the vehicle body through the left and right reinforcing frame members and the bracket.

An important object of the present invention is to make a reinforcing frame structure for mounting a front loader and / or a post-working machine into an integral body so that it can be easily assembled to a tractor body. Is. Another important object of the present invention is that the reinforcing frame structure for mounting the front loader and / or the post-working machine is a rigid one body, and can be easily assembled to the tractor body from below. To do so.

Another object of the present invention is to enable a rear side connecting mechanism, a working machine mounting mechanism and the like to be simply constructed or to be strongly constructed. Another object of the present invention is to prevent the strength of the frame from being reduced by the retaining member and to easily attach the rear portion of the reinforcing frame structure to the tractor vehicle body. Another object of the present invention is to reduce the weight and toughness of the reinforcing frame structure.

[0013]

A first concrete means for solving the problems in the present invention is a tractor in which an engine 2 and a transmission case 3 are connected in the front-rear direction and a front axle frame 4 is extended from the engine 2. mounted on the vehicle body 5, a reinforcing frame structure for mounting a working machine 7 after the front loader 6及beauty rear side of the front side, the tractor body 5
Left and right side frame members 13 extending along the longitudinal direction of the vehicle body on the left and right sides of the vehicle, and crossbar members 14, 1 for connecting at least one of the front, rear, and midway portions of the left and right side frame members 13.
And 5,100, and the front connecting mechanism 16 for connecting the front side of the left and right side frame member 13 to the front of the tractor body 5, left and right
The rear side of the rear connecting mechanism 12 connectable to the rear of the tractor body 5 of the side frame member 13, the loader attachment mechanism 9及beauty after working machine 7 to the front loader 6 can be mounted to allow mounting of has a working machine mounting mechanism 11, left
The right frame member 13 is a crossbar member 14, 15, 100.
The front side connection mechanism 16 and
The front connecting mechanism 16 is connected by the rear connecting mechanism 12.
Propagates from the front loader 6 to the tractor body 5 side.
That a load is capable absorbed by the elastic deformation, the rear side communication
The connection mechanism 12 is transmitted from the rear working machine 7 to the tractor body 5 side.
Apply the load to the relative displacement with respect to the tractor body 5.
Therefore, it can be absorbed .

[0014] Thus, integral reinforcing frame structure 8 has left and right side frame members 13, cross bar member, the front connecting mechanism 16, the rear connecting mechanism 12 and the loader attachment mechanism 9及beauty work industry machine mounting mechanism 11 become things, handling is facilitated, mounting becomes easy for tractor body 5, front loader 6 or supports a load applied from the rear working machine 7, to reduce the load on the tractor body 5.

The second concrete means for solving the problems in the present invention is to connect the engine 2 and the mission case 3 in the front-rear direction and to attach the front axle frame 4 to the tractor body 5 extending from the engine 2, A left and right side frame member which is a reinforcing frame structure for mounting the front loader 6 on the side of the vehicle and / or the rear working machine 7 on the rear side, and which extends along the vehicle longitudinal direction on the left and right sides of the tractor vehicle body 5. 13, and crossbar members 14, 15 for rigidly connecting at least one of the front, rear, and middle portions of the left and right side frame members 13 ,
100 and the front side of the left and right side frame members 13 to the tractor vehicle body 5
Front connecting mechanism 16 for connecting to the left and right side frame members 1
3 the rear side right and left of the tractor body 5 after axle case 18
Left and right rear side coupling mechanisms 12, which can be coupled to the front loader 6, a loader mounting mechanism 9 for mounting the front loader 6 and / or a working machine mounting mechanism 1 for mounting the rear working machine 7.
1 and the left and right side frame members 13 are
Are connected by the crossbar members 14, 15, 100
While it is integrated Te, so as to be detachably attached from the lower side to the tractor body 5, the front connecting mechanism 16, tractor
The motor vehicle body 5, attachment of sandwiching the tractor body 5 from left and right
It is, the rear connecting mechanism 12, via the holding means 17 for holding the rear axle case 18, set from below to the rear axle case 18
To be found .

As a result, the reinforcing frame structure 8 has the left and right frame members 13, the crossbar member, the front connecting mechanism 16, the rear connecting mechanism 12, the loader mounting mechanism 9 and / or the working machine mounting mechanism 11 and is integrated. The front part and the rear part thereof are easily attached to the tractor vehicle body 5 from below to support the load received from the front loader 6 and / or the rear working machine 7 and reduce the load applied to the tractor vehicle body 5.

In the third concrete means for solving the problems in the present invention, in addition to the first or second concrete means, each of the left and right side frame members 13 has a plate-shaped frame 130 extending rearward and upward. It is to have. This makes it easy to configure the rear connecting mechanism 12, the working machine mounting mechanism 11, and the like.

The fourth concrete means for solving the problems in the present invention is to install the engine 2 and the mission case 3 in the front and rear.
Direction and connect the front axle frame 4 from the engine 2.
Installed on the tractor body 5 installed,
For mounting the rear 6 and / or rear working machine 7 on the rear side
A reinforcing frame structure, which is provided on the left and right sides of the tractor body 5.
Left and right side frame members 13 extending along the longitudinal direction of the vehicle body,
At least of the front, rear, and midway portions of the left and right side frame members 13
A crossbar member that connects one place and a tractor on the front side
A front connecting mechanism 16 for connecting to the front part of the vehicle body 5, and a rear
Rear side connecting mechanism capable of connecting the rear side to the rear side of the tractor vehicle body 5
12 and a loader for mounting the front loader 6
The mounting mechanism 9 and / or the rear working machine 7 can be mounted.
And a working machine mounting mechanism 11 for the left and right side frames.
The member 13 is a plate-shaped frame 130 that extends backward and upward.
The frame 13 of each of the left and right side frame members 13
0 means that the rear axle 23 has a recess 135 that is fitted from below. As a result, the rear portion of the frame 130 is extended to the upper side, and the rear coupling mechanism 12, the working machine mounting mechanism 11 and the like are configured more firmly.

The fifth concrete means for solving the problems in the present invention is, in addition to the fourth concrete means, the left and right side frame members 13 are recessed portions 1 of the frame 130 fitted to the rear axle 23.
That is, it has a retaining member 140 that closes the opening side of 35 to retain the rear axle 23. Accordingly, even if the recess 135 is formed in the frame 130, the retaining member 14
0 prevents the strength from deteriorating and the retaining member 140
Can be used as a jig when the rear portion of the reinforcing frame structure 8 is mounted on the tractor vehicle body 5 from below.

The sixth concrete means for solving the problems in the present invention is, in addition to the first or second concrete means, that the crossbar member is located in the front, rear, and middle portions of the left and right frame members 13. At least the front portion is connected, and the front crossbar member 15 is formed of a pipe material that protrudes outward from the side frame member 13 to the left and right. As a result, the left and right side frame members 13 are connected to each other to reduce the weight, and the reinforcing frame structure 8 can be integrated, and the load applied to the reinforcing frame structure 8 is dispersed.

The seventh concrete means for solving the problems in the present invention is, in addition to the first or second concrete means, that the crossbar member is located in the front, rear, or middle portions of the left and right frame members 13. At least the rear portion is connected, and the rear crossbar member 14 is formed by a plurality of upper and lower rod members that connect the upper and lower portions of the rear portion of the left and right frame member 13, respectively.

This strengthens the rear portion of the reinforcing frame structure 8. Eighth Solution to Problems in the Present Invention
In addition to the first or second specific means, the crossbar member connects the rear portion or the middle portion of the left and right side frame members 13, and the front portion of each of the left and right side frame members 13 has a left and right side. It has a pipe material protruding in the direction.

As a result, the rear portion or the middle portion of the reinforcing frame structure 8 is made solid, and the front portion is made lightweight.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an overall view of a tractor front loader backhoe (TLB). A front loader 6 is connected to the front of the tractor body 5, and a backhoe 7 as an example of a rear working machine is connected to the rear of the tractor body 5.

The tractor vehicle body 5 is constructed by connecting the engine 2, the flywheel housing, the clutch housing, the transmission case 3, etc. in the front-rear direction. Further, a front axle frame 4 extends from the side surface of the engine 2 toward the front. Reference numeral 21 is a front wheel, 22 is a rear wheel, 2
3 is a rear axle, and 18 is a rear axle case.

At the rear of the tractor body 5, a rear axle case 18 extends from the mission case 3 to the left and right sides, and a rear axle 23 extends from the rear axle case 18 in the left-right direction of the vehicle body. Left and right rear wheel fenders 26 are attached to the rear axle case 18, and a driver's seat 27 is arranged on the tractor vehicle body 5 between the left and right rear wheel fenders 26.

The front loader 6 as a front working machine is
It is composed of a mast 28, a boom 29, a boom cylinder 30, a brace 31, a bucket 32 and the like. The backhoe 7 as a rear working machine includes a base 34, a mounting body 35 at the front thereof, a control unit 36 at the upper portion thereof, a swivel 37 pivotally supported at the rear of the base 34, and a swivel 37 via a horizontal axis. The boom 38 is pivotally supported, a bucket provided at the tip of the boom 38, an outrigger 40, and the like.

Reference numeral 41 indicates a rear column which constitutes a rear frame device, which is erected on the rear portion of the tractor vehicle body 5 and has a canopy 42 mounted on the upper portion thereof. A front portion of the canopy 42 is supported by a front support column 43 and a rear portion thereof is supported by a rear support column 41, and these constitute a sunshade device 44. The front support column 43 is connected to the mast 28 or the tractor body 5, and the rear support column 41 is connected to the rear portion of the reinforcing frame structure 8 described later.

Next, the reinforcing frame structure 8 will be described with reference to FIGS. As shown in FIGS. 1 and 2, the reinforcing frame structure 8 can mount the front loader 6 on the front side thereof and the rear working machine 7 on the rear side thereof. The reinforcing frame structure 8 is roughly divided into left and right frame members (here, square pipes) for forming a rectangular shape in a plan view.
13; a front crossbar member 15 that connects the left and right side frame members 13 in the vicinity thereof, and a rear crossbar member 14 that connects the left and right side frame members 13 in the rear part or in the vicinity thereof; a loader mounting mechanism 9 for mounting the front loader 6; It is configured by a working machine mounting mechanism 11 for mounting the rear working machine 7 on the rear part; a front side connecting mechanism 16 and a rear side connecting mechanism 12 for connecting the tractor vehicle body 5 and the reinforcing frame structure 8.

Next, the basic structure of the frame will be described with reference to FIGS. The left and right side frame members 13A and 13B are
There is a square pipe 13 extending along the side surface of the tractor vehicle body 5, and the front end portions thereof are connected by a front crossbar member 15. Further, a substantially triangular frame 130 extending rearward and upward is rigidly provided at the rear part of the right and left corner pipe 13, and the triangular frame 130 is provided at the rear end part of the left and right corner pipe by an L-shaped receiving member 131. It is rigidly connected.

The pair of left and right triangular frames 130 are connected by a rear crossbar member 14, and the rear crossbar member 14 has an upper first rear crossbar member 14U and a lower second rear crossbar member 14D. The rear crossbar members 14U and 14D are formed of rods such as rods or pipes, and three or more vertical positions of the left and right triangular frames 130 may be connected by rods.

The second rear crossbar member 14D is directly connected to the triangular frame 130, and the first rear crossbar member 14U is rearward of the receiving member 131.
A support plate 54 formed of a flat plate parallel to 30 is connected.
The front end of the support plate 54 is firmly connected to the receiving member 131 by welding or the like, and the triangular frame 130
The rigidity of is enhanced.

Next, the loader mounting mechanism 9 of the reinforcing frame structure 8 will be described with reference to FIGS. 2,
As is clear from FIG. 4, both ends of the front crossbar member 15 are formed with extensions 15A and 15B that extend the side surfaces of the left and right frame members 13 outward in the left-right direction. Here, a mast mounting bracket 91 that allows the mast 28 of the front loader 6 to be mounted is provided at the ends of the extension portions 15A and 15B, and a portion for mounting the mast 28 is formed. The extension portions 15A and 15B, the bracket 91 and the like constitute a loader mounting mechanism 9.

Next, the working machine mounting mechanism 11 of the reinforcing frame structure 8 will be described with reference to FIGS. A front mounting body 35 for connecting the backhoe working machine to the vehicle body is provided at an end of the backhoe 7 on the vehicle body side. As shown in FIG. 2, a connector 56 that can be opened and closed in the vertical direction is provided on the upper portion of the front attachment body 35, and a connecting pin 53 extending in the left-right direction is provided on the lower portion.

At the rear end side of the lower part of the triangular frame 130, a lower connecting body 52 having a recess 51 opening upward is provided, and an upper connecting pin (upper connecting member) connecting the supporting plate 54 and the triangular frame 130. ) 55 is provided. The work machine mounting mechanism 11 is configured by the recess 51, the upper connecting pin 55, and the like. The lower connecting pin 53 on the backhoe side is engageable with the recess 51 of the lower connecting body 52,
The attachment body 35 of the backhoe 7 is rotated around the lower connecting body 52 as a swing center to move the connecting tool 56 to the upper connecting pin 55.
By operating to sandwich it from above and below,
The backhoe 7 can be connected to the reinforcing frame structure 8.

As described above, the front loader 6 can be attached to the front of the reinforcing frame structure 8 and the backhoe 7 can be attached to the rear thereof. Next, the front side connecting mechanism 16 and the rear side connecting mechanism 12 for connecting the reinforcing frame structure 8 to the tractor vehicle body 5 will be described with reference to FIGS. First, the front connecting mechanism 16 includes the front crossbar member 15 of the reinforcing frame structure 8.
It has a pair of connecting arms 16 extending from the central portion 15C located inside the left and right side frame members 13 (In this embodiment, the front connecting mechanism and the pair of connecting arms are the same. Therefore, both are indicated by reference numeral 16.). The connecting arm 16 is rigidly connected and fixed to the crossbar member 15 by welding or the like, and extends along the side surface of the tractor vehicle body 5. As shown in FIGS.
It is connected to the front axle frame 4 or the engine 2 via a bolt penetrating (corresponding to the vehicle body side connecting portion).

The connecting arm 16 has a vehicle body side connecting portion 16a connected to the tractor vehicle body 5 at a front portion thereof and a reinforcing frame side connecting portion 16b connected to a front crossbar member 15 at a rear portion thereof, The arm portion 16c is formed between the vehicle body side connecting portion 16a and the reinforcing frame side connecting portion 16b. The arm portion 16c has a predetermined arm length,
As shown in the figure, its cross section is a flat plate shape, and is relatively elastically deformable with respect to the lateral force of the vehicle body.

Since the shape of the connecting arm 16 has high rigidity against the force in the direction of gravity, the mast mounting bracket 91
The force in the direction of gravity acting on is directly propagated to the tractor vehicle body 5 side and is supported by the front wheels 21. That is, the connecting arm 16 is configured to have a small elastic deformation amount with respect to a bending moment acting around the axis of the front crossbar member 15. However, since the connecting arm 16 has an arm length 16c of a predetermined length, when compared with a state in which the front crossbar member 15 of the reinforcing frame structure 8 is rigidly incorporated in the vehicle body 5, the bending moment against the bending moment is increased. The amount of elastic deformation is large.

When the masts 28 are attached to both ends of the front crossbar member 15, a force or various moments applied to each of the left and right masts 28 first causes the front crossbar member 15 to be twisted or deformed. A predetermined proportion of the strain energy is absorbed by the bending deformation, and the arm portion 1
The strain energy is further absorbed by elastically deforming 6c in a predetermined direction, so that the force or moment transmitted to the tractor vehicle body 5 side is further reduced.

Regarding the cross-sectional shape of the arm portion 16c of the connecting arm 16, as is clear from FIGS. 4 and 5, a cross-section based on the vertical axis v that passes through the center of the connecting arm 16 in the thickness h direction in the vertical direction. The coefficient Z1 is set to be much smaller than the section coefficient Z2 with reference to the horizontal axis s that horizontally passes through the center of the connecting arm 16 in the width b direction.

The relationship is illustrated below with reference to FIG. 5b. Z1 = bh ² /6-(1) Z2 = hb ² /6-(2) Z2> Z1 × N where Z1 is the cross-sectional coefficient with respect to the vertical axis v passing through the thickness h central portion of the connecting arm 16 in the h direction. , Z2 is a section coefficient with respect to the horizontal axis s passing through the width b central portion of the connecting arm 16, and N is a constant.

The section modulus Z1 with respect to the vertical axis v of the connecting arm 16 is defined by the left and right side frame members (pipes) 1.
3 is set to a smaller value than the smaller function (MIN) of the section modulus Z3 with respect to the corresponding vertical axis v1 of 3 or the section modulus Z4 of the front crossbar member 15 with respect to the corresponding vertical axis v2. It should be. The relationship of each section modulus is illustrated below.

Z1 <(1 / N) × MIN (Z3: Z4)-(3) Here, Z3 is a section modulus with respect to the vertical axis v1 of the side frame member (pipe) 13, and Z4 is a front cross. Section coefficient based on the vertical axis v2 of the bar member 15, N is a constant, MI
N (:) is a function that selects the smaller one in parentheses. In the above formula (3), N is appropriately selected so as to facilitate the deformation of the connecting arm 16 against the lateral force. As described above, the cross-sectional shape of the connecting arm 16 should be set so that the elastic deformation amount increases with respect to the force in the specific direction, and the shape needs to be a quadrangle as shown in FIGS. There is no.

It should be noted that a structure in which the elastic deformation amount for a force in a specific direction is intentionally set to be much larger than the elastic deformation amount for the other force, or no reaction force is applied to a force component in a specific direction. The structure that does not occur is defined as a free (selective) structure. Here, the connecting arm 16 is configured as a free structure, and the connection state between the connecting arm 16 and the tractor vehicle body side is referred to as free connection.

Next, the rear side connecting mechanism 12 of the reinforcing frame structure 8 has a recess 135 (or U-shaped opening) which is formed in the receiving member 131 and the triangular frame 130 and opens upward as a basic constituent element. The holder 17a shown in FIGS. 6 and 7 is added to support the rear axle case 18 of the tractor vehicle body 5. The holding means 17 is configured by the holder 17a, the receiving member 131, and the like.

As shown in FIGS. 6 and 7a, the triangular frame 1
A recess 135 is formed in the housing 30 so as to accommodate the rear axle 23 extending from the end of the rear axle case 18.
With the rear axle 23 fitted in the concave portion 135 of the triangular frame, the rear axle case 18 has a holder 17a abutted from above, a bolt 171 and a nut 172 for attaching the holder 17a to the receiving member 131, and the like. Is fixed to the receiving member 131 using.

In particular, as shown in FIGS. 7a and 7b, a predetermined gap is formed between the groove width of the peripheral groove portion 173 formed on the outer periphery of the rear axle case 18 and the outer diameter of the bolt 171. With the holder 17a attached to the receiving member 131, the rear axle case 18 is configured to allow lateral displacement of the rear axle case 18 within a predetermined range. As shown in FIG. 7c, the triangular frame 130 and the rear axle case 18 are provided by providing the spherical bearing 19 and the like on the inner circumference of the holder 17a.
It is also possible to increase the degree of freedom of displacement relative to. However, in this case, it is necessary to previously fit and mount the spherical bearing body 19 in the rear axle case 18 in the axial direction, and it is preferable that the holder 17a is also formed of an annular member.

By attaching the retaining plate 140 shown in FIG. 6 to the triangular frame 130 with the rear axle case 18 fixed to the rear connecting mechanism 12 as described above, the rear axle case 18 and the reinforcing frame structure pair. The connection state with 8 is made more reliable. When connecting the retaining plate 140 to the triangular frame 130, the plurality of fixing holes 137 formed in the retaining plate 140 and the screw holes 139 formed in the triangular frame 130 are fitted to each other as shown in FIG. (Not shown) can be stopped.

Here, in the state where the holder 17a is fixed to the receiving member 131 with bolts or the like, the vertical distance between the holder 17a and the receiving member 131 is slightly larger than the size of the rear axle case 18 held in this space. It is also possible to fit a spacer or the like on the outer periphery of the bolt 171 so that Further, in order to fill the gap formed between the upper limit portion of the rear axle case 18 and the lower surface of the holder 17a, it is possible to interpose an elastic member on the lower surface of the holder 17a so as to absorb vibrations and the like due to this gap. it can.

According to this structure, most of the twisting moment of the triangular frame 130 about the rear axle by the rear working machine (backhoe) 7 is absorbed by the relative rotational displacement between the rear axle case 18 and the holder 17a. Therefore, this twisting moment is propagated to the tractor vehicle body 5 side in a considerably relaxed state. As shown in FIG. 3, the above-mentioned reinforcing frame structure 8 can be connected to the tractor vehicle body 5 by the front connecting mechanism 16 and the rear connecting mechanism 12. Here, the width of the pair of connecting arms 16 as the front side connecting mechanism 16 through the inner side surface is formed to be slightly wider than the outer width of the front axle frame 4, and the recess 135 of the triangular frame 130 is opened upward. Therefore, the reinforcing frame structure 8 can be mounted from below the tractor vehicle body 5 as a completed vehicle in the assembled state.

As is particularly clear from FIGS. 1 and 2, it is very easy to access the bolt hole 16a of the connecting arm 16 as the front connecting mechanism of the reinforcing frame 8 so as to sandwich it from the side of the tractor body 5. Since it is easy, it can be easily assembled to the tractor body. The rear coupling mechanism 12 accommodates the rear axle 23 inside the rear wheel 22 of the tractor vehicle body 5 in the recess 135 during the assembling work, and as shown in FIG.
Since a work of fixing 7a is required, a simple mechanism that can quickly and temporarily fix the rear axle case 18 to the triangular frame 130 may be provided.

As such a temporary fixing mechanism, one end of the retaining plate 140 is rotatably connected to the triangular frame 130, and the rear portion of the reinforcing frame structure 8 is lifted to form the recess 135 in the rear axle. 23, and then fix both ends of the retaining plate 140 to the triangular frame 130,
It is conceivable to fix the holder 17a to the receiving member 131 with the retaining plate 140 supporting the rear portion of the reinforcing frame structure 8.

Next, the absorption of strain energy generated by the work of the front loader will be described. That is, when the reinforcement frame structure 8 is connected to the tractor vehicle body 5 and stress is generated in the mast 28 by the work of the front loader 6, what is the force (that is, the strain energy due to the force)? First, how to be absorbed by the reinforcing frame structure 8 or propagated to the tractor vehicle body 5 will be described.

For example, as an example of the force generated in the mast 28, the case where a counterclockwise force is generated in the upper end portion of the mast 28 in FIGS. By this power,
A counterclockwise bending moment is generated in the mast mounting bracket 91 of the reinforcing frame structure 8, and this bending moment twists the front crossbar member 15 in the counterclockwise direction. Although it occurs, this twisting deformation is restricted by the square pipe 13 and the connecting arm 16.

In other words, the mast mounting bracket 91
The bending moment generated on the front crossbar member 15 is
Due to the twist deformation, the deformation of the square pipe 13, and the deformation of the connecting arm 16, a considerable part thereof is absorbed. Thus, a part of the bending moment is absorbed by the torsional deformation of the front crossbar member 15 and further causes the elastic deformation of the square pipe 13, so that the portion propagated to the connecting arm 16 is already reduced at this point. Will be.

Further, since the connecting arm 16 has the predetermined arm length 16c as described above, the vehicle body mounting portion 16a
However, even if the bending moment is propagated to, a part of the bending moment is absorbed due to the elastic deformation of the connecting arm 16 caused by the arm length. Therefore, when the front crossbar member 15 is directly connected to the tractor vehicle body 5, the bending moment propagated to the vehicle body 5 is much reduced in the case where this connection structure is adopted. Then, the power of the front loader during work can be increased without increasing the strength of the tractor vehicle body 5.

In the present invention, the connecting arm 16 may be directly connected by bolts or the like so as to be sandwiched between the left and right sides of the tractor body 5 such as the lower side surface of the engine 2. However, when the connecting arm 16 is connected to the front axle frame 4 as shown in FIGS. 1 to 3, since the front axle frame 4 can be further elastically deformed, the bending moment and the force (stress) transmitted to the tractor vehicle body 5 are increased. It is possible to reduce the size of.

However, since the shape of the connecting arm 16 is extremely strong in the vertical direction, most of the force component in the direction of gravity generated by mounting the front loader 6 is received by the front wheel 21. However, with respect to the force in the gravitational direction, the pair of front wheels 21 and the pair of rear wheels 22, and the work machine of the backhoe are outriggers 40 in the ground contact state.
Therefore, no matter how the rigidity of the reinforcing frame structure 8 is increased, the absolute value of the force to be supported by these members does not decrease.

Furthermore, since the rear end portion of the square pipe 13 is connected in a loop by the rear crossbar member 14, the bending stress is very rarely propagated to the rear end portion of the tractor vehicle body 5. Most of the bending stress generated in the mast mounting bracket 91 is absorbed as strain energy by elastic deformation of each member of the reinforcing frame structure 8 as described above, and thus the absolute value of the stress transmitted to the tractor vehicle body 5 is reduced. It becomes possible. In this way, it becomes possible to increase the upper limit of the power of the work machine in the work of the front loader.

Next, by mounting the reinforcing frame structure 8 of the present invention on the tractor vehicle body 5, how the strain energy generated by the rear working machine 7 is absorbed and the work output can be increased. explain. Here, referring to FIG. 8 again, the bending stress (corresponding to Fx2) around the lower connecting body 52 around the axle is the upper connecting pin 55 (or the bending moment centering on the upper connecting pin 55 is the lower part). Description will be given assuming a case where it acts on the connector 52).

When such a bending moment acts, the triangular frame 13 with respect to the moment in this direction.
Due to the high rigidity of 0, the strain energy is not directly absorbed by the triangular frame 130 but is directly propagated to the front end of the triangular frame 130 where it is connected to the square pipe 13. The bending stress generated at the ends causes the square pipe 13 to elastically deform.

However, since the rear axle case 18 is allowed to rotate with respect to the triangular frame 130 as described with reference to FIG. 6, the bending moment is substantially the same as that of the rear axle case 1.
8 will not be transmitted. Therefore, the triangular frame 13
When compared with the structure in which the 0 or left and right frame members (square pipe 13) are directly connected to the rear axle case 18, most of such bending moment can be absorbed by assembling the reinforcing frame structure 8. Almost no twisting force is transmitted to the tractor body 5. Therefore, the work output of the backhoe 7 corresponding to this type of moment can be increased.

Furthermore, when a force (corresponding to Fy2) in the axle direction is generated in the working machine mounting mechanism 11 of the triangular frame 130, the rear axle case 18 is connected to the rear side coupling mechanism 12.
If the triangular frame 130 can be displaced in the axle direction within the set range, the force in this direction is not directly transmitted to the rear axle case 18. As mentioned above,
As shown in FIG. 8, the front loader 6 and the backhoe 7
Although it is relatively easy to explain the state of absorption of strain energy of the reinforcing frame structure 8 with respect to the force component in a specific direction transmitted from and the bending moment, in actual work, more complicated force may be applied to the mast. It is considered to act on the bracket 91, the triangular frame 130 and the like. However, when any force acts on the mast mounting bracket 91, the force is applied in three directions (x direction, y direction, z direction: as shown in FIG. 8, the traveling direction of the vehicle body is the x direction; the axle direction is the y direction. Direction; a force component (Fx; Fy; Fz) of the vehicle body above the z direction) and a moment about three axes (a moment Mx about the x axis, a moment M about the y axis)
It is possible to decompose the force components (Fx1, Fy2, Fz3) into a certain ratio by elastic deformation due to bending of the front crossbar member 15, and a certain ratio is absorbed. Therefore, these force components transmitted to the tractor vehicle body 5 are reduced.

Supplementally, since Mx1 acts as a bending force of the front crossbar member 15 in the x-axis direction, it causes elastic deformation of the front crossbar member 15 in the x-axis direction. Since it also acts as a force to pull or compress the pipe 13), the left and right frame members 13 are elastically deformed in the x-axis direction. Since Fy1 acts as a pulling or compressing force of the front crossbar member 15 in the y-axis direction, it causes elastic deformation of the front crossbar member 15 in the y-axis direction, and further, the left and right side frame members 13 are moved in the y-axis direction. Since it also acts as a deforming force, it causes elastic deformation of the left and right side frame members 13. Similarly, Fz1 is the front crossbar member 1
5 is deformed in the z-axis direction, and x of the left and right frame members 13 is further deformed.
It acts as a force that causes axial deformation.

Bending moment components (Mx1, My2,
With respect to Mz3), a certain ratio is absorbed by the twist deformation of the front crossbar member 15 or the twist deformation of the mast mounting bracket 91 itself around the y-axis.
It is possible to reduce the magnitude of the moment propagated to. Supplementally, Mx1 is the front crossbar member 1
5 acts as a bending force in the z-axis direction, which causes elastic deformation of the front crossbar member 15 in the z-axis direction.
Since the left-right frame member 13 acts as a resistance against elastic deformation of the front crossbar member 15, strain energy generated by the moment by both the front crossbar member 15 and the left and right side frame members 13 is applied to Mx1. Partly absorbed.

Since My1 acts as a twisting torque of the front crossbar member 15 about the y-axis, it causes twisting deformation of the front crossbar member 15 about the y-axis, and the left and right side frame members 13 also twist and deform. The strain energy resulting from the moment is partially absorbed by the crossbar member and the left and right side frame members 13 as well. Similarly, Mz1 deforms the front crossbar member 15 in the x-axis direction, and the left and right side frame members 13 act so as to prevent the deformation. Therefore, the strain energy caused by the moment is partially absorbed. It is absorbed by the front crossbar member 15 and the left and right side frame members 13.

The directions of the arrows relating to Fx, Fy, Fz and Mx, My, Mz shown here are incidental to the description, and depending on the actual force, one of the components acts in the opposite direction. In some cases. Similar analysis can be performed on the force components (Fx2, Fy2, Fz2) acting on the upper connecting pin 55 and the lower connecting body 52 of the work implement mounting mechanism 11.

For example, Fx2 acts as a bending stress acting on the ends of the left and right frame members 13, and the force component causes the left and right frame members 13 to elastically deform, so that the strain energy corresponding to the elastic deformation amount is This is the ratio of strain energy that can be absorbed by the reinforcing frame structure 8. Similarly, the force component of Fy2 acts as a twisting moment acting on the rear end of the left and right frame member 13, but the component force is also twisted and deformed by the left and right frame members 13. It is possible to absorb a certain proportion of the components. Furthermore, regarding Fz2 as well, a certain proportion of strain energy can be absorbed by elastic deformation of the left and right frame members 13.

Various components of bending moment (Mx2, My
2, Mz2), the triangular frame 130, the rear crossbar members 14U and 14D, and the left and right frame members 13 are elastically deformed so that a predetermined proportion of moment is absorbed by the reinforcing frame structure 8. For example, with respect to My2, since the connecting tool 56 of the backhoe 7 only sandwiches the upper connecting pin 55, and a static force acts only by sliding friction, it is substantially My2 when compared with other moment components. It is considered that the resulting reaction force or moment received by the tractor vehicle body 5 is at a negligible level.

For the moment component of Mz2,
Substantially most of the rear crossbar members 14U and 1
It is absorbed by the bending deformation of 4D and the deformation of the triangular frame 130. Furthermore, regarding My2, triangular frame 1
A predetermined ratio is absorbed by elastic deformation of 30 and bending deformation of the left and right frame members 13. Regarding the components of these bending moments, the rear axle case 18 has the triangular frame 13
The fact that the tractor body 5 can be displaced in the axial direction within a predetermined range with respect to 0 and can be rotated,
Will have a smaller effect on.

The same analysis as described above can be performed on the force components in the three directions acting on the lower connecting body 52 and the moment components around the three axes. In the above-mentioned reinforcing frame structure 8, a complete loop-shaped frame structure is disclosed by the left and right side frame members 13, the rear crossbar member 14 and the front crossbar member 15. However, as shown in FIG. The crossbar member 15 is omitted, and a loader is provided from the front ends of the left and right side frame members 13 to a connecting arm 16B as a front side connecting mechanism and an extension part extending from the front end portions of the left and right side frame members 13 leftward and rightward. Mast mounting bracket 91B as a mounting device
You may employ | adopt the structure provided with.

When this reinforcing frame structure 8B is adopted,
Compared to the above-mentioned reinforcing frame structure 8, the amount of strain energy absorbed due to the force transmitted from the front loader 6 is reduced due to the absence of the front crossbar member 15, and more force components or moments are obtained. It is expected that the components will be propagated to the tractor vehicle body 5, but these can be alleviated to some extent by increasing the rigidity of the left and right side frame members 13.

That is, since the force component Fx3 acts as a compressive force or a tensile force of the left and right side frame members 13, the left and right side frame members 13 can be deformed in the axial direction by a predetermined amount. This elastic deformation absorbs part of the strain energy caused by Fx3, so that this force component is not directly propagated to the tractor vehicle body 5. further,
Regarding the force component Fy3, the force component Fy3 acts as a force to bend the left and right side frame members 13 outward or laterally inward, and the deformation of the left and right side frame members 13 and the elastic deformation of the connecting arm 6B cause F
Since part of the strain energy due to y3 is absorbed,
This force component is not directly transmitted to the tractor vehicle body 5.

Further, the elastic deformation of the rear wheel 22 absorbs a considerable part of the strain energy caused by Fz3. Regarding the moment component Mx3, a considerable part of the strain energy due to the moment is absorbed by elastically deforming the connecting arm 16 in the axial direction.

With regard to My3, the elastic deformation of the member is propagated to the connecting arm 16B in a relatively small state, and elastic bending of the connecting arm 16B with respect to this moment about the axis cannot be expected so much, but this bending moment component M
The strain energy generated in the front axle frame 4 due to y3 is substantially absorbed mainly by the elastic deformation of the tires of the front wheels 21, so that the substantial load on the tractor vehicle body 5 is not a serious problem.

With respect to Mz3, since the connecting arm 16B can be deformed in the axial direction, the amount of deformation is the absorption of the strain energy due to the moment by the reinforcing frame structure 8B. The amount propagated to 5 is reduced. Since the rear mounting mechanism 11 is substantially the same as the reinforcing frame structure 8, the force component and the moment component due to the backhoe 7 reduce their values in the same manner as described above, and propagate to the tractor body 5.

As another embodiment 8C of the reinforcing frame structure, the rear crossbar member 14 can be omitted as shown in FIG. In this case, the force component Fx
4, Fz4 is propagated to the tractor vehicle body 5 with its absolute value reduced because it is caused by elastic deformation of the square pipe 13 that deforms in the z-axis direction in the xz plane of the triangular frame 130. However, with respect to the force component Fy4, by omitting the rear crossbar member 14, it is no longer possible to expect absorption of force due to compressive deformation and tensile deformation of the member.

Therefore, when this structure is used, the strain energy of the reinforcing frame structure 8C can be expected to be absorbed especially with respect to Fy4. Therefore, the force to be supported by the tractor vehicle body 5 is its absolute value (Fx ² + Fy ² + Fz). ² ) If you think about ^1/2 , it will be reduced. Similarly, the bending moment component Mx4 is considered to contribute to the deformation of the left and right side frame members 13 in the axle direction. That is, this moment component Mx
No. 4 can reduce the transmission to the tractor vehicle body 5 by the rear crossbar member 14, but since the rear crossbar member is omitted as in the present embodiment, this moment component can be transmitted to the tractor vehicle body 5. I can't be disturbed.
However, as described in the above force component, when considered as a complex of moments, the absorption of the energy of the My component and Mz component can be expected, so that the distortion caused by the moment to be supported by the tractor vehicle body 5 is considered in total. Energy is reduced.

In this way, the specific force component and the specific moment component have to be directly received by the tractor body 5 by omitting the rear crossbar member, but other force components. Further, since the component can be effectively absorbed with respect to the moment, when viewed as the entire reinforcing frame structure 8C, it is understood that the structure of the present embodiment is a structure that can sufficiently power up the working machine.

In addition to the above-described embodiment, as shown in FIG. 13, the reinforcing frame structure 8D is constructed by connecting the vicinity of the middle of the left and right side frame members 13 in the longitudinal direction with the intermediate crossbar member 100. Is also possible. The triangular frame 130, which is a common component of the left and right side frame members 13 and the rear side connecting mechanism 12, does not have the concave portion 135, and has an L shape as shown in FIG.
The frame 130A of the mold and the corresponding holder 17
It is also possible that A has a U shape with a downward opening.

With respect to the connecting arm 16 as the front connecting portion, the vehicle body side connecting portion 16a is disclosed in a state in which a plurality of bolt holes are simply formed. However, as another form of the vehicle body side connecting portion, as shown in FIG. 10, a circular opening portion 16d is formed in the connecting arm 16, and a corresponding opening portion 16d 'is also formed in the front axle frame 4 by being threaded. Then, the opening 16d and the opening 16d 'are matched to each other, and the cylindrical screw member 16 is formed.
It is also possible to connect by d ".

With this structure, the connecting arm 16 can be configured to be rotatable around the y-axis with respect to the tractor vehicle body 5, and the reinforcing frame structure 8 and the vehicle body 5 can be arranged.
It is possible to provide a further degree of freedom in the connected state with. The present invention is not limited to the above-mentioned embodiment, but can be modified in various ways. For example, although the cross-sectional shape of the front and rear crossbar members 14 and 15 is circular, the cross-sectional shape is not limited to circular and may be square or elliptical. Pair of connecting arms 1
Although the state where 6 extends from the front crossbar member 15 is disclosed, it is also possible to change the shape of the pair of connecting arms 16 so as to extend from the vicinity of the front ends of the left and right side frame members 13.

The absorption of strain energy due to elastic deformation of the left and right side frame members 13 has been described. This is based on the following Castigliano's method: Δ = dU / dQ The tractor body 5 combines the loads. When elastically flexed by, the flexure is at any position and in any direction and is equal to the partial derivative of the strain energy with respect to the load acting in that position (calculated by all acting loads) .

By mounting the reinforcing frame structure 8 on the ordinary agricultural tractor in this manner, the front loader 6 and the working machine such as the back hoe 7 can be attached to the front side and the rear side to perform the work. Since the reinforcing frame structure 8 absorbs a part of the strain energy generated by the work of the front loader 6, the load on the tractor vehicle body 5 is reduced, and the front loader 6 or It is possible to increase the output during work by the backhoe 7.

The structure of the reinforcing frame structure 8 described above is summarized as follows. The engine 2 and the transmission case 3 are connected to each other in the front-rear direction, and the front axle frame 4 is attached to the tractor vehicle body 5 extending from the engine 2, and the front loader 6 on the front side and the rear working machine 7 on the rear side are mounted, or the front. Only one of the loader 6 and the rear working machine 7 is mounted.

A left and right side frame member 13 extending along the longitudinal direction of the tractor vehicle body 5 on the left and right sides, and a cross connecting at least one of front, rear, and midway portions of the left and right side frame member 13. A bar member, a front side connecting mechanism 16 for connecting the front side to the front part of the tractor body 5, a rear side connecting mechanism 12 for connecting the rear side to the rear part of the tractor body 5, and a front loader 6 can be mounted. And / or a working machine mounting mechanism 11 for mounting the rear working machine 7.

The crossbar member that connects at least one of the front, rear, and midway portions of the left and right side frame members 13 can be in a rigid connection state, or can be a flexible connection state using a plate material. . The front connecting mechanism 16 is mounted by sandwiching the tractor vehicle body 5 from the left and right, and the rear connecting mechanism 12 mounts the rear portion of the left and right side frame members 13 from below to hold the rear axle case 18. The reinforcing frame structure 8 can be detachably attached to the tractor body 5 from below.

Each of the left and right side frame members 13 has a plate-shaped frame 130 extending rearward and upward.
Has a recess 135 that fits into the rear axle 23 from below, and has a retaining member 140 that closes the opening side of the recess 135 that fits into the rear axle 23 to retain the rear axle 23. When the crossbar member connects at least the front part of the front, rear, and midway parts of the left and right side frame members 13, the front crossbar member 15 is formed of a pipe material protruding outward from the side frame member 13 to the left and right. However, when connecting at least the rear part of the front, rear, and middle parts of the left and right side frame members 13, the rear crossbar member 14 is connected to the upper and lower parts of the rear part of the left and right side frame members 13 respectively. When the cross bar member connects the rear part or the middle part of the left and right side frame members 13 with a rod member, the left and right side frame members 13 each have a pipe member protruding in the left and right direction at the front part.

The loader mounting mechanism 9 has a portion (mast mounting bracket 91) for protruding the mast 28 of the front loader 6 from the tractor vehicle body 5 to the outside on the left and right, and from the front of the left and right side frame members 13. It is provided on the member protruding left and right. The front side connecting mechanism 16 is a pair of left and right connecting arms that protrudes forward from the pipe material and is attached by sandwiching the engine 2 from both left and right sides. The left and right connecting arms are vertical directions that act on the end portions of the connecting arms in the left and right direction of the tractor vehicle body. When the first elastic deformation amount with respect to the first load is compared with the second elastic deformation amount with respect to the vertical second load acting on the end portion of the connecting arm in the virtual plane parallel to the cross section of the pipe material, It is set so as to satisfy the formula of 1 elastic deformation amount <N × second elastic deformation amount. However, N = 2, the magnitude of the first vertical load = the magnitude of the second vertical load.

Further, each of the left and right connecting arms has a tractor body side connecting portion 16a, a pipe material side connecting portion 16b and an arm portion 16c in the middle thereof, and the sectional shape of the arm portion 16c is the first section coefficient <the first section coefficient. 2 Section modulus / N is set so as to satisfy the equation. However, N = 2, the first section coefficient = the section coefficient of the arm portion 16c based on the vertical axis v that passes vertically through the section center of the connecting arm, and the second section coefficient = the section center of the connecting arm in the horizontal direction. It is a section modulus of the arm portion 16c with respect to the horizontal axis s passing therethrough.

Further, each of the left and right connecting arms has a tractor vehicle body side connecting portion 16a, a pipe material side connecting portion 16b and an arm portion 16c in the middle thereof, and the tractor vehicle body traveling direction is indicated by X.
When the axial direction, the tractor vehicle body transverse direction is the Y axis direction, and the tractor vehicle body upward direction is the Z axis direction, the arm portion 16c extends substantially in the XZ plane. The working machine mounting mechanism 11 is positioned so as to project rearward from the rear coupling mechanism 12, is positioned rearwardly protruding from the rear coupling mechanism 12, and has a pair of upper and lower coupling members on the left and right.

The rear connecting mechanism 12 has a frame 130 provided at the rear portion of each of the left and right side frame members 13.
0, the holding means 17 is attached to the frame 130, the holding means 17 is fixed to the frame 130, and the receiving member 131 is located below the rear axle case 18, and the receiving member 131 is detachably fixed to the receiving member 131. A holder 17a for holding the rear axle case 18 with respect to the holder 17a
Is fixed to the receiving member 131 by coming into contact with the rear axle case 18 from above, or fixed to the receiving member 131 while being fitted in the rear axle case 18 in the axial direction.

The holding means 17 can be configured to be displaceable with respect to the rear axle case 18 in the left-right direction of the tractor vehicle body within a predetermined range. The working machine mounting mechanism 11 is
The frame 130 includes a pair of left and right lower connecting members 52 provided in the lower rear portion of the frame 130 and having a recess 51 that is open upward, and a pair of left and right upper connecting members 55 provided in the upper rear portion.

The above-described embodiment shows the features of the present invention to some extent, and the structure, the combination of parts, and the arrangement can be variously changed, and only one of the front loader 6 and the backhoe 7 may be used.

[0095]

The reinforcing frame structure 8 of the present invention described in detail above.
Has the following effects. According to claim 1, the left and right side frame member 13, a cross bar member, the front connecting mechanism 16, the rear connecting mechanism 12 and the loader attachment mechanism 9及beauty work industry machine mounting mechanism 11 can be a one piece, handle Becomes easier,
Mounting becomes easy for the tractor body 5, front loader 6 or supports a load applied from the rear working machine 7, it is possible to reduce the load applied to the tractor body 5.

According to the second aspect, the left and right frame members 13, the crossbar member, the front connecting mechanism 16, the rear connecting mechanism 12, the loader mounting mechanism 9 and / or the working machine mounting mechanism 11 are integrated into one body. The front part and the rear part thereof can be easily attached to the tractor vehicle body 5 from below, support the load received from the front loader 6 and / or the rear working machine 7, and reduce the load applied to the tractor vehicle body 5. can do.

According to the third aspect, the rear side connecting mechanism 12, the working machine mounting mechanism 11 and the like can be easily constituted by the frames 130 of the left and right side frame members 13. According to the fourth aspect, the rear portion of the frame 130 can be extended to the upper side, and the rear coupling mechanism 12, the working machine mounting mechanism 11 and the like can be configured more firmly. According to claim 5, the frame 13
Even if the concave portion 135 is formed in 0, strength reduction can be prevented by the retaining member 140, and the retaining member 140 is used as a jig when the rear portion of the reinforcing frame structure 8 is mounted to the tractor vehicle body 5 from below. it can.

According to the sixth aspect, the reinforcing frame structure 8 can be integrated while connecting the left and right frame members 13 to reduce the weight, and the load applied to the reinforcing frame structure 8 can be dispersed. According to claim 7, the rear portion of the reinforcing frame structure 8 can be made strong. According to claim 8, the rear portion or the middle portion of the reinforcing frame structure 8 can be made strong, and the weight of the front portion can be reduced.

[Brief description of drawings]

FIG. 1 is an overall side view showing an embodiment of the present invention.

FIG. 2 is a side view of the main part.

FIG. 3 is a plan view showing a relationship between a tractor vehicle body and a reinforcing frame structure.

FIG. 4 is a side perspective view of a reinforcing frame structure.

FIG. 5 (a) is a front perspective view of a reinforcing frame structure,
(B) is sectional drawing of the connection arm as a front side connection mechanism of a reinforcement frame structure.

FIG. 6 is a side view showing a connected state of a rear portion of the reinforcing frame structure and an axle case.

7A is a sectional view taken along line XX of FIG. 6, and FIG.
FIG. 7 is a partially enlarged view of (a), and (c) is a view showing another form of connection between the rear portion of the reinforcing frame structure and the axle case.

FIG. 8 is an explanatory diagram that schematically shows the states of forces and moments that occur in the reinforcing frame structure.

FIG. 9 is a perspective view showing another form of the holder of the rear coupling mechanism of the reinforcing frame structure.

FIG. 10 is an exploded perspective view showing another form of the front connecting mechanism of the reinforcing frame structure.

FIG. 11 is a perspective view showing a reinforcing frame structure having only a rear crossbar member.

FIG. 12 is a perspective view showing a reinforcing frame structure having only a front crossbar member.

FIG. 13 is a perspective view showing a reinforcing frame structure having only an intermediate crossbar member.

[Explanation of symbols]

2 engine 3 mission case 4 front axle frame 5 tractor body 6 Front loader 7 Backhoe (post-working machine) 8 Reinforcement frame structure 9 Loader mounting device 11 Working machine mounting mechanism 12 Rear connection mechanism 13 Side frame member (square pipe) 14 Rear crossbar member 15 Front crossbar member 16 Front side connection mechanism (connection arm) 17 Holding means 17a holder 18 rear axle case 23 rear axle 130 frames (triangular frame) 131 Receiving member 135 recess

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-6-32189 (JP, A) JP-A-5-287772 (JP, A) Actual exploitation Sho 51-122006 (JP, U) (58) Field (Int.Cl. ⁷ , DB name) B62D 21/18 B62D 49/00 E02F 9/16

Claims (8)

(57) [Claims] 1. A front part of a front side of a front part of a tractor body (5), wherein an engine (2) and a transmission case (3) are connected to each other in a front-rear direction and a front axle frame (4) is extended from the engine (2). loader (6) the reinforcing frame structure for及beauty rear side after the working machine (7) is mounted, left and right side of extending along the longitudinal direction of the car body at the left and right side of the tractor body (5) The frame member (13) and a crossbar member (14, 15, 100) that connects at least one of the front, rear, and middle portions of the left and right frame members (13), and the left and right
A front side connecting mechanism (16) for connecting the front side of the side frame member (13) to the front side of the tractor vehicle body (5), and left and right side frame parts
A rear connecting mechanism (12) capable of connecting the rear side of the material (13) to the rear part of the tractor vehicle body (5), and a front loader (6).
Loader attachment mechanism for enabling mounting (9)及beauty after work <br/> industry machines (7) working machine mounting mechanism for enabling mounting of (1
1) and the left and right side frame members (13) are crossbar members (14, 15,
100) is connected and integrated into a front side coupling machine.
Connected by the structure (16) and the rear side connecting mechanism (12).
The front connecting mechanism (16) is removed from the front loader (6).
The load that propagates to the tractor body (5) side is elastically deformed.
The rear connecting mechanism (12) can be absorbed by the rear working machine (7) from the tractor.
The load propagating to the vehicle body (5) side is applied to the tractor vehicle body (5).
A reinforcing frame structure for a tractor, which is capable of being absorbed by a relative displacement with respect to the tractor. 2. A front part of a front side of a tractor body (5), which connects an engine (2) and a transmission case (3) in a front-rear direction and which has a front axle frame (4) extending from the engine (2). A reinforcing frame structure for mounting a loader (6) and / or a rear side rear working machine (7), the left and right sides of the tractor body (5) extending along the vehicle body longitudinal direction. A crossbar member (14, 15, 100) rigidly connecting the frame member (13) and at least one of the front, rear, and middle portions of the left and right frame members (13 ).
When a front connecting mechanism for connecting the front side of the left and right side frame members (13) to the tractor body (5) (16), left and right
The rear side of the side frame member (13) is located on the left and right of the tractor vehicle body (5).
Left and right rear connecting mechanisms (12) connectable to the rear axle case (18), a loader mounting mechanism (9) for mounting the front loader (6), and / or a rear working machine (7).
And a working machine mounting mechanism (11) for mounting the left and right side frame members (13).
Connected by loss bar members (14, 15, 100)
Front coupling mechanism (16) so that the tractor body (5) can be detachably mounted from the lower side in the integrated state.
Is the tractor body (5), is mounted across the tractor body (5) from the left and right, rear connecting mechanism (12), through the holding means for holding the rear axle case (18) (17)
And a reinforcing frame structure for a tractor, which is assembled to the rear axle case (18) from below . 3. The tractor reinforcement frame structure according to claim 1, wherein each of the left and right side frame members (13) has a plate-shaped frame (130) extending rearward and upward. body. 4. An engine (2) and a mission case
(3) is connected in the front-rear direction and from the engine (2) in front of the vehicle.
Install the shaft frame (4) on the extended tractor body (5).
Front, front loader (6) and / or rear side
It is a reinforcing frame structure for mounting the rear working machine (7).
Te, along the longitudinal direction of the car body at the left and right side of the tractor body (5)
Left and right side frame members (13) and the left and right side frame members
At least one of the front, rear, and midway of (13)
The crossbar member to be connected and the front side of the tractor body (5)
Front coupling mechanism (16) for coupling to the front part of the
Rear coupling machine that can be coupled to the rear of the tractor body (5)
The structure (12) and the front loader (6) can be mounted.
Loading mechanism (9) and / or post-working machine (7) for
Equipped with a working machine mounting mechanism (11) for enabling mounting
The left and right side frame members (13) are moved backward and upward.
The frame (130) of each of the left and right side frame members (13) has a plate-shaped frame (130) that extends and has a recess (135) that fits into the rear axle (23) from below. A reinforcing frame structure for a tractor, which has. 5. The left and right side frame members (13) are provided on the rear axle (2).
5. A retaining member (140) for retaining the rear axle (23) by blocking the opening side of the recessed portion (135) of the frame (130) fitted in 3). Reinforcement frame structure of the tractor described in. 6. The crossbar member is a left and right frame member (13).
The front crossbar member (15) connects at least the front part among the front, rear, and midway parts of the side frame member (1).
The reinforcement frame structure for a tractor according to claim 1 or 2, wherein the reinforcement frame structure is formed of a pipe material protruding outwardly from the left and right. 7. The crossbar member is a left and right frame member (13).
At least a rear part of the front, rear, and midway parts of the above is connected, and a plurality of upper and lower rod members for connecting the rear crossbar member (14) to a plurality of upper and lower parts of the rear part of the left and right side frame members (13) respectively. It is formed by.
Alternatively, the reinforcing frame structure for the tractor according to Item 2. 8. The crossbar member is a left and right frame member (13).
The rear part or the middle part of the left and right side frame members (1
The reinforcing frame structure for a tractor according to claim 1 or 2, wherein the front part of (3) has a pipe material protruding in the left-right direction.