JP2920600B2 - Power transmission device for rolling rollers with tire drive wheels - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmitting device for a pressure roller having tire driving wheels, and more particularly to a power transmitting device for a large tire roller.

[0002]

2. Description of the Related Art Conventional tire rollers include, for example,
The one shown in FIG. 7 is known. This tire roller is
A hydraulic pump b that is driven by power transmission from the engine a and sends out hydraulic oil is provided below the driver's seat floor of the cabin c. One end of a hydraulic pipe d is connected to the hydraulic pump b, and the hydraulic pipe d extends below the floor of the driver's seat to the rear and the other end reaches the power transmission device e.

The power transmission device e includes a hydraulic motor f to which the other end of the hydraulic pipe d is connected and hydraulic oil supplied from the hydraulic pump b is supplied via the hydraulic pipe d;
Reducer g for reducing the rotation of the differential gear, a differential gear h to which the reduced rotation is input, and a chain mechanism j for transmitting the output of the differential gear h to the rear wheels (drive wheels) i.
And so on. A yoke m for supporting a front wheel (guide wheel) k is attached to the front part of the vehicle body via a vertically long kingpin o arranged in the front frame n so as to be pivotable.

However, in such a tire roller, since the power transmission device e is composed of a number of components such as the hydraulic motor f, the speed reducer g, the differential gear h, and the chain mechanism j, the structure becomes complicated. The number of steps for assembling each component increases, and maintenance requires a long time. Also, the tension adjustment of the chain is very troublesome.

[0005] In order to solve such inconvenience, a tire roller power transmission device disclosed in Japanese Utility Model Laid-Open No. 6-49505 has been proposed. This power transmission device
As shown in FIG. 8, a pair of mounting brackets r attached from a body frame to a mounting bracket r suspended between a pair of driving wheels p, p on the left side and a pair of driving wheels p, p on the right side. Hydraulic motor t. The pair of hydraulic motors t each have an output shaft s protruding only at one end of the motor housing, and are mounted on the left and right side plates of the mounting bracket r so that the output shafts s are outwardly symmetric. ing. A set of drive wheels p, p is attached to the tip of each output shaft s, and the drive wheel p located inside of the set of drive wheels p, p is located on the side of the mounting bracket r. It is arranged so as to surround the hydraulic motor t.

[0006] By supplying the hydraulic oil sent from the hydraulic pump to a hydraulic motor t via a hydraulic pipe (both not shown), the power of the engine is supplied via the hydraulic pump, the hydraulic pipe and the hydraulic motor t. It is transmitted to a set of drive wheels p, p, which drives the set of drive wheels p, p. In such a power transmission device, the drive wheel p is directly attached to the output shaft s of the hydraulic motor t to transmit the power of the engine from the hydraulic motor t to the drive wheel p, thereby reducing the speed of the reduction gear g, the differential gear h, and the chain mechanism. The structure is simplified by eliminating parts such as j, thereby eliminating the above-mentioned inconvenience.

[0007]

As the size of the tire roller increases, the capacity of the brake for applying a braking force to the rotation of the output shaft s becomes larger. Accordingly, when the size of the tire roller increases, the size of the brake also increases accordingly. However, in such a power transmission device for a tire roller, since two drive wheels p and p are mounted on the output shaft s protruding only at one end of the motor housing, an axial space for mounting the brake is reduced. We cannot secure enough. Therefore, it is difficult to apply such a power transmission device to a large tire roller.

SUMMARY OF THE INVENTION The present invention has been made to solve such inconvenience, and it is an object of the present invention to provide a power transmission device for a pressure roller capable of not only simplifying the structure but also ensuring a sufficient mounting space for a brake. The purpose is to provide.

[0009]

According to a first aspect of the present invention, there is provided a power transmission device for a pressure roller including a plurality of driving wheels each including a plurality of tires. Power transmission device for transmitting the power of
An output shaft disposed between a pair of adjacent two-wheel drive wheels, the output shaft to which the pair of drive wheels is attached one by one is provided with a hydraulic motor protruding from both ends of a motor housing,
A service brake device is provided between an end of the motor housing and a drive wheel attached to the output shaft protruding toward the end.

According to a second aspect of the present invention, in the power transmission device for a pressure roller, the hydraulic motor is a multi-stroke type radial piston motor. According to a third aspect of the present invention, in the power transmission device for a pressure roller, the service brake device is attached to an end of the motor housing. According to a fourth aspect of the present invention, in the power transmission device for a pressure roller, a negative brake is provided as a parking brake device inside the motor housing.

According to a fifth aspect of the present invention, in the power transmission device for a pressure roller, the service brake device is a drum brake.

[0012]

According to the first aspect of the present invention, one drive wheel is attached to each of the output shafts protruding from both ends of the motor housing, so that the space in the axial direction of the output shaft is widened and the end of the motor housing is driven. The mounting space for the service brake device to be installed between the wheels is widened.

[0013] Further, by attaching driving wheels to the output shaft of the motor and transmitting the power of the engine from the motor to the driving wheels, the structure of the apparatus can be eliminated by eliminating the need for parts such as a reduction gear, a differential gear and a chain mechanism. Simplify.
According to the second aspect of the invention, in addition to the first aspect of the invention, a multi-stroke radial piston motor having a low-speed, high-torque and thin structure is adopted as the hydraulic motor to obtain a driving torque required for a large compaction roller. At the same time, the space in the axial direction of the output shaft is further increased to further increase the mounting space for the service brake device.

According to a third aspect of the present invention, in addition to the first or second aspect, by attaching the service brake device to the end of the motor housing, the power transmission device having the service brake device can be easily attached to the vehicle body. To make things possible. According to the invention of claim 4, in addition to the invention of any of claims 1 to 3, a wide range of braking force is applied to the rotation of the output shaft by providing a negative brake as a parking brake device inside the motor housing. I do.

According to a fifth aspect of the present invention, in addition to any one of the first to fourth aspects, an inexpensive drum brake is used as a service brake device to reduce the cost of the device.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is an explanatory side view in which a part of a tire roller with a cabin provided with a power transmission device according to an embodiment of the present invention is cut away, and FIG. 2 is an explanatory plan view for explaining the inside of the tire roller with a cabin. FIG. 3, FIG. 3 is a cross-sectional view taken along a line in FIG. 1, FIG. 4 is an explanatory cross-sectional view for explaining a power transmission device, FIG.
It is a line sectional view.

First, the overall structure of a tire roller with a cabin will be described with reference to FIGS. 1 and 2.
Is provided. Three tire guide wheels (front wheels) 4a to 4c are arranged at equal intervals in the width direction of the vehicle body 2 at a front portion of the vehicle body 2,
At the rear, four tire drive wheels 5a to 5d (rear wheels) are arranged at equal intervals in the width direction of the vehicle body 2.

As shown in FIG. 1, the cabin 3 is formed into a substantially box-like unit by a roof 6, a floor 7, and front, rear, left and right side members 8a to 8d, and is fixed to an upper portion of the vehicle body 2. . Inside the cabin 3, various operation levers such as a not-shown instrument, a brake pedal, a parking brake lever, and the like are installed in advance in addition to the driver's seat 9 and the steering wheel 10.

The guide wheel 4b, which is located at the center among the guide wheels 4a to 4c, is surrounded by a horizontally arranged rectangular frame 11. An axle 12 passes through the frame 11, and guide wheels 4a to 4c are rotatably supported on the axle 12. As shown in FIGS. 1 and 2, the lower end of the yoke 13 is fixed to the front and rear ends of the frame 11. The upper end of the yoke 13 is connected to the upper panel 16 of the front frame 15 of the vehicle body 2 via the turning bearing 14.
It is supported to be able to turn freely.

As shown in FIG. 3, the revolving bearing 14 employs a cross roller bearing in which a roller 19 is held by a retainer 20 between an inner ring 17 and an outer ring 18 as shown in FIG. ing. Although the roller 19 uses a cylindrical roller here, a tapered roller may be used instead. In addition to the cross roller bearing, a single-row or double-row thrust angular ball bearing, a turning thrust cylindrical roller bearing, or the like can be used as the turning bearing 14.

The pivot bearing 14 is horizontally interposed between the yoke 13 and the upper panel 16 with its axis centered on the pivot center of the yoke 13. In this embodiment, the inner ring 17 is provided. Is fixed to the upper surface of the yoke 13, and the outer ring 18 is fixed to the lower surface of the upper panel 16. Such fixing is performed by a number of bolts and the like (not shown) for both the inner ring 17 and the outer ring 18. Then, the swing bearing 14 having such a small height is attached to the yoke 1.
By interposing horizontally between the upper panel 3 and the upper panel 16, the thickness of the front frame 15 is reduced, and the problem of poor visibility caused by reducing the height of the cabin 3 (described later) is solved. ing.

As shown in FIGS. 2 and 3, from the upper end of the yoke 13, a steering arm 21 extends in the width direction of the vehicle body 2, and a tip of the steering arm 21 is provided with a steering cylinder device. 22 piston rods 23 are connected.
The cylinder device 22 turns the yoke 13 via the steering arm 21 by the expansion and contraction, and steers the guide wheels 4a to 4c. Specifically, as is well known, the controller controls the opening of a control valve (neither is shown) by operating the steering wheel 10, so that the cylinder device 2 is operated.
The fluid pressure to 2 is adjusted, and the piston rod 23 expands and contracts. By such expansion and contraction, the steering arm 21 turns integrally with the yoke 13, and the guide wheels 4a to 4c are steered. At this time, in the revolving bearing 14, the inner ring 17 rotates with respect to the outer ring 18 while the roller 19 rotates, so that the yoke 13 can smoothly rotate.

As shown in FIGS. 1 and 2, an engine 24 is disposed in front of the cabin 3 with its crankshaft (not shown) oriented in the width direction of the vehicle body 2 and is so-called horizontally placed. ing. By arranging the engine 24 sideways in this manner, the weight distribution of the vehicle is not deviated to the front, and the front and rear weight balance of the vehicle is secured. A hydraulic pump 25 is attached to one end (left end) of the engine 24 in the width direction of the vehicle body 2. The hydraulic pump 25 is driven by power transmission from the engine 24 and sends out hydraulic oil. One end of each of two hydraulic pipes 26a and 26b is connected to the hydraulic pump 25. As shown in FIG. 2, the other ends of the hydraulic pipes 26a and 26b extend substantially horizontally to the rear of the cabin 3 on the left side.
It is connected to a valve block 27 disposed above between the driving wheels 5b and 5c. Valve block 27
Is disposed at the rear of the cabin 3, and one end of each of two branch pipes 28 a and 28 b is connected to both sides thereof. The other end of each of the branch pipes 28a and 28b extends downward from both sides of the valve block 27 to form a power transmission device 29.
Has been reached.

Next, the power transmission device 2 which is an essential part of the present invention will be described.
9 will be described. The power transmission device 29 includes the engine 2
4 is transmitted to the drive wheels 5a to 5d, and as shown in FIG. 2, between the drive wheel 5a and the drive wheel 5b (a set of two drive wheels), and between the drive wheel 5c and the drive wheel 5c. Drive wheel 5d
(A pair of two-wheel drive wheels). The multi-stroke radial piston motor 30 is a known hydraulic motor that is thin and generates low-speed, high-torque. As shown in FIGS.
2 are protruding. The output shaft 32 is provided with tapered roller bearings 33 provided at both ends of the motor housing 31.
a, 33b so as to be rotatable.

On the outer peripheral portion of the motor housing 31, four mounting flanges 31a and 31b are formed at upper and lower positions, which are formed apart from each other in the axial direction of the output shaft 32. As shown in FIGS. 1, 2, 4 and 6, the mounting flanges 31a and 31b are provided between the drive wheel 5a and the drive wheel 5b from the body frame 32a and between the drive wheel 5c and the drive wheel 5d. Brackets 32b respectively suspended
Is fixed via a bolt 32c or the like.

More specifically, as shown in FIGS. 4 and 6, the bracket 32b includes a pair of mounting plates 32d which are spaced apart from each other in the width direction of the vehicle body 2 and are suspended from the vehicle body frame 32a behind the vehicle body 2. Prepare. As shown in FIGS. 4 and 6, the pair of mounting plates 32d are connected to each other by reinforcing ribs 32e and reinforced. A semicircular notch 32f corresponding to half the shape of the motor housing 31 in the circumferential direction is formed on the rear end surfaces of the pair of mounting plates 32d on the rear side of the vehicle body 2. A rectangular column-shaped mounting block 32g, 32h long in the width direction of the vehicle body 2 connects between the arc start points and the arc end points of the notch portions 32f of the pair of mounting plates 32d. As shown in FIG. 6, screw holes 32i for bolts 32c are formed at positions of the mounting blocks 32g and 32h corresponding to the mounting flanges 31a and 31b of the motor housing 31, respectively. Therefore, the motor housing 31 of the multi-stroke radial piston motor 30 is inserted into the cutout 32f, and the mounting flanges 31a, 31b are mounted on the mounting blocks 32g, 32h.
By using four bolts 32c, the multi-stroke radial piston motor 30 can be easily attached to the vehicle body 2. It goes without saying that the multi-stroke radial piston motor 30 can be easily removed.
When fixed to the bracket 32 b, each multi-stroke radial piston motor 30 is located behind the cabin 3.

As shown in FIG.
In the center of the inside is a thin cylinder block 34 with a circular cross section
Are fixed to the output shaft 32. On the left side of the cylinder block 34, a parking brake 41a composed of a multi-disc brake is provided. Parking brake 41a
Applies a predetermined braking force to the output shaft 32 by operating a parking brake lever (not shown) in the cabin 3. As shown in FIG. 5, a plurality (eight in the present embodiment) of cylinders 35 are formed at equal intervals in the circumferential direction on the outer peripheral portion of the cylinder block 34. Is inserted movably in the radial direction of the cylinder block 34. A cam ring 39 having a plurality of (six in this embodiment) cam surfaces 38 is fixedly disposed outside the cylinder block 34. In FIG. 4, the pressure oil flows into each cylinder 35 via the valve block 40 disposed on the right side of the cylinder block 34, so that the piston 37 moves in the cylinder 35. When the cylinder block 34 is pressed, the reaction force causes the output shaft 3
It is designed to rotate together with 2.

Brake mounting plates 41 are fixed to both ends of the motor housing 31 by bolts 41b and the like. A service brake 43 that applies a braking force to the output shaft 32 by operating a brake pedal (not shown) in the cabin 3 is mounted on the brake mounting plate 41. A brake drum 42 is arranged on the outer periphery of the service brake 43, and an outer end of the brake drum 42 is fixed to a hub 44 fitted to an end of the output shaft 32. By fixing the service brake 43 to the end of the motor housing 31 in this manner, the power transmission device 29 including the service brake 43 can be easily attached to the bracket 32b. In this embodiment, an inexpensive drum brake is used as a regular brake in order to reduce the cost of the apparatus, but a disk brake may be used instead.

In FIG. 4, the hub 44 of the outer driving wheel 5a is shown.
The disk wheel 45 of the drive wheel 5a is connected to the hub nut 4
6, the hub 44 of the inner drive wheel 5b
The disk wheel 45 of the drive wheel 5b is connected to the hub nut 4
6 attached. The drive wheels 5c and 5d are not shown, but similarly, the hub 4 of the outer drive wheel 5d
The disk nut 45 of the drive wheel 5d is connected to the hub nut 4
6, the hub 44 of the inner drive wheel 5c
The drive wheel 5c has a disc wheel 45 and the hub nut 4
6 attached. In the mounted state,
The distance between the driving wheel 5b and the driving wheel 5c is determined by the distance between the driving wheels 5b and 5c.
c are individually attached, and the interval is removable. In the present embodiment, it is set the dimensions L ₁ from the hub 44 the end face of the drive wheel 5b to the driving wheel 5c longer than the width L ₂ of the drive wheels 5b. The drive wheels 5a to 5d are mounted on the hub 44 by mounting flanges 31a, 3a of the motor housing 31.
This can be performed before or after fixing 1b to the bracket 32b.

The hydraulic pump 25 is operated in the cabin 3 by operating an accelerator pedal (not shown) and a forward / reverse switching device.
Supplies hydraulic oil to the valve block 27 via the hydraulic pipe 26a (or 26b), and supplies hydraulic oil from the valve block 27 to each multi-stroke radial piston motor 30 via the branch pipe 28a (or 28b). By doing so, each multi-stroke radial piston motor 30 is separately driven. By such driving, the drive wheels 5a to 5d rotate forward or backward, and the tire roller 1 with the cabin travels forward or backward. The driving wheels 5a, 5b,
The differential between 5c and 5d is that when the vehicle turns, the load on the inner and outer rings changes, and more hydraulic oil is supplied to the multi-stroke radial piston motor 30 on the outer wheel side with a smaller load than on the inner wheel side with a larger load. Secured by being supplied.

In the power transmission device 29 having such a configuration, a multi-stroke type radial piston motor 30 having a low speed, a high torque and a thin structure is adopted as a hydraulic motor, and the output shafts 32 protruding from both ends of a motor housing 31 are respectively provided. Drive wheels 5a and 5b (or drive wheels 5c and 5d)
Since the wheels are mounted one by one, the driving torque required for a large tire roller can be obtained, and the axial space of the output shaft 32 is smaller than the conventional structure in which two driving wheels are mounted at one end of the output shaft. Can be widely taken. As a result, a sufficient mounting space for the service brake 43 mounted between the end of the motor housing 31 and the drive wheel can be sufficiently secured, and a large-capacity service brake required for a large tire roller can be easily mounted. Can be.

Further, since the mounting flanges 31a and 31b of the motor housing 31 are mounted on the bracket 32b suspended between the pair of drive wheels 5a and 5b (or the drive wheels 5c and 5d) from the body frame 32a, The distance between the ground position of the outer driving wheel 5a (or driving wheel 5d) and the bracket 32b is shorter than that of the above, and moment load transmitted from the driving wheel 5a, 5b (or 5c, 5d) to the bracket 32b at the time of grounding. Can be significantly reduced. As a result, the mounting strength of the power transmission device 29 and the drive wheels 5a to 5d to the vehicle body frame 32a is greatly improved, and sufficient mounting strength can be ensured even for a large tire roller.

Further, since the parking brake 41a is provided in the motor housing 31 in addition to the service brake 43, a wider braking force can be applied to the rotation of the output shaft 32. Further, since the driving wheels 5a to 5d are directly attached to the output shaft 32 of the multi-stroke type radial piston motor 30 to transmit the power of the engine 24 to the driving wheels 5a to 5d, the conventional reduction gear, differential gear and Parts such as a chain mechanism can be eliminated, and the structure of the power transmission device can be simplified.

Further, a pair of driving wheels 5 is provided at both ends of the output shaft 32 of the multi-stroke type radial piston motor 30.
a, 5b (or the driving wheels 5c, 5d) are attached one by one, and the distance between the driving wheels 5b and 5c is set so that the driving wheels 5b, 5c can be attached and detached. Wheels 5a, 5d and inner drive wheel 5
b and 5c can be individually replaced, and replacement of the drive wheels can be easily performed.

Further, the engine 24 and the hydraulic pump 25
Are arranged in front of the cabin 3, the multi-stroke radial piston motor 30, the valve block 27 and the branch pipes 28 a and 28 b are arranged behind the cabin 3, and the hydraulic pipes 26 a and 26 b are arranged on the side of the cabin 3. Since the components are arranged so that the components are not arranged below the floor of the driver's seat of the cabin 3, the floor of the driver's seat 9 can be lowered to lower the position of the cabin 3, thereby lowering the vehicle height. be able to.

In the above embodiment, the multi-stroke radial piston motor 30 is used as the hydraulic motor.
It is not necessarily limited to this, and another hydraulic motor may be used. Further, in the above embodiment, the guide wheels 4a to 4a
Although the guide wheel 4c is constituted by a tire, the guide wheels 4a to 4c may be constituted by a steel drum-shaped rolling wheel.
Guide wheels 4a to 4c as rear wheels and tire drive wheels 5a to 5d
May be used as the front wheel.

[0037]

As is apparent from the above description, in the first aspect of the present invention, the space in the axial direction of the output shaft is larger than in the conventional structure in which two drive wheels are mounted on one end of the output shaft. As a result, it is possible to secure a sufficient mounting space for a service brake to be mounted between the end of the motor housing and the driving wheel on the end side, and to provide a large-capacity service brake required for a large tire roller. Can be easily attached.

Further, since driving wheels are directly attached to the output shaft of the hydraulic motor to transmit the power of the engine to the driving wheels, parts such as a conventional reduction gear, differential gear, and chain mechanism are not required. And the structure of the power transmission device can be simplified. According to the second aspect of the present invention, in addition to the first aspect of the present invention, a multi-stroke radial piston motor is employed as a hydraulic motor to obtain a driving torque required for a large compaction roller and to provide an axial direction of an output shaft. And the space for mounting the service brake device can be further widened.

According to a third aspect of the present invention, in addition to the first or second aspect of the present invention, the power transmission device having the service brake device can be easily attached to the vehicle body by mounting the service brake device to an end of the motor housing. The effect that it can be obtained is obtained. In the invention of claim 4, claims 1 to
In addition to the invention of any one of (3) and (3), by providing a negative brake as a parking brake device in the motor housing in addition to the service brake device, a wider range of braking force can be applied to the rotation of the output shaft. The effect is obtained.

According to the fifth aspect of the present invention, in addition to any one of the first to fourth aspects of the present invention, the use of an inexpensive drum brake as a service brake device has the effect of reducing the cost of the device. can get.

[Brief description of the drawings]

FIG. 1 is an explanatory side view, partially cut away, of a tire roller with a cabin provided with a power transmission device according to an embodiment of the present invention.

FIG. 2 is an explanatory plan view for explaining the inside of a tire roller with a cabin.

FIG. 3 is a sectional view taken along line-in FIG.

FIG. 4 is an explanatory cross-sectional view for explaining a power transmission device.

FIG. 5 is a sectional view taken along line − in FIG. 4;

FIG. 6 is a sectional view taken along line − in FIG. 4;

FIG. 7 is an explanatory diagram for explaining a conventional power transmission device.

FIG. 8 is an explanatory diagram for explaining a conventional power transmission device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Tire roller with cabin 5a-5d ... Drive wheel 24 ... Engine 29 ... Power transmission device 30 ... Multi-stroke radial piston motor 31 ... Motor housing 31a, 31b ... Mounting flange 32 ... Output shaft 32a ... Body frame 32b ... Bracket 41a … Parking brake 43… Service brake

Claims (5)

(57) [Claims] 1. A power transmission device for transmitting a power of an engine to a driving wheel of a rolling roller having a driving wheel composed of a plurality of tires, wherein the power transmitting device is disposed between a pair of driving wheels adjacent to each other. An output shaft to which the set of drive wheels is mounted one by one is provided with a hydraulic motor protruding from both ends of a motor housing, and is mounted on an end of the motor housing and the output shaft protruding toward the end. A power transmission device for a pressure roller, wherein a service brake device is provided between the driving wheel and the driving wheel. 2. The power transmission device for a pressure roller according to claim 1, wherein said hydraulic motor is a multi-stroke type radial piston motor. 3. The power transmission device for a roller according to claim 1, wherein the service brake device is attached to an end of the motor housing. 4. The power transmission device for a pressure roller according to claim 1, wherein a negative brake is provided as a parking brake device inside the motor housing. 5. The power transmission device for a pressure roller according to claim 1, wherein the service brake device is a drum brake.