JP5317779B2 - Bonnet support structure - Google Patents

Description

  The present invention relates to a bonnet support structure applied to a work vehicle having a bonnet such as a tractor.

  An engine directly or indirectly supported by a vehicle frame and a cabin directly or indirectly supported by the vehicle frame so as to be located behind the engine, and disposed to face the engine As a bonnet support structure applied to a work vehicle including a cabin having a sound insulation wall and a bonnet whose rear upper end is supported so as to be rotatable about a rotation axis along the vehicle width direction, the engine and the sound insulation wall A configuration in which a sound insulating plate is inserted is proposed (see Patent Document 1 below).

  The bonnet support structure described in Patent Document 1 is supposed to be able to suppress noise transmission from the engine into the cabin by including the sound insulating plate.

However, in the bonnet support structure described in Patent Document 1, the bonnet is supported so as to be able to rotate about the rotation axis on a vehicle front-rear-view gate-shaped support frame standing on a transmission case constituting the vehicle frame. The sound insulation plate is also supported by the support frame.
In other words, the vehicle front-rear gate-shaped support frame is an indispensable member. As a result, the cost increases, vibration of the vehicle frame is easily transmitted to the bonnet, and noise (so-called chatter noise) is generated from the bonnet. There was a problem that it was easy to do.

JP 2008-087491 A

  The present invention has been made in view of the prior art, and is directly or indirectly supported by the vehicle frame so as to be positioned behind the engine and the engine directly or indirectly supported by the vehicle frame. A cabin comprising a cabin having a shielding plate disposed so as to face the engine, and a bonnet whose rear upper end is supported so as to be rotatable about a rotation axis along the vehicle width direction. An object of the present invention is to provide a bonnet support structure that is applied to a vehicle and that can prevent noise caused by vibration of the bonnet as much as possible while reducing costs.

  In order to achieve the above object, the present invention includes an engine directly or indirectly supported by a vehicle frame and a cabin directly or indirectly supported by the vehicle frame so as to be located behind the engine. A rear upper end portion along the vehicle width direction so that a cabin having a shielding plate arranged to face the engine, a closed position covering the engine, and an open position opening the upper side of the engine can be taken. A bonnet support structure applied to a work vehicle provided with a bonnet supported so as to be rotatable about a rotation axis, wherein a support member supported on the front side of the shielding plate via a vibration isolating member is provided. And the pivot shaft provides a bonnet support structure that is directly or indirectly supported by the support member.

  When a locking member for locking the bonnet at the open position is provided, preferably, the locking member is directly or indirectly coupled to the support member at the base end.

  Preferably, the support member is a plate-like member arranged to face the front surface of the shielding plate.

  Preferably, an elastic seal member having a mounting portion attached to an upper end portion of the support member and a seal portion extending forward from the mounting portion is provided, and the seal portion is pressed against the rear end surface of the bonnet.

According to the bonnet support structure of the present invention, the support member is supported on the front surface side of the shielding plate provided on the front surface of the cabin via the vibration isolating member, and the rotating shaft of the bonnet is directly or indirectly on the support member. Therefore, the cost can be reduced by simplifying the structure as compared with the conventional configuration that requires a dedicated bonnet support frame for supporting the rotating shaft of the bonnet.
Furthermore, since the rotation shaft is supported by the support member supported by the vibration isolation on the shielding plate, it is possible to effectively suppress the propagation of vibration to the bonnet, and thereby the noise caused by the vibration of the bonnet. (So-called chatter noise) can be effectively reduced.

FIG. 1 is a side view of a tractor that is an example of a working vehicle to which a bonnet support structure according to an embodiment of the present invention is applied. FIG. 2 is a front perspective view of the vehicle frame and the cabin frame in the working vehicle shown in FIG. 3 is a rear perspective view of FIG. FIG. 4 is a partial longitudinal side view of the IV part of FIG. 1. 5A to 5C are end views of the elastic seal member in the bonnet support structure.

Hereinafter, a preferred embodiment of a bonnet support structure according to the present invention will be described with reference to the accompanying drawings.
FIG. 1 shows a side view of a tractor which is an embodiment of a working vehicle to which the bonnet support structure according to the present embodiment is applied.

  As shown in FIG. 1, a working vehicle 1 in the form of a tractor is supported by a vehicle frame 20, an engine 10 supported by the vehicle frame 20, and a vehicle frame 20 so as to be positioned behind the engine 10. And a hood 30 that covers the engine 10.

  In the present embodiment, the working vehicle 1 further includes a transmission case 50 connected to the rear end side of the vehicle frame 20 in a state of being separated from the engine 10 and a steerable vehicle disposed on the front side. A pair of left and right front wheels 60 and a pair of left and right rear wheels 70 disposed on the rear side, and the pair of left and right rear wheels 70 are driven by rotational power transmitted from the transmission case 50. Acting as driving wheels, the pair of left and right front wheels 60 act as sub driving wheels that can be driven by the rotational power transmitted from the transmission case 50.

2 and 3 show a front perspective view and a rear perspective view of the vehicle frame 20 and the cabin 40, respectively.
As shown in FIGS. 1 to 3, the vehicle frame 20 is connected to a pair of left and right front frames 21 disposed on the front side of the vehicle, and between the pair of front frames 21 and the left and right side walls of the transmission case 50. And a pair of left and right main frames 22.
A front axle case 65 that supports a front axle 61 connected to the front wheel 60 is supported on the pair of front frames 21.
Meanwhile, a rear axle case 75 that supports a rear axle 71 connected to the rear wheel 70 is connected to both side surfaces of the transmission case 50.

As shown in FIGS. 2 and 3, the cabin 40 has a blocking plate 41 disposed on the front surface so as to face the engine 10 (see FIG. 1).
In the present embodiment, the shielding plate 41 is fixed to the cabin frame forming the frame of the cabin 40 by welding or the like.

Specifically, the cabin 40 includes a lower frame portion 410 supported by a fixed assembly of the working vehicle 1 including the vehicle frame 20, a vertical frame portion 430 erected on the lower frame portion 410, and the vertical frame The upper frame part 450 supported by the upper end part of the part 430, and the outer roof 470 (refer FIG. 1) mounted in the said upper frame part 450 are provided.
The shielding plate 41 is erected on the lower frame portion 410.

The lower frame portion 410 includes a pair of left and right lower main side frames 411 extending substantially in the vehicle longitudinal direction on the outer side in the vehicle width direction from the pair of main frames 22, and front ends of the pair of lower main side frames 411. A pair of left and right lower front connecting members 412 extending inward in the vehicle width direction and a lower rear connecting member 413 for connecting rear ends of the pair of lower main side frames 411 are provided.
The pair of lower main side frames 411 includes a front side portion 411a extending substantially horizontally and a rear side portion 411b extending rearward from the rear end portion of the front side portion 411a. 411b.

In the present embodiment, the lower frame portion 410 is further on the outer side in the vehicle width direction from the pair of main frames 22 and on the inner side in the vehicle width direction from the pair of lower main side frames 411. A pair of left and right lower sub-side frames 414 substantially along the front-rear direction is provided.
The pair of lower sub-side frames 414 includes a front part 414a that extends substantially horizontally with a front end connected to the corresponding lower front connecting member 412, and a rear side that extends rearward from the rear end of the front part 414a. The portion 414b has a rear portion 414b that is located upward as it goes rearward.

Further, the lower frame portion 410 has a pair of left and right lower rear frames 415 extending in the vertical direction with an upper end portion connected to the lower rear connecting member 413.
The pair of lower rear frames 415 are connected via a pair of left and right mounting plates 416 to which the rear end portions of the pair of lower sub-side frames 414 are connected at the middle portion between the upper end portion and the lower end portion, and the lower end portions extend substantially horizontally. The pair of lower sub-side frames 414 are connected to the front and rear intermediate portions of the rear portion 414b.

  The lower frame portion 410 having such a configuration includes a pair of left and right vibration isolation members 45 interposed between the pair of lower front connecting members 412 and the pair of main frames 22, a pair of mounting plates 416, and a pair of And a pair of left and right anti-vibration members 46 interposed between the rear axle case 75 and a fixed assembly comprising the vehicle frame 20, the transmission case 50 and the rear axle case 75 in the work vehicle 1. It is supported.

As shown in FIGS. 2 and 3, the vertical frame portion 430 includes a pair of left and right vertical front frames 431 erected at the front end portions of the pair of lower main side frames 411 so as to extend along a substantially vertical direction. A pair of left and right vertical rear frames 432 provided upright at the rear ends of the pair of lower main side frames 411 are provided along the vertical direction.
In the present embodiment, the vertical frame portion 430 further includes a pair of left and right vertical subframes 433 that are erected at a middle portion in the front-rear direction of the rear portion 411b of the pair of lower main side frames 411. Have.

  The upper frame portion 450 includes an upper front frame 451 that connects upper ends of the pair of vertical front frames 431, and upper ends of the vertical front frame 431 and the vertical rear frame 432 that are located on the same side in the vehicle width direction. And a pair of left and right upper side frames 452 and an upper rear frame 453 for connecting upper ends of the pair of vertical rear frames 432 to each other.

The shielding plate 41 has a lower end fixed to the pair of lower front connecting members 412 so as to extend in the vehicle width direction and in a substantially vertical direction so as to form a part of the front surface of the cabin 40. .
In the present embodiment, the shielding plate 41 is also connected to the pair of vertical front frames 431 at the left and right side edges via the pair of left and right reinforcing frames 42.

  As shown in FIG. 1, the bonnet 30 is supported at the rear upper end portion so as to be rotatable about a rotation shaft 31 along the vehicle width direction, and is a closed position (position shown in FIG. 1) covering the engine 10. And it is comprised so that the open position which opens the upper direction of the said engine 10 can be taken.

Here, the bonnet support structure according to the present embodiment will be described.
FIG. 4 shows a partially longitudinal side view of the vicinity of the rotation shaft 31 shown in the IV part of FIG.

  As shown in FIG. 4, the bonnet support structure includes a support member 100 supported via a vibration isolation member 110 on the front surface side of the shielding plate 41 that forms a part of the front surface of the cabin 40. The support member 100 is configured to support the rotating shaft 31 directly or indirectly.

According to such a configuration, it is possible to reduce the cost by simplifying the structure as compared with the conventional configuration requiring a dedicated bonnet support frame for supporting the rotating shaft 31.
Further, since the rotating shaft 31 is supported by the support member 100 supported by vibration isolation on the shielding plate 41, vibration propagation to the bonnet 30 can be effectively suppressed. Noise (so-called chatter noise) associated with the vibration of the can be effectively reduced.

  In the present embodiment, as shown in FIG. 4, the rotation shaft 31 is supported by the support member 100 via an attachment stay 101 fixed to the support member 100.

When a locking member 120 such as a gas damper or a stand for locking the bonnet 30 in the open position is provided, preferably, the locking member 120 has a base end portion directly or indirectly on the support member 100. Connected to
According to such a configuration, the rotation shaft 31 and the locking member 120 are supported by the same support member 100, and accordingly, the bonnet 30, the rotation shaft 31 and the locking member 120 are supported. The positional accuracy between them can be improved.

  Further, according to the above configuration, vibration propagation to the locking member 120 can be effectively suppressed. Therefore, the vibration of the bonnet 30 when the bonnet 30 is locked in the open position by the locking member 120 is effectively suppressed, thereby reducing the noise of the bonnet 30 when it is positioned in the open position. It can be effectively reduced.

  In the present embodiment, as shown in FIG. 4, the locking member 120 is supported by the support member 100 via an attachment stay 102 fixed to the support member 100.

Preferably, the support member 100 is formed of a plate-like member that extends substantially vertically in a state along the vehicle width direction so as to face a part or all of the front surface of the shielding plate 41.
According to such a configuration, in addition to the above effects, noise propagation from the engine 10 to the interior of the cabin 40 can be effectively suppressed.

When the support member 100 is formed of a plate-like member, as shown in FIG. 4, the vibration isolation member 110 includes, for example, a first end surface 111 that comes into contact with the front surface of the shielding plate 41, A second end surface 112 located on the opposite side of the first end surface 111 and facing the engine 10, an outer peripheral surface 113 connecting the peripheral portions of the first and second end surfaces 111, 112, and the first It may be formed by an elastically deformable member having a through hole 114 passing through between the first and second end surfaces 111 and 112 and a groove 115 formed in the outer peripheral surface 113.
On the other hand, the plate-like support member 100 is formed with a mounting hole having a diameter smaller than the outer diameter of the outer peripheral surface 113 and larger than the inner diameter of the groove 115.

  In such a configuration, the vibration isolation member 110 includes a first portion 110a positioned closer to the first end surface 111 than the groove 115 and a first portion 110a positioned closer to the second end surface 112 than the groove 115. The two portions 110b are attached to the mounting holes of the support member 100 so that the two portions 110b are positioned on the cabin 40 side and the engine 10 side with respect to the support member 100, respectively. In this state, the supporting member 100 is connected to the shielding plate 41 via a fastening member 130 such as a bolt inserted into the through hole 114 of the vibration isolation member 110 and a fastening hole formed in the shielding plate 41. Supported by

As shown in FIG. 4, the bonnet support structure according to the present embodiment further includes an elastic seal member 320 attached to the upper end portion of the support member 100.
The elastic seal member 320 has a mounting part 330 attached to the upper end of the support member 100 and a seal part 340 extending forward from the mounting part 330, and the seal part 340 is a rear end surface of the bonnet 30. Is in pressure contact.

By providing the elastic seal member 320, it is possible to effectively prevent heat and noise from the engine 10 from coming out upward from the gap between the bonnet 30 and the shielding plate 41.
Furthermore, since the elastic seal member 320 is mounted on the support member 100 that supports the rotating shaft 31, the positional accuracy of the elastic seal member 320 with respect to the gap can be improved.

The elastic seal member 320 may take various forms as long as the mounting part 330 and the seal part 340 are integrally provided.
FIG. 5A shows an end view of an example 320A of the elastic seal member 320. FIG.
As shown in FIG. 5 (a), the mounting part 330 includes a pair of side walls 332 facing each other with a gap therebetween, and end walls 333 that connect one end sides of the side walls of the pair 332 to each other. A hollow main body 331 having a U-shaped cross-section in which the other end side of the side wall 332 is open, and a first detachment preventing piece 335 extending inward from the inner peripheral surfaces of the pair of side walls 332. Yes.
The first detachment preventing piece 335 is inclined such that the free end portion is located on the insertion direction side of the outer peripheral edge of the support member 100 from the base end portion.
In addition, the code | symbol 339 in Fig.5 (a) is the metal core built in the said main-body part.

As shown in FIG. 5A, the mounting part 330 further includes a second detachment preventing piece 336 extending outward from the main body 331 so as to be positioned in the vicinity of the opening of the main body 331. ing.
The second detachment preventing piece 336 includes a support part 337 extending from one of the pair of side walls 332 of the main body part 331 to the side opposite to the insertion direction of the outer peripheral edge, and a free end of the support part 337. And a contact portion 338 extending to the other side of the pair of side walls 332 and the insertion direction side of the outer peripheral edge.

In an example 320A shown in FIG. 5A, the seal portion 340 has a hollow shape with a substantially circular cross section.
Of course, the seal portion 340 may have various hollow shapes such as a rectangular cross section or an elliptical cross section.

5B and 5C show end views of other examples 320B and 320C of the second elastic seal member 320. FIG.
In the example 320B shown in FIG. 5B, the seal portion 340 has a shape in which a base end portion is connected to the main body portion 330 and a distal end portion is a free end portion.
In the example 320B shown in FIG. 5B, the seal portion 340 has a hook shape in which a portion from the base end portion to the tip end portion has a bent portion in a sectional view. A portion from the end portion to the tip portion may have a curved shape in a cross-sectional view.

In the example 320C shown in FIG. 5C, the seal portion 340 has a solid shape.
In this case, preferably, the sealing portion 340 includes a foaming portion. The seal portion 340 shown in FIG. 5C is formed of, for example, a material having a high expansion ratio (for example, a foamed urethane material).

DESCRIPTION OF SYMBOLS 1 Working vehicle 10 Engine 20 Vehicle frame 30 Bonnet 31 Rotating shaft 40 Cabin 41 Shut-off plate 100 Support member 110 Vibration-proof member 120 Locking member 320 Elastic seal member

Claims (4)

An engine directly or indirectly supported by a vehicle frame and a cabin directly or indirectly supported by the vehicle frame so as to be located behind the engine, and disposed to face the engine The rear upper end is supported so as to be rotatable about a rotation axis along the vehicle width direction so as to be able to take a cabin having a shielding plate, a closed position covering the engine, and an open position where the engine is opened upward. A bonnet support structure applied to a work vehicle equipped with a bonnet,
A support member supported via a vibration isolation member on the front side of the shielding plate;
A bonnet support structure, wherein the rotation shaft is directly or indirectly supported by the support member. A locking member for locking the bonnet in the open position is provided,
The bonnet support structure according to claim 1, wherein a base end portion of the locking member is directly or indirectly connected to the support member.   The bonnet support structure according to claim 1, wherein the support member is a plate-like member arranged to face the front surface of the shielding plate. An elastic seal member having an attachment part attached to the upper end of the support member and a seal part extending forward from the attachment part;
The bonnet support structure according to any one of claims 1 to 3, wherein the seal portion is in pressure contact with a rear end surface of the bonnet.

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