JP4662441B2 - Working vehicle - Google Patents

Description

  The present invention relates to a working vehicle such as a tractor, and more particularly to a bonnet opening holding structure for holding a bonnet at a predetermined opening position.

In general, a working vehicle such as a tractor is provided with a hood opening holding structure for covering an upper part of an engine room with an openable / closable bonnet and holding the hood at a predetermined opening position. For example, a rod provided rotatably on the bonnet side and a guide plate provided on the engine room side, and sliding and guiding the rod tip portion with a long hole-shaped guide hole formed in the guide plate, A bonnet open holding structure is known in which the bonnet is held at a predetermined open position by locking the rod tip with a locking groove of the guide hole (see, for example, Patent Documents 1 and 2).
JP 2003-54450 A Japanese Utility Model Publication No. 3-121089

  By the way, in the bonnet open holding structure as described above, it is necessary to limit the movement of the rod in two directions with respect to the guide plate. One is the movement of the rod away from the guide plate because the tip of the rod comes out of the guide hole. The other is the movement in the direction in which the rod approaches the guide plate, because the bent portion of the rod enters the guide hole and hinders smooth sliding of the rod.

  Therefore, in Patent Document 2, a pair of retaining rings are attached to the tip of the rod to restrict the movement of the rod in two directions. However, according to such a configuration, not only the number of parts increases but also the rod Since the shape becomes complicated, there is an inconvenience that causes an increase in cost.

The present invention has been created in order to solve these problems in view of the above circumstances, and is provided with an openable / closable bonnet that covers the upper part of the engine room, and is rotatably provided on the bonnet side. A rod and a guide plate provided on the engine room side are provided, and the rod tip is slidably guided by an elongated guide hole formed in the guide plate, and the rod tip is fitted by a locking groove of the guide hole. In the working traveling vehicle that holds the bonnet in a predetermined open position by locking, the rod base end portion bent into the crank shape of the rod is positioned on the bonnet at a position rearward of the rear end portion of the guide plate. The rod tip that is pivotally supported and bent into a crank shape of the rod is inserted into the guide hole so as to be inserted therethrough, and the guide hole faces in the front-rear direction. The rear end portion of the guide hole is engaged with the tip end portion of the rod when the bonnet is opened to the open position to hold the bonnet in the open position at a position lower than the rear end portion of the guide plate. A bent groove where a side surface of the rod is in contact with the rear end portion of the guide plate so as to bend toward the rod side and limit the movement of the rod tip portion in the entering direction. A stopper ring for restricting the movement of the rod tip portion in the removal direction is provided at the tip portion of the rod tip portion inserted through the guide hole of the rod tip portion. The working vehicle is configured to ensure a predetermined distance between the rod and the guide plate due to the restriction .
If comprised in this way, it will become possible to maintain the space | interval of a rod and a guide plate using some guide plates. Thereby, not only the number of parts is reduced, but also the rod shape is simplified, so that the cost can be reduced.

  Next, embodiments of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes an engine room formed at the front of the tractor body, and an engine 2 and a radiator 3 are arranged in the engine room 1. The engine room 1 has an opening at least upward, and this opening is covered by the bonnet 4. The bonnet 4 is supported by a bonnet support shaft 5 provided at the back side of the engine room 1 so as to be pivotable up and down, and is opened and closed by raising and lowering the front or side.

  A bonnet opening and holding mechanism 6 that holds the bonnet 4 at a predetermined opening position is formed on the back side of the engine room 1. The bonnet opening and holding mechanism 6 includes a rod 7 that is rotatably provided on the bonnet 4 side, a guide plate 8 that is provided on the engine room 1 side, and a spring 9 that biases the rod 7 rearward. Yes.

The rod 7 is a metal rod in which both end portions 7a and 7b of the base end portion 7a and the tip end portion 7b are bent into a crank shape, and the rod base end portion 7a is, for example, as shown in FIG. It is supported by a rod bracket 10 protruding from the lower surface of the bonnet 4 at a position rearward of the rear end portion (a “bending portion 8c” described later) so as to be able to turn back and forth. In this embodiment, when the rod base end portion 7a is pivotally supported by the round hole 10a of the rod bracket 10, the rod base end portion 7a is retained by the pair of convex portions 7c crushed into the rod base end portion 7a. ing. Therefore, a pair of recesses 10b is formed in the round hole 10a of the rod bracket 10 so that the rod base end portion 7a can be incorporated. Therefore, after the rod base end portion 7a is incorporated into the rod bracket 10, it is necessary to rotate the rod 7 within a range where the positions of the concave portion 10b and the convex portion 7c do not coincide.

On the other hand, the guide plate 8 is provided integrally with the stay 11 fixed in the engine room 1 so that the front and back surfaces face the left and right. The guide plate 8 is formed with a long hole-shaped guide hole 8a extending in the front-rear direction, and the rod tip 7b is engaged with the guide hole 8a. Further, as is apparent from FIG. 3 , for example , a locking groove 8b is formed in the rear end portion of the guide hole 8a.

  As shown in FIGS. 1 and 3, when the bonnet 4 is closed, the rod tip 7b is located at the front end of the guide hole 8a. When the bonnet 4 is opened in this state, the rod distal end portion 7b moves backward while being slidably guided by the guide hole 8a as the rod base end portion 7a rises. As shown in FIGS. 2 and 4, when the bonnet 4 is opened to a preset open position, the rod tip 7b reaches the position of the locking groove 8b and receives the urging force of the spring 9 to engage. It automatically engages with the stop groove 8b. Thereby, the rotation of the rod 7 is restricted, and the bonnet 4 is held at a predetermined open position.

  On the other hand, when closing the bonnet 4 held in a predetermined open position, the rod 7 is lifted with the other hand while supporting the bonnet 4 with one hand. As a result, the rod tip 7b is disengaged from the locking groove 8b, and forward movement along the guide hole 8a is allowed, so that the bonnet 4 can be arbitrarily closed.

  When the bonnet 4 is opened and closed as described above, the rod 7 rotates relative to the bonnet 4. In the present embodiment, there is provided a configuration for making the opening angle of the bonnet 4 as large as possible while making the rotation angle as small as possible and avoiding the coincidence of the concave portion 10b and the convex portion 7c described above. . Specifically, by tilting the guide hole 8a of the guide plate 8 in a front-rear and a rear-high shape, a large opening / closing angle of the bonnet 4 is secured while suppressing a rotation angle of the rod 7 with respect to the bonnet 4. In this way, a sufficient bonnet opening / closing angle can be secured even if the rod base end portion 7a is prevented from coming off by the pair of convex portions 7c crushed into the rod base end portion 7a.

  In the bonnet opening and holding mechanism 6 configured as described above, it is necessary to limit the movement of the rod 7 in the two directions with respect to the guide plate 8. One is the movement of the rod 7 in the direction away from the guide plate 8 because the rod tip 7b comes out of the guide hole 8a. The other is the movement in the direction in which the rod 7 approaches the guide plate 8 because the bent portion of the rod tip 7b enters the guide hole 8a and hinders smooth sliding of the rod 7.

In this embodiment, one retaining ring 12 is attached to the rod tip 7b, and the retaining ring 12 restricts the movement of the rod tip 7b in the removal direction. The restriction is made by utilizing a part of the guide plate 8 without providing a retaining ring. Specifically, a bent portion 8c is integrally formed at the rear end portion of the guide plate 8 in the direction of the rod 7 as apparent from FIG. 5, for example, by contact between the bent portion 8c and the side surface of the rod 7. In this configuration, an appropriate distance is secured between the rod 7 and the guide plate 8.

  The tractor of the present embodiment configured as described above includes an openable / closable bonnet 4 that covers the upper portion of the engine room 1, a rod 7 that is rotatably provided on the bonnet 4 side, and a guide that is provided on the engine room 1 side. The rod tip 7b is slidably guided by a long hole-shaped guide hole 8a formed in the guide plate 8, and the rod tip 7b is locked by the locking groove 8b of the guide hole 8a. As a result, the bonnet 4 is held at a predetermined open position, but the guide plate 8 has a bent portion 8c that secures a predetermined distance between the rod 7 and the guide plate 8 by contact with the side surface of the rod 7. Since they are integrally formed, it is possible to maintain a distance between the rod 7 and the guide plate 8 by using a part of the guide plate 8. This not only reduces the number of parts, but also simplifies the rod shape, thereby reducing costs.

It is a side view of the engine room in a bonnet closed state. It is a side view of the engine room in a bonnet open state. It is a side view of the bonnet open | release holding | maintenance mechanism in a bonnet closed state. It is a side view of the bonnet open | release holding | maintenance mechanism in a bonnet open state. It is a left rear perspective view of the bonnet open | release holding | maintenance mechanism in a bonnet closed state. It is a right rear perspective view of the bonnet open | release holding | maintenance mechanism in a bonnet closed state. It is a right side perspective view of the bonnet open | release holding | maintenance mechanism in a bonnet open state. It is a left side perspective view of the bonnet open | release holding | maintenance mechanism in a bonnet open state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Engine room 4 Bonnet 5 Bonnet spindle 6 Bonnet open | release holding mechanism 7 Rod 7b Rod front-end | tip part 8 Guide plate 8a Guide hole 8b Locking groove 8c Bending part 9 Spring 12 Retaining ring

Claims (1)

An openable / closable bonnet that covers the upper part of the engine room, a rod that is rotatably provided on the hood side, and a guide plate that is provided on the engine room side, and a long hole-shaped guide hole formed in the guide plate with sliding guides the rod tip in, by locking the rod tip in the locking groove of the guide hole, in a work vehicle to hold the bonnet in a predetermined open position, cranked of the rod The processed rod base end is pivotally supported by the bonnet at a position rearward of the rear end of the guide plate, and the rod distal end bent into the crank shape of the rod is inserted and locked into the guide hole. The guide hole is formed to face in the front-rear direction, and the tip end of the rod engages with the rear end of the guide hole when the bonnet is opened to the open position. In order to hold the bonnet in an open position, a locking groove that is recessed downward is formed at a position in front of the rear end portion of the guide plate, and the rear end portion of the guide plate is bent toward the rod side. In order to limit the movement of the rod tip in the entry direction, a bent portion where the side surface of the rod contacts is formed, and the tip of the rod tip inserted through the guide hole restricts the movement of the rod tip in the removal direction. A retaining ring is provided for the operation, and is configured to ensure a predetermined distance between the rod and the guide plate by restricting the movement of the rod in the entry direction and the withdrawal direction . Traveling car.

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