JP4568342B2 - Working machine - Google Patents

Description

  The present invention relates to a working machine that pivotally supports a bonnet so as to swing up and down by a pivot pin and a pivot pin hole so as to swing up and down.

Conventionally, for example, a tractor described in Patent Document 1 has been provided with a hood that can be swingably opened and closed and detachable.
The tractor described in Patent Document 1 includes a connecting tool provided on the upper bonnet, a bonnet support pin engaged with a pin hole of the connecting tool, and a retaining pin attached to the connecting tool, and the upper bonnet is connected to the bonnet support pin. It is pivotally supported so that it swings up and down around the shaft core. By removing the retaining pin, the upper bonnet can be removed by detaching the connector from the bonnet support pin.

JP 2002-240577 (paragraphs [0036]-[0038], FIGS. 9 and 10)

By adopting the conventional technology described above, the bonnet can be pivoted up and down in the ascending and descending posture and the bonnet can be removed. It was.
In other words, it has been necessary to remove the lock of the bonnet pivot by removing the retaining pin.

  An object of the present invention is to provide a working machine that can easily remove a bonnet while being able to stably support a swingable up and down bonnet in an ascending open posture.

The first aspect of the present invention is a working machine for pivotally supporting a bonnet so as to swing up and down by a pivot pin and a pivot pin hole in an ascending open position and a descending closed position.
The pivot pin hole is provided with an opening through which the pivot pin is engaged and disengaged in a state where the bonnet is lowered from the rising and opening posture.
A support pin provided on one of the bonnet and the bonnet support, a support pin hole provided on the other of the bonnet and the bonnet support, and an opening provided so that the support pin is engaged with and disengaged from the support pin hole. A bonnet support means provided with
As the bonnet is raised to the upwardly open position, the support pin is engaged with the support pin hole, and the bonnet support means is switched to the operating state to support the bonnet in the upwardly open position, and the bonnet is raised. The support pin is separated from the support pin hole as it descends from the open posture, and the bonnet support means is switched to the action release state.

According to the configuration of the first aspect of the present invention, when the bonnet is lowered from the rising and opening posture, the support pin is detached from the support pin hole and the bonnet support means is switched to the released state, and the pivot pin is pivotally supported. By disengaging from the pin hole, the pivot of the bonnet by the pivot pin and the pivot pin hole can be removed and the bonnet can be removed.
When the bonnet is in the upwardly open position, the support pin is engaged with the support pin hole, and the bonnet support means is switched to the operating state to support the bonnet in the upwardly open position.

  Therefore, in order to remove the bonnet while pivoting the bonnet up and down in a swingable manner and allowing the bonnet support means to stably support the opened bonnet during inspection and repair, The pivot pin can be removed by removing it from the pivot pin hole simply by lowering the bonnet from the ascending open position, and can be easily removed without requiring a special pivot unlocking operation.

  In the second aspect of the invention, biasing means for swinging and biasing the bonnet to the upwardly open posture is provided.

According to the configuration of the second aspect of the invention, when opening the bonnet, the opening operation can be lightly performed using the swinging urging force by the urging means.
When the urging means acts on the one provided with the opening provided in the pivot pin hole, the bonnet pivot by the pivot pin and the pivot pin hole is rattled to raise the bonnet by the urging means. It tends to occur. However, the bonnet operated in the rising and opening posture is stably supported by the bonnet support means switched to the operating state, and the backlash caused by the urging means is less likely to occur.

  Therefore, the bonnet can be easily removed by simply detaching the pivot pin and the pivot pin hole, and the bonnet can be opened lightly by using the oscillating bias by the biasing means. However, the opened bonnet can be stably supported by the bonnet support means.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is an overall side view of a working machine according to an embodiment of the present invention. As shown in this figure, a working machine according to an embodiment of the present invention includes a pair of left and right steering operations and driveable front wheels 1, 1, a pair of left and right driveable rear wheels 2, 2, and a front of the vehicle body. A self-propelled vehicle is configured by including a driving unit 4 having an engine 3 provided at a part and a driving unit 6 having a driver seat 5 provided at a rear part of the vehicle body. A link mechanism 9 that is swingably supported by a mission case 8 constituting the rear portion of the frame 7 and a power take-out shaft 8a that protrudes from the mission case 8 toward the rear of the vehicle body are provided.

  In this working machine, a rotary tiller (not shown) is connected to the rear part of the vehicle body of the self-propelled vehicle via the link mechanism 9 so as to be movable up and down, and the output of the engine 3 is sent from the power take-out shaft 8a to the rotary tiller. Various working devices are connected to the rear part of the vehicle body so as to be lifted and driven freely, such as a riding type tiller configured to transmit to the vehicle.

  FIG. 2 is a longitudinal side view of the driving unit 4. As shown in FIG. 1 and FIG. 1, the driving unit 4 includes the engine 3, a pair of left and right side plates 10, 10, a bonnet 11, and a left and right side connected to the inside of the bonnet 11. A pair of gas springs 12 is provided.

  The pair of left and right lateral plates 10, 10 and the bonnet 11 are provided in the front part of the vehicle body frame 7, with a driving part room for housing the engine 3 and an engine fuel tank T located behind the engine 3. It is formed above the front wheel support frame 7a constituting the part.

  The pair of left and right lateral plates 10, 10 are detachably supported by a portal support frame 13 and a front wheel support frame 7a as viewed from the front and rear of the vehicle body.

  The bonnet 11 is supported by the support frame 13 via a pair of left and right bonnet pivot mechanisms 20, 20 provided across the rear end of the bonnet 11 and the support frame 13.

  FIG. 2 shows a structure of the bonnet pivot mechanism 20 in a side view. FIG. 3 is a front view of the pair of left and right bonnet pivot mechanisms 20, 20. As shown in these drawings, each bonnet pivot mechanism 20 includes a connecting portion 11a provided with a plate attached to the rear end portion of the bonnet 11, and a long hole-shaped pivot provided in the connecting portion 11a. The support pin hole 21, the bonnet support 22 extending from the support frame 13 toward the front of the vehicle body, and the pivot support pin hole 21 are configured to be rotatably and slidably engaged with the bonnet support 22. And a pivot pin 23 provided on the head.

  The connecting portion 11a of each bonnet pivot support mechanism 20 includes a block body 24 attached to one side surface of the bonnet pivot support mechanism 20 so as to prevent the pivot pin hole 21 from being deformed by the contact between the connection portion 11a and the pivot pin 23. It is reinforced by the block body 24. The pivot pin 23 of the left bonnet pivot mechanism 20 and the pivot pin 23 of the right bonnet pivot mechanism 0 are formed of a single pin material.

  That is, the bonnet 11 is pivotally supported by the pivot pin 23 and the pivot pin hole 21 of the pair of left and right bonnet pivot support mechanisms 20, 20, and is an axis provided in the pivot pin 23. 1 is shown by a two-dot chain line in FIG. 1 around the vehicle body side opening / closing axis P located on the rear end side of the vehicle, and a rising open posture shown by a solid line in FIG. 4 and a downward closing posture shown by a solid line in FIGS. Swing up and down.

  As shown in FIG. 4, the pair of left and right gas springs 12 and 12 includes a cylindrical body 12 a whose one end is pivotally supported by the bonnet 11, and one end side is slidably fitted into the cylindrical body 12 a, and the other end is A rod 12b supported by the bracket 14 and a gas sealed in the cylindrical body 12a so as to project and urge the rod 12b from the cylindrical body 12a are configured to swing the bonnet 11 in an ascending open posture. To force. The bracket 14 is supported on the upper portion of the engine 3.

  As shown in FIGS. 2 and 6, the pivot pin hole 21 of the pair of left and right bonnet pivot mechanisms 20, 20 is provided with an opening 25 that opens rearward at the rear end of the bonnet in the longitudinal direction of the bonnet. . A pair of left and right bonnet pivot mechanisms 20, 20 are provided with a bonnet support means 30 having a support pin 31 provided on the connecting portion 11a of the bonnet 11.

  The bonnet support means 30 of each bonnet pivot mechanism 20 includes the support pin 31, a support pin hole 32 provided in the bonnet support body 22, and the support pin hole 32 facing the vehicle body upward and rearward of the vehicle body. An opening 33 is provided so as to open in the direction.

  FIG. 4 shows the structure of the bonnet support means 30 in a side view in the operating state. As shown in this figure, when the bonnet 11 is in the ascending open position, the support pin 31 is engaged with the support pin hole 32 through the opening 33 and the bonnet support means 30 is switched to the operating state. Then, the bonnet support means 30 is supported by the bonnet support 22 via the support pin 31 to the connecting portion 11a, and thereby the pivot pin 23 is positioned at the opening 25 of the pivot pin hole 21. By positioning at the end opposite to the side, the bonnet 11 is supported in the ascending open posture, and the detachment of the pivot pin 23 from the pivot pin hole 21 is disabled, and the bonnet 11 is supported in the ascending open posture.

  FIG. 2 shows the structure of the bonnet support means 30 in a side view when the action is released. As shown in this figure, when the bonnet 11 is operated to be lowered from the ascending open posture, the support pin 31 comes out of the opening 33 of the support pin hole 32 accordingly. Then, the bonnet means 30 switches to an action release state, and enables the bonnet 11 to swing downward.

  That is, as shown in FIG. 4, in order to open the engine room, the hood 11 is moved up and down around the opening / closing axis P. At this time, the lifting operation can be performed lightly by the upward biasing of the hood 11 by the pair of left and right gas springs 12, 12. When the support pin 31 is engaged with the support pin hole 32 as the bonnet 11 is lifted, the bonnet 11 is in a lifted open position to open the engine room above and in front of the lateral plate 10. At this time, the bonnet support means 30 is switched to the operating state by engaging the support pin 31 into the support pin hole 32, and the bonnet 11 becomes a long hole of the pivot support pin hole 21 regardless of the upward biasing force by the gas spring 12. It is supported by the bonnet support means 30 so as not to cause the looseness caused.

  As shown in FIG. 2, in order to close the engine room, the bonnet 11 is moved downward and swinging around the opening / closing axis P. Then, the support pin 31 is detached from the support pin hole 32, the bonnet support means 30 is switched to the action release state, and the bonnet 11 is lowered. When the rear end side of the bonnet 11 is connected to the lateral side plate 10, the bonnet 11 is lowered and closed, and the engine room is closed.

  FIG. 5 is a side view of the bonnet pivot mechanism 20 during bonnet removal. FIG. 6 is a side view of the hood pivot support mechanism 20 with the hood removed. As shown in these drawings, when the bonnet 11 is swung down from the upwardly opened posture, the support pin 31 is detached from the support pin hole 32, and the bonnet support means 30 is switched to the release state. Pull the vehicle forward. Then, the connecting portion 11a of the bonnet 11 moves to the front side of the vehicle body with respect to the bonnet support body 22, the pivot pins 23 of the pair of left and right bonnet pivot mechanisms 20, 20 are detached from the pivot pin holes 21, and the bonnet 11 Is disengaged from the pair of left and right bonnet supports 22, 22.

The pivot pin hole 21 of the pair of left and right bonnet pivot mechanisms 20, 20 includes a start end portion 21a having the opening 25, and a back side portion 21b located on the opposite side to the side where the opening 25 is located. The mounting guide 40 is provided on the bonnet support body 22 of the pair of left and right bonnet pivot support mechanisms 20, 20 above the support pin hole 32. .
FIGS. 7A, 7 </ b> B, and 7 </ b> C are side views showing how to install the bonnet 11. As shown in these drawings, when the support pin 31 is slid and lowered to the starting end side portion 40a of the mounting guide 40, the pivot pin 23 is removed from the opening 25 by the guiding action of the starting end side portion 40a. It enters into the start end portion 21 a of the pivot pin hole 21. When the support pin 31 reaches the intermediate portion 40 b of the mounting guide 40, the bonnet 11 is slightly lowered and swung around the axis of the support pin 31, whereby the pivot pin 23 is moved to the back side portion of the pivot pin hole 21. When it moves to the entrance of 21b, the support pin 31 is slid to the terminal side part 40c of the attachment guide 40 and lowered. Then, by the guiding action of the end side part 40 c, the pivot pin 23 enters the back side part 21 b of the pivot pin hole 21, and the bonnet 11 can be connected to the pair of left and right bonnet supports 22.

[Another Example]
Instead of the gas spring 12 of the above-described embodiment, an upward biasing mechanism configured using a bending link that is connected to the bonnet 11 and a winding spring that biases the bending link toward the extension side may be employed. Therefore, the gas spring 12, the upward biasing mechanism, etc. are collectively referred to as the biasing means 12.

  Instead of the above-described embodiment, a configuration in which a support pin is provided in the bonnet support and a support pin hole is provided in the bonnet may be adopted. Also in this case, the object of the present invention can be achieved.

Overall side view of work equipment Longitudinal side view of the prime mover Front view of bonnet pivot mechanism Side view of bonnet ascending Side view of bonnet pivot mechanism during bonnet removal Side view of bonnet pivot mechanism with hood removed Side view showing how to install the bonnet

Explanation of symbols

11 Bonnet 12 Energizing means 21 Pivot pin hole 22 Bonnet support body 23 Pivot pin 30 Bonnet support means 31 Support pin 32 Support pin hole 33 Opening

Claims (2)

A working machine that pivotally supports a bonnet swinging up and down by a pivot pin and a pivot pin hole in an ascending and descending posture.
The pivot pin hole is provided with an opening through which the pivot pin is engaged and disengaged in a state where the bonnet is lowered from the rising and opening posture.
A support pin provided on one of the bonnet and the bonnet support, a support pin hole provided on the other of the bonnet and the bonnet support, and an opening provided so that the support pin is engaged with and disengaged from the support pin hole. A bonnet support means provided with
As the bonnet is raised to the upwardly open position, the support pin is engaged with the support pin hole, and the bonnet support means is switched to the operating state to support the bonnet in the upwardly open position, and the bonnet is raised. A work machine configured such that the support pin is detached from the support pin hole and the bonnet support means is switched to the action release state as it descends from the open posture.   2. The working machine according to claim 1, further comprising urging means for oscillating and urging the bonnet in a rising and opening posture.

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