JP7162566B2 - work vehicle - Google Patents

Description

The present invention relates to work vehicles.

2. Description of the Related Art Conventionally, as a work vehicle, for example, a work vehicle disclosed in Patent Document 1 is known. The work vehicle described in Patent Document 1 has an engine (“Engine [E]” in the document), a hood that can be opened and closed (“Bonnet [7]” in the document) that houses the engine, and a command to start the engine. A start command unit (“key switch [16]” in the document) is provided.

JP 2018-184168 A

In the work vehicle described in Patent Document 1, if the engine is started with the hood open, there is a risk that exhaust gas from the engine may splash on the inner surface of the hood.

In view of the above situation, there is a demand for a work vehicle whose engine does not start with the bonnet open.

The present invention is characterized by an engine , a radiator for dissipating heat from engine cooling water, an openable and closable bonnet that is configured to swing open and close around a front fulcrum and accommodates the engine and the radiator , and an outer peripheral portion of the radiator. A plate-shaped frame that closes the gap around the radiator, a detection mechanism that detects the open/closed state of the hood, a start command unit that commands the start of the engine, and a control unit that controls the engine. , wherein if the detection mechanism does not detect that the hood is closed, the control unit does not start the engine even if there is a command from the start command unit. The detection mechanism is configured to be able to swing about a detected portion provided at the rear portion of the bonnet and a swing axis extending in the horizontal direction, and the detected portion can swing as the bonnet swings toward the closing side. The detection unit has a swinging member that pushes from above, and a detection switch that detects that the swinging member is positioned at a closed position corresponding to the closed state of the bonnet. A support plate is supported, and the rocking member and the detection switch are supported by the support plate .

According to this characteristic configuration, if the bonnet is not closed, the engine will not start even if there is a command from the start command unit. This prevents the engine from starting with the bonnet open.

According to this characteristic configuration, the rear portion of the bonnet opens more than the front portion of the bonnet. Since the detection mechanism detects the open/closed state of the rear portion of the bonnet, the open/closed state of the bonnet can be accurately detected by the detection mechanism even when the bonnet is in a half-closed state.

According to this characteristic configuration, the detection switch pushes the swinging member from above as the bonnet swings toward the closing side, and the detection switch detects that the swinging member is positioned at the closed position. will be As a result, the detection mechanism can be configured with a simple mechanism.

Furthermore, in the present invention, it is preferable that the detection mechanism has an urging member that urges the oscillating member about the oscillating axis toward the side opposite to the closed position.

According to this characteristic configuration, the swinging member is biased by the biasing member to the side opposite to the closed position. As a result, malfunction of the swinging member can be prevented so that the swinging member is not positioned at the closed position in a state in which the detected portion does not push the swinging member.

Furthermore, in the present invention, it is preferable that a lock mechanism is provided to hold the position of the bonnet in a closed state, and the detection mechanism is arranged adjacent to the lock mechanism.

According to this characteristic configuration, the detection mechanism detects the open/closed state of the bonnet in the vicinity of the portion of the bonnet whose position is held by the lock mechanism. As a result, the open/closed state of the bonnet can be accurately detected by the detection mechanism while the bonnet is in a stable state.

Further, in the present invention, the lock mechanism is configured to be swingable about a swing axis parallel to the engaged portion provided at the rear portion of the bonnet and the swing axis to close the bonnet. and a hook that engages with the engaged portion by pushing the engaged portion from above as it swings to the side, and the detected portion and the engaged portion are the same. is preferable.

According to this characteristic configuration, it is possible to reduce the number of parts by sharing members. In addition, it is easy to arrange the detection mechanism and the lock mechanism near each other.
Furthermore, in the present invention, it is preferable that the hook is supported by the support plate.

It is a left side view showing a ride-on mower. It is a top view which shows a ride-on mower. It is a rear view showing a lock mechanism and a detection mechanism. It is a figure which shows a control structure. FIG. 4 is a rear view showing the lock mechanism and the detection mechanism, and is a rear view before the hood is closed; FIG. 10 is a rear view showing the lock mechanism and the detection mechanism, with the bonnet closed. FIG. 4 is a rear view showing the lock mechanism and the detection mechanism, and is a rear view in a state in which the bonnet is swung from the closed state to the open side. It is a left view which shows the oil line structure for power steering apparatuses.

A mode for carrying out the present invention will be described based on the drawings. In the following description, the direction of arrow F is the "front side of the fuselage" (see FIGS. 1 and 2), the direction of arrow B is the "rear side of the fuselage" (see FIGS. 1 and 2), and the direction of arrow L is the " The left side of the machine body" (see Fig. 2), and the direction of the arrow R is the right side of the machine body" (see Fig. 2).

[Overall configuration of riding lawn mower]
1 and 2 show a riding lawn mower (corresponding to the "work vehicle" according to the present invention). This riding lawn mower is equipped with a traveling body 1. - 特許庁The traveling body 1 includes a body frame 2, a pair of steerable left and right front wheels 3F, and a pair of drivable left and right rear wheels 3B. The fuselage frame 2 is provided with a pair of left and right main frames 2A extending along the longitudinal direction of the fuselage. A driving unit 4 is provided in the front part of the traveling body 1 . A drive unit 5 is provided behind the motor unit 4 . Mowers 6 are provided below the traveling body 1 between the front wheels 3F and the rear wheels 3B. A grass collection container 7 for collecting grass clippings from the mower 6 is supported at the rear portion of the traveling body 1 .

The driving unit 4 includes an engine E, a muffler 8 that discharges exhaust gas from the engine E, a radiator 9 that dissipates heat from engine cooling water, and a bonnet 10 that houses the engine E and the like. The engine E is mounted on the front part of the body frame 2 . A plate-shaped frame 11 is provided around the radiator 9 to close the gap around the radiator 9 . The bonnet 10 is configured to be swingable and openable around the front fulcrum S1. A damper 12 is provided to oscillate the bonnet 10 toward the opening side.

The operating section 5 is provided with a driver's seat 13 and a control tower 14. - 特許庁The control tower 14 includes a steering handle 15, a meter panel 16, a key switch 17 (corresponding to the "start command unit" according to the present invention) for commanding the start of the engine E, and a strut supporting the steering handle 15 (illustrated). (omitted) and the like are provided.

[Lock mechanism]
As shown in FIG. 3, a lock mechanism 19 is provided to hold the bonnet 10 in a closed position. The lock mechanism 19 is provided at a location corresponding to the rear portion of the bonnet 10 . The lock mechanism 19 includes a shaft 20 (corresponding to the “engaged portion” according to the invention), a hook 21 and a spring 22 .

Axle 20 is provided at the rear of bonnet 10 . The shaft 20 is supported by the top plate of the bonnet 10 via stays 23 inside the bonnet 10 . The shaft 20 is provided with an action portion 20a extending rearward when the bonnet 10 is closed. An upper portion of the frame 11 is formed with an opening 11a that opens upward so that the action portion 20a can enter as the bonnet 10 swings toward the closing side.

The hook 21 has a lock position (see FIG. 3) in which it engages with the action portion 20a and does not engage with the action portion 20a around the swing axis Y1 (a swing axis parallel to a swing axis Y2, which will be described later). It is configured to be swingable between the released position (see FIG. 7). The swing axis Y1 is a swing axis that extends along the horizontal direction in the longitudinal direction of the machine body. The hook 21 is arranged on the rear side with respect to the frame 11 . The hook 21 is provided with an operated portion 21a to which the acting portion 20a pushes from above as the bonnet 10 swings toward the closing side. The hook 21 is formed with an engagement groove 21b that engages with the action portion 20a.

A support plate 24 is provided to support the hook 21 and the like. The support plate 24 is arranged on the rear side with respect to the hook 21 . The hook 21 is supported by the support shaft 25 so as to be able to swing about the swing axis Y1, and is also supported by the support plate 24 via the support shaft 25. As shown in FIG. The support plate 24 is supported by the frame 11 via left and right stays 26 .

The spring 22 urges the hook 21 to swing toward the locked position about the swing axis Y1. A spring 22 is provided across the hook 21 and the support plate 24 . The support plate 24 is provided with a hooking portion 24a on which the spring 22 is hooked.

A positioning portion 24b for positioning the hook 21 at the lock position is provided on the front portion of the support plate 24. As shown in FIG. The left stay 26 also functions as a positioning member that positions the hook 21 at the release position (see FIG. 7). A release lever 27 is connected to the hook 21 for swinging the hook 21 about the swing axis Y1 toward the release position so as to release the engagement of the hook 21 with the action portion 20a. A handle 27 a is provided at the end of the release lever 27 opposite to the hook 21 . The handle 27a protrudes upward from the upper portion of the panel 18. As shown in FIG.

[Detection mechanism]
As shown in FIG. 3, a detection mechanism 28 is provided to detect whether the bonnet 10 is opened or closed. The detection mechanism 28 is provided at a location corresponding to the rear portion of the bonnet 10 . The detection mechanism 28 includes a shaft 20 (corresponding to a "detected portion" according to the present invention), a swing arm 29 (corresponding to a "swing member" according to the present invention), and a spring 30 (corresponding to a "swing member" according to the present invention). ) and a detection switch 31 are provided. That is, the "detected portion" according to the present invention and the "engaged portion" according to the present invention are the same (shaft 20).

The swing arm 29 is configured to swing around a swing axis Y2. The swing axis Y2 is a swing axis that extends along the horizontal direction in the longitudinal direction of the machine body. A swing arm 29 is arranged between the hook 21 and the support plate 24 . That is, the detection mechanism 28 is arranged adjacent to the lock mechanism 19 . The swing arm 29 is supported by the support shaft 32 so as to be swingable about the swing axis Y2, and is also supported by the support plate 24 via the support shaft 32. As shown in FIG. The swinging arm 29 is provided with an operated portion 29a to which the acting portion 20a pushes from above as the bonnet 10 swings toward the closing side.

A pin 33 extending in the front-rear direction is provided at a portion of the swing arm 29 on the side opposite to the operated portion 29a with respect to the swing axis Y2. The support plate 24 is formed with an elongated hole 24c through which the pin 33 is inserted. The elongated hole 24c is provided with an arcuate portion centered on the swing axis Y2.

That is, the swing arm 29 is configured to swing about the swing axis Y2 within an angular range in which the pin 33 can move within the elongated hole 24c. Here, regarding the swing position of the swing arm 29, the pin 33 has reached the lower end of the long hole 24c (the pin 33 is in contact with the portion of the support plate 24 along the lower end of the long hole 24c). is called a position corresponding to a state where the pin 33 does not act on the swing arm 29 (operated portion 29a) (hereinafter referred to as the "initial position"; see FIG. 7). The position in which the pin 33 has reached the upper end (the state in which the pin 33 is in contact with the portion of the support plate 24 along the upper end of the elongated hole 24c) is the position corresponding to the closed state of the bonnet 10 (hereinafter referred to as the "closed position"). (refer to FIG. 3).

The spring 30 urges the swing arm 29 to swing about the swing axis Y2 toward the side opposite to the closed position (that is, to the initial position side). The spring 30 is arranged on the rear side with respect to the support plate 24 . A spring 30 is provided across the pin 33 and the support plate 24 . The support plate 24 is provided with a hook portion 24d on which the spring 30 is hooked.

A detection switch 31 detects that the swing arm 29 is positioned at the closed position. The detection switch 31 is arranged between the frame 11 and the support plate 24 . The detection switch 31 is supported by the support plate 24 in the vicinity of the end (right end) of the swing arm 29 on the side opposite to the operated portion 29a. The detection switch 31 is provided with a lever 31a.

FIG. 4 shows the control configuration. This control configuration includes a control section 34 , an engine E, a key switch 17 and a detection switch 31 . The control unit 34 is configured to be able to receive a signal from the key switch 17, a signal from the detection switch 31, and other signals. When the detection mechanism 28 detects that the bonnet 10 is closed, the control unit 34 starts the engine E upon receiving a command from the key switch 17 . If the detection mechanism 28 does not detect that the bonnet 10 is closed, the control unit 34 does not start the engine E even if there is a command from the key switch 17 .

[Modes of operation of lock mechanism and detection mechanism]
As shown in FIG. 5, when the bonnet 10 is swung toward the closing side, the acting portion 20a enters the opening portion 11a and presses the acted portion 21a of the hook 21 from above. As a result, the hook 21 swings about the swing axis Y1 against the biasing force of the spring 22 toward the release position.

Next, the acting portion 20a pushes the operated portion 29a of the swing arm 29 from above. As a result, the swing arm 29 swings against the biasing force of the spring 30 around the swing axis Y2 to the closed position.

Then, when the acting portion 20a descends to a height position corresponding to the engaging groove 21b of the hook 21, the hook 21 swings about the swing axis Y1 toward the locked position by the biasing force of the spring 22. .

Finally, as shown in FIG. 6, the hook 21 is engaged with the action portion 20a through the engagement groove 21b and positioned at the lock position by the positioning portion 24b. That is, the lock mechanism 19 holds the bonnet 10 in a closed position.

In the state where the bonnet 10 is held closed by the lock mechanism 19, the swing arm 29 pushes the lever 31a of the detection switch 31 so that the swing arm 29 is positioned at the closed position. is detected by the detection switch 31 . That is, the detection mechanism 28 detects that the bonnet 10 is closed.

Here, as described above, when the detection mechanism 28 detects that the bonnet 10 is closed, the control unit 34 starts the engine E upon receiving a command from the key switch 17 .

Thereafter, as shown in FIG. 7, when the hook 21 is pivoted against the biasing force of the spring 22 by the release lever 27 to the release position about the pivot axis Y1, the engagement of the hook 21 with the action portion 20a is released. will be released. In other words, the bonnet 10 is released from being held in the closed position by the lock mechanism 19 .

When the bonnet 10 is swung to the open side in a state where the locking mechanism 19 is released from holding the bonnet 10 in the closed state, the acting portion 20 a moves upward from the acted portion 29 a of the swing arm 29 . will be spaced apart. As a result, the swing arm 29 is swung to the initial position about the swing axis Y2 by the biasing force of the spring 30, and the swing arm 29 is separated from the lever 31a of the detection switch 31. FIG. That is, the detection mechanism 28 does not detect that the swing arm 29 is positioned at the closed position.

Here, as described above, if the detection mechanism 28 does not detect that the bonnet 10 is closed, the control unit 34 does not start the engine E even if there is a command from the key switch 17 .

[Oil line structure for power steering device]
As shown in FIG. 8, a plurality of tubular members are provided across the power steering device 35 for the steering handle 15 and the hydraulic device (not shown). The plurality of tubular members includes a first tubular member 36 , a second tubular member 37 and a third tubular member 38 . The first tubular member 36 is provided with a soft (for example, rubber) first hydraulic hose 36a and a hard (for example, metal) first hydraulic pipe 36b. The first hydraulic hose 36a and the first hydraulic pipe 36b are connected via a first joint 36c. The second tubular member 37 includes a soft (eg, rubber) second hydraulic hose 37a and a hard (eg, metal) second hydraulic pipe 37b. The second hydraulic hose 37a and the second hydraulic pipe 37b are connected via a second joint 37c. The third tubular member 38 includes a soft (eg, rubber) third hydraulic hose 38a and a hard (eg, metal) third hydraulic pipe 38b. The third hydraulic hose 38a and the third hydraulic pipe 38b are connected via a third joint 38c.

The first joint 36 c , the second joint 37 c and the third joint 38 c are arranged inside the panel 18 . The first joint 36c, the second joint 37c, and the third joint 38c are provided in a state in which their vertical positions are displaced from each other. As a result, when tightening and loosening the first joint 36c, the second joint 37c and the third joint 38c with a tool in a narrow space such as the inside of the panel 18, the first joint 36c, the second joint 37c and the third joint 38c A space for inserting a tool can be secured without the adjacent one of them getting in the way.

[Another embodiment]
(1) In the above embodiment, the bonnet 10 is configured to swing open and close around the front fulcrum S1. However, the bonnet 10 may be configured to swing open and close around the rear fulcrum.

(2) In the above embodiment, the detection mechanism 28 is provided at a location corresponding to the rear portion of the bonnet 10 . However, the detection mechanism 28 may be provided at a location corresponding to the front portion of the bonnet 10 . In particular, when the bonnet 10 is configured to swing open and close around the rear fulcrum as in the above-described another embodiment (1), the detection mechanism 28 is provided at a location corresponding to the front portion of the bonnet 10. preferred.

(3) In the above embodiment, the detection mechanism 28 includes the shaft 20 , the swing arm 29 , the spring 30 and the detection switch 31 . However, the detection mechanism 28 is not limited to the configuration according to the above embodiment.

(4) In the above embodiment, the lock mechanism 19 includes the shaft 20 , the hook 21 and the spring 22 . However, the lock mechanism 19 is not limited to the configuration according to the above embodiment.

(5) In the above embodiment, the detection mechanism 28 is arranged adjacent to the lock mechanism 19 . However, the detection mechanism 28 may be arranged at a location other than the location adjacent to the lock mechanism 19 .

(6) In the above embodiment, the "detected portion" and the "engaged portion" according to the present invention are the same (shaft 20). However, the "to-be-detected portion" and the "to-be-engaged portion" according to the present invention may not be the same.

(7) It should be noted that the present invention is not limited to the above embodiment and other embodiments, and various other modifications are possible.

INDUSTRIAL APPLICABILITY The present invention can be applied not only to riding mowers but also to tractors having a working device at the rear of the machine body.

9 radiator 10 bonnet
11 frames
17 key switch (start command unit)
19 locking mechanism 20 shaft (detected part, engaged part)
21 Hook
24 support plate
28 detection mechanism 29 swing arm (swing member)
30 spring (biasing member)
31 detection switch 34 control unit E engine S1 front fulcrum Y1 swing axis Y2 swing axis

Claims (5)

engine and
a radiator that dissipates heat from the engine cooling water;
a bonnet that can be opened and closed by swinging about a front fulcrum and that accommodates the engine and the radiator ;
a plate-shaped frame provided on the outer periphery of the radiator and closing a gap around the radiator;
a detection mechanism for detecting an open/closed state of the bonnet;
a start command unit for commanding start of the engine;
and a control unit that controls the engine,
If the detection mechanism does not detect that the bonnet is closed, the control unit does not start the engine even if there is a command from the start command unit,
The detection mechanism is configured to be able to swing about a detection target portion provided at the rear portion of the bonnet and a swing axis extending along the horizontal direction, and the detection mechanism is configured to swing with the swing of the bonnet toward the closing side. a swinging member that pushes the detected part from above; and a detection switch that detects that the swinging member is positioned at a closed position corresponding to the closed state of the bonnet,
a support plate supported by the frame;
The work vehicle , wherein the rocking member and the detection switch are supported by the support plate . 2. The working vehicle according to claim 1 , wherein the detection mechanism has a biasing member that biases the swinging member about the swing axis in a direction opposite to the closed position. A lock mechanism is provided to hold the position of the bonnet in a closed state,
The work vehicle according to claim 1 or 2 , wherein the detection mechanism is arranged adjacent to the lock mechanism. The lock mechanism is configured to be swingable about a swing axis parallel to the engaged portion provided at the rear portion of the bonnet and the swing axis, and is capable of swinging to the closing side of the bonnet. a hook that engages with the engaged portion by pushing the engaged portion from above;
The working vehicle according to claim 3 , wherein the detected portion and the engaged portion are the same. The work vehicle according to claim 4, wherein the hook is supported by the support plate.

Images