JP3277731B2 - HST control device for vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle HST mounted with an HST (hydraulic power unit) and traveling at the output of the HST.
The present invention relates to a control device, and more particularly to a vehicle HST control device capable of quickly switching a manual operation lever to a neutral position in an emergency.

[0002]

2. Description of the Related Art In a heavy load HST, a servo mechanism is already built in, and it is not necessary to separately provide a mechanism for holding a swing position of a control lever. On the other hand, since the light load HST does not include a servo mechanism, a mechanism for separately holding the swing position of the control lever is required.

[0003] Japanese Utility Model Publication No. 6-30539 discloses an HST control device for a vehicle equipped with a heavy-load HST. In the HST control device, a control lever of the HST includes:
The swing of the manual operation lever is transmitted, and the cam roller is rotated when the brake pedal of the driver's seat is depressed when the manual operation lever is at a position other than the neutral position. At the base end, the central arc cam groove is shifted to the end side straight cam groove, and at this time, the straight cam groove is displaced from the inclined position to the horizontal position, and the manual operation lever is returned to the neutral position in the upright state. It has become.

[0004]

[Problems to be Solved by the Invention]
The HST control device disclosed in the publication is a control device for a heavy load HST. In the case of an HST control device that needs to hold the swing position of the control lever or the manual operation lever separately from the HST, the manual operation lever is moved to the neutral position in an emergency together with the manual operation lever swing position holding mechanism. When displacing, the holding position of the manual operation lever must be released together with the entrainment force of the manual operation lever, and the cam roller is simply introduced from the arc groove to the linear groove, and the manual operation lever is neutralized. Real fairness 6-305 in which only the entraining force acts on the position
The structure of the HST control device disclosed in Japanese Patent Publication No. 39 is difficult to adopt in an HST control device in which a swing position holding mechanism for the control lever must be separately prepared.

An object of the first and second aspects of the present invention is to provide a vehicle HST control device which requires a mechanism for holding a swinging position of a manual operation lever separately from the HST, and automatically moves the manual operation lever to the neutral position in an emergency. It is to switch.
An object of the third and fourth inventions is to provide a vehicle HST control device that can further improve safety.

[0006]

The present invention will be described with reference to the drawings corresponding to the embodiments. The vehicle HST control device (10) of the first invention has the following components (a) to (h). (A) HST (12) for moving the vehicle forward and backward (b) HST provided on HST (12) in relation to the turning position
A control lever (14) for changing the rotation direction and rotation speed of the output of (12) (c) a manual operation lever (16) that is pivotally operated by a driver to rotate the control lever (14) (d) tooth row (72) The tooth member (62) provided with the manual operation lever (16) and attached to the manual operation lever (16).
6) is locked in the swinging direction, and the swinging force exceeding the predetermined value of the tooth member (62) is pushed out from between the teeth of the tooth row (72) and slides along the tooth row (72). Stopping member (80) (f) Pressing member (84) for pressing locking member (80) against tooth row (72) (g) Engagement against pressing member (84) with depression of operation pedal (92) An unlocking member (86) for separating the stop member (80) from the row of teeth (72) (h) As the operation pedal (92) is depressed, the manual operation lever (1
6) entraining member (38) for entraining the control lever (14) to a neutral position corresponding to the neutral position

A vehicle HST control device (10) of the second invention has the following components (a) to (i). (A) HST (12) for moving the vehicle forward and backward (b) HST provided on HST (12) in relation to the turning position
A control lever (14) for changing the rotation direction and rotation speed of the output of (12) (c) a manual operation lever (16) that is pivotally operated by a driver to rotate the control lever (14) (d) tooth row (E) an arm (76) that swings back and forth toward the tooth member (62) and (f) attached to the arm (76). The manual operation lever (16) is locked in the swinging direction by fitting the tooth row (72) between the teeth, and the tooth member (6
The locking member (80) which is pushed out from between the teeth of the dentition (72) and slides along the dentition (72) for the swinging power exceeding the predetermined value of 2) is used. A pressing member (84) for pressing against the tooth member (62) (h) swings in conjunction with a stepping operation of the operation pedal (92) and moves the manual operation lever (16) to a neutral position corresponding to the neutral position of the control lever (14); The entraining member (38) entrained to the position (i) the tooth member (6) is rotated by interlocking with the swing of the entraining member (38).
Arm operating member (86) that displaces arm (76) in the direction away from 2)

A vehicle HST control device (10) according to a third aspect of the present invention
The vehicle HST control device (10) according to the first or second invention further includes the following components (a) and (b). (A) A detection switch (96) for detecting whether or not the operation pedal (92) is depressed; (b) a start of the prime mover for driving the HST (12); Start control means that is permitted only when stepping is detected
(98)

In the vehicle HST control device (10) of the fourth invention , the brake pedal (92) also serves as the operation pedal (92) in the vehicle HST control device (10) of the third invention .

[0010]

In the vehicle HST control device (10) of the first invention , the control lever (14) is rotated by the swing of the manual operation lever (16) to change the rotation position. , HST (12) change the rotation direction and rotation speed of the output,
Reverse, stop, and change running speed. The driver changes the running state of the vehicle through the swing operation of the manual operation lever (16). When the driver applies a moderately large swinging operation force to the manual operation lever (16), the locking member (80) is pressed against the pressing member (84) to form the tooth row (72) of the tooth member (62). It is pushed out from between the teeth and slides along the tooth row (72), and the manual operation lever (16) becomes swingable. The manual operation lever (16) is in the desired swing position,
As the driver releases the swing operation force on the manual operation lever (16), the locking member (80) is moved by the urging force of the pressing member (84), and the tooth row (72) of the tooth member (62) is released. And the tooth member (62) is locked, and the manual operation lever (16) is restrained at the changed swing position. Thus, the traveling direction and the traveling speed of the vehicle correspond to the swing position after the change of the manual operation lever (16).
When the driver steps on the operation pedal (92), the unlocking member (86)
Disengages the locking member (80) from the tooth member (62) against the pressing member (84), the locking of the tooth row (72) by the locking member (80) is released, and the manual operation lever (16 ) Becomes swingable. On the other hand, the entraining member (38) is displaced as the driver depresses the operation pedal (92), and entrains the manual operation lever (16) to the neutral position, and the output of the HST (12) becomes zero.

[0011] In the vehicle HST control device (10) of the second invention , the control lever (14) is rotated by the swing of the manual operation lever (16) to change the rotation position. , HST
(12) changes the rotation direction and rotation speed of the output, and the vehicle moves forward, backward, stops, and changes the traveling speed. The driver changes the running state of the vehicle through the swing operation of the manual operation lever (16). When the driver applies an appropriately large swing operation force to the manual operation lever (16), a pushing force acts from the tooth row (72) of the tooth member (62) to the locking member (80), and the arm (76) Swings against the pressing member (84), and the locking member (80)
Is pushed out from between the teeth of the tooth row (72), and slides along the tooth row (72), so that the manual operation lever (16) can swing freely. When the manual operation lever (16) is in the desired swing position and the driver releases the swing operation force on the manual operation lever (16), the arm is released.
(76) swings by the force of the pressing member (84), and the locking member (80)
Is fitted between the teeth of the tooth row (72) of the tooth member (62), and the tooth member (62)
And the manual operation lever (16) is restrained at the changed swing position. Thus, the traveling direction and the traveling speed of the vehicle correspond to the swing position after the change of the manual operation lever (16). When the driver steps on the operation pedal (92), the arm operation member (86) swings the arm (76) against the pressing member (84),
The locking member (80) is separated from the tooth member (62), and the locking member (80)
Lock of the tooth member (62) by the manual operation lever (1
6) becomes swingable. On the other hand, the entraining member (38) is displaced as the driver depresses the operation pedal (92), and entrains the manual operation lever (16) to the neutral position, and the output of the HST (12) becomes zero.

In the vehicle HST control device (10) of the third invention , the manual operation lever (16) is switched to the neutral position as the driver depresses the operation pedal (92). Detection switch
(96) detects the depression of the operation pedal (92), and starts control means.
(98) allows the starting operation of the prime mover only under the condition that the manual operation lever (16) is in the neutral position.

[0013] In the vehicle HST control device (10) of the fourth invention , as the driver depresses the brake pedal (92), the brake of the vehicle is actuated and the manual operation lever (16) is operated.
Is switched to the neutral position. The detection switch (96) detects depression of the brake pedal (92), and the start control means (98)
Only when the brake pedal (92) is depressed, that is, only when the brake of the vehicle is operated and the manual operation lever (16) is in the neutral position, the starting operation of the prime mover is permitted.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a front view of a main part of the HST control device 10, and FIG.
1 is an exploded view of the range of the manual operation lever 16 and the bracket 24 of FIG. 1 viewed from the left side direction of FIG. 1, and FIG. 3 is a plan view of the range of the manual operation lever 16 and the bracket 24 of FIG. The HST control device 10 is mounted on a relatively lightweight field self-propelled vehicle such as a speed sprayer or an aerator for a golf course. HST12 is installed in the power transmission of the self-propelled vehicle,
It is driven by an engine (not shown) as a prime mover. The control lever 14 is mounted on the HST 12 to change the angle of the swash plate of the HST 12 in relation to the turning position, and to change the rotation direction and rotation speed of the output of the HST 12 in relation to the turning position, that is, for the self-propelled vehicle. Forward, reverse, stop, and change running speed.

1 to 3, the manual operation lever 16 is shown.
Comprises, in order from the bottom, a lower portion 18, a leaf spring 20, and an upper portion 22.The upper and lower ends of the spring 20 are bolted to the lower end of the upper portion 22 and the upper end of the lower portion 18, respectively. , 64. The guide groove 23 (Fig. 3) is a manual operation lever.
16 at the position corresponding to the neutral position, and extends from this neutral position to the front (left side in FIG. 3) and rearward (right side in FIG. 3) stepwise, and the amount of forward extension is It is longer than the extension. The manual operation lever 16 penetrates the guide groove 23 in the upper portion 22 and
Due to the elastic deformation at 20, the guide groove 23 can be moved to the forward side and the backward side via the bent portion of the guide groove 23.
As will be described later, when the manual operation lever 16 is in the neutral position in the guide groove 23, the control lever 14 is also in the neutral position, the output of the HST 12 becomes zero, and the manual operation lever 16 advances from the neutral position in the guide groove 23. When the control lever 14 is moved in the forward and reverse directions, the control lever 14 rotates in the forward and reverse directions with respect to the neutral position, respectively, and the output of the HST 12 rotates in the forward and reverse directions. Further, the rotation speed of the output of the HST 12 increases as the manual operation lever 16 moves away from the neutral position in the guide groove 23.

The bracket 24 is fixed to a frame (not shown), and protrudes the shaft 26 in the left-right horizontal direction. The shaft portion 26 passes through the bush 28, the lower end portion of the lower portion 18, the bush 30, and the washer 32, and then the retaining ring 34 is fixed to the distal end portion. As a result, the manual operation lever 16 can swing around a fulcrum 36 formed by the shaft portion 26. The entrainment bracket 38
A shaft portion 40 extending in parallel with the shaft portion 26 is integrally provided, and the shaft portion 40 is
Bush 42, upper end of bracket 24, bush 44, and washer
After passing through 46, the retaining ring 48 is fastened at the tip,
As a result, the entrainment bracket 38 is connected to the fulcrum 50
Is supported by the upper end of the bracket 24 so as to be swingable around. The return plate 52 has upper and lower return pins 54 and 56 vertically projecting left and right toward the entrainment bracket 38,
The upper and lower return pins 54, 56 are inserted into the upper and lower windows 58, 60 of the entrainment bracket 38, respectively. The sector 62 is sandwiched between the upper end of the lower portion 18 and the return plate 52, and two bolts 64 are inserted from the leaf spring 20 side into the upper end of the lower portion 18, the sector 62, and the return plate 52. Being fixed to each other. The link rod 68 has a front end rotatably connected to an intermediate portion of the lower portion 18 by a bolt 70, a rear end rotatably connected to the control lever 14, and a manual operation lever 16.
The control lever 14 is displaced in the front-rear direction with the swing of the control lever 14 to rotate. As a result, the control lever 14 is turned to a rotation position corresponding to the swing position of the manual operation lever 16.

The sector 62 has a sector shape, and the tooth row 72 has a fulcrum.
It is formed along the arc-shaped upper edge of the sector 62 centered at 50 and has a flat portion 74 at the center. The locking arm 76
A locking pin 80 is fitted on the shaft of the bolt 77 and is rotatably supported around a fulcrum 78 made of the bolt 77 and protrudes in a horizontal direction at a predetermined distance from the fulcrum 78.
The locking pin 80 is freely fittable from above into the space between the teeth of the tooth row 72, and locks the sector 62 in the swinging direction when fitted. The stay 82 is fixed to the frame, the compression coil spring 84 is contracted between the upper wall of the stay 82 and the upper surface of the locking arm 76,
The locking arm 76 is urged downward. The bell crank 86 is disposed below the locking arm 76, and is connected to the stay 82 via a shaft 88.
And a portion that is rotatably coupled to the lower end of the lock arm and abuts against the lower surface of the locking arm. The relay rod 90 is rotatably connected to the eccentric portions of the entrainment bracket 38 and the bell crank 86 at both ends, and is displaced with the swinging displacement of the entrainment bracket 38 to swing the bell crank 86 around the shaft 88. Move.

The brake pedal 92 is provided at the foot of the driver's seat and operates the brake of the self-propelled vehicle when depressed. The depression of the brake pedal 92 is also transmitted to the entrainment bracket 38 via the wire 94 to swing the entrainment bracket 38. The safety switch 96 detects whether or not the brake pedal 92 is depressed.
The start of the driving engine of the HST 12 is controlled based on the input from 96.

The operation of the HST control device 10 will be described. The driver swings the manual operation lever 16 by hand while sitting on the driver's seat. When the swing operation force from the driver is not acting on the manual operation lever 16, the locking arm 76 is biased downward around the fulcrum 78 by the biasing force of the compression coil spring 84, and the locking pin 80 is , Fit between the teeth of the dentition 72, the sector 62
Are locked in the swinging direction. Sector 62 is a manually operated lever
Since it is fixed to 16, the manual operation lever 16 holds the swing position.

When the driver applies an operating force in the swinging direction to the manual operation lever 16, the sector 62 attempts to displace with respect to the locking pin 80, and an upward force acts on the locking pin 80 from the tooth row 72. Then, the locking arm 76 swings upward around the fulcrum 78,
The locking pin 80 comes out of the tooth row 72 between the teeth. Thus, while the teeth row 72 slides on the locking pin 80, the sector 62 is displaced with respect to the locking pin 80, and the manual operation lever 16 swings. As the driver releases the swing operation force of the manual operation lever 16, the locking pin 80 is re-inserted between the teeth of the tooth row 72 by the urging force of the compression coil spring 84, and the manual operation lever 16 is changed. It is held in the later swing position. The flat portion 74 is formed at the center of the tooth row 72, and near the standing position of the manual operation lever 16, the locking pin 80
However, it fits in the flat portion 74 and is continuously movable in the flat portion 74, and the proper movement of the locking pin 80 in the flat portion 74 ensures that the control lever 14 is correctly in the neutral position.

FIG. 4 shows the positional relationship between the locking pin 80 and the tooth row 72 when the manual operation lever 16 is at the predetermined swing position on the forward side. The upper and lower return pins 54 and 56 of the return plate 52 are located in the upper and lower windows 58 and 60 of the entrainment bracket 38, and the upper and lower return pins 52 and It is displaced relative to the side windows 58 and 60. The link rod 68 is displaced in the front-rear direction with the swing of the manual operation lever 16 around the fulcrum 36, and rotates the control lever 14. The control lever 14 is in the neutral position when the manual operation lever 16 is in the neutral position, the output of the HST 12 is zero, and the manual operation lever 16 is moved forward and backward in the guide groove 23 with respect to the neutral position. When in the movement position, the control lever 14 is also in the forward and backward rotation positions with respect to the neutral position, and the output of the HST 12 rotates in the forward and backward directions, and the self-propelled vehicle moves forward and backward. Go backwards. Manual operation lever
The more the 16 is in the swinging position away from the neutral position, the more the control lever
14 rotates largely with respect to the neutral position, the rotation speed of the HST 12 increases, and the forward speed or the reverse speed of the self-propelled vehicle increases.

When the driver steps on the brake pedal 92, the wire 94 is displaced, and the entrainment bracket 38 rotates around the fulcrum 50. On the other hand, with the rotation of the entrainment bracket 38 about the fulcrum 50, the relay rod 90 is displaced, and the bell crank 86 rotates around the shaft portion 88. The locking arm 76 is lifted by the bell crank 86 against the urging force of the compression coil spring 84 with the rotation of the bell crank 86, and the locking pin 80 is pushed out from between the teeth of the tooth row 72, The manual operation lever 16 is in the swing allowable state.

FIG. 5 shows a state in which the upper return pin 54 is driven by the driving bracket 38 when the brake pedal 92 is depressed. The entrainment bracket 38 swings when the brake pedal 92 is depressed, but when the manual operation lever 16 is at the forward position, the lower return pin 56 and the lower window 60 The left edge of the upper window 58 abuts on the upper return pin 54 while leaving a predetermined gap between the upper window 58 and the left edge (the upper and lower return pins 54 and 56 indicated by solid lines in FIG. 5 correspond to each other). ), The upper return pin 54 is pulled backward, and the manual operation lever 16 is set to the neutral position. Also, the manual operation lever
When 16 is in the reverse position, a predetermined gap is left between the upper return pin 54 and the right edge of the upper window 58 with the swing of the entrainment bracket 38, and the right edge of the lower window 60 is The lower return pin 56 is brought into contact with the lower return pin 56 (the upper and lower return pins 54 and 56 in the two-dot chain line correspond to each other in FIG. 5), and the lower return pin 56 is pulled forward, and the manual operation lever 16 is neutral. Position. When the brake pedal 92 is released, the entrainment bracket
The wire 38 is returned from the tilted state to the neutral position in FIG. 1 again by the wire 94.

On the other hand, the safety switch 96 is
Detects stepping on The start control device 98 is a safety switch
Based on the input from 96, only when the brake pedal 92 is depressed, that is, the manual operation lever 16 is always in the neutral position, and when the brake pedal 92 is depressed, the brake of the self-propelled vehicle is activated. H only during the period
The start of the drive engine in ST12 is permitted.

In the embodiment, the brake pedal 92 is connected to the wire 94
The operation bracket 38 is operated via the brake pedal 92.A separate operation pedal dedicated to the operation of the entrainment bracket 38 is provided side by side with the brake pedal 92, separately from the brake pedal 92. The entrainment bracket 38 may be connected to operate the entrainment bracket 38 by depressing the operation pedal.

[0026]

According to the first and second aspects of the present invention, in an HST control apparatus for a vehicle which needs to be equipped with a mechanism for holding a swinging position of a manual operation lever outside the HST, a driver depresses an operation pedal. , The manual operation lever can be automatically switched to the neutral position, and the HST can be quickly and reliably set to the neutral position in an emergency.

In the third invention , the operation pedal is depressed,
Only when the manual operation lever automatically shifts to the neutral position and the HST is at the neutral position, the starting of the prime mover that drives the HST is permitted, so that the safety at the time of starting the prime mover can be improved.

In the fourth invention , the HST is driven only when the brake pedal is depressed, the brake of the vehicle is operated, and the manual operation lever is automatically set to the neutral position and the HST is at the neutral position. Since the starting of the prime mover is permitted, safety at the start of the prime mover can be improved.

[Brief description of the drawings]

FIG. 1 is a front view of a main part of an HST control device.

FIG. 2 is an exploded view of a range of a manual operation lever and a bracket of FIG. 1 as viewed from a left side direction of FIG. 1;

FIG. 3 is a plan view of a range of a manual operation lever and a bracket of FIG. 1;

FIG. 4 is a view showing in detail a positional relationship of a locking pin, a tooth row, and the like when the manual operation lever is at a predetermined swing position on the forward side.

FIG. 5 is a diagram showing a state in which an upper return pin is entrained by an entrainment bracket when the brake pedal is depressed.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 HST control apparatus (HST control apparatus for vehicles) 12 HST 14 Control lever 16 Manual operation lever 38 Entrainment bracket (entrainment member) 62 Sector (tooth member) 72 Teeth row 76 Locking arm (arm) 80 Locking pin (Locking) 84) Compression coil spring (pressing member) 86 Bell crank (unlocking member, arm operating member) 92 Brake pedal (operating pedal) 96 Safety switch (detection switch) 98 Start control device (start control means)

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16H 61/38-61/46 B60K 20/00-20/06

Claims (3)

(57) [Claims] 1. A (a) HST for forward and backward of the vehicle (12), the rotation direction and the rotation speed of the output of the (b) said related to provided rotational position to the HST (12) HST (12) The control lever (14) to be changed; (c) the control lever (14) which is swingably operated by a driver.
(D) Tooth member (62) provided with a row of teeth (72) and attached to the manual operation lever (16); (e) Toward the tooth member (62) Arm that swings back and forth freely
(76), (f) The manual operation lever (16) is locked in the swinging direction by being fitted to the arm (76) between the teeth of the tooth row (72), and the tooth member (62) is A locking member (80) which is pushed out from between the teeth of the tooth row (72) and slides along the tooth row (72) with respect to a swinging power of a predetermined value or more, (g) the arm (76) A pressing member (84) which presses the manual operation lever (16) against the tooth member (62), and (h) swings in conjunction with the depression operation of the operation pedal (92) to move the manual operation lever (16) to the neutral position of the control lever (14). An entraining member (38) entrained to a neutral position corresponding to the position, and (i) the arm (38) pivots in conjunction with the swing of the entraining member (38) to rotate away from the tooth member (62). An HST control device for a vehicle, comprising: an arm operation member (86) for displacing the (76). 2. A detection switch (96) for detecting whether or not the operation pedal (92) is depressed, and (b) a detection switch for starting the prime mover for driving the HST (12). 2. An HST control device for a vehicle according to claim 1 , further comprising a start control means (98) for permitting only when the operation pedal (96) detects depression of the operation pedal (92). 3. The brake pedal (92) is connected to the operation pedal (9).
3. The HST control device for a vehicle according to claim 2, wherein the control also serves as (2).