JPH0640264A - Cruise control device - Google Patents

Abstract

PURPOSE:To constitute a cruise control device enabling an operator to operate easily with a simple constitution and release cruise control positively in a traveling vehicle mounted with a continuously variable transmission such as an HST- type transmission gear and allowed to perform cruise control for keeping the speed constant after the start. CONSTITUTION:An HST pedal 1 (or a cruise control lever 3) is additionally provided with a friction plate 7 so as to have such a constitution that cruise control can be performed by the braking force of the friction plate 7 and that the cruise control can be released only by depressing a break pedal 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a cruise control device capable of traveling at a fixed speed in a traveling vehicle equipped with a continuously variable transmission such as an HST type transmission.

[0002]

2. Description of the Related Art Conventionally, in a traveling vehicle such as a tractor equipped with an HST type transmission device, a technique relating to a cruise control device for keeping a vehicle speed constant is known. For example, a structure in which an HST pedal and a cruise control lever are separately provided to adjust the speed by the cruise control lever when traveling at a constant speed, or an HS
The structure is such that when the T-pedal is stepped on, the cruise control lever is operated to hook the claw on the HST pedal to fix it.

[0003]

However, in the above-mentioned prior art, the structure in which the HST pedal and the cruise control lever are separately provided is complicated in structure, so that the weight is heavy, the number of parts is large, and the weight is reduced. It is disadvantageous in terms of cost and cost, and the structure that fixes with the claw can set the speed only in stages, and it is troublesome and comfortable for the operator to operate the cruise control lever while stepping on the HST pedal with the foot. It is not a proper operation.
Further, for safety reasons, the cruise control device needs a mechanism for releasing the cruise control when the brake pedal is depressed. Therefore, an object of the present invention is to construct a cruise control device that can be easily operated by an operator with a simple structure and can reliably release cruise control.

[0004]

As means for solving the above problems, the present invention is equipped with a continuously variable transmission such as an HST type transmission, and can maintain a constant speed after starting. In a traveling vehicle, a rotating shaft is provided on a machine body through a supporting member, and a boss portion integrated with a brake pedal and a boss portion integral with a cam are fixedly mounted on the rotating shaft, and an HST is provided on an outer periphery of the supporting member.
A rotary member integral with the pedal is pivotally provided, a friction plate is attached to the rotary member, and a sliding member that abuts the friction plate and meshes with the cam is disposed on the rotary shaft, A cruise control lever is connected to a member, and a spring over a fulcrum is provided on the cruise control lever. Also, a pivot shaft is fixed to the machine body, and the pivot shaft integrally rotates with the cruise control lever. A member is pivoted, a friction plate is attached to the rotating member, a release boss is urged to the friction plate via a spring, a pin is projected to the release boss, and a brake pedal and a rod are attached to the pin. The connected arms are in contact with each other.

[0005]

Operation When the cruise control is performed by the HST pedal 1, when the cruise control lever 3 is set to the "ON" position A, the sliding member 4 connected to the cruise control lever 3 rotates. The friction plate 7 is slid on the shaft 5, meshes with the cam 4 on the rotating shaft 5, and presses the friction plate 7.
By the braking force of, the rotation member 8 on the support member 18 of the rotation shaft 5 integrated with the HST pedal 1 is fixed, and the HST pedal 1 is held in the depressed position, so that the speed is kept constant. To be drunk. When the brake pedal 2 is stepped on, the boss portion 9 on the rotary shaft 1 integral with the brake pedal 2 rotates, the cam 6 operates via the rotary shaft 1, and the sliding member 4 cruises. When the cruise control lever 3 is pushed to a position beyond the fulcrum of the control lever 3, the cruise control lever 3 is moved to the “OFF” position B by the bias of the spring 10, and the friction plate 7 is released.
The pedal 1 returns to the neutral position by the action of the return spring provided in the HST pedal 1, and the cruise control is released.

In the latter case, when the cruise control lever 3 is used for cruise control and the cruise control lever 3 is rotated,
Since the friction plate 17 is pressed against the rotating member 12 on the pivot shaft 15 integrated with the cruise control lever 3 via the release boss 11 biased by the spring 32, the braking force of the friction plate 17 , Cruise control lever 3
Is held at an arbitrary position. When the brake pedal 2 is stepped on, the rod 1 is attached to the brake pedal 2.
The arm 14 connected via 3 pushes down the pin 16 inserted in the release boss 11 within the range of the elongated hole 15a of the pivot shaft 15 and slides the release boss 11 downward, thereby causing friction. Since the braking force of the plate 17 can be adjusted, the cruise control lever 3 held at any position can be freely moved to any position by an external force such as a return spring.

[0007]

EXAMPLES Next, examples of the present invention will be described. Figure 1
Is a side view of the entire tractor T, FIG. 2 is a cross-sectional view of a cruise control lever portion showing a first embodiment of the present invention, and FIG. 3 is a cross-sectional view of the cruise control lever 3 in the “OFF” state, FIG. 4 is a front sectional view showing a second embodiment of the present invention, FIG. 5 is a side sectional view of the same, and FIG.
Is a plan view showing another embodiment, FIG. 7 is a side view of the same,
8 is an enlarged sectional view of the lock arm 40 portion of FIG. 7, FIG.
FIG. 7 is an enlarged view of the control arm 50 section.

An embodiment of the present invention is shown in FIG.
To explain, the front wheel 21.2 is attached to the tractor T.
1, rear wheels 22 and 22 are provided, and an engine or the like is provided in the front hood 23. The cruise control lever 3 and the steering 24, which are the main parts of the present invention, are arranged at the rear of the bonnet 23, and below the steering 24, the main part H of the present invention is provided.
An ST pedal 1 and a brake pedal 2 are provided, and a driver's seat 25 is provided behind them.

Referring to FIGS. 2 and 3, a first embodiment of the present invention will be described. A support member 18 is fixedly mounted on a body 20 of a tractor T, and the support member 18 has a rotating shaft. 5 is rotatably inserted. A boss 9 integral with the brake pedal 2 is fixed to one end of the rotary shaft 5 by a pin 28, and a boss 19 integral with the cam 6 is fixed to the other side by a pin 29. The boss portion 9 and the boss portion 19
Are arranged at both ends of the support member 18. A rotating member 8 integrated with the HST pedal (speed change pedal) 1 is provided in a substantially central portion of the support member 18 and in the vicinity of a fixed portion with the machine body 20.
And a friction plate 7 is provided on the side surface of the rotating member 8.
7 is attached.

The rotating shaft 5 meshes with the cam 6,
The sliding member 4 that presses the friction plate 7 and encloses the boss portion 19 is slidably arranged in a state in which it cannot be rotated by a stopper provided on the machine body side. Has an engaging member 26 fixed thereto, and the tip of a cruise control lever 3 pivotally supported by a fulcrum shaft 27 is inserted into the engaging member 26. The spring 10 is attached. Due to the biasing of the spring 10, as shown in FIG.
When the cruise control lever 3 is set to the “ON” position A, the sliding member 4 meshes with the cam 6 and presses the friction plate 7, so that the rotating member 8 causes the rotating member 8 to move by the friction force with the friction plate 7. Therefore, the sliding member 4 keeps it from rotating. Further, as shown in FIG. 3, when the cruise control lever 3 is rotated to the “OFF” position B, the braking of the friction plate 7 is released, and the HST pedal 1 operates as a return spring provided on the HST pedal 1. It tries to return to the neutral position by the work.

In the above structure, when the cruise control lever 3 is set to the "ON" position A while the HST pedal 1 is stepped on, the rotating member 8 on the outer periphery of the support member 18 is provided.
Is braked by the friction plate 7, fixed at the position where the HST pedal 1 is depressed, and cruise control can be performed in which the speed is kept constant. When the cruise control lever 3 is in the “ON” position A, the HS
The constant speed can be adjusted by depressing the T-pedal 1.

When the brake pedal 2 is stepped on, the boss portion 9 is rotated, the rotating shaft 5 fitted and fixed to the boss portion 9 is rotated, the boss portion 19 is also rotated, and the cam 6 is rotated. Moved,
The cam portion 4a in the sliding member 4 meshing with the cam 6 slides laterally so as to be spread out, and the sliding member 4 is pushed out to a position beyond the fulcrum of the cruise control lever 3 for the cruise control. Lever 3 is spring 1
With the bias of 0, the friction plate 7 is released as well as the "off" position B, the HST pedal 1 is returned to the neutral position by the action of the return spring, and the cruise control is released. In this way cruise control
Lever 3 can be turned on and off, and H
A constant speed can be adjusted by the ST pedal 1 and can be released by the brake pedal 2.

Referring to FIGS. 4 and 5, the second embodiment of the present invention will be described. The pivot shaft 15 is fixed to the body 30 of the tractor T, and in the vicinity of the body 30 of the pivot shaft 15, A turning member 12 integrated with the cruise control lever 3 is pivotally supported, and the cruise control lever 3 is connected to a speed changing arm of the HST transmission H through an arm 31 or the like protruding from the turning member 12. It is connected. Friction plates 17, 17 are attached to both sides of the rotating member 12, and one of the friction plates 17 can come into contact with the release boss 11.

The release boss 11 is slidable on the pivot shaft 12, and is biased toward the friction plate 17 by a spring 32. The pivot 1 according to the sliding position of the release boss 11
5, an elongated hole 15a is opened, and a pin 16 is inserted through the elongated hole 15a and the release boss 11 to remove the pin 16
Is fixed to the release boss 11. Arms 14 and 14 are brought into contact with both ends of the pin 16, the centers of the arms 14 and 14 are fixedly mounted on the support shaft 57, and the other end is connected to the brake pedal 2 via the rod 13, An arm 58 is fixedly installed in the vehicle, and the arm 58 is connected via a rod or the like to a brake cam arm protruding from the mission case to enable braking.

In the structure for performing cruise control by the cruise control lever 3 as described above, when the cruise control lever 3 is turned, the turning member 12 on the pivot shaft 15 releases the spring 32 biased by the turning member 12. Since the friction plate 17 is pressed through the boss 11,
By the braking force of the friction plate 17, the cruise control lever 3 is held at an arbitrary position and the speed can be kept constant.

When the brake pedal 2 is depressed,
The arm 14 connected to the brake pedal 2 pushes the pin 16 inserted into the release boss 11 within the long hole 15a of the pivot shaft 15 and slides the release boss 11, thereby causing the friction plate 17 to slide. Since the braking force of the cruise control lever 3 can be adjusted, the cruise control lever 3 held at an arbitrary position can be freely moved to an arbitrary position by an external force such as a return spring, and the speed can be changed. Yes, you can also cancel cruise control,
You can also stop running.

Next, referring to FIGS. 6 and 7, another embodiment will be described. The HST pedal 1 includes a forward drive 1F and a reverse drive 1F.
R is provided, and the forward HST pedal 1F and the reverse HST pedal 1R are fixedly mounted on rotary members 34F and 34R on the pivot 33, respectively, and a rotary arm 35F and a rotary arm 35F.
The rotary arm 35 is connected to the support member 54 of the HST control arm 50 via 35R and rods 36F and 36R, and a concave portion 35a is provided at the tip of the rotary arm 35. The brake pedal 2 is fixed to a brake shaft 37, an end portion of the brake shaft 37 is fixed to a supporting member 49, and the supporting member 49 has an inverted L-shaped locking member 3 in a plan view.
9 and the operating member 41 are provided so as to project.

A lock arm 40 is rotatably disposed above the locking member 39 and is biased upward (release direction) by a spring 60. A parking lever 42 is erected on the lock arm 40. When the HST pedal 1 is in the neutral position and the brake pedal 2 is depressed, the parking lever 42 is rotated to move the parking lever 42 as shown in FIG.
The shaft 42a of the rotary arm 35 is fitted into the recess 35a of the rotary arm 35, and the engaging portion 40a of the lock arm 40 and the upper end portion of the locking member 39 are engaged with each other, so that the brake pedal 2 is moved to the depressed position. It can be locked.

The locking member 39 is urged by a spring 44 via a rod 43, and the actuating member 41 is urged by a spring 45 so that the neutral position is inclined. When you depress, the brake shaft 3
The actuating member 41 is rotated via 7 and comes into contact with the switch 46 of the brake lamp. An arm 48 connected to the cruise control lever 3 is also connected to the connecting portion between the rod 43 and the spring 44. The arm 48 includes a braking member 59 on a pivot shaft 51.
The control arm 47 is pivoted integrally with the control arm 47, and the cruise control lever 3 is erected on the control arm 47. A lower end portion of the cruise control lever 3 is projected from a connecting portion of the control arm 47, and the protruding portion 3a can be brought into contact with a tip end portion of the HST control arm 50.

The HST control arm 50 is fixed to a supporting member 54 with bolts 56 and 56, is pivotally supported together with the supporting member 54 on a rotating shaft 61, and is connected to a swash plate of an HST transmission. The lower end of the HST control arm 50 is formed in a concave shape, and a roller 52 pivotally supported at the tip of the support arm 55 is brought into contact with the roller 52, and the roller 52 is biased toward the HST control arm 50 side by a spring 53. The HST control arm 50 is maintained at the neutral position by the roller 52, and by pressing the forward HST pedal 1F and the backward HST pedal 1R, the HST control arm 50 is rotated back and forth through the support member 54. , The cruise control lever 3 is operated, and as shown in FIG.
By abutting and fixing the protrusion 3a of the HST control arm 50 to the tip of the HST control arm 50, cruise control for keeping the speed constant can be performed.

When the cruise control is released, the brake pedal 2 is stepped on and the control arm 47 is rotated rearward through the rod 43 of the locking member 39 and the arm 48 to move the cruise control lever 3. The HST control arm 50 is rotated to the neutral position, and the HST control arm 50 is returned to the neutral position by the roller 52 biased by the spring 53. The cruise control lever 3 has a braking member 5
The cruise control lever 3 can be fixed at any position by means of the arm 9, and the cruise control lever 3 can be fixed to the stopper 62 shown in FIG.
The speed can be kept constant at an arbitrary position by rotating within the range in which 8 abuts.

[0022]

Since the present invention is constructed as described above,
The following effects are achieved. That is, with the configuration according to claim 1, the operator can easily operate, the work efficiency can be improved, the number of parts is small, and the structure is simple.
The cost can be reduced and it is also advantageous in terms of maintenance. Further, according to the second aspect of the present invention, the cruise control can be reliably released only by depressing the brake pedal, and the compact structure can reduce the cost. .

[Brief description of drawings]

FIG. 1 is an overall side view of a tractor T.

FIG. 2 is a sectional view of a cruise control lever portion showing a first embodiment of the present invention.

[Fig. 3] Similarly, the cruise control lever 3 is "OFF"
It is a cross-sectional view of the state.

FIG. 4 is a front sectional view showing a second embodiment of the present invention.

FIG. 5 is a side sectional view of the same.

FIG. 6 is a plan view showing another embodiment.

FIG. 7 is a side view of the same.

8 is an enlarged cross-sectional view of the lock arm 40 portion of FIG.

FIG. 9 is an enlarged view of the control arm 50 portion.

[Explanation of symbols]

 1 HST pedal 2 Brake pedal 3 Cruise control lever 4 Sliding member 5 Rotating shaft 6 Cam 7, 17 Friction plate 8, 12 Rotating member 11 Release boss

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shuhei Hirata 1-32, Chayamachi, Kita-ku, Osaka-shi, Osaka Yanma Agricultural Machinery Co., Ltd.

Claims (2)

[Claims] 1. In a traveling vehicle equipped with a continuously variable transmission and capable of maintaining a constant speed, a rotation shaft is pivotally supported by a support member, and the rotation shaft is rotated integrally with a brake pedal. A boss and a cam are provided, a rotating member integral with the HST pedal is pivotally provided on the outer periphery of the supporting member, and a friction plate is attached to the rotating member.
A sliding member, which abuts on the friction plate and meshes with the cam, is arranged on a rotary shaft, a cruise control lever is engaged with the sliding member, and a spring beyond a fulcrum is provided on the cruise control lever. Cruise control device. 2. In a traveling vehicle equipped with a continuously variable transmission and capable of maintaining a constant speed, a pivot shaft is fixedly mounted on the machine body,
A pivot member integral with the cruise control lever is pivotally mounted on the pivot shaft, a friction plate is attached to the pivot member, and a release boss is urged by a spring on the friction plate. A cruise control device characterized in that the arm is brought into contact with the arm so that the arm protrudes and is connected to a brake pedal.