JPH09254753A - Parking brake for self-traveling vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent abrupt stop or breakage of a parking brake by automatically actuating the parking brake after a lapse of a time required for reducing a speed to a speed, at which the parking brake can be operated without any hindrance, from the time when a travel transmission gear is set in a neutral gear. SOLUTION: When a joy stick (j) is operated into a neutral position, a signal indicating this operation is emitted from a joy stick controller cj, and on the basis of an output from a controller C receiving this signal, a hydraulic travel transmission gear is set in a neutral gear. At the same time, electric current flow to a parking brake releasing solenoid (s) is cut off after a lapse of time necessary for reducing a tracked vehicle traveling speed to a speed at which a parking brake B can be operated without any hindrance, and as a result, the parking brake B is actuated automatically. In this way, abrupt stop or breakage of the parking brake B can be prevented.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a parking brake for a self-propelled vehicle.

[0002]

2. Description of the Related Art Conventionally, in a self-propelled vehicle, a self-propelled vehicle with improved safety by automatically operating a parking brake when the traveling transmission is operated in a neutral state to maintain the stopped state of the vehicle. There is a parking brake for the vehicle.

Further, in a self-propelled vehicle equipped with a hydraulic traveling transmission, even when the traveling transmission is neutrally operated, the parking brake is automatically actuated to cause a hydraulic lock failure. , There is a parking brake designed to ensure safety by maintaining the stopped state of the vehicle.

In particular, since a remote-controlled self-propelled vehicle is operated away from the vehicle, there are some vehicles which use the above parking brake for safety and easy operation.

[0005]

However, in the above parking brake, if the parking brake is actuated immediately after the traveling transmission becomes neutral, the parking brake is actuated at a high speed, and the vehicle suddenly moves. There was a problem that it stopped or the parking brake was overloaded and damaged.

[0006]

Therefore, in the present invention, the vehicle is equipped with a traveling transmission and a parking brake, and the speed is reduced from the time when the traveling transmission is set to neutral to a speed at which the parking brake is not affected. It is intended to provide a parking brake for a self-propelled vehicle, which is characterized in that the parking brake is automatically actuated after the time required for the passage of time elapses.

[0007]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a tracked vehicle A equipped with a parking brake for a self-propelled vehicle according to the present invention. The tracked vehicle A as a self-propelled vehicle is located below a frame-shaped body frame 1 in the front, rear, left and right directions. Side left and right running parts 15F, 15
R is installed, on the upper surface of the body frame 1, a work unit 2 that can be attached and detached and replaced at the front end is mounted, and a substantially box-shaped body cover 3 is mounted from the rear to the rear end of the work unit 2. The driving section 4, the functional section 5, and the prime mover section 6 are arranged in the vehicle body cover 3 from the front in the above order.

Each of the traveling parts 15F and 15R has a hydraulically driven drive wheel 8 pivotally supported at one end of the traveling part frame 7 and an idler wheel 9 at the other end thereof. A plurality of lower rolling wheels 10 are arranged in the vehicle, and crawler belts 11 are wound around these outer wheels, and the power from the engine E arranged in the prime mover section 6 is transmitted to the driving wheels 8 via the hydraulic traveling transmission H. Therefore, the tracked vehicle A is made to travel. The front traveling section 15F is arranged with the drive wheels 8 rearward, and the rear traveling section 15R is arranged with the drive wheels 8 frontward.

The traveling section frame 7 of each of the traveling sections 15F and 15R
On the upper surface, pivot parts 14 are respectively provided to project, and front and rear running part support frames 12 and 13 extending in the left and right directions are arranged in the lower front and rear parts of the vehicle body frame 1, respectively. The running portions 15F, 15R are pivotally attached to the left and right end portions of the through the pivotal attachment portion 14 so as to be respectively swingable about an axis line in the left-right direction.

The front traveling portion support frame 12 is pivotally attached to the vehicle body frame 1 through a plurality of cushion rubbers 17, and the rear traveling portion support frame 13 is the same as the rear traveling portion support frame 13. Is pivotally attached to the body frame 1 about a pivot 16 which is inserted through the central portion of the vehicle in the front-rear direction.

With this suspension structure, when the tracked vehicle A travels, the traveling parts 15F and 15R can independently swing around the axis line in the left-right direction.
Since the ground contact between the road surface and each of the running parts 15F and 15R is improved and the stability of the vehicle body is high, it is possible to ride over rough terrain as well as obstacles such as stairs and steps.

FIG. 2 shows a hydraulic traveling transmission device H. The hydraulic traveling transmission device H is connected to an engine E arranged in a prime mover section 6 by interlocking variable displacement left and right hydraulic pumps PL, PR. Then, the left and right hydraulic pumps PL, PR are connected to the constant displacement left and right hydraulic motors ML, MR which are interlockingly connected to the left and right drive wheels 8, respectively, so that the tracked vehicle A can be driven forward and backward and steplessly. I have to.

FIG. 3 shows a parking brake system S. The parking brake system S is provided on the output side of a joystick controller CJ via a controller C, and a parking brake release solenoid s interlocked with a parking brake B.
Are connected.

When the joystick j is operated to the neutral position, the joystick controller CJ
A signal to this effect is transmitted from the hydraulic traveling transmission H by the output from the controller C that receives this signal.
And the required time, that is, the traveling speed of the tracked vehicle A is reduced to a speed at which the parking brake B is not impaired, and the energization of the parking brake release solenoid s is cut off. I am trying to do it.

By this operation, while the tracked vehicle A is traveling,
Even if the hydraulic traveling transmission H becomes neutral, the parking brake B starts to operate after waiting until the traveling speed has decreased to such an extent that the parking brake B can be operated. B is prevented from operating, and sudden stop and damage to the parking brake B are prevented.

Further, since the parking brake B is automatically actuated while the vehicle is stopped with the hydraulic traveling transmission H being in neutral, the remote operation of the parking brake B is facilitated and the safety is improved. it can.

As shown by the alternate long and short dash line in FIGS. 2 and 3, the hydraulic traveling transmission H is provided with a neutral sensor SN, which is connected to the controller C. After the neutral signal from the sensor SN is input, Wait for the above time to elapse,
The energization of the parking brake release solenoid s may be cut off.

It is also possible to provide a vehicle speed sensor for detecting the traveling speed of the tracked vehicle A, and to activate the parking brake B after detecting that the traveling speed becomes almost zero.

Further, in the tracked vehicle A, each part such as the engine E, the hydraulic traveling transmission H and the working part 2 can be controlled by remote operation from a remote controller separated from the vehicle body. In this case, since the driver is not on board, the effect of preventing a sudden stop and the effect of improving safety by maintaining the stopped state are conspicuous.

The present invention is not limited to the remote-controlled tracked vehicle A equipped with the hydraulic traveling transmission H, and if the vehicle is a self-propelled vehicle, a general self-propelled vehicle operated by a driver, or
The present invention can be implemented even in a wheel-type self-propelled vehicle or a self-propelled vehicle equipped with a gear-type or automatic speed change type traveling transmission, in short, after the traveling transmission becomes neutral. The parking brake may be automatically activated after waiting for the traveling speed to decrease.

When the finger is removed from the joystick j due to an erroneous operation or the like, the joystick j returns to the neutral position and tries to operate the parking brake B. However, as described above, the traveling speed of the tracked vehicle A is increased. However, it waits for the parking brake B to be actuated until the speed of the parking brake B is lowered to a level that does not cause any trouble, and the energization of the parking brake release solenoid s is cut off. Therefore, the joystick j is normally operated within this waiting time. If so, sudden braking can be prevented.

FIG. 4 shows that the operation of the armrest 40 which is mounted on the driving section 4 in an undulating manner is linked to the parking brake B, and when the armrest 40 is raised for the driver to get on and off, the parking brake B is activated. 2 shows a parking brake system S of another embodiment in which the tracked vehicle A is kept in a stopped state. The parking brake system S includes an armrest position confirmation switch 41 for interrupting conduction when the armrest 40 is raised. ,Power supply
When the armrest position confirmation switch 41 is cut off by connecting to a contact relay 44 in the circuit 43 between the 42 and the joystick controller CJ, the operation of the joystick controller CJ is disabled and the controller A signal is output to C to activate the parking brake B. In the figure, 45 and 46 are forward and reverse switches of the joystick controller CJ, respectively.
When the continuity is cut off, the brake is activated.

[0024]

According to the present invention, the following effects can be obtained.

That is, the vehicle is equipped with a traveling transmission and a parking brake, and after the time required for the parking brake to be lowered to a speed at which the parking brake is not hindered from the time when the traveling transmission is set to neutral, the automatic transmission is automatically operated. Since the parking brake does not operate unless the traveling speed of the vehicle becomes low by activating the parking brake, it is possible to prevent sudden stop and damage to the parking brake.

Further, when the vehicle is stopped with the traveling transmission set in the neutral position, the parking brake is automatically actuated to reliably maintain the stopped state, so that the safety can be improved.

Further, when the traveling transmission is set to neutral such as on a sloping ground, the parking brake of the present invention controls the operation start timing of the parking brake by time even if the vehicle does not stop forever, so that the parking brake is constant. Since the parking brake is automatically actuated after a lapse of time, the stopped state can be maintained and the safety can be ensured even on a slope.

In particular, when the parking brake of the present invention is applied to a remote control type self-propelled vehicle, when the traveling transmission is neutrally operated, the parking brake automatically operates, which facilitates remote operation. It is possible to prevent sudden braking and damage to the parking brake while maintaining safety and ease of operation.

[Brief description of drawings]

FIG. 1 is a side view of a tracked vehicle including a parking brake for a self-propelled vehicle according to the present invention.

FIG. 2 is an explanatory diagram showing a configuration of a hydraulic traveling transmission device.

FIG. 3 is an explanatory diagram showing a configuration of a parking brake system.

FIG. 4 is an explanatory diagram showing a configuration of a parking brake system of another embodiment.

[Explanation of symbols]

 B Parking brake C Controller

Claims (1)

[Claims] 1. A vehicle equipped with a traveling transmission and a parking brake, wherein the automatic transmission is carried out after a time required for reducing the traveling brake to a speed at which the parking brake is not hindered from the time when the traveling transmission is set to neutral. A parking brake for a self-propelled vehicle, which is characterized by activating the parking brake.