JPH02220951A - Parking brake device for vehicle - Google Patents

Abstract

PURPOSE:To realize the feeling of moderation at the time of braking and prevent the occurrence of a striking sound at the time of release by retaining in a stop- engaging condition by means of a retaining member the stop-engaging member of an arm member linking with a brake pedal, or an operating member conducting energization in a release direction. CONSTITUTION:At the time of a braking operation, a brake pedal 26 is stepped on, and braking is secured by means of an arm member 20 linking with the brake pedal 26. A stop-engaging member 27 is turned in a stop-engaging direction by means of an operating rod 28, and as soon as the stop-engaging member 27 is stop-engaged at the arm member 20, the stop-engaging member 27 or the operating rod 28 is retained at a stop-engaging position by means of a retaining member 30. Accordingly, as much moderation feeling as is enough for this retaining force, is obtained. The pedal 26 is stepped on hard at the time of release, and the stop-engaging of the stop-engaging member 27 and the arm member 20 comes into a condition in which it is released, but a complete release is realized by an operator operating the operating rod 28, as the stop-engaging member 27 is placed in a stop-engaging condition by means of the retaining member 30. Accordingly, a striking sound caused by the abrupt movement of the stop-engaging member 27 does not occur.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a parking brake device for a vehicle that operates the parking brake by depressing and holding the brake pedal, and particularly relates to a parking brake device for a vehicle that operates the parking brake by depressing and holding the brake pedal. (If the brake is configured to be released by pressing the brake pedal, this prevents abnormal noises such as the tapping sound between various parts that occur when the brake is released, and also ensures a sense of moderation when applying the parking brake.) This invention relates to a parking brake device.

[Conventional technology]

For example, a parking brake device in a vehicle such as a riding lawn mower is configured to maintain the rear wheel brake in an activated state by keeping the brake pedal depressed, and this is also used as the parking brake. There is.

Conventionally, as such a parking brake device, for example, an arm member that rotates together with the brake pedal is fixed, and a locking member that can lock with the arm member is rotatably provided, so that the arm member is at the pedal depression position. By locking the locking member to this when the
Some brake pedals are configured to maintain the depressed state of the brake pedal. Here, the operating member that rotates the locking member to the locking position or the release position is normally biased in the parking brake release direction. Further, in such a parking brake device, when the brake pedal is further depressed, the arm member and the locking member are disengaged, and the locking member is rotated in the release direction by the biasing force of the operating member. It is configured as follows.

[Problem that the invention seeks to solve]

In the parking brake device described above, when applying the parking brake, the brake pedal is depressed and the above-mentioned operating member is operated to engage the locking member with the arm member, thereby maintaining the depressed state of the brake pedal. However, in this case, there is a problem in that the driver cannot clearly recognize the locked state between the arm member and the locking member, that is, there is no sense of moderation.

In addition, when releasing the parking brake, the brake pedal is strongly depressed, but in this case, the operating member and the locking member move or rotate vigorously in the releasing direction due to the biasing force of the operating member. As a result, there is a problem in that abnormal noises such as tapping sounds between the respective members and the stopper member are generated.

The present invention has been made in order to solve the above-mentioned conventional problems, and provides a sense of moderation when applying the parking brake, as well as preventing the generation of abnormal noise when the parking brake is released. The purpose of the present invention is to provide a parking brake device for a vehicle that is equipped with a parking brake.

[Means for solving problems]

The present invention provides a parking brake device for a vehicle in which a brake pedal is held in a depressed state, including an arm member that rotates in conjunction with the brake pedal,
A locking member that locks and holds the arm member in a parked state is rotatably provided, and an operating member that rotates the locking member in the locking direction or the release direction is biased in the release direction to lock the arm member. The present invention is characterized in that a holding member is provided which is connected to the member and holds the locking member or the operating member in the locked state.

[Effect]

According to the parking brake device according to the present invention, when applying the parking brake, the brake pedal is first depressed and the locking member is rotated in the locking direction using the operating member. Then, along with this rotation, the locking member locks with the arm member, and the locking member or the operating member is held in the locking position by the holding member, and the sense of moderation is increased by this holding force. can get.

On the other hand, when releasing the brake pedal, first step on the brake pedal strongly, then the locking member and the arm member can become unlatched, but in this case, the locking member or the operating member is held by the holding member. Since it is held in a locked state, when the driver operates the operating member,
For the first time, the above-mentioned locked state is completely released.

Therefore, unlike the conventional structure, the locking member and the operating member do not move forcefully in the release direction as soon as the brake pedal is strongly depressed, causing a hitting sound with the stopper, etc., and as a result, there is no abnormality. Can prevent sound generation.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 to 5 are diagrams for explaining a parking brake device for a riding lawn mower according to an embodiment of the present invention.

In the figure, reference numeral 1 denotes a riding-type lawn mower in which the device of this embodiment is adopted, and the body frame 2 of all the lawn mowers has a pair of left and right side frames 2a connected and fixed by a cross-vibrator (not shown). The floor plate 2 is placed between the two side frames 2a.
This is a structure in which the cast of b is fixed. The body frame 2
A pair of left and right front wheels 3. A rear wheel 4 is disposed, and a so-called vertical engine 5 having a crankshaft 5a vertically disposed is mounted on the front upper surface. The engine 5 is surrounded by a vehicle body cover 5b, a steering handle 6 is disposed near the rear end of the vehicle body cover 5b, and a seat 7 is mounted behind it.

The lower end of the crankshaft 5a projects downward from the vehicle body, and a cutter drive pulley 12d having a rear wheel drive pulley 12a1 and an electromagnetic clutch 12G is disposed on this protrusion. Further, between the front wheel 3 and the rear wheel 4, a cutter housing 8 containing a cutter 9 is provided with front and rear arms 10a.

It is suspended and supported by lQb so that it can move up and down. Pulley tta fixed to the cutter 9 and drive pulley I
A V-belt IIC is wound between the drive pulley llb and the inlet pulley lid fixed to the drive pulley llb, and a belt lie is wound between the boot IJ12d and the input pulley lid fixed to the drive pulley llb.

The rear wheels 4 are driven by a transmission 13 that is suspended and supported by the vehicle body frame 2, and a brake disc plate 14 is rotatably disposed above the transmission 13. A pair of disc bands 15.15 are arranged on the upper part of the disc plate 14 so as to sandwich the edges thereof, and a pressing pin 16 is further provided to press the outer disc pad 15 toward the disc plate 14. is installed. A drive arm 17 is rotatably supported by a support pin 18 on the outside of the press pin 16. When the drive arm 17 is rotated, a cam 17a formed on the drive arm 17 moves the press pin 16. Press inward,
As a result, the disc plate 14 is held between the pair of disc pads 15, and the brake is activated.

A rear end portion of a transmission rod 19 for transmitting the depression operation of the brake pedal is connected to the drive arm 17. The front end of the transmission loft 19 is inserted into a connecting case 21 fixed to the arm member 20, and there is a gap between the locking plate 22a attached to the tip of the connecting loft 19 and the connecting case 21. A biasing spring 22 is inserted.

This biasing spring 22 serves to more reliably operate the brake by absorbing the difference in rotation angle between the drive arm 17 and a brake pedal 26, which will be described later.

A locking pin 23 that protrudes inward in the vehicle width direction is fixed to the upper end of the arm member 20, and a rotation shaft 24 is fixed to the lower end. This rotation shaft 24 extends outward and is rotatably supported by a support vibe 25 via a bush 25a. Note that 34 is a biasing spring that biases the arm member 20 in the brake release direction.

A boss portion 26a of a brake pedal 26 is fitted onto the outer end of the rotation shaft 24 and fixed thereto with bolts.

The brake pedal 26 is composed of two substantially V-shaped rod-like members, the upper part of which projects upward from the floorboard 2b of the vehicle, and a rubber member 26b is fixed to this projecting part.

Further, on the floor plate 2b of the vehicle body frame 20, a locking member 27 is swingably supported by a bracket 27d. A locking portion 27a is formed at the rear end of this locking member 27, and this locking portion 27a is connected to the arm member 20.
It can be locked to the locking bin 23 of. In addition, 27b
is a guide pin that slides on the locking pin 23. Further, a lower end 28a of an operating rod 28 is connected to the tip of the locking member 27, and this operating rod 28 is urged downward in the drawing by an urging spring 29, and its upper end is attached to the steering handle 6. It extends to the lower side, and an operating knob 28b is fixed thereto. As a result, the operating rod 28 urges the locking member 27 clockwise in FIG. 1, that is, in the direction in which the locking with the arm member 20 is released.

Further, a holding member 30 is fixed to the floor plate 2b at a position in front of the locking member 27 with a bolt 33. This holding member 30 has a structure in which a reinforcing plate 32 is brought into contact with the back side of a spring retainer 31 in which retaining parts 31a and 31b are present, and when the above-mentioned operation iron 28 is operated up and down, the locking member 27 is The tip portion 27C is held in place by the locking recesses 31a and 31b with a certain biasing force.

Next, the effects of this embodiment will be explained.

In this embodiment, to apply the parking brake, the brake pedal 26 is depressed, and the arm member 23 rotates clockwise in FIG. 1 together with the brake pedal 26 against the biasing force of the biasing spring 34. Along with this, the transmission loft 19 moves forward while contracting the biasing spring 22, the drive arm 17 rotates counterclockwise around the support shaft 18, and the cam 17a moves the pressing bottle 16 as shown in FIG. Pushing it upward causes the disc pad 15 to clamp the disc plate 14, and the rear wheel brake is activated. In this state, the operating rod 28 is pulled upward against the urging force of the urging spring 29 and the urging force of the spring plate 3I. Then, the tip end 27c of the locking member 27 moves from the locking recess 31b to the locking recess 31a of the spring plate 31 and is locked there, and the locking portion 27a of the locking member 27 is moved to the locking recess 31a of the spring plate 31.
(See the two-dot chain line in FIG. 1).

At this time, when the brake pedal 26 is released, the arm member 20 is urged to rotate counterclockwise by the biasing spring 34, so that the locking pin 23 of the arm member 20 and the locking member 27 are engaged. The locked state with the stop portion 27a is maintained, and the parking state is maintained.

To release the parking state, the brake pedal 26 is further depressed, and the locking member 27
A slight gap is created between the locking portion 27a and the locking pin 23, and in this state, when the operating rod 28 is pushed down against the biasing force of the spring plate 31, the locking member 27 moves to the position shown in FIG. The locking portion 27a and the locking pin 23 rotate clockwise in the release direction.
When the lock is released and the parking state is released, the tip of the locking member 27: 4 part 27C is connected to the lower locking recess 31.
b.

In this way, in this embodiment, the tip end 27c of the locking member 27
are locked in the locking recesses 31a and 31b of the spring plate 31, so when applying the parking brake, the operating rod 28 is pulled up against the spring force of the spring plate 31 and its tip 27C is Since it is moved from the locking recess 31b to 31a, a sense of moderation corresponding to the above-mentioned spring force is obtained, and the parking brake can be operated more reliably.

Furthermore, when releasing the parking brake, even if the brake pedal 2G is strongly depressed, the operating rod 28 will not suddenly move in the releasing direction (it will not move in the above-mentioned depressed state).
Since the brake state is released only by pushing down the operating rod 28 against the biasing force of the spring plate 31, the locking member 27. Abrupt movement of the operating rod 28 etc. will not cause any abnormal noise such as hitting with the stopper member, and when the parking brake is released, the locking member 27 has its tip 27c on the lower side. Since it is locked and held in the locking recess 31b, the operating rod 28 and the like will not rattle.

In the above embodiment, the operating rod 28 is urged downward by the urging spring 29, but this may be configured so that the operating rod 28 is urged downward only by the rod's own weight.

Further, in the above embodiment, the locking member 27 is connected to the locking spring plate 31.
However, there are various modifications to this holding method. For example, the operating rod itself may be held in a predetermined locked state or released state.

Furthermore, in the above embodiment, a riding lawn mower was used as an example, but the scope of application of the present invention is of course not limited to such a machine. Therefore, it can be applied to the parking brake device of any vehicle as long as it also functions as a parking brake.

〔Effect of the invention〕

As described above, according to the parking brake device for a vehicle according to the present invention, since the locking member or the operating member is held in the locked state by the holding member, a sense of moderation can be achieved when applying the parking brake. In addition, when the parking brake is released, there is no hitting sound caused by sudden movement of the operating member, etc., and it is possible to prevent the occurrence of abnormal noise.

[Brief explanation of the drawing]

1 to 5 are diagrams for explaining a parking brake device for a riding lawn mower according to an embodiment of the present invention, in which FIG. 1 is a side view thereof, FIG. 2 is a plan view thereof, Figure 3 is a sectional view taken along the line ■-■ in Figure 1, and Figure 4 is a cross-sectional view taken along the line ■-■ in Figure 1.
FIG. 5, a sectional view taken along line IV, is a schematic configuration diagram of the riding lawn mower of this embodiment. In the figure, 1 is a lawn mower m (vehicle), 20 is an arm member, 26 is a brake pedal, 27 is a locking member, 28 is an operating rod (operating member), and 30 is a holding member. Patent Applicant Yamaha Motor Co., Ltd. Agent Patent Attorney Tsutomu Shimoichi 3rd 4th

Claims (1)

[Claims] (1) In a parking brake device for a vehicle in which the parking brake is operated by holding the brake pedal in a depressed state, an arm member that rotates in conjunction with the brake pedal is provided, and the arm member is set in the parking state. A locking member to be locked is rotatably provided, and an operating member for rotating the locking member in the locking direction or the release direction is urged in the release direction to connect to the locking member, and the locking member is connected to the locking member. A parking brake device for a vehicle, comprising a holding member that holds the locking member or the operating member in the locked state.