JPH0146339B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a braking force retention device for a vehicle.

For example, in a torque converter vehicle, if the vehicle does not brake with the foot brake when stopped, such as when waiting at a traffic light, or set the torque converter range to neutral or park, the vehicle will move forward at low speed due to the creep phenomenon.

Conventionally, a type of brake fluid sealing system has been proposed as a countermeasure for the above-mentioned problem, but with this method, once the brake pedal is depressed, the position of the master cylinder where the fluid pressure increases moves, causing a cup to enter the hole leading to the reservoir. It will pass in an inflated state. Therefore, there was a drawback that the swollen cup could get scratched.

In addition, when the brake is applied to a stop and the brake continues for about 2 seconds, an electromagnet is excited and attracts a suction plate, thereby preventing the brake pedal from being depressed again.
This is proposed in Publication No. 7100, etc. With this device, if the braking force is insufficient after the first depression, even if you try to apply the brakes again, the brake pedal is fixed and cannot be depressed again, so you de-energize the electromagnet by depressing the accelerator pedal. The brakes cannot be applied again unless the switch is actuated or another signal is applied.
Of course, if the brake is applied again while the electromagnet is still energized, the adsorption plate attached to the electromagnet will slip, but if this situation is repeated, the adsorption plate will wear out severely, which is not desirable.

Previously, a brake pedal device was proposed in Utility Model Application No. 122085/1985, and a technology was disclosed that enabled the brake pedal to be further depressed without deactivating the brake device. In this device, even if the brake device is moved from the operating position to the non-operating position, the brake pads are kept in contact with the brake device and slide on the suction surface of the brake device, which worsens the return of the brake pedal and causes brake failure. As drag occurs,
As the brake pads slide, wear on the brake pads increases, the clearance between the brake pads and the brake device increases, and the suction force of the brake device that is applied to the brake pads decreases, keeping the brake pedal in the desired position. There were drawbacks such as the inability to do so.

The present invention solves the above-mentioned conventional drawbacks by providing a one-way clutch that constantly rotates the shaft that is linked to the depression of the brake pedal but does not allow it to rotate in the opposite direction.The present invention also provides a spacer that controls the axial movement gap of the clutch plate. This allows for easy accuracy control and re-depression of the brake pedal, and also maintains a constant clearance between the clutch plate and the friction plate, ensuring that a constant pedal holding force is always obtained and the brake pedal is pressed to the desired position. It is an object of the present invention to provide a braking force holding device for a vehicle that can be held in position.

That is, a shaft that is rotationally driven in conjunction with depression of the brake pedal, a one-way clutch that allows the shaft to freely rotate independently in the direction of depression of the brake pedal, but rotates together with the casing in the opposite direction, and a cylindrical clutch. an electromagnet which is fixed to the vehicle body so that the casing of the one-way clutch is rotatably fitted on its inner peripheral surface, and has a friction plate at one end thereof protruding from one end surface of the casing; A pin fixed to one end surface of the casing parallel to the shaft, a through hole through which the pin is inserted, and one end surface facing the friction plate, movable in the axial direction of the shaft, and integral with the casing. a clutch plate that is rotatably mounted on the shaft via the pin and is attracted when the electromagnet is energized and has its one end surface pressed against the friction plate; and a distance from the one end surface of the casing to the friction plate. has an axial length greater than the distance obtained by adding the thickness of the clutch plate to a spacer that can come into contact with the other end surface of the clutch plate, and a washer that is arranged on the outer peripheral surface of the end of the shaft so as to come into contact with one end of the spacer, the casing or the spacer, and the clutch plate. a spring which is stretched between one side and biases the clutch plate toward the washer and keeps the clearance between the clutch plate and the friction plate of the electromagnet constant when the electromagnet is demagnetized; By providing a control mechanism that issues a signal to energize the electromagnet when the value falls below a set value, and issues a signal to de-energize the electromagnet when a separately provided switch is activated,
Keep the brake depressed when the vehicle is stopped,
It is also an object of the present invention to provide a braking force retention device for a vehicle, which allows the brake pedal to be depressed without releasing the fixation of the clutch plate even when re-braking, and which facilitates accurate control of the appropriate clearance for movement of the clutch plate. be.

The present invention is configured as described above, so there is no risk of damaging the cup of the master cylinder, there is no need for an intermediate hub as in the conventional case, the structure is simple, the number of parts can be reduced, and the gap in the axial direction can be reduced. By pushing the washer with a spring, it is moved to one side,
Improved dimensional accuracy, precision control of the gap in the electromagnetic clutch, ease of re-depressing the brake pedal, and the ability to maintain a constant clearance between the clutch plate and friction plate, resulting in a constant pedal holding force. This brings about effects such as being able to reliably hold the brake pedal at a desired position.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a brake pedal, and a pin 3 on a dash board 2 is used as a fulcrum to swing the pedal.
When you step on the button, push rod 4 activates booster 5.
A piston of a master cylinder (not shown) is pushed through the cylinder to generate braking force.

Reference numeral 6 denotes a rack gear that can swing around a bolt 8 on a bracket 7 fixed to the dash board 2. Teeth 9 are provided on the upper edge of the central window, and a pinion gear 10 meshes with the teeth 9. . The pinion gear 10 is fixed to a shaft 12 via a spline 11, and the shaft 12 rotates freely in the direction in which the brake pedal 1 is depressed (clockwise in FIG. 1), but the one-way clutch 13 rotates in the opposite direction.
The one-way clutch 13 is supported by the casing 14 of the one-way clutch 13 so that it cannot rotate independently.

The opposing portion of the bolt 8 of the rack gear 6 is connected to a pedal stay 16 fixed to the brake pedal 1 via a link bar 15. link bar 1
5 is pivotally connected to a rack gear 6 and a pedal stay 16 by a pin 17, and when the brake pedal 1 is depressed, the rack gear 6 is pulled by the link bar 15 using the bolt 8 as a fulcrum and swings in the same direction.

The casing 14 is prevented from moving to the left by a retaining ring 18 fixed to the shaft 12, and a plurality of pins 19 implanted at the right end of the casing 14 are fitted with a collar of a spacer 20 and a spring. 35
and the clutch plate 21 are inserted, and the clutch plate 2
1 is an electromagnet 2 movable in the axial direction as shown in FIG.
2 is attached so that an appropriate gap (0.3 to 0.9 mm) is formed between the washer 23 and the washer 23.

Although the washer 23 is movable in the axial direction on the shaft 12, it is pressed against the right end surface of the spacer 20 by a spring 25 interposed between it and a spring retainer 24 fixed to the shaft 12. The spacer 20 is interposed in the space between the casing 14 and the clutch plate 21, and its left end surface is in contact with a surface of a bearing member 26 that rotatably supports the casing 14.

The electromagnet 22 includes a yoke 27, a coil 28, and a friction plate 29, and a lead wire 30 is connected to the coil 28. The left end of the bearing member 26 is in contact with a mounting plate 31, and the right end is in contact with a yoke 27, and is fixed integrally with the electromagnet 22. The mounting plate 31 is fixed to the bracket 7 with bolts 8 and 33. Also, 34 is a cover, and 35 is a clutch plate 21.
is a spring that separates the clutch plate 21 from the friction plate 29, and has a smaller spring coefficient than the spring 25. When the washer 23 is pressed against the right end surface of the spacer 20 by the spring 25, the spacer 20 is caused by the spring 35 to cause the clutch plate 21 to contact the friction plate 29. The length in the axial direction is such that it can be separated so that no frictional force is applied.

Particular features of the present invention constructed as in the embodiments described above are that, in a vehicle braking force holding device, a shaft 12 is rotatably driven in conjunction with depression of the brake pedal 1; Although it can be freely rotated independently in the stepping direction of step 1,
In the opposite direction, there is a one-way clutch 13 that rotates together with a casing 14, and a cylindrical one-way clutch 13 whose casing 14 is fixed to the vehicle body so that its inner circumferential surface is rotatably fitted, and at one end thereof. an electromagnet 22 having a friction plate 29 protruding from one end surface of the casing 14; a plurality of pins 19 fixed to one end surface of the casing 14 parallel to the shaft 12; and a plurality of pins 19 through which the pins 19 are inserted. The electromagnet is mounted on the shaft via the pin 19 so as to be movable in the axial direction of the shaft and rotatable integrally with the casing 14, and has one end surface facing the friction plate 29. The thickness of the clutch plate 21 is added to the distance from one end surface of the casing 14 to the end surface of the friction plate 29, and the distance from one end surface of the casing 14 to the end surface of the friction plate 29 is the clutch plate 2 has an axial length greater than the distance
1 and penetrates through the inner circumferential surface of the casing 1.
4 and a washer 2 disposed on the outer circumferential surface of the end of the shaft 12 so as to be able to come into contact with the other end surface of the clutch plate 21.
A spacer 20 is interposed between the spacer 20 and fitted to the shaft 12, and a spacer 20 is interposed between one end surface of the clutch plate 21 and the flange of the spacer 20 to attach the clutch plate 21 toward the washer 23. A spring 35 is provided to keep the clearance between the clutch plate 21 and the friction plate 29 of the electromagnet 22 constant at all times when the electromagnet 22 is demagnetized, and when the speed of the vehicle becomes less than a set value, the electromagnet 22 is energized. The point is that when a separately provided switch is operated, the excitation of the electromagnet 22 is canceled.

Next, the effect will be explained. First, when the brake pedal 1 is depressed, the pedal 1 swings to the left about the pin 3 and generates a braking force via the push rod 4 in a master cylinder (not shown). At the same time, the rack gear 6 swings in the same direction via the link bar 15 using the bolt 8 as a fulcrum, and the pinion gear 10 meshing with its teeth 9 rotates clockwise in FIG. 1.

When the pinion gear 10 rotates, the shaft 12 also rotates in the same direction, but the shaft 12 is free to rotate in the same direction independently of the one-way clutch 13. In this case, the shaft 12 cannot independently rotate in the reverse direction, but when the force of pressing the brake pedal 1 is removed, when the brake pedal 1 returns due to the force of the return spring, the shaft 12 rotates through the rack gear 6 and pinion gear 10. One-way clutch 13, casing 1
4, pin 19, spacer 20, clutch plate 21,
It rotates in the opposite direction together with the washer 23, spring 25, and spring retainer 24.

At this time, when the vehicle speed becomes lower than the set speed, a computer (not shown), which is a control mechanism of the present invention, senses this and sends the signal to the coil 28 of the electromagnet 22. As a result, the electromagnet 22 is excited, and the spring 3
5, the clutch plate 21, which was separated by an appropriate gap (0.3 to 0.9 mm), is attracted to the friction plate 29.
In this case, the clutch plate 21 is attracted and fixed to the fixed electromagnet 22 by the spring force of the return spring of the brake pedal 1.
The shaft 12 together with the casing 14 and one-way clutch 13 cannot be rotated in the opposite direction. Therefore, the brake pedal 1 is fixed at the depressed position and the braking force is maintained.

At this time, if the brake pedal 1 is not depressed enough and the vehicle moves forward at low speed, the fixed brake pedal 1 may be depressed again. Since the shaft 12 rotates independently of the one-way clutch 13 by re-depressing the pedal, the brake is applied again independently of the braking force holding device.

Next, in order to release the fixation of the clutch plate 21 and release the holding of the braking force, step on the accelerator pedal (not shown), a switch provided there activates a computer (not shown), and the signal excites the electromagnet 22. When the clutch plate 21 is released, the spring 3
Move with the spring force of 5 until it touches the washer 23,
The fixation with the friction plate 29 is released. Therefore, the shaft 12 rotates in the opposite direction together with the one-way clutch 13, casing 14 and clutch plate 21, and the brake pedal 1 returns to its original position. An appropriate gap (0.3 to 0.9 mm) is secured between the clutch plate 21 and the friction plate 29 in preparation for the next attraction due to the excitation of the electromagnet 22.

[Brief explanation of drawings]

FIG. 1 is a side view of a braking force holding device showing an embodiment of the present invention, FIG. 2 is an enlarged sectional view from A to A in FIG. 1,
FIG. 3 is a sectional view taken along line B-B in FIG. 2. Explanation of the main parts of the diagram, 1...brake pedal,
3...Pin, 4...Push rod, 6...Rack gear, 7...Bracket, 8...Bolt, 9...
...Teeth, 10...Pinion gear, 12...Shaft, 13
...One-way clutch, 14...Casing,
19... Pin, 20... Spacer, 21... Clutch plate, 22... Electromagnet, 23... Washer, 2
5... Spring, 26... Bearing member.

Claims (1)

[Claims] 1. In a braking force retention device for a vehicle, there is a shaft that is rotationally driven in conjunction with the depression of the brake pedal, and the shaft is freely rotated independently in the direction in which the brake pedal is depressed, but rotates together with the casing in the opposite direction. A one-way clutch, the casing of the one-way clutch having a cylindrical shape is fixed to the vehicle body so that the inner circumferential surface thereof is rotatably fitted, and a friction plate is provided at one end thereof protruding from one end surface of the casing. an electromagnet having an electromagnet, a pin fixed to one end surface of the casing parallel to the shaft, a through hole through which the pin is inserted, and one end surface facing the friction plate and movable in the axial direction of the shaft; and a clutch plate which is attached to the shaft through the pin so as to be rotatable together with the casing, and which is attracted when the electromagnet is energized and has its one end surface pressed against the friction plate; It has an axial length greater than the distance to the end surface of the plate plus the thickness of the clutch plate, penetrates through the inner peripheral surface of the clutch plate, and connects the casing and the other end surface of the clutch plate. A spacer is interposed between washers disposed on the outer peripheral surface of the end of the shaft so as to be able to come into contact with each other and is fitted to the shaft, and a spacer is interposed between one end surface of the clutch plate and a collar of the spacer. and a spring that biases the clutch plate toward the washer and keeps the clearance between the clutch plate and the friction plate of the electromagnet constant when the electromagnet is demagnetized, and when the speed of the vehicle becomes less than a set value. A braking force holding device for a vehicle, wherein the electromagnet is excited and the electromagnet is deenergized when a separately provided switch is operated.