JPH0667236U - Brake fluid pressure retention device - Google Patents

Abstract

(57) [Abstract] [Purpose] It can be easily retrofitted to the vehicle currently in use, and by keeping the pedal pedal depressed as it is, it can be used as a footrest while retaining brake fluid pressure. Moreover, we propose an extremely safe brake fluid pressure retaining device. [Structure] A brake pedal 1, a rack member 23 that moves upward as the brake pedal is depressed, and a rack member 23 that moves downward as the brake pedal is released, and rotates while meshing with a rack 25 of the rack member 23. A pinion 8 and a pinion shaft 7 supporting the pinion,
It is composed of an electromagnetic clutch that restricts the pinion shaft to rotate only in one direction via a one-way clutch bearing 6a, and an electronic control device that controls energization of the electromagnetic clutch.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 INDUSTRIAL APPLICABILITY The present invention is a new brake fluid pressure holding device that can be easily installed in a conventional brake fluid device without changing the brake fluid pressure piping and can perform the same function as a conventional brake fluid pressure holding device. It relates to the device.

[0002]

[Prior art]

 As is well known, when a vehicle temporarily stops at an intersection, etc., the brake fluid pressure retaining device of the vehicle retains the brake fluid pressure at that time, and the occupant does not operate the parking brake or continue to depress the brake pedal. It is a device that automatically keeps the vehicle in a stopped state and then automatically releases the brake by detecting the state when the vehicle is started, such as by depressing the accelerator. As this device is extremely effective for preventing the creep phenomenon in a vehicle with an automatic transmission, it has recently been increasingly adopted in vehicles with an automatic transmission.

This brake fluid pressure holding device is generally provided with an electromagnetic valve in the brake pipe, and by controlling this electromagnetic valve by an electronic control unit, the brake fluid pressure can be held. There is. In such a brake fluid pressure retention device, it is necessary to install a solenoid valve in the brake piping, so if this device is to be installed, the brake piping must be changed, which complicates the work and costs it. It takes. Further, when such a brake fluid pressure retaining device is mounted on a vehicle which is already in use, it is difficult to simply mount it. In addition, since it is a mechanism that holds the brake fluid pressure with a solenoid valve, if you release your foot from the brake pedal while the brake fluid pressure is being held, the brake pedal is not fixed to the depressed position but can be used as a footrest. There were problems such as not being able to do it. For this reason, there has been proposed a brake fluid pressure retaining device capable of retaining the brake fluid pressure by maintaining the depressed state of the brake pedal (see Japanese Utility Model Publication No. 3-27009).

This brake fluid pressure retaining device will be briefly described with reference to FIG. 5. This device includes a brake pedal 51 pivotally supported by a shaft 51a on a dash board and an axle provided on a retaining bracket 58. A rack member 53 pivotally supported by 52, a connecting member 54 for connecting the brake pedal 51 and the rack member 53, and a pinion 55 that meshes with a rack 56 of the rack member 53. A shaft 57 for supporting the pinion 55, a one-way clutch for rotatably supporting the shaft 57 in only one direction, a holding bracket 58 for supporting the one-way clutch via a bearing, and the holding bracket 58. And an electromagnetic clutch (not shown) attached to the shaft 57 to regulate the rotation of the shaft 57.

In this brake fluid pressure retaining device, when the brake pedal 51 is stepped on, the rack member 53 also swings about the shaft 52 via the connecting member 54, and the movement of the rack 55 causes the pinion 56 and the shaft 57 to move. Rotate. When the vehicle speed falls below the set speed, a signal from the electronic control unit activates an electromagnetic clutch (not shown) and the one-way clutch function causes the shaft 57 and the pinion 56 to rotate only in the clockwise direction in the figure, but to rotate in the counterclockwise direction. Rolling is prohibited. As a result, the movement of the brake pedal 51 in the returning direction is prohibited, the brake pedal 51 is fixed at the depressed position, and the braking force is retained. To release the brake holding state, when the accelerator pedal (not shown) is stepped on, the electromagnetic clutch is released by the signal from the electronic control unit and the pinion 56 can rotate counterclockwise, and the brake pedal 51 presses the urging force of the brake spring. To return to the return position.

[0006]

[Problems to be solved by the device]

 However, in the above device, the brake pedal and the rack member are connected by the connecting member 54, and it is required that the brake pedal and the rack member move at an extremely high speed even during sudden braking. Therefore, the assembly with high accuracy is required. Further, since the rack operating force with respect to the pinion is larger than the operating force of the booster (reaction force of the rod), this mechanism requires an electromagnetic clutch with a large holding force, resulting in an increase in size of the device. Furthermore, when releasing from the brake holding state, it is necessary to step on the accelerator, so if the wheel locks on a low μ road, the brake pedal will be held in that state, which is extremely dangerous. Therefore, the present invention can be easily retrofitted to a vehicle currently in use, and by keeping the pedal pedal depressed as it is, it can be used as a footrest while retaining brake fluid pressure and is extremely safe. We propose a new brake fluid pressure retaining device to solve the above problems.

[0007]

[Means for Solving the Problems]

 Therefore, in the present invention, the brake pedal, the rack member that moves upward as the brake pedal is depressed, and the rack member that moves downward as the brake pedal is released are rotated while meshing with the rack of the rack member. A pinion, a pinion shaft that supports the pinion, an electromagnetic clutch that restricts the pinion shaft to rotate in only one direction via a one-way clutch bearing, and an electronic control device that controls energization of the electromagnetic clutch. And is used as a means for solving problems.

[0008]

[Action]

 When the brake pedal 1 is depressed, with the movement of the brake pedal 1 at this time, the rack member 23 is set with the roller 26 pivotally supported by the rack member 23 in contact with the upper surface of the lever of the brake pedal. It is pulled upward by the urging force of the spring 24. At this time, the rack member 23 is also in contact with the roller 21, and is pulled up while rotating the pinion 8 clockwise. A pedal force switch 1b provided on the brake pedal detects the pedal force, a wheel speed sensor (not shown) detects that the wheel speed is below a predetermined value, an accelerator switch detects an accelerator open state, and The state where the brake switch 4 is stepping on the brake is detected, and when all of these conditions are satisfied, electricity flows through the electromagnetic coil 14, and the stator 10 attracts the clutch plunger 9. As a result, the function of the one-way clutch bearing 6a inhibits the counterclockwise rotation of the pinion described above, and the stepped position of the brake pedal is maintained.

When the brake fluid pressure is released, when the brake pedal is opened (or even when one of the above conditions is not satisfied), the energization of the electromagnetic coil is stopped, and the stator 10 of the clutch plunger 9 is stopped by the stator 10. The suction is stopped and the pinion can rotate freely. As a result, the roller 26 is pushed by the restoring force of the brake pedal itself, and the rack member moves to the initial position by pulling the set spring 24 and rotating the pinion by the component force at this time. In this way, the brake pedal returns to its return state.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of a brake fluid pressure retaining device according to the embodiment of the present invention, FIG. 2 is a sectional view taken along line AA in FIG. It is a principal part enlarged view in FIG. In the figure, a brake pedal 1 is axially supported by a shaft 1a on a pedal bracket 2, and when the brake pedal 1 is stepped on, a push rod 1c pushes a piston of a master cylinder (not shown) through a booster to generate a braking force. You can let them do it. Further, the brake pedal is provided with a pedal force switch 1b for detecting a signal necessary for controlling the brake pedal which will be described later. Further, a brake switch 4 and a pedal stopper unit 3 having a configuration described later are fixed to the pedal bracket 2.

The pedal stopper unit 3 has a housing case 5, and the housing case 5 holds a one-way bearing 6 a via a bearing 6 as shown in FIG. A pinion shaft 7 is axially supported by the one-way bearing 6a, and a pinion 8 that meshes with a rack described later is provided on the pinion shaft 7. The one-way bearing 6a has a function of allowing the pinion shaft 7 to rotate only clockwise in the drawing. A clutch plunger 9 is non-rotatably and axially slidably supported on the pinion shaft 7. It is needless to say that the one-way clutch bearing 6a may be provided between the clutch plunger 9 and the pinion shaft 7 and may be provided anywhere as long as it has a similar function.

A stator 10 is provided so as to face the clutch plunger 9, and the clutch plunger 9, the stator 10 and an electromagnetic coil 14 described later form an electromagnetic clutch. As shown in FIG. 3, a spring 11 for urging the clutch plunger 9 to the left in the drawing is arranged between the clutch plunger 9 and the stator 10, and the spring seat 12 of the spring 11 has a protrusion 13. Therefore, the frictional force with the stator 10 is prevented from increasing during rotation. When the electromagnetic coil 14 is energized, the stator 10 generates an electromagnetic force, attracts the clutch plunger 9, and prohibits the above-described rotation of the pinion in the counterclockwise direction in the figure, thereby depressing the brake pedal. Has a function to hold the brake and prohibit the return operation of the brake pedal.

As shown in FIG. 2, the stator 10 is fixed to a yoke plate 15a by bolts 16, and the electromagnetic coil 14 is sandwiched between the yoke plate 15a and the other yoke plate 15b, and is fixed by the yoke bolts 17 as described above. It is fixed to the housing case 5. In the figure, 18 and 19 are spacers. The housing case 5 is formed with an elongated hole 20 (see FIG. 1) formed in the horizontal direction, and the shaft of the roller 21 is slidably held in the elongated hole. This shaft is pulled leftward in the figure by an overload spring 22. The rack member 23 is supported by the housing while being brought into contact with the roller 21 and being pulled upward in the drawing by the set spring 24. The pinion 8 is engaged with the rack 25 of the rack member 23.

Further, a roller 26 is rotatably provided on the rack member 23, and the roller 26 is arranged so as to come into contact with the upper surface of the lever of the brake pedal. In other words, the rack member 23 is in contact with the roller 21 urged by the overload spring 22 and is in contact with the upper surface of the brake pedal lever via the roller 26 while meshing with the pinion 8. Has become. Therefore, the rack member 23 is always supported by the biasing force of the set spring 24 while being engaged with the pinion 8 and with the roller 26 in contact with the upper surface of the lever of the brake pedal. Therefore, when the brake pedal is stepped on, the rack member 23 moves upward in the figure by the biasing force of the set spring 24 while rotating the pinion 8 clockwise.

When the electromagnetic coil 14 is energized, the stator 10 attracts the clutch plunger 9, and the function of the one-way clutch bearing 6a prohibits the counterclockwise rotation of the pinion described above. The dull's depressed position will be maintained and the brake pedal's return operation will be prohibited. Even when the clutch plunger 9 is attracted by the stator 10, the brake pedal can be further depressed due to the function of the one-way clutch bearing 6a, which can increase the brake fluid pressure. Further, in the state where the brake fluid pressure is held, if the holding fluid pressure becomes higher than necessary, the roller 21 pulls the spline 22 against the urging force of the overload spring 22 and moves to the right in the figure. This moves the brake pedal slightly to the right in the figure, reducing the brake fluid pressure.

Next, a control block diagram of this embodiment will be described with reference to FIG. As shown in the figure, in the present invention, the pedal force switch 1b provided on the brake pedal detects the pedal force, a wheel speed sensor (not shown) detects that the wheel speed is below a predetermined value, and the accelerator switch releases the accelerator pedal. It is detected that the brake switch 4 is stepping on the brake, and when all of these conditions are satisfied, the electromagnetic coil 14 is energized by the AND circuit. Therefore, when the above condition is satisfied and electricity flows through the electromagnetic coil, the stator 10 attracts the clutch plunger 9 and prohibits the pinion from rotating counterclockwise. As a result, the depressed position of the brake pedal is maintained and the brake fluid pressure is maintained. Further, when any one of the above conditions is not satisfied, or when the brake is released, the electromagnetic coil is de-energized, the suction of the clutch plunger 9 by the stator 10 is stopped, and the pinion can freely rotate. .

Next, the operation of the above embodiment will be described. When the brake pedal 1 is depressed, the push rod 1c pushes the piston of the master cylinder (not shown) through the booster to generate the braking force. With the movement of the brake pedal 1, the rack member 23 contacts the roller 21 and meshes with the pinion 8 while rotating the pinion 8 clockwise, and the roller 26 pivotally supported by the rack member 23. Is in contact with the upper surface of the lever of the brake pedal, and is pulled upward by the urging force of the set spring 24. When all the above-mentioned conditions are satisfied, the electromagnetic coil 14 is energized, the stator 10 attracts the clutch plunger 9, and the function of the one-way clutch bearing 6a prohibits the counterclockwise rotation of the pinion. , This holds the brake pedal in the depressed position.

Even in this state, the brake pedal can be further depressed by the function of the one-way clutch bearing 6a, which can increase the brake fluid pressure. In addition, when the holding hydraulic pressure becomes higher than necessary in the brake hydraulic pressure holding state, the roller 21 pulls the spline 22 against the urging force of the overload spring 22 and moves to the right in the figure. As a result, the brake pedal moves slightly to the right in the figure, reducing the brake fluid pressure. In this way, it is possible to prevent an excessively high hydraulic pressure from being maintained.

When releasing the holding of the brake fluid pressure, if the brake pedal is opened (or even if one of the conditions of the circuit is not satisfied), the energization of the electromagnetic coil is stopped, and the clutch plunger by the stator 10 is stopped. The suction of 9 is stopped and the pinion can rotate freely. As a result, the roller 26 is pushed by the restoring force of the brake pedal itself, and the rack member moves to the initial position by rotating the pinion while pulling the set spring 24 by the component force at this time. In this way, the brake pedal will return to the return state.

[0020]

[Effect of device]

 As described in detail above, according to the present invention, since the rack member is not fixed to the brake pedal, it is not necessary for the rack member to follow the rapid movement of the brake pedal even during sudden braking. , It does not become an operation resistance. Also, since the component force due to the angle of the contact surface between the guide surface of the rack of the rack member and the roller contacting the pedal is the transfer force of the rack member and the operating force of the pinion, the holding force of the electromagnetic clutch is It can be small, and the entire device can be downsized. Furthermore, since the brake pedal can be held when the foot is on the brake pedal with the pedal force switch, even if the wheels are locked on a low μ road, the brake holding is released by releasing the foot from the brake pedal, It has excellent effects such as high safety.

[Brief description of drawings]

FIG. 1 is a side view of a brake fluid pressure retaining device according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is an enlarged view of a main part in FIG.

FIG. 4 is a control block diagram of a brake fluid pressure retaining device according to an embodiment of the present invention.

FIG. 5 is a side view of a conventional brake fluid pressure retaining device.

[Explanation of symbols]

 1 Brake Pedal 3 Pedal Stopper Unit 4 Brake Switch 5 Housing Case 6a One-way Clutch Bearing 7 Pinion Shaft 8 Pinion 9 Clutch Plunger 10 Stator 14 Electromagnetic Coil 21, 26 Roller 22 Overload Spring 23 Rack Member 24 Set Spring

Claims (3)

[Scope of utility model registration request] 1. A brake pedal 1 and a rack member 23 that moves upward as the brake pedal is depressed and moves downward as the brake pedal is released.
A pinion 8 that rotates while meshing with the rack 25 of the rack member, and a pinion shaft 7 that supports the pinion.
And an electromagnetic clutch that restricts the pinion shaft to rotate only in one direction via the one-way clutch bearing 6a, and an electronic control device that controls energization of the electromagnetic clutch. Brake fluid pressure retention device. 2. The one-way clutch bearing 6a is rotatably held in the housing 5 via the bearing 6, and relative rotation between the one-way clutch bearing 6a and the housing 5 is prohibited if necessary. The brake fluid pressure retaining device according to claim 1, wherein the brake fluid pressure retaining device is a brake fluid pressure retaining device. 3. The electromagnetic clutches 9 and 10 prevent the relative rotation between the one-way clutch bearing 6a and the housing 5.
The brake fluid pressure retaining device according to claim 1, wherein the brake fluid pressure retaining device is configured to be performed by the brake fluid pressure retaining device.