JP3329392B2 - Anti-lock brake modulator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-rotation system which rotates an eccentric shaft by a drive shaft, advances and retreats a piston connected to a side peripheral portion of the eccentric shaft to open and close a valve, and communicates and shuts off brake hydraulic pressure. It relates to a lock brake modulator.

[0002]

2. Description of the Related Art Conventionally, for example, in a piston crank device 2 shown in FIG. 3, a first gear 8 provided on a drive shaft 6 of a motor 4 is replaced with a first gear 8 provided on a rotary shaft 11 having an eccentric shaft 10. The piston 1 meshes with the second gear 12 and contacts the rotational force of the motor 4 with the ring body 14 of the eccentric shaft 10.
6. In this case, a stopper 18 is provided to regulate the rotation range of the second gear 12.

[0003]

In the piston crank device 2 configured as described above, as shown in FIG.
When excessive torque acts from the motor 4 or the piston 16, the second gear 12 collides with the stopper 18.
Alternatively, the first and second gears 8 and 12 may be damaged. Therefore, for example, as a countermeasure, a method of installing a damper such as rubber or a spring between the stopper 18 and the second gear 12 is conceivable, but a space is required, and this is a problem from the viewpoint of miniaturization.

The present invention has been made to solve this kind of problem, and is a small and simple anti-lock device capable of preventing transmission of excessive torque between a drive shaft and an eccentric shaft. It is an object to provide a brake modulator.

[0005]

In order to achieve the above object, the present invention provides a motor (4) and a first shaft (6) which is engaged with a drive shaft (6) of the motor (4) . A gear (8) ;
The diameter of the first gear is larger than that of the first gear (8).
A second gear that meshes with the (8) (26), abuts on one surface of the front Stories second gear (26), said second gear (2
The second gear (26) is brought into contact with a friction plate (28) rotating with the rotation of (6) and the other surface of the second gear (26).
One surface of (26) dishes for pressing said friction plate (28)
A spring (30) and a rotating shaft engaged with the friction plate (28)
(11) and eccentrically connected to the rotating shaft (11).
An eccentric shaft (10), and a reed mounted on the eccentric shaft (10).
The ring body (14) and the outer periphery of the ring body (14).
The contact between the piston (24) and the ring body (14)
Provided position region, said ring member and said ring member by abutting (14) (14) a stopper (38, 40) for regulating the excursion range, made, times of the motor (4)
The first gear (8) and the second gear
(26) The friction plate (28) and the rotating shaft (11)
Transmitted, then the eccentric shaft (10) and the phosphorus
The stopper body (14) is integrally displaced, so that the stopper
(38, 40) corresponding to the deviation range
To move the piston (24) back and forth,
4) Open / close valve (36) to control brake hydraulic pressure
Gyosu and said Rukoto.

[0006]

The rotational driving force of the driving shaft (6) of the motor (4) is
A second gear having a larger diameter through the first gear (8)
(26) is amplified and transmitted to the disc spring (3).
0) the second gear (26) is pressed by friction
After being transmitted to the eccentric shaft (10) via the plate (28) and the rotating shaft (11) engaged with the plate (28) , the eccentric shaft (10)
The piston (24) abuts against the outer peripheral portion of the mounted ring body (14) by advancing and retracting the opening and closing of the valve (36). At this time, when an excessive torque is generated in the drive shaft (6) or the eccentric shaft (10) , a slip occurs between the friction plate (28) and the second gear (26) , thereby absorbing the excessive torque. Is done. In particular, the ring body (14)
Et provided deflection region being an anti-lock braking Tokinio
For limiting the range of deviation of the ring body (14)
Excessive torque is not applied to (38, 40) from the drive shaft (6 ) side.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An antilock brake modulator according to the present invention will be described in detail below with reference to preferred embodiments and the accompanying drawings.

Here, an antilock brake modulator 20 using a gear mechanism for preventing excessive torque transmission will be described with reference to FIGS. The same components as those in FIG. 3 are denoted by the same reference numerals, and detailed description thereof will be omitted.

The modulator 20 basically includes a motor 4, a gear mechanism 22 for preventing excessive torque transmission, an eccentric shaft 10,
It is composed of a piston 24.

As shown in FIG. 2, the excessive torque transmission preventing gear mechanism 22 includes a second gear 26 meshing with the first gear 8 of the drive shaft 6 and a friction plate spline-fitted to the rotating shaft 11. And a disc spring 30 for pressing the side surface of the second gear 26 against the side surface of the friction plate 28. Friction plate 28
A ring-shaped contact portion 32 that generates a predetermined frictional force is provided on a side surface portion that comes into sliding contact with the second gear 26. A locking member 33 for preventing the disc spring 30 from coming off is mounted in the groove 34 of the friction plate 28, and a spacer 35 is attached to the locking member 33 to adjust the pressing force of the disc spring 30.
And the disc spring 30.

On the other hand, the modulator 20 is provided in a brake oil path between, for example, a master cylinder driven by a brake lever operation of a motorcycle and a caliper cylinder mounted on a disc brake of a wheel. Control of hydraulic pressure.

An eccentric shaft 10 is mounted on the rotating shaft 11. The ring body 14 mounted on the eccentric shaft 10 is in contact with a piston 24. The piston 24 performs opening and closing operations of a valve 36, and performs communication, cutoff, and hydraulic control of brake hydraulic pressure.

As shown in FIG. 2, the range of rotation of the eccentric shaft 10 is restricted by stoppers 38 and 40. Further, the coil spring 42 urges the ring body 14 of the eccentric shaft 10 so that the valve 36 is normally opened.

The antilock brake modulator 20 configured as above operates as follows.

When closing the opened valve 36,
First, the motor 4 is driven. The rotational force of the drive shaft 6 is the first
The power is transmitted from the gear 8 to the second gear 26. Since the side surface of the second gear 26 is pressed against the contact portion 32 of the friction plate 28 by the disc spring 30, the rotational force of the second gear 26 is
The power is transmitted to the rotating shaft 11 that is fitted with the spline through the shaft 8. The rotation of the rotating shaft 11 is controlled by the eccentric shaft 10, the ring 14.
, The piston 24 is displaced and the valve 36 is closed.

As described above, the antilock brake modulator 20 operates. Here, when an excessive torque of the motor 4 urges the drive shaft 6 for some reason, the second gear 26 rotates according to the excessive torque. However, since the second gear 26 and the friction plate 28 are in sliding contact with each other via the contact portion 32, if a torque greater than the frictional force due to the pressing force of the disc spring 30 is applied,
Slippage occurs between the second gear 26 and the friction plate 28, and transmission of excessive torque is prevented. Therefore, gears 8, 2
6. Damage to the friction plate 28 or collision of the ring body 14 with the stoppers 38, 40 can be prevented. On the other hand, excessive torque due to brake
Even when the rotation is performed from 4 on the rotating shaft 11, slippage occurs between the second gear 26 and the friction plate 28 in the same manner, so that excessive torque is not transmitted.

In this embodiment, the transmission of excessive torque is prevented by the friction plate 28 which is spline-fitted to the rotary shaft 11 and slidably contacts the second gear 26. Therefore, the excessive torque transmission preventing gear mechanism. 22 can be stored compactly, saving space.

[0018]

According to the antilock brake modulator according to the present invention, the following effects can be obtained.

[0019] That is, the second gear of large diameter which is continuously provided through the first gear to the drive shaft, and an eccentric shaft you abut the piston <br/> down through the ring body, dish Because the spring is connected to the second gear via a friction plate pressed by the spring , excessive torque generated on the drive shaft or the eccentric shaft can be prevented from being transmitted from one side to the other side. It is possible to reliably prevent the gears and the like from being damaged. In addition, it is easy to form the friction plate coaxially with the second gear, thereby achieving a reduction in size. Further, a stopper for restricting the control range at the time of the anti-lock braking is disposed in the deflection region of the ring body, for this strike <br/> Tsu path, excessive torque from the drive shaft side grant Never be. Therefore, damage and the stopper path, it does not cause problems such as variation in mounting position.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an antilock brake modulator according to the present invention.

FIG. 2 is an explanatory perspective view of a main part of the antilock brake modulator according to the present invention.

FIG. 3 is an explanatory perspective view of a main part of a piston crank device according to a conventional example.

[Explanation of symbols]

 4 ... Motor 6 ... Drive shaft 8, 12, 26 ... Gear 10 ... Eccentric shaft 11 ... Rotating shaft 24 ... Piston 28 ... Friction plate 30 ... Belleville spring

 ──────────────────────────────────────────────────続 き Continuing on the front page Judge, Chief Judge Yoshifumi Muramoto Judge Takashi Machida Judge Tsutomu Tokiwa (56) References JP-A-51-42862 (JP, A) JP-A-3-109154 (JP, A) JP-A-1-92094 (JP, A) JP-A-5-24525 (JP, A) JP-B-45-23615 (JP, Y1)

Claims (1)

(57) [Claims] 1. A first gear that engages with the motor (4), said motor (4) of the drive shaft (6)
(8) , the diameter of the first gear (8) is larger than that of the first gear (8) ,
A second gear meshing of the gear (8) (26), abuts on one surface of the front Stories second gear (26), the second
Friction plate (28) that rotates with the rotation of the gear (26)
Abutting against the other surface of the second gear (26),
A disc spring (30) for pressing one surface of the gear (26) against the friction plate (28), a rotating shaft (11) engaging with the friction plate (28), and the rotating shaft (11). Eccentric shaft (1)
0), a ring body (14) mounted on the eccentric shaft (10), and a piston (2) contacting an outer peripheral portion of the ring body (14).
4) , provided in the deflection region of the ring body (14);
The ring body (14) by contacting the ring body (14).
And a stopper (38, 40) for regulating the deviation range. The rotational driving force of the motor (4) is controlled by the first driving force.
Gear (8), the second gear (26), the friction plate
(28) transmitted to the rotating shaft (11),
The eccentric shaft (10) and the ring body (14) are integrated.
The stoppers (38, 40)
The piston (2) corresponding to the restricted deviation range
4) advance and retreat, and the piston (24)
(36) by opening and closing the anti-lock brake modulator which is characterized that you control the brake hydraulic pressure.