JPS59134035A - Parking brake - Google Patents

Abstract

PURPOSE:To simplify structure and to reduce cost by coupling the first shaft to be decelerated through a drive section and second shaft to be coupled to the parking brake operating section through a oneway clutch having manual releasing mechanism. CONSTITUTION:First shaft 3 is decelerated by a drive section comprised of a reversible motor 1, worm 2 and wormwheel 4. Second shaft 5 is provided while facing with the first shaft 3 and a manual operation parking pedal 6 in parking brake operating section is secured to said shaft 5. Furthermore a oneway clutch 10 is provided at the joint between the first and second shafts 3, 5. Said oneway clutch 10 is comprised of ratchet wheel 11 to be fixed to the end of first shaft 3, outer race 12 to be inserted with said wheel 11 and manual releasing mechanism 16 where a knob 13 is projected from the outercircumference of outer race 12 to stop a pole 14 at the leading edge at the ratchet wheel 11.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bark brake that can be brought into a parked state and a released state either automatically or manually.

BACKGROUND OF THE INVENTION A conventional bark brake that can be parked and released automatically and manually has been proposed in US Pat. No. 2,821,275.

The first mechanism shown in this patent consists of two solenoids: a large solenoid connected to a plunger near the pivot point of the manual parking brake pedal, and a small solenoid for releasing a latch engaged with a ratchet at the upper end of the pedal. is provided, and an extremely large large solenoid is required, which is thought to be difficult to implement, and has the drawback of increasing the cost.

Furthermore, the second mechanism not only requires a separate solenoid to rotate the worm that engages with the ratchet teeth at the upper end of the parking brake pedal using a single motor, and disengage the engagement between the worm and the ratchet teeth. The teeth of the ratchet and worm must be machined into a special tooth shape, and the engagement between the two is pressed by spring force, so when an impact is applied, the engagement between the worm and ratchet teeth disengages, causing the brake to break. There was a drawback that it would be canceled.

SUMMARY OF THE INVENTION An object of the present invention is to provide a parking rake that can be parked and released automatically and manually by providing a one-way clutch equipped with a manual release mechanism, thereby eliminating the drawbacks of the prior art.

In order to achieve the above object, the present invention fixes the one-way clutch by a single reversible motor via a worm formed on the shaft of the motor and a worm wheel that meshes with the worm. a drive unit that decelerates and drives a first shaft, and a second shaft that is opposite to the first shaft;
The parking brake operating section interlocks with the axis of the parking brake, and the first
, consists of a one-way clutch with a manual release mechanism installed at the joint of the second shaft, and when the motor rotates forward, the rotation of the Won wheel shaft is transmitted to the parking flake operation unit via the one-way clutch, and the brake is activated. The vehicle is in a parked state, and the brake is maintained by the self-locking action of the worm wheel and worm.

On the other hand, when the motor is reversed, the worm wheel and
The shaft of the clutch is reversed, and this rotation is transmitted to one rotating member of the one-way clutch, and the other rotating member of the clutch follows this and rotates due to the reaction force of the flake, so that the flake is automatically released.

Also, if the motor breaks down and you have to manually apply the parking flake, when you manually operate the parking flake operating section, the other rotating member of the one-way clutch will rotate independently from the one rotating member. Since it can rotate, the parking brake can be applied manually and released by operating the manual release mechanism of the one-way clutch to disengage the one rotating member and the other rotating member, and easily release it using the brake reaction force. .

Therefore, the present invention' requires only one reversible motor, and since the parking rake is held using the self-locking action of the worm wheel and worm,
There is no need to form ratchet teeth on the bark brake pedal and provide a latch to lock the brake pedal as in the past, the structure is simple, there is no disadvantage of high cost, and automatic and manual operation is possible. The parking brake state and the flake release state can be changed quickly and easily.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view, FIG. 2 is a sectional view taken along line A-A in FIG.
-B sectional view and FIG. 4 are electric circuit diagrams for driving the motor. First, in Figures 1 to 8, (1) is a reversible motor, and a worm (2) is formed on the motor shaft. The worm wheel (4) is engaged.

The motor (1), the worm (2), and the worm wheel (4) constitute a driving section 14 that decelerates and drives the first 11411 (3).

(5) is a second shaft provided opposite to the first shaft (3), and a manual operation bar kink pedal (6) is fixed to the shaft (5). 6) is connected to the parking brake via a cable clevis (8) (not shown).This manual operation bar kink pedal (6) and cable wire (7)
) constitutes the parking brake operating section. Also the first
The shaft (3) and the second shaft [5] are rotatably supported by a bearing (9).

00) is a one-way clutch provided at the joint between the first shaft (3) and the second shaft (5), and is a ratchet that constitutes one rotating member at the end of the first shaft (3). A toothed ring 01), an outer race (12) which constitutes the other rotating member provided at the end of the second shaft (5) and which has an inner diameter hole into which it is inserted (like a ratchet toothed ring), and a core. A knob (13) protrudes from the outer periphery of the outer race (12), and a manual release mechanism α6) is always biased by a spring (15) so as to engage the teeth of a pawl (04) at the tip or a ratchet gear (like a ratchet wheel). Although Fig. 1 shows an example in which a bar kink pedal (6) is provided, it is not necessary to use a pedal type as long as the wire is pulled by operation. A stick type plunger type or the like may be used.

Next, Figure 4 is the electric circuit diagram of the reversible motor (1), 07
) is a pedal return switch that turns on when the bark pedal (6) is depressed, and (18) is a shift lever switch that turns on when it detects the driving shift position of the transmission such as drive, reverse, second, low range, etc. a9)
is an accelerator pedal switch that turns on when you press the accelerator pedal.

In addition, (20) is a vehicle speed sensor that turns on when the vehicle speed is 5 km/h or less. , a tension switch that moves from the illustrated The manual switch (t25) is a parking brake lamp that lights up when the tension switch (2υ or Y side contact is connected).

Next, I will explain the use of R. First, when applying the bark brake automatically, move the manual switch (2z) to the j point (23) side, and then turn the tension switch (2υ to Y
Since it is on the side, the manual switch (22) is self-held by completing the circuit passing through 2 and υ and operating the relay (24J. At the same time, the manual switch +22), vehicle speed sensor t2Q+, reversible motor (
1), the reversible motor (1) rotates in the direction of the arrow, and the reversible motor (1) rotates in the direction of the arrow. The ratchet tooth ring αυ rotates in the direction of the arrow.

When the ratchet gear side rotates in the direction of the arrow, the pawl (1
4), the bar kink pedal (6) rotates in the direction of pulling the goofle wire (force) through the second shaft (5), and Parking brake operates.

If motor (1) continues to rotate forward in this state, 1.
When the parking brake is fully applied and the tension of the goofle wire (7) increases and exceeds a predetermined value, the tension switch 121) moves to Y/ILU, and the relay (24) is activated to open the circuit passing through the relay. The manual switch (z2) moves away from the contact (23) and returns to the illustrated position. Therefore, the forward rotation circuit a opens, and the motor (1) stops forward and forward transmission, but the parking flake is in its deviated state, or the worm (2) and the worm wheel (4
) is held by the self-locking action.

Next (To start from a stationary state, first, just like a normal start, for example, enter the drive range, press the accelerator pedal, shift lever switch α ~ turns on, and switch 19) or turn on.

At this time, the parking pedal (6) is depressed due to the operation of the parking brake described above, so the pedal return switch (care) is on, so the reversing circuit is completed and the motor (1) reverses. .

When the motor (1) reverses, the worm (2) and the worm wheel (4) rotate in the direction opposite to the arrow, and the ratchet tooth ring 01) also rotates in the direction opposite to the arrow, or the second shaft (
5) and the outer race (12) are constantly trying to rotate in the direction opposite to the arrow in Fig. 3 through the goofle wire (7) due to the reaction force of the parking flake.
When 1) rotates in the opposite direction to the arrow, the pawl U.0 holds the locking position with the ratchet teeth and rotates the outer race (
12) in the same direction, and eventually the parking pedal (
6) returns to its original position, the goofle wire (7) is loosened, and the parking flake is released.

The above is a case where the parking flake is automatically parked and released by 1, or if the reversible motor (1) breaks down, the parking flake is released by manual operation.
It is now possible to release it again.

To manually apply the parking brake, depress the first spark kink pedal (6). Due to this t'L, the second
Either the outer race (12) rotates in the same direction as the arrow in Fig. 3 through the shaft (5), or the ratchet tooth ring side does not rotate, so the pawl Oa or the top of the ratchet teeth engages with the teeth one after another. In other words, it acts as a one-way clutch.

Therefore, the goofle wire (7) is pulled and the parking flake is caught. In this state, even if you release your foot from the bark pedal (6), the pawl f14) and the ratchet teeth are locked, and the one-way clutch operates in the opposite direction as described in @, and the worm wheel (4) and worm (2) are engaged. Due to the self-locking action, the second shaft ('5) does not rotate and the flake is held.

Next, to manually release the brake, use the nof (13
) outward, it will disengage from the ratchet teeth of the pawl (1 and 0) and the second shaft (5) and outer race (1
2) is reversely rotated by the brake reaction force transmitted from the cable wire (7), the bark pedal (6) returns to its original position, the cable wire (7) is loosened, and the parking brake is released.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a bark brake showing an embodiment of the present invention, Fig. 2 is a cross-sectional view taken along line A-A in Fig. 1, Fig. 8 is a cross-sectional view taken along line B-B in Fig. 1, and Fig. 4 is a cross-sectional view taken along line B-B in Fig. 1. FIG. 2 is an electrical circuit diagram of the reversible motor of FIG. 1; Explanation of the main parts of the diagram■... Reversible motor 2... Worm 8... First shaft 4... Worm wheel 10... Runway clutch 11... Ratchet gear 12... Outer race 14... Paul 15...
, Spring 16...Manual release area purchase special
Applicant: Aisin Seishi Co., Ltd. Figure 1 Figure 2

Claims (1)

[Claims] a drive section that uses one reversible motor to reduce and drive a first shaft fixed to the worm wheel via a worm provided on the shaft of the motor and a worm wheel that meshes with the worm; A parking brake operating section interlocked with a second shaft opposite to the first shaft, and a manual release mechanism provided at a joint between the operating section and the driving section and the first and second shafts. A bark brake featuring a one-way clutch.