JPS631238B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a brake operating device for vehicles, primarily motorcycles.

Generally, in vehicles such as motorcycles, a wheel brake device such as a drum brake device and an operating member such as a brake lever are connected via an operating wire consisting of an outer wire and an inner wire, and the operating force of the operating member is transferred to the wheel brake device. With devices that transmit transmission, during use, the play stroke of the operating member may exceed a predetermined amount due to wear of the brake shoe in the brake device or elongation of the inner wire of the operating wire itself, causing the brake operation sensation to deteriorate. I don't like it because it can be changed in some way.

Therefore, the main object of the present invention is to provide a brake operating device for a vehicle, which has a simple structure and has an adjustment device interposed in the middle of the operating wire, thereby automatically and appropriately adjusting the play stroke of the operating member. The purpose is to

In order to achieve the above object, the present invention connects an operating member such as a brake lever to a wheel brake device via an operating wire consisting of an outer wire and an inner wire inserted into the outer wire, and operates the operating member. In the brake operating device for a vehicle, the outer wire is configured to operate the wheel brake device by
It is composed of first and second outer wire parts and a housing interposed between the two outer wire parts, the inner wire is passed vertically through the three parts, and the housing has an outer end attached to one of the outer wire parts. An adjusting bolt to which the housing is connected and an inner wire passing through the housing is inserted and supported so as to be non-rotatable and movable in the axial direction, and the housing further has a ratchet pawl on its outer periphery to be screwed onto the outer periphery of the adjusting bolt. an adjuster that rotatably engages with the housing, a first arm that engages with the inner wire with a predetermined free movement gap, and a second arm that is releasably engaged with the ratchet pawl. an adjustment lever that is swingably supported by the housing; a spring that urges the adjustment lever in a direction of engagement with the ratchet pawl;
The present invention is characterized in that a stopper is provided to restrict the swinging limit of the adjuster lever against the biasing force of the spring.

Hereinafter, an embodiment in which the present invention device is applied to a motorcycle will be described with reference to the drawings. The operating member provided on the handle H of the motorcycle, that is, the brake lever L, and the wheel brake device provided on the rear wheel Wr, namely The operating wire W that connects the drum brake devices B and transmits the operating force of the brake lever L to the drum brake device B is composed of an outer wire Wo and an inner wire Wi inserted through the outer wire Wo, as usual. Ru.

In the middle of the operation wire W, there is an inner wire.
Adjustment device A is installed to automatically and appropriately adjust the excess play stroke of brake lever L caused by the increase in shoe clearance due to elongation of Wi and wear of the brake shoe of drum brake device B. .

Next, when the structure of the adjustment device A is established, a two-split housing 1 is supported at a proper position on the body F of the motorcycle so as not to move in the longitudinal direction, and this housing 1 is attached to the outer wire Wo of the operating wire W.
constitutes part of. That is, the outer wire Wo is composed of a housing 1 and first and second outer wire parts w ₁ and w ₂ that are connected to each other via the housing 1, and the inner wire is inside the three parts 1, w ₁ and w ₂ . Wi runs vertically.

An adjusting bolt 2 is inserted into the housing 1 from one end thereof, and one end of a first outer wire portion _w1 connected to the drum brake device B is connected to the outer end of the adjusting bolt 2. As shown in FIG. 6, the adjusting bolt 2 is formed into an oval cross section with two symmetrical chamfers on both sides, and is fixed in a U-shaped groove 4 formed at the end of the housing 1 so that it cannot rotate.
It is inserted and supported so as to be movable in the axial direction. A cylindrical adjuster 3 is screwed into the threaded portion of the adjuster bolt 2 in the housing 1, and the adjuster 3 is engaged and supported by the housing 1 via an adjuster receiver 5 so that it can rotate at a fixed position. . Therefore, when the adjuster 3 is rotated, the unrotatable adjuster bolt 2 moves in the axial direction with respect to the housing 1, and the effective length of the outer wire Wo can be adjusted. A ratchet pawl 6 for rotating the adjuster 3 in one direction (clockwise in FIG. 5) is integrally formed on the outer periphery of the adjuster 3.

Close to the adjuster 3, an intermediate portion of an adjuster lever 7 is pivotally supported in the housing 1 by a lever pin 8, and one first arm portion ₇₁ of the adjuster lever 7 has a hook shape and is attached to the inner wire Wi. This inner wire extends to the side.
It faces an actuator 9, which will be described later, which is fixed to Wi, with an adjustment gap δ therebetween. The other second arm part ₇₂ of the adjuster lever 7 is longer than the first arm part ₇₁ , and its middle part engages with the ratchet pawl 6 of the adjuster 3, and the other end is connected to the housing 1 at one end. The other end of the tension spring 10 to be attached is locked, and the tension force of this tension spring 10 biases the adjustment lever 7 so as to rotate it in the direction of engagement with the ratchet pawl 6, that is, in the counterclockwise direction in FIG. and engages with a stopper 11 provided on the housing 1. An actuator 9 is fixed to the inner wire Wi,
A preset adjustment gap δ is formed between this actuator 9 and the tip of the first arm ₇₁ of the adjuster lever 7, and as will be described later, when the brake is operated, the inner wire Wi is moved to the left by more than the adjustment gap δ. When the actuator 9 is towed and moved, the actuator 9 collides with the first arm ₇₁ , and the adjuster lever 7 can be rotated clockwise in FIG. 2 against the tensile force of the tension spring 10. There is.

At the other end of the housing 1 (left end in Figures 2 and 3),
An adjustment mechanism Ma for the adjustment gap δ is provided. This adjustment mechanism Ma screws a collar 13 fitted into the opening at the other end of the housing 1 and a nut 14 onto a bolt 12 which is non-rotatably connected to one end of the second outer wire part _w2 on the brake lever L side. By rotating the collar 13 and the nut 14, the bolt 12 relative to the collar 13 can be expanded or contracted, that is, the length of the second outer wire portion _w2 can be adjusted, thereby adjusting the adjustment gap δ.

In FIGS. 2 and 3, rubber is used between one end (right end) of the housing 1 and the end of the first outer wire part _w1 , and between the other end (left end) of the housing 1 and the end of the second outer wire part _w2 . covered with seal boots 15, 16 made of

Next, to explain the operation of one embodiment of the present invention, in order to apply a brake to the drum brake device B, the brake operating lever L is rotated and the inner wire Wi of the operating wire W is moved in the direction of the arrow ( When pulled to the left), the operating wire W
Through this, the drum brake device B can be operated as usual to apply brakes to the rear wheel Wr.

By the way, when the brake operation is repeated, the idle stroke amount of the brake lever L during the brake operation gradually increases due to the expansion of the inner wire Wi itself and the increase in play in the shoe due to wear of the brake shoe in the drum brake device B.

The amount of idle stroke of the inner wire Wi is now
When the adjustment gap δ becomes larger than the adjustment gap δ, as the inner wire Wi is pulled to the left, the actuator 9 fixed thereto hits the first arm portion ₇₁ of the adjuster lever 7, and the lever 7 is pushed into the lever pin. 8 rotation clockwise in Figures 2 and 3.
When the brake operation of the brake operation lever L is released and the inner wire Wi is returned to the state shown in FIGS. 2 and 3 by the spring force of the return spring (not shown) in the drum brake device B, the adjustment lever 7 It is rotated counterclockwise by a tensile force of 10 and returned to its original position. By the way, the amount of movement of the engaging portion of the ratchet pawl 6 of the second arm portion 72 due to the clockwise rocking of the adjuster lever ₇ when the inner wire Wi is pulled is the same as that of the ratchet pawl 6.
When the adjustment lever 7 is rotated counterclockwise by one pitch or more, the second arm portion 7
₂ engages with the ratchet pawl 6 one position in front, and rotates the adjuster 3 by one pitch in the clockwise direction in FIG. A non-rotatable adjustment bolt 2 that is screwed into the adjuster 3 when it is rotated.
is pushed outward in the axial direction in FIGS. 2 and 3, and the effective length of the first outer wire portion _W1 between the housing 1 and the drum brake device B becomes longer, so that the inner wire Wi is pushed out to the outside in the axial direction. 1 into the outer wire portion _W1 , thereby adjusting the excess play stroke of the brake lever L due to wear of the brake shoe and elongation of the inner wire Wi itself.

While the play stroke during brake operation exceeds the adjustment gap δ, the adjustment is performed intermittently, and the play stroke is adjusted to an appropriate amount that is equal to or less than the adjustment gap δ.

As described above, according to the present invention, an operating member such as a brake lever is connected to the wheel brake device via an operating wire consisting of an outer wire and an inner wire inserted into the outer wire, and by operating the operating member, In a brake operating device for a vehicle capable of operating a wheel brake device, the outer wire is constituted by first and second outer wire portions and a housing interposed between the two outer wire portions, and the three outer wire portions are The inner wire is passed longitudinally through the housing, and an adjustment bolt whose outer end is connected to one outer wire portion and whose inner wire passes through the housing is inserted and supported in a non-rotatable and axially movable manner;
Further, within the housing, there is provided an adjuster having a ratchet pawl on its outer periphery and screwed onto the outer periphery of the adjuster bolt and rotatably engaged with the housing, and an adjuster which is engaged with the inner wire with a predetermined free movement gap. an adjustment lever that is pivotably pivoted to the housing and has a first arm portion that is attached to the housing, and a second arm portion that is removably engaged with the ratchet pawl; A spring that biases the lever in the direction of engagement with the pawl and a stopper that resists the biasing force of the spring and restricts the swinging limit of the adjuster lever are provided, thereby preventing stretching of the inner wire and wear of the brake shoe. If the idle stroke of the operating member exceeds a predetermined amount due to this, the adjustment lever swings as the inner wire engages with the first arm, causing the lever to engage with the ratchet pawl of the second arm. By shifting the position and rotating the adjuster, the adjustment bolt can be moved in the axial direction with respect to the housing and the effective length of the outer wire can be increased, so the play stroke of the operating member can always be kept below a certain value. Can be automatically adjusted. Moreover, since the automatic adjustment mechanism is interposed in the middle of the operating wire and can be installed independently from the wheel brake device and the operating member, there are no restrictions on where it can be placed in relation to the wheel brake device and the operating member. The degree of freedom of installation can be significantly increased without causing any damage.
Furthermore, it can be easily installed in existing wheel brake systems without making any structural changes to the wheel brake device or operating members. Furthermore, all of the parts that make up the automatic adjustment mechanism, such as the adjuster and adjuster lever, can be arranged compactly together in the housing that forms part of the outer wire, so that dust may adhere to them or other objects may collide with them. Otherwise, there is no risk of interference, and furthermore, the relative movement of the inner wire with respect to the outer wire can be efficiently and directly transmitted from the inner wire to the adjustment lever within the housing, so the automatic adjustment mechanism can always be operated accurately.

[Brief explanation of the drawing]

Figures 1 to 6 show one embodiment of the device of the present invention. Figure 1 is a side view of a motorcycle equipped with the device of the present invention, Figure 2 is a vertical side view thereof, and Figure 3 is a side view of a motorcycle equipped with the device of the present invention. FIG. 4 is a cross-sectional view along the line of FIG. 2, FIG. 5 is a cross-sectional view along the line of FIG. 2, and FIG. 6 is a cross-sectional view along the line of FIG. A...adjustment device, B...wheel brake device (drum brake device), L...brake lever, W...operation wire, Wi, Wo...inner wire, outer wire, _w1 , _w2 ...first and second outer wire parts, δ...
Gap, 1...housing, 2...adjustment bolt,
3... Adjuster star, 6... Ratchet claw, 7... Adjuster lever, 7 ₁ , 7 ₂ ... First and second arm parts, 1
0...Spring, 11...Stopper.

Claims (1)

[Claims] 1. An operating member such as a brake lever L is connected to the wheel brake device B via an operating wire W consisting of an outer wire Wo and an inner wire Wi inserted into the outer wire Wo, and the wheel brake device is activated by operating the operating member. In the brake operating device for a vehicle, the outer wire Wo is connected to the first and second outer wire portions w ₁ , w ₂ and both outer wire portions w ₁ ,
w Consisting of a housing 1 interposed between ₂ ,
The inner wire is inside the three parts w ₁ , w ₂ , 1.
An adjusting bolt 2 is provided in the housing 1, the outer end of which is connected to one outer wire portion _w1 , and the inner wire Wi passes through the inside of the housing 1.
is inserted and supported so as to be non-rotatable and movable in the axial direction, and the housing 1 further has a ratchet pawl 6 on its outer periphery, which is screwed onto the outer periphery of the adjuster bolt 2 and rotatably engaged with the housing 1. The first arm part 7 ₁ can be engaged with the inner wire Wi with a predetermined free movement gap δ, and the second arm part 7 ₂ can be removably engaged with the ratchet pawl 6. an adjustment lever 7 pivotably supported 8 on the housing 1; a spring 10 that biases the adjustment lever 7 in the direction of engagement with the ratchet pawl 6; and a biasing force of the spring 10. A brake operating device for a vehicle, characterized in that a stopper 11 is provided for regulating the swing limit of the adjuster lever 7 against the oscillation.