JPH02163526A - Dead man type disk brake - Google Patents

Abstract

PURPOSE:To surely ensure always a braking force for a brake rotor by shifting eccentrically the axes of a pair of adjust bolts abutting against a cam from the rotary center of the cam longitudinally of a brake lever in a direction opposite to each other. CONSTITUTION:As the wear between brake pads 11a, 11b progresses gradually, the gap between brake levers 3a, 3b in braking is narrowed. Since even in such case the axes of adjust bolts 21, 23 are shifted eccentrically by a distance L longitudinally of the brake levers 3a, 3b from the pivotal center 0 of a cam 25 in the opposite direction to each other, the movement of the adjust bolts 21, 23 are absorbed smoothly. Thus, a braking force for a brake rotor can be always surely ensured.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a Chitman type disc brake used primarily in industrial vehicles such as forklifts.

2. Description of the Related Art As an example of a conventional Dettman type disc brake, for example, Japanese Utility Model Publication No. 59-27335 discloses a structure shown in FIG. In other words, 1 is a brake rotor that rotates together with the wheel, and 3a and 3b are a pair of brake levers, and these brake levers 3a and 3b rotate about an anchor pin 9 with respect to a support member 7 fixed to a member on the side of the vehicle body. possible to be pivoted. This brake lever 3a
.

Brake butt washers 10a, 1. Ob and the brake pad washer IQa, 10
A brake pad 1la11b fixed to b is fixed using fixing bolts 12, 1.2. 13 more
is the brake rod, 15 is the J-turn spring,
The brake rod 13 is disposed to pass through openings 4a and 4b formed in the brake levers 3a and 3b, and a stopper 1 is provided at one end of the brake rod 13.
A spring seat 19 is fixed to the other end of the brake rod 13, and the return spring 15 is inserted between the spring seat 19 and the brake lever 3b. That is, the return spring 15 is biased with an elastic force that constantly presses the brake levers 3a, 3b against the 7' rake rotor 1.

On the other hand, reference numerals 2], 23 are a pair of adjustment bolts screwed onto the brake levers 3a, 3b, and a cam 25 is disposed between the adjustment bolts 1-2], 23. 2
7.29 is an adjustment lever. Moreover, the cam 25
is connected to a rod 33 via a pull lever 31 supported coaxially, and the other end of the rod 33 is connected to a brake pedal via a linkage member (not shown).

Reference numeral 35 denotes a spring whose one end is connected to the bush lever 31 and the other end is connected to the vehicle body, and the biasing force of the spring 35 maintains the force 1.25 in the illustrated state.

-l: i own cam 25 and adjustment bolt 2], 2
3, a predetermined clearance ρ, l! is set.

The above adjustment bolt 21.23 and Nonom 25,
A bushing lever 31 coaxially supported by the cam 25 constitutes a brake release means for moving the pair of brake levers 3a and 3b away from the brake rotor 1.

According to such a configuration, when the driver is not pressing the brake pedal, the force is in the illustrated state D due to the action of the spring 35, and therefore the return sprinter N5 and the brake rotor N5 are in the state shown in FIG. Based on the action of the brake levers 3a and 3b, the brake levers 3a and 3b are pressed against the surface of the brake rotor 1 to provide braking force to the wheels, while the driver When the brake pedal is depressed, this pedal force is transmitted to the bushing lever 31 via a linkage member and rod 33 (not shown), and the bushing lever 31 starts rotating against the elastic force of the spring 35.

Therefore, the cam 2 supported coaxially with the bush lever 3j
Since the cam 25 rotates around the center of rotation, the adjustment bolts 21 and 23 located in the vicinity of the cam 25 are pushed in a direction away from each other, that is, in the case shown in the figure, in a downward direction.
The brake levers 3a, 3b open around the anchor bin 9, and the brake pads 1.1. a. 1.1.
b separates from brake rotor 1, and brake rotor 1
The braking force is released.

The predetermined clearances σ and ρ set between the cam 25 and the adjustment bolts 21 and 23 are essential for reliably transmitting the pressure contact force of the brake pad l1a111) to the brake rotor 1, and Clearance C
, i2 will gradually become smaller depending on the state of wear when the brake pads l"Ila,llb wear out during use, so in such a case, operate the adjustment levers 27 and 29. Adjustment bolt 2], 23
The screwing positions of the brake levers 3a and 3b are adjusted so that the clearances ρ and Q are always maintained at constant values.

Problems to be Solved by the Invention However, in such a conventional Chitman-type disc brake, the brake pads lla and l are damaged during use.
When lb is worn out, manually adjust the rotation of °r Justol 1-21.23 to adjust the clearance ρ,
Since ρ must always be kept at a constant value, there is a drawback that the operation is cumbersome, and furthermore, if the rotation of the adjustment bolt 2123 is not adjusted,
Brake pads 1.1. a. 1.1. As the wear of brake levers 3a and 3b progresses, the front three self-clearances Q and ρ become O, and the force of the return spring 15 or the brake levers 3a and 3b
There was a problem that the braking force could not be transmitted to the wheels without being transmitted to the wheels.

Therefore, the present invention solves the problems of the conventional Chitman type Tiski brake, eliminates the need for adjusting the clearance pH2, and eliminates the need for adjusting the clearance pH2, and also eliminates the need for adjusting the clearance pH2 until the brake pad is completely worn out. The object of the present invention is to provide a Chitman type disc brake that can ensure stable braking force.

Means for Solving the Problems In order to achieve the above object, the present invention has a brake rotor fixed to the wheel side, and a brake pad fixed to a part supported by the vehicle body side and holding the brake rotor. A pair of brake levers, a spring device with an elastic force that constantly presses the brake levers against the brake rotor, and a brake release device that moves the pair of brake levers away from the brake rotor in conjunction with the brake pedal. and the brake release means is a detman type comprising a pair of adjustment bolts fixed to the brake lever, and a cam arranged on the adjustment bolts and rotated by a force in a rotational direction applied from the outside. In the disc brake, the axes of the pair of unrest bolts that contact the cams in item 1 are eccentric from the center of rotation of the cams in opposite directions along the longitudinal direction of the brake lever. be.

According to this structure, when the driver is not pressing the brake pedal, the brake release means for separating the pair of brake levers from the brake rotor does not operate.
Based on the action of the spring means, a brake pad fixed to the brake lever is pressed against the brake rotor, and a braking force is applied to the wheel.

Next, when the driver depresses the brake pedal, this depressing force activates the brake release means comprising the cam and adjustment bolt, thereby releasing the braking force on the brake rotor.

Next, if the brake pads wear out during long-term use, the distance between the brake levers during braking will become narrower, and the distance between the 'C adjustment ports will become narrower accordingly. Since the axes of the adjustment bolts are eccentrically arranged in opposite directions from the center of rotation of the cam along the longitudinal direction of the brake lever, the adjustment bolt is rotated by the rotation of the cam in contact with the adjustment bolt. The movement of the bolt is easily absorbed.

Therefore, there is no need to make any adjustments to the adjustment bolt until the brake pads are completely worn out.
Braking force for the brake rotor can be ensured.

Embodiment Hereinafter, with reference to FIG. 1 of the drawings, an embodiment of a dead man type disc brake according to the present invention will be described in detail by assigning the same reference numerals (=t) to the same components as those of the conventional structure.

In the configuration shown in FIG. 1, 1 is a brake rotor that rotates together with the wheels, 3a and 3b are a pair of brake levers, and this brake lever 3a + 3b is anchored to a support member 7 fixed to a vehicle body side member. It is rotatably supported around the bin 9. Brake pad washers 10a, 1Qb and the brake butt washers are provided inside the brake levers 3a, 3b and at opposing positions. O
a, 101)
It is fixed using the fixing port l-1.2.12.

13 is a brake rod, 15 is a return spring, and 2 brake rod 13 is a brake lever 3.
It is disposed to pass through openings 4a and 4b formed in the brake rods 1 and 3b, and a stopper 17 is provided at the end of the brake rod 13. A spring seat 19 is fixed to the other end of the brake rod 13, and the return splinter 5 is inserted and supported between the spring seat 19 and the brake lever 3b. In other words, the brake lever 3 is on the return splinter 5.
There is an elastic force that constantly presses a3b against the brake rotor 1.

Method 2]. ．． , 23 are a pair of unjasted bolts screwed and fixed to predetermined portions of the brake levers 3a, 3b, and a cam 25 is disposed between these bolts. That is, the tips 21a and 23a of the adjustment bolts 21.23 are located at a portion that constantly contacts the cam 25 from the -L surface and the bottom surface of the cam 25, and the axes of the pair of adjustment bolts 21.23 are The brake levers 3a and 3b are eccentrically offset from the center of rotation of the cam 25 by a distance of 1 along the longitudinal direction of the cam 25 in opposite directions.

Further, a bushing lever 31 is attached to the cam 25 with a tightening tool 32.
The bush lever 31 is fixed coaxially using
The other end 31a is pivotally supported by one end of the piston rod 37.

Therefore, the above-mentioned adjustment bolt 2123 and cam 25, and the Phunon lever 31 coaxially fixed to this cam 25.
A brake release means 50 for separating the pair of brake levers 3a, 3b from the brake rotor 1 is constituted by these.

On the other hand, 39 is a hydraulic cylinder, and the hydraulic cylinder 39
is supported by the brake lever 3a or a vehicle body side member (not shown). The hydraulic cylinder 39 includes a cylinder body 41, a piston 43 inserted into the cylinder body 41, a spring 45 that applies a preset pressing force to the piston 43, and a hydraulic fluid input boat 47. and a dust cover 49, and the other end of the piston rod 37 is fixed to the eye piston 43.

Further, the -1- input boat 47 is connected to a branch of a mask cylinder (not shown) that generates brake fluid pressure.

The elastic force of the spring 45 built into the cylinder body 41 is set in advance to be extremely small compared to the elastic force of the return spring 15.

According to the configuration of the present invention, when the driver is not pressing the brake pedal (not shown), brake hydraulic pressure is not supplied from the mask cylinder 1 to the input boat 47 of the hydraulic pressure/link 39, so that the hydraulic pressure is not supplied to the input boat 47 of the hydraulic pressure/link 39. Since the piston rod 37 is biased to the left by the moderate elastic force of the spring 45 built into the pressure cylinder 39, the cam 25 is in the state shown in the figure, and therefore the return spring 15 and the return spring 15 having a strong elastic force are Brake pads L fixed to brake levers 3a, 3b based on the action of brake rod 13
la and Ilb are pressed against the surface of the brake rotor I,
Braking force is provided to the wheels.

Next, when the driver depresses a brake pedal (not shown), hydraulic pressure generated from a mask cylinder (not shown) enters the cylinder body 41 from the input boat 47 and pushes the piston 43 to the left in the drawing. Then, the piston rod 37 and the bushing lever 3 pivotally supported on one end of the piston rod 37
Based on the operation of step 1, the cam 25 rotates counterclockwise,
Therefore, the adjustment bolt 21 that is in contact with the cam 25
23 are pushed in directions away from each other, that is, upward and downward in the case shown, so that the brake levers 3a, 3b open around the anchor pin 9, and the brake pads 1.1. a
, 1.1. b separates from the brake rotor 1,
The braking force on the brake rotor 1 is released.

Next, during long-term use, the brake pad 1], a,
11. Assume that b is worn out. i.e. brake pad], 1a, 11. As the wear of the brake levers 38 and 3b gradually progresses, the distance between the brake levers 38 and 3b during braking becomes narrower, and the distance between the adjustment bolts 2] and 23 becomes narrower accordingly. Since the axes of the adjustment bolts 21 and 23 are eccentric from the rotation center 0 of the cam 25 in opposite directions by a distance along the longitudinal direction of the play-1 levers 3a and 3b, Cam 2 that adjust bolt 2L23 is in contact with
5 by rotating the adjustment bolt 21 in the clockwise direction.
．． 23 movements are easily absorbed. At this time, in conjunction with the clockwise movement of the cam 25, the piston rod 37 supported by the bushing lever 31 moves rightward. As it operates, excess hydraulic fluid passes through the return port of the mask cylinder from the input capo 47 and flows back into the reservoir tank (not shown). Therefore, the braking force for the brake rotor 1 can be reliably ensured without straining the flow of hydraulic pressure.

As explained in detail below, the Dettman type disc brake according to the present invention includes a brake rotor fixed to the wheel side and a brake rotor supported to the vehicle body side and supporting the brake rotor. a pair of brake levers to which pads are fixed; a spring means biased with an elastic force that constantly presses the brake levers against the brake rotor; The brake releasing means is arranged between a pair of adjustment bolts fixed to the brake lever and the adjusting bolts and is rotated by a rotational force applied from the outside. In a Dettmann type disc brake consisting of a moving cam, the axes of the pair of adjustment bolts that contact the cam are eccentrically moved in opposite directions along the longitudinal direction of the brake lever from the rotation center force of the cam. This configuration provides the following effects. That is, when the driver is not pressing the brake pedal, the brake release means for separating the pair of brake levers from the brake rotor does not operate. The brake pads are pressed against the brake rotor and provide braking force to the wheels. On the other hand, when the brake pedal is depressed, this depression force causes the above-mentioned force l\ and anyasu! A brake release means consisting of four buttons is activated to release the braking force on the brake rotor.

Furthermore, even if the brake pads are worn out during long-term use and the distance between the brake levers during braking becomes narrower, and the distance between the adjustment bolts becomes narrower, the adjustment bolts will not come into contact with each other. The movement of the adjustment bolt can be easily absorbed by the rotation of the cam. Therefore, adjust until the brake pads are completely worn out!・It has the advantage of not requiring any sophisticated adjustment means, and eliminates the habit of causing a situation where the braking force to the wheels becomes ineffective during use, and ensures the braking force to the brake rotor at all times. can be secured.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part showing an embodiment of a Dettmann type disc brake according to the present invention, and FIG. 2 is a sectional view of a main part showing an example of a conventional Dettman type disc brake. 1... Brake rotor, 3a, 3b... Brake lever, 7... Support member,
9... Anchor bin, lla, llb... Brake pad, 13... Brake rod, 15... Return spring, 19... Spring seat, 21.23... Adjustment bolt, 25... Cam , 31... Bush lever 37... Piston rod, 39... Hydraulic cylinder, 43... Piston, 45...
Sfring, 47... input boat,

Claims (1)

[Claims] (1) A brake rotor fixed to the wheel side, a pair of brake levers supported by the vehicle body side and having brake pads fixed to the parts that clamp the brake rotor, and the brake levers are connected to the brake rotor. It comprises a spring means biased with an elastic force that constantly presses the brake lever, and a brake release means that moves the pair of brake levers away from the brake rotor in conjunction with the brake pedal,
In a Dettman type disc brake, the brake release means includes a pair of adjustment bolts fixed to the brake lever, and a cam arranged between the adjustment bolts and rotated by a rotational force applied from the outside, A deadman type disc brake characterized in that the axes of the pair of adjustment bolts that contact the cam are eccentric from the center of rotation of the cam in opposite directions along the longitudinal direction of the brake lever.