JPH0239060Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is a floating disc brake that is mounted vertically for the purpose of directly braking a vertical rotating shaft such as a rotating shaft of a crane or a blade shaft of a Darrieus type wind turbine. The present invention relates to a floating type disc brake that eliminates the so-called friction material dragging phenomenon in which the friction material comes into contact with the disc rotor and weakens the rotational force of the rotor during non-braking.

[Conventional technology and its problems] A floating type disc brake, in which one side of the friction material that clamps the disc rotor is pressed by an actuator, and the other is pressed by the part of the caliper that straddles the disc rotor that slides by reaction force, is vertically moved. When installed and used, it is necessary to push the caliper back to its original position when the brake is released to prevent the friction material from dragging when the brake is not applied.

However, the drag prevention mechanism adopted in general floating disc brakes is either a seal retraction mechanism that utilizes the elasticity of the piston seal or a mechanical retraction mechanism as shown in Japanese Patent Publication No. 7697/1983. Both mechanisms are designed to pull back only the friction material on the actuator side when the actuator returns. In other words, in the case of horizontal installation, the caliper also returns when the actuator returns, and both friction materials separate from the rotor. However, if it is installed vertically, the restoring force of the retract mechanism is overcome by the caliper's own weight, causing the caliper to droop. This leads to drag.

For this reason, in vertically mounted floating disc brakes, a method is generally adopted in which a hydraulic balance chamber is provided in the sliding part of the caliper, and the hydraulic pressure introduced into the chamber is used to return the caliper to its original position when not braking. .

However, a disc brake provided with a hydraulic balance chamber has the disadvantage that the structure is complicated and the dimensions of the sliding portion are large, and the labor and cost required for manufacturing are also increased.

[Means for solving problems]

Therefore, this invention adopted a retract mechanism similar to the mechanical retract mechanism shown in Japanese Patent Publication No. 7697/1983 in the sliding part of the caliper to reduce the drag torque associated with vertical installation without causing the above-mentioned drawbacks. It is.

Specifically, on the outer periphery of the slide pin that is fixed to the fixed object (fixed member or caliper) and guides the movement of the caliper, there is a coiling bushing that has enough sliding resistance to support the weight of the brake, and a coiling bush that has enough sliding resistance to support the weight of the brake. A bushing housing that is fixed at the end of the coiling bush that approaches the fixed object during braking with a certain axial spacing between them, and one end supported by the bushing housing and the other end supported by the fixed object. This floating type disc brake is characterized by a structure in which an elastic body is fitted onto the outside, and the elasticity of the elastic body pushes the caliper up a certain amount from the braking position when not braking, and it can also be changed to a horizontal mounting method. It was made easy.

〔Example〕

The attached drawings show an embodiment of this invention. This figure shows a so-called fail-safe type disc brake.

The symbol D in the figure is a disc rotor fixed to the rotating shaft.
1 and 1' are friction pads that clamp the rotor,
2 is a caliper composed of an inner part 2a and an outer part 2b that straddles the rotor and faces the inner part, and the pads 1 and 1' have pad pins 3 suspended between the inner part and the outer part passed through the back plate. It is slidably supported. Outer pad 1'
As shown in FIG. 1, the inner pad 1 is held by the caliper, and the side of the inner pad 1 is supported by a torque member 4 having the shape shown in FIG. 3, so that the surface 4a receives the braking torque. ing.

Also, a piston 5 that presses the inner pad 1
As shown in FIG. 2, the push rod 6 comes into contact with the annular shoulder 6a of the push rod 6 and is fixed by a retaining ring 7 at the tip of the rod that passes through the center. The rear end of the push rod 6 is in contact with an adjusting bolt 9 screwed into the spring housing 8, and when the bolt 9 is manually rotated, the piston 5 is advanced through the rod 6 according to the amount of wear on the pad. It is set as.

The spring housing 8 is moved backward by the hydraulic pressure introduced into the cylinder chamber 12 (the hydraulic pressure inlet thereof is not shown) formed between the large diameter part in which the seal 10 is fitted and the small diameter part in which the seal 11 is fitted. The thrust causes the piston 5 to move backward and release the braking state.
Further, the housing 8 is urged forward by the elasticity of a disc spring 14 compressed between its large diameter portion and a seat plate 13 supported by a caliper, and the hydraulic pressure in the cylinder chamber 12 is reduced. Push out the piston 5 to press the pad against the rotor. 15 in FIG. 2 is an air bleeder.

Next, the structure of the sliding portion, which is a feature of the invention, will be explained based on FIG.

The caliper 2 is slidably held by inserting a slide pin consisting of a sleeve bolt 16 whose one end is screwed into the torque member 4 and a sleeve 18 which is fitted onto the bolt and hermetically sealed both ends with a boot 17 into the inner part. has been done. Further, the sliding portion of the caliper is provided with a storage chamber 19 for each member to be described later that is fitted onto the sleeve 18, and the opening thereof is closed by a cap 20 that supports one end of one boot 17.

The member that is fitted onto the sleeve 18 and stored in the storage chamber 19 is a coiling bush 21 that has sufficient sliding resistance between it and the sleeve to support the weight of the brake, and a coiling bush 21 that is locked to the rotor side end of the coiling bush 21. The bush housing 22 and the coil spring 2 interposed between the flange of the housing and the end surface of the storage chamber 19.
3, the elasticity of the spring 23 supported by the bushing housing 22 is applied upward to the caliper, and this force holds the caliper in a position where it has always moved upward by a gap when not braking. That is, during braking, the caliper is pushed down by a stroke of (initial pad gap) + Δ (pad wear amount) from the solid line position in FIG. 1 due to the reaction force caused by the pressure of the pad 1 against the rotor. When the stroke at this time is completed, the caliper comes into contact with the bushing housing 22, and during the subsequent movement of Δ, the bushing 21 and the housing 22 also move following the caliper. Then, when the brake is released,
The spring 23 compressed during braking is restored and strokes the caliper upward, starting from the housing 22. Therefore, the amount by which the caliper is pushed up is kept constant regardless of the amount of wear on the pad, and the pad 1' does not come into contact with the rotor under the weight of the caliper.

In addition, in a brake equipped with a plurality of slide pins as shown in the figure, each slide pin may be provided with the above-mentioned return mechanism, and if the urging force of the caliper by the spring 23 is reversed to that shown in the figure, the inner part of the caliper can be placed above the rotor.

Furthermore, some floating disc brakes have a slide pin fixed to the caliper and slidably inserted into the torque member. The same effect as above can be obtained. Reference numeral 24 in FIG. 3 is a bolt that fastens the inner part and outer part of the caliper.

〔effect〕

As mentioned above, the disc brake of this invention has a coiling bushing and a bushing housing with appropriate sliding resistance fitted around the slide pin,
Using this as a foothold, we used the elastic body's elasticity to push up the caliper a certain amount against its own weight when not braking, thereby ensuring the wear compensation function of the friction material without complicating the structure. , it is possible to reduce the drag of the friction material due to the brake's own weight when vertically mounted, without increasing costs.

In addition, since the coiling bushing etc. are externally fitted onto the slide pin, there is no need to worry about unduly increasing the dimensions of the brake.Furthermore, the coiling bushing etc. that make up the return mechanism can be removed without modifying the brake. It is also possible to change to a horizontal mounting method.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view of a brake according to an embodiment of this invention, viewed from the outer periphery of the rotor toward the center of the rotor, and FIG. 2 is a sectional view taken along line A-A.
FIG. 3 is a bottom view. 1,1'...Patsudo, 2...Calipa, 3...
Pad pin, 4... Torque member, 5... Piston, 6... Push rod, 8... Spring housing, 9... Adjustment bolt, 12... Cylinder chamber, 13... Seat plate, 14... Belleville spring, 16
...Sleeve bolt, 18...Sleeve, 20...
... Cap, 21 ... Coiling bush, 22
...Button housing, 23...Coil spring, 24...Tightening bolt.

Claims (1)

[Scope of utility model registration request] In floating type disc brakes, one side of the friction material that clamps the disc rotor is pressed by an actuator, and the other is pressed by the part of the caliper that straddles the disc rotor that slides by reaction force. A coiling bush with sufficient sliding resistance to support the weight of the brake is installed around the outer periphery of the slide pin that is fixed and guides the movement of the caliper, and a coiling bush is installed with a fixed axial distance between it and the fixed object. A bushing housing that locks at the end on the side approaching the fixed object during braking, and an elastic body whose one end is supported by the bushing housing and the other end supported by the fixed object, and the elastic body of the elastic body is A vertically mounted floating disc brake characterized in that when not braking, the caliper is pushed up a certain amount from the braking position, which is displaced as the friction material wears.