JPS6039548Y2 - plate disc brake - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a plate disc brake, which is suitable for use in agricultural machinery such as tractors, construction machinery, etc., and is capable of providing reliable braking action.

Conventionally, many tractors and the like have been equipped with internally expanding brakes, but this invention uses a new plate that provides more powerful braking action than the internally expanding brakes mentioned above, and is simple in structure and easy to assemble and disassemble. The present invention is intended to provide a disc brake, and embodiments thereof will be exemplified below with reference to the drawings.

10 is a transmission main body, and 11 is a brake cover detachably fixed to the end of the mission main body 10 via an auxiliary ring 12 with bolts 13, etc., and these parts are the fixed side of the plate disc brake.

Reference numeral 20 denotes a lever for operation, which is attached to the lower end of the brake cover 11, with one end communicating with the operating side of a tractor, etc., and the other end of the lever 20 holding a cam pin 21 and rotating an actuator 23 with a pawl 22. These parts are the movable side of the disc brake.

The actuator 23 has a cylindrical engagement protrusion 23' formed in the center thereof, which is rotatable relative to the cylindrical engagement recess 11' of the brake cover 11 and slidable in the axial direction. This makes it easy to install.

Note that the above-mentioned engagement may be carried out with the concave and convex portions reversed.

Reference numeral 14 indicates a cam receiving surface formed on the brake cover 11, and 24 indicates a cam receiving surface formed on the actuator 23. Both have shapes with gradually different depths. A spherical cam 30 is sandwiched so that a part of the actuator 23 contacts the brake cover 11, and the actuator 23 can be moved away from the brake cover 11 as the actuator 23 rotates.

Reference numeral 40 designates a bowl-shaped spring receiver fixed to the center of the brake cover 11 with a screw 41, and a coiled presser spring 43 concentric with the actuator 23 is installed between the outer periphery flange 42 and the center periphery of the actuator 23.
The spherical cam 30 is inserted by pressing the center portion 23 of the actuator toward the brake cover 11.
has been successfully maintained.

50 is a main drive shaft introduced into the transmission main body 10, and 51 is a hub gear fitted to rotate together with the main drive shaft 50.

60 is an adjustment bolt 61 screwed into a part of the brake cover 11, and a pressure plate 70 is attached to one end.
The position of the pressure plate 70 can be changed by adjusting the threaded portion 61, and the structure is such that it can cope with wear of the press-contact portion, which will be described later.

80 is a friction plate, 90 is a friction facing, and an appropriate number of plates are arranged alternately between the actuator 23 and the pressure plate 70, and one of them, the friction facing 90, is attached to the hub gear 51. The other friction plate 80 is engaged with a groove 100 formed in the transmission body 10, and when the actuator 23 is pushed by the lever 20 against the pressure of the presser spring 40, the above-mentioned friction plate 80 is engaged. The friction plate 80 and the friction facing 90 are pressed against each other so that the main drive shaft 50 can be braked.

This device is constructed as described above, and when the lever 20 is operated, the friction plate 80 and the friction facing 90, which are the pressure contact portions between the movable side and the fixed side, are brought into pressure contact by the movement of the actuator 23. The movement of the actuator 23 is performed against the presser spring 40 that presses the actuator 23 toward the brake cover 11, and the movement is performed by the spherical cam 30.
This is achieved reliably by the cam receiving surfaces 14 and 24 sandwiched between the two, and it is possible to exert a reliable and powerful braking action with a very small force on the operating side.

In particular, in this invention, the surface 14 of the cam receiver is formed directly on the brake cover 11, so the structure can be simplified compared to conventional products in which the surface 14 of the cam receiver is formed as a separate member.

Furthermore, since the actuator 23 directly engages with the brake cover 11 at the engaging concave and convex portions 23' and 11', the mounting structure between the actuator 23 and the brake cover 11 is extremely simple and easy to manufacture. Since the engaging concave and convex portions 23' and 11' are directly engaged and formed to be rotatable and slidable, the shift of the center of rotation can be completely prevented, and the operation is reliable and resistant to impact loads, etc. It also has excellent durability.

Further, since either the friction plate 80 or the friction facing 90 is engaged with the groove 100 of the transmission body, it can sufficiently withstand sudden braking torque.

Furthermore, in order to press the actuator 23 toward the pre-raw cover 11 side, a coiled presser spring 43 concentric with the actuator 23 is installed between the spring receiver 40 fixed to the brake cover 11 and the actuator 23, and the actuator 23 is Since the central part of the actuator 23 is pressed against the brake cover 11 side by the presser spring 43, the pressing force is reliable and the pressing force is not biased, and the entire actuator 23 can be pressed evenly. The entire structure can be pressed and the structure can be simplified.

Furthermore, due to the above configurations, the number of parts of the entire plate disc brake is smaller than that of conventional products, and each part can be easily assembled and disassembled very efficiently.

In particular, actuator 2 performs the brake operation function.
3. All parts such as the spherical cam 30, lever 20, and presser spring 43 are attached to the brake cover 11, and this brake cover 11 is removably formed at the end of the transmission body 10, so that the above operating functions can be performed. After previously assembling and adjusting only the parts that perform the operation function, it can be assembled into the transmission body 10 together with the brake cover 11, or the parts that perform the operation function can be removed from the transmission body 10 together with the brake cover 11 at the time of failure inspection.

Therefore, the interlocking state of the lever 20, cam pin 21, and actuator 23, and the operating state of the spherical cam 30, which require delicate adjustment and operation inspection during assembly and maintenance, can be inspected and adjusted while the above parts are assembled, and the brake This makes assembly, manufacturing, and maintenance management extremely convenient.

As mentioned above, it is very easy to use as a disc brake1, especially when used as a plate disc brake on work vehicles such as agricultural machinery such as tractors or construction machinery.
In addition to being able to smoothly switch between braking and non-braking modes, it is also easy to assemble and disassemble, and has excellent durability, which provides extremely excellent practical effects.

[Brief explanation of drawings]

The figures illustrate an embodiment of the invention, with FIG. 1 being a sectional view and FIG. 2 being a partially cutaway side view. 10...Mission body, 11...Brake cover, 14, 24...Cam receiving surface, 20
...Lever 23 ...Actuator 30 ... Spherical cam, 43 ... Holding spring, 50 ... Main drive shaft, 51 ... ...Hub gear, 70...Pressure plate, 8
0...Friction plate, 90...
・Friction facing.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. Engagement unevenness formed on opposing surfaces of a brake cover detachably fixed to the end of the transmission body and an actuator connected to an operating lever attached to the brake cover. A spherical cam is sandwiched so that the cams are rotatably engaged with each other and slidably in the axial direction, and are partially in contact with the cam receiving surfaces formed on the opposing surfaces of both the brake cover and the actuator. In addition, a coiled presser spring concentric with the actuator is installed in the center of the actuator between the spring holder fixed to the brake cover, and the actuator is pressed toward the brake cover, resisting the pressure of the spring. A friction plate and a friction facing are provided so that they can come into pressure contact with each other when the actuator is pushed with a lever.One of them is meshed with a part of the drive shaft introduced into the transmission body, and the other is inserted into the transmission body. A plate disc brake that engages with a groove portion in a main body, and is capable of braking a driving shaft by pressure contact between the friction plate and the friction facing. 2. The plate disc brake according to claim 1 of the above-mentioned utility model registration, wherein the cam receiving surfaces of the actuator and the brake cover have shapes with gradually different depths.