JPH0112017Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a pressure plate mounting structure for a plate disc brake, and allows the pressure plate to be mounted to the brake housing very easily and at low cost.

Conventionally, brakes for agricultural tractors, construction machinery, etc. have been made using actuator rotation as brakes that produce less brake noise during braking, have excellent durability, and can provide reliable braking force. It has a spherical cam mechanism that converts a dynamic motion into a moving motion in the axial direction, and a friction plate engaged with the brake housing is provided between the actuator and a pressure plate fixed to the brake housing. , plate disc brakes equipped with a disc plate that rotates together with the brake shaft have become popular.

However, the pressure plate described above can be attached to the brake housing by bolting several points on the outer periphery of the pressure plate to the end face of the brake housing, or by attaching the pressure plate fitted to the inner periphery of the brake housing with C. Since the retaining ring for the shaft is prevented from coming off, in the former case, the assembly work is troublesome, and in the latter case, the cost burden due to the retaining ring for the shaft is large.

Therefore, in this invention, we provide a pressure plate mounting structure that can solve the above-mentioned conventional drawbacks with a simple structure.The structure includes a pressure plate mounting structure that is attached to the inner circumference of the brake housing to connect the sliding grooves. A groove is formed into the circumferential groove, into which the engaging protrusion on the outer periphery of the pressure plate is fitted through the sliding groove, and a locking member such as a pin or bolt that is inserted through the brake housing is inserted into the circumferential groove. It is characterized in that it is engaged with a pressure plate fitted into the circumferential groove to prevent its rotation.

Next, embodiments of this invention will be illustrated below with reference to the drawings.

Reference numeral 1 denotes a brake housing fixed to the transmission body, and the brake housing shown in FIGS. 1 to 3 is formed into a cup shape so as to ensure good sealing when the brake housing is fixed. Above brake housing 1
A sliding groove 11 for engaging a friction plate 8, which will be described later, is formed in the sliding groove 1.
A circumferential groove 12 is formed on the inner circumferential side connecting between 1 and 11.

Reference numeral 2 denotes a pressure plate, and on its outer periphery, an engagement protrusion 21 that can be inserted into the sliding groove 11 of the brake housing 1 is formed in correspondence with the sliding groove 11. In addition, in the case shown in FIGS. 1 to 3, two parts of the engaging protrusion 21 shown in FIGS.
In the case shown in FIG. 6, a fitting hole 22 for the locking member 3 is formed at one location on the outer periphery of the pressure plate 2. The pressure plate 2 is attached to the brake housing 1 by fitting its engagement protrusion 21 into the circumferential groove 12 of the brake housing 1 through the sliding groove 11, and the pressure plate 2 is inserted into the brake housing 1 and pressed. Insertion hole 2 of shear plate 2
Rotation is prevented by a locking member 3 formed by a spring pin or the like driven into 2. The engagement protrusion 21 described above is fitted into the circumferential groove 11 by the engagement protrusion 21.
1 into the inner periphery of the brake housing 1 while following the sliding groove 11, and when the pressure plate 2 is inserted to the circumferential groove 12 position, the pressure plate 2 can be rotated. Therefore, the pressure plate 2 can be attached to the brake housing 1 very easily.

Next, reference numeral 4 denotes a shaft-shaped cam pin, which is rotatably fitted into the brake housing 1, and has a semicircular notched cam portion 41 formed at its tip. Further, a brake operating lever 42 is integrally connected to the cam pin 4 by welding or the like.

5 is an actuator fitted into the brake housing 1, and in the embodiment shown in FIGS.
In the embodiment shown in FIGS. 4 to 6, the brake housing 1 is fitted into the inner peripheral portion of the brake housing 1 so as to be free to rotate and move in the axial direction. The actuator 5 has a protrusion 51 on its outer periphery that engages with the cam pin 4, and the cam pin 4 is activated by operating the lever 42.
The entire actuator can be rotated by rotating the actuator.

Further, on the opposing surfaces of the actuator 5 and the brake housing 1, diagonal grooves a and a' are formed with cross-sectional depths that gradually differ. The cam ball b is clamped so that the two parts abut against each other. Therefore, the actuator 5 is
When the entire body is rotated, the rescue cam mechanism moves it in the axial direction away from the facing surface of the housing 1.

6 is the brake shaft introduced into the housing 1, 61
is a brake hub that is fitted and fixed to the brake shaft 6, and a spline is formed on the outer periphery of the brake hub.

Reference numeral 7 denotes a disc plate 7, which is attached to the brake hub 6 with a spline 71 formed at its center so as to be movable in the axial direction, and rotates together with the brake shaft 6. Above disk plate 7
A friction fading material 72 is attached to both sides of the .

Reference numeral 8 designates a friction plate provided between the disc plates 7, 7, each of which has an outer circumferential protrusion 81 meshes with the sliding groove 11 of the brake housing 1 to prevent rotation, and is freely movable in the axial direction. It is provided. 9 in Fig. 1 is the brake shaft 6
This is a bearing fitted to the

Braking of the brake shaft 6 by the plate disc brake having the above structure is achieved by moving the disc plate 7 in the axial direction of the actuator 5 described above.
The friction plates 8 and 8 are pushed toward the pressure plate 2 side and pressed against each other, and braking is achieved by the frictional resistance caused by the pressure contact. During this braking, the engagement convex portion 21 of the pressure plate 2 is fitted into the circumferential groove 12 of the brake housing 1, so that the pressure plate 2 can firmly receive the pressing force from the actuator 5.

In addition, in the embodiment shown in FIGS. 1 to 3, the rotation prevention means of the pressure plate 2 is provided on the outer peripheral side of the brake housing 2, as in the embodiment shown in FIGS. 4 to 6. In some cases, the locking member 3 is driven in (see FIG. 7), and in other cases, a bolt is used as the locking member 3 and screwed in.

Further, the plate disc brake according to this invention is not limited to the brake having the structure shown in the drawings, but can be implemented with various known plate disc brakes.

This invention is constructed as described above, and a circumferential groove 12 connecting the sliding grooves 11 is formed on the inner circumference of the brake housing 1, and an engaging convex on the outer circumference of the pressure plate 2 is connected to the circumferential groove 12. The portion 21 is fitted into the sliding groove 11, and the pressure plate 2 is prevented from rotating by a locking member 3 such as a pin or bolt. The combined convex portion 21 is inserted into the sliding groove 11.
It can be fitted into the circumferential groove 12 by simply inserting it into the inner circumference of the brake housing while aligning it along the circumferential groove 12, and rotating it when it reaches the circumferential groove 12 position, making it very easy to attach it to the brake housing 1. This means that the pressure plate 2 can be attached much more efficiently than when the pressure plate 2 is bolted at several points on the outer periphery of the pressure plate 2.

Further, the manufacturing cost associated with the formation of the circumferential groove 12 connecting the sliding grooves 11, 11 is small, and the present invention is more cost-effective than the conventional method using a retaining ring for holes.

Moreover, the pressure plate 2 has a circumferential groove 12.
Since it is strongly prevented from coming out when it is inserted into the brake, it can exhibit sufficient durability against the pressing force of the actuator 5 when the brake is applied. Furthermore, since there is no need to form a threaded portion for a bolt on the end face of the brake housing as in the conventional bolt-fastening type, the wall thickness of the brake housing itself can be made thinner, resulting in further cost reduction.

Therefore, the pressure plate of the plate disc brake can be attached to the brake housing very easily, which can greatly contribute to cost reduction, and provides various excellent practical effects.

[Brief explanation of the drawing]

The figures illustrate an embodiment of this invention, and FIG. 1 is a sectional view, FIG. 2 is a side view, FIG. 3 is a perspective view of the main part, and FIG. 4 is a sectional view showing another embodiment. , FIG. 5 is a side view, FIG. 6 is a perspective view of the main part, and FIG. 7 is a sectional view of the main part showing a modification. 1... Brake housing, 11... Sliding groove,
12... Peripheral groove, 2... Pressure plate, 2
DESCRIPTION OF SYMBOLS 1... Engagement convex part, 3... Locking member, 4... Cam pin, 5... Actuator, 6... Brake shaft, 7... Disc plate, 8... Friction plate.

Claims (1)

[Scope of utility model registration request] A circumferential groove connecting the sliding grooves is formed on the inner circumference of the brake housing, and the engaging convex portion on the outer periphery of the pressure plate is fitted into this circumferential groove through the sliding groove, and the brake housing is inserted through the circumferential groove. Attachment of a pressure plate in a plate disc brake characterized in that a locking member such as a pin or bolt is engaged with the pressure plate fitted in the circumferential groove to prevent rotation thereof. structure.