JPS6219476Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a mounting structure for a spring chamber of a vehicle brake.

2. Description of the Related Art Conventionally, for example, in a combined air/oil type brake, a system is known in which a spring chamber is used as a parking brake for a rear wheel.

This spring chamber is supported by a bracket on the rear axle case, and by connecting it to a wedge device provided on the wheel cylinder, a parking brake or an emergency brake can be applied. In this example, service braking is performed by oil.

The end of the brake chamber is usually provided with an axial stud, which is inserted into a hole in a bracket of the axle case and fixed by tightening.

The brake chamber is attached to the bracket so as to be located between the spring seat part of the axle case and the differential carrier, but this bracket must be installed to avoid the proximity of the spring seat and interference with frame movement at maximum load. The mounting position to the axle case is almost regulated based on the following two points. On the other hand, as mentioned above, the known spring chamber is constructed so that the mounting stud protrudes from one end thereof, so when it is installed, the spring chamber protrudes a large amount from the bracket toward the differential carrier. In the case of a structure in which the amount of protrusion is large), the problem arises that it cannot be assembled. In order to solve this problem, it may be possible to change the shape of the bracket, but the structure would be too large to be practically adopted, and the weight and cost would increase significantly.
This is extremely irrational.

One object of the present invention is to eliminate the above-mentioned drawbacks, and another object is to provide a spring chamber mounting bracket that can prevent damage to the spring chamber and ensure safety. It is.

The present invention will be explained below with reference to the drawings. In FIGS. 1 and 2, reference numeral 1 indicates a rear axle case of a truck, and reference numeral 2 indicates a bracket, which is fixed to the axle case 1. As shown in FIG. A differential carrier 10 is attached to the front of the bungee yaw portion of the axle case 1, and a cover 11 is attached to the rear end.
A spring seat 1 is installed between the wheels 4 and 4, which will be described later.
2 is fixed. 3 is a spring chamber fixed to the same bracket 2, 4 is a wheel, 5
is a brake drum, and 6 is a wheel cylinder fixed to the back plate.

A known wedge device (not shown) is provided within the wheel cylinder 6, and the wedge device and the spring chamber 3 are connected to each other by rods projecting from each. FIG. 3 shows the structure of the connection between both rods. The rod 30 end on the spring chamber 3 side is U-shaped,
The ends of the rods on the wedge device side have a rectangular shape that is inserted into this U-shaped gap, and are pin-coupled to each other.

As shown in FIGS. 4 and 5, a mounting flange 32 is fixed to the case 31 of the spring chamber 3 over its entire circumference. The mounting flange 32 is perpendicular to the axial direction of the chamber 3, has two mounting holes 33 and 34, and is located closer to the rod 30 of the chamber 3. Since the other parts are well known, the explanation of the structure will be omitted.

As shown in FIGS. 6 to 8, the bracket 2 is
Base 20 for attaching spring chamber 3
Attachment parts 21 and 22 to the protector/rear axle case 1 are bent into a substantially U shape from both ends of the base 20, and from the other end of the base 20, the attachment parts 21 and 22 stand upright in the opposite direction to the attachment part 21. The other attachment part 23 is folded and bent.
and reinforcing plates 24 and 25 that communicate between both ends of the mounting portion 23 and the base 20, respectively.

A hole 20a is formed in the base 20, into which a portion of the spring chamber 3 is inserted and bolted to the base 20 at its mounting flange 32. After fixing the spring chamber 3 in advance as described above, the bracket 2 is assembled by attaching the mounting portion 23 to the front vertical portion of the axle case 1, and attaching the mounting portion 21 to the front vertical portion of the axle case 1.
22 to the upper and lower parts of the axle case 1, respectively, through the mounting plates 13, 14, and 15 (hidden and not visible in the figure).
It is almost U-shaped. At the same time, the rod end of the wedging device is pin-coupled to the rod 30 end of the spring chamber 3 (spring chamber 3
(Connection work is carried out while adjusting the length by supplying compressed air into the room).

When air is not supplied to the spring chamber 3, the rod 30 is pulled to the right in Fig. 1 by the force of the spring, the wedge device is activated, and the brake is applied to the wheel 4 (parking or in case of emergency). During normal running, air is constantly supplied and the rod 30 is kept pushed in the opposite direction, so the wedge device is inactive and the brake does not work. In this state, the brake is applied to the wheel 4 only when a service brake hydraulic pressure is applied to the wheel cylinder 6.

As shown in Fig. 4, a conventional stud bolt is protruded from one end of the spring chamber 3 (the two-dot chain line in the figure indicates the stud bolt).
protrudes from the base 20 of the bracket 2 toward the differential carrier 10 by a distance A in the installed state, but according to the present invention, it becomes a distance B from the mounting flange 32, and it protrudes in the same direction by A-B. The amount of protrusion decreases. For this reason, in the conventional device described above, the end of the spring chamber 3 came to the position shown by the two-dot chain line in FIG. It is resolved as follows.

Also, the upper and lower mounting parts 21, 2 of the bracket 2
Since spring 2 is configured to cover the upper and lower sides of the spring chamber 3, it also has the function of protecting the spring chamber 3 from obstacles such as stones when the vehicle is running. Note that if this base 20 is extended vertically as shown by the two-dot chain line in Fig. 2, then bent at right angles and fixed (welded) near the top of the bungee yaw portion of the axle case 1, the above-mentioned protective effect will be even greater. Become. In this case, the attachment part 2
1 and 22 become unnecessary. Further, it is desirable to remove the attachment portion 23 and weld the reinforcing plates 24, 25 directly to the vertical wall in front of the axle case.

The effects of the present invention are as follows.

(1) Regarding the spring chamber, instead of end face stud bolts, a mounting flange is provided on the circumferential part inward from the end face, so it is possible to reduce the amount of protrusion from the bracket toward the differential carrier, and it is possible to reduce the amount of protrusion around the rear axle. can freely respond to changes in the layout.

Furthermore, since the present invention can be carried out without changing the conventional apparatus, cost and weight can be significantly reduced compared to the case where the bracket mentioned at the beginning is changed.

(2) Regarding the bracket, the part that attaches to the axle case also has the function of protecting the spring chamber, so it is extremely useful from a safety standpoint. Particularly in the case of a small axle case, if the structure is as shown by the two-dot chain line in FIG. 2, the bracket can be assembled to the axle case in advance, which is advantageous in terms of production.

[Brief explanation of the drawing]

Fig. 1 is a schematic top view of the main parts of a rear axle equipped with an embodiment of the present invention, Fig. 2 is a schematic perspective view of Fig. 1 viewed from the direction of the arrow, and Fig. 3 is an exploded view of the parts shown in Fig. 1. FIG. 4 is a partially cutaway side view showing an embodiment of the spring chamber of the present invention, FIG. 5 is a side view of FIG. 4 viewed from the right, and FIG. 6 is a side view of the spring chamber of the present invention. 7 is a side view of FIG. 6 viewed from the left, and FIG. 8 is a top view of FIG. 7 viewed from above. Code 1...Rear axle case, 2...Mounting bracket, 3...Spring chamber, 6
...Wheel cylinder.

Claims (1)

[Claims for Utility Model Registration] 1. A spring chamber is attached to a bracket fixed to a rear axle case, and the spring chamber and a wedge device of a wheel cylinder are connected via a rod, wherein the base of the bracket is A hole into which a part of the spring chamber can be inserted is formed, and a mounting flange is fixed to the outer circumference of the spring chamber, and the flange is inserted into the bracket hole with a part of the spring chamber protruding from the bracket hole. A mounting structure for a spring chamber of a vehicle brake, characterized in that the spring chamber is configured to be fixed to a base. 2. The spring for a vehicle brake according to claim 1, wherein the bracket is formed with a mounting portion that covers at least a portion of the upper and lower parts of the spring chamber. Chamber mounting structure.