JPS63130936A - Brake rod connector to lever arm for automatic slack adjuster - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a slack adjustment device for use in trucks or similar road transport vehicles. The invention more particularly relates to such a slack adjusting device and a device for connecting the lever arm or yoke of the slack adjusting device to a brake rod.

The first object of the invention is to present a coupling device of the above-mentioned type that is simple in construction and reliable in operation.

Another object of the present invention is to utilize a threaded bushing and a locking member capable of retaining the bushing in position once it has been properly positioned within the lever arm. It is to connect arms or yokes.

Other objects will become apparent from the description, drawings, and claims.

Hereinafter, preferred embodiments of the present invention will be described.

The present invention relates to slack adjustment devices for both manual and automatic types used today in trucks and similar road vehicles. Such an automatic slack adjustment device is disclosed in Japanese Patent Application Laid-Open No. 125424/1983, filed by the present applicant.

The invention particularly relates to the connection between the lever arm of the slack adjustment device and the brake rod. In such known connections, in order to adjust the position of the so-called lever arm or yoke, as those skilled in the art call it, on the brake rod, it is necessary to remove the pin connection between the yoke and the body of the slack adjuster. Yes, after removing the yoke,
Rotate the brake rod. The invention provides a subassembly for the connection in which a bushing is screwed onto the brake rod and the bushing is then positioned in the hole in the yoke. Once the bushing is correctly adjusted relative to the yoke and brake rod, a locking member is inserted, thus preventing further movement of the bushing relative to the yoke and locking the assembly together. The pin or locking member can be easily removed if further adjustment is required.

In the drawing, the shaft is designated by the reference numeral 10 and is the brake actuation shaft of a conventional brake system for road transport vehicles. Shaft 10 is known in the art as an S-shaped camshaft to describe the movement it produces during brake application. The drive member or worm gear 12 has a plurality of inwardly directed splines 14, is connected to the shaft 10, and is rotatably disposed within a schematically illustrated body 16. A side cover plate 18 is attached to the body, and seals can be inserted where it is necessary to protect the interior of the body.

At the opposite end of the body 16 is a yoke or lever arm 20.
is rotatably mounted, and the yoke or lever arm 20 is journalled relative to the main body and connected to a brake rod 22. The yoke is pivotally connected to a link 24 which forms part of a slack adjustment device, generally indicated at 26. The type of slack adjustment device is disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 60-1254.
There may also be other types constructed for the same purpose, such as those disclosed in No. 24.

The present invention is independent of the particular device used to effect the slack adjustment and whether the adjustment device is automatic or manual.

Referring to the yoke 20 as shown in FIG. 3, a hole or cylindrical chamber 28 is formed in the yoke 20 and a bushing 30 is disposed within the cylindrical chamber. The bushing 30 has an internally threaded surface 32 which receives the threaded end of the brake rod 22 and thus provides a connection between the brake rod and the yoke. The bushing has a tangential groove 34
The groove 34 has a cylindrical outer surface with a cylindrical outer surface formed therein, and the groove 34 is located opposite a mating groove 36 formed through the inner surface of the hole 28, as shown in FIG. Groove 36 is
It forms part of a transverse opening or hole 37 in which a pin 38 is received.

The groove 34 in the outer surface of the bushing 30 in combination with the hole 37 allows the pin 38 to be positioned when the bushing is positioned within the chamber and the grooves are aligned.
It becomes a slotted opening to receive the water. Pin 38 is used as a locking member to tighten the bushing within hole 28. Bushing 30 before the pin is inserted
can be turned over the threaded end of the brake rod 22 to provide connection and appropriate adjustment between the brake rod and the yoke. Once the connection is made,
The bushing and yoke are aligned and the pin 38 is inserted.

The pin 38 has a head 40 which is carried on one side of the yoke when the pin is inserted and a split pin or the like 42 is used to tighten the pin to the yoke.

Hole 28 has a support shoulder 44 at its inner end, as shown in FIG. 3, to support bushing 30 in what is referred to as the high pressure direction.

The shoulder therefore prevents the bushing from being forced out of the yoke when pressure is applied during braking. Pin 38 prevents the bushing from becoming dislodged from the yoke in the low pressure direction. The pin 38 supports the load in the low pressure direction and the shoulder 44 prevents the bushing from being forced out of the yoke in the high pressure direction.

There are various means of locking the bushing within the yoke. In the device as shown, the outside of the bushing is cylindrical and the pin extends through a flange on the outside of the bushing. In other embodiments, the bushing exterior may be non-cylindrical, for example rectangular, hexagonal, etc. If you do that, there is no need for miso on the outside of the bushing.

This is because the pin extends through the yoke and faces onto the flat side of the bushing, thereby preventing rotation of the bushing once the pin is inserted.

The present invention provides a means for quickly assembling a slack adjustment device to the brake rod 22. Not only is assembly quick, adjustment of the relative position of these two elements is as simple as removing the pin, turning the bushing, and reinserting the pin.

Although the preferred embodiments of the present invention have been illustrated and described in detail above, the present invention is not limited thereto, and can be modified in many ways.
Of course, changes may be made.

[Brief explanation of the drawing]

FIG. 1 is a side view of a slack adjustment device according to an embodiment of the present invention. FIG. 2 is an end view of a lever arm of the slack adjustment device with a bushing therein. FIG. 3 is a lever of the slack adjustment device. FIG. 4 is a side view showing a part of the arm or yoke as a cross section; FIG. 4 is an end view showing a part of the bushing as a cross section;
FIG. 5 is a side view of the bushing. [Explanation of symbols of main parts] Brake operating axis・・・・・・・・・・・・・・・・・・
10 Main body・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・16 Drive member・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・12 Lever arm (yoke)・・・20 Bushing・・・・
・・・・・・・・・・・・・・・・・・3゜pin・
・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・38 brake rod・・・・・・・・・
・・・・・・・・・22 Applicant: Sloan Vhruv Company 5.2. Ri3.

Claims (1)

[Scope of Claims] 1. A main body provided between a brake chamber and a brake actuation shaft, a drive member movable with respect to the main body and positioned on the brake actuation axis by the main body, and a drive member pivoted to the main body. A slack adjustment device for a vehicle brake, comprising a supported lever arm and adjustable coupling means between said lever arm and a drive member for adjusting the relationship between said drive member and a body. The means for connecting the brake rod to the lever arm includes a bushing rotatably mounted on the brake rod and rotatably disposed within the lever arm, and a bushing for preventing rotation of the bushing relative to the lever arm. and a removable locking means inserted into said lever arm as shown in FIG. 2. The device according to claim 1, further comprising a hole in the lever arm, the bushing being disposed within the hole, and the removable locking means being able to lock the lever arm from outside the lever arm. A device characterized in that it is a pin extending into the hole. 3. The device according to claim 2, characterized in that it has a pair of grooves on the outside of the bushing and in the hole, and the pin is located in the pair of grooves. . 4. The apparatus of claim 3, wherein the bushing has a cylindrical outer surface and the pin prevents rotation of the bushing within the bore. 5. The device according to claim 2, wherein a reinforcing shoulder is provided at one end of the hole to support the bushing, and the pin prevents the bushing from coming out of the lever arm in one direction. and wherein the shoulder supports the bushing within the lever arm to prevent withdrawal of the bushing in the opposite direction.