JPH04236827A - Drum brake device of vehicle - Google Patents

Abstract

PURPOSE:To improve working ability and assembly performance in an assembly line by providing a guide mychanism for guiding' a cable head from a cable inserting hole, and brake shoe operating lever insertion hole to the cable locking section of an operation lever. CONSTITUTION:In order to insert a parking brake cable 10 after securing a brake drum 1 to an axle hub 20, first of all, a cable head 10A is made to pass through the insertion hole 3A of a back plate 3 and guided by a pipe-like guide and is bade to abut on the slant flange 5A of the J letter-like-groove of a brake shoe operating lever 5. In the next step, when the cable 10 is pushed in, the cable head 10A slides along the slant flange 5A and moves as shown by a chain line arrow mark and goes over a hook-like projection 5B. At the same time, the locking member 15 of an outer case passes through the intertion hole 3A and enters the inside of the back plate 3. At this time this is directly pushed in by hands or through the projection in the radial direction provided on the cable 10 beforehand.

Description

[Detailed description of the invention]

0001

0001

0002

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drum brake device for a vehicle, which includes a cable guide mechanism for inserting and locking a parking brake cable after a brake drum is assembled to a suspension.

0003

0002

0004

[Prior Art and Problems] Conventionally, the parking brake cable that operates the parking brake is inserted into the drum brake device through the insertion hole of the back plate before the brake drum is attached to the axle hub, and the cable is used to expand the brake shoes. The worker used his hands to reach the cable locking part of the operating lever and lock it.

[0005]

However, the parking brake cable is tied to both wheels (mainly the rear wheels) of a vehicle such as an automobile, and is slidably grasped with a hook in the center to balance the tension on both the left and right wheels. Some models have a structure in which when the parking brake lever is pulled, the front cable connected in series to the hook is pulled toward the parking brake lever side. It is unavoidable that the plates are connected by a single parking brake cable, which poses a problem in that it impairs work efficiency in a vehicle assembly factory.

[0006]

[0004] Furthermore, at present, there is a problem in that the parking brake cable cannot be connected after the completed drum brake devices for both the left and right wheels are assembled as an assembly and separately assembled to the suspension.

[0007]

This is because the axial direction of the cable insertion hole in the back plate is always drilled with an axle-direction component, and the cable is bent by the axle-direction component when the cable is inserted from the brake shoe operating lever to the parking brake on the driver's side. Because the cable is pulled by a lever, it is extremely difficult for an operator to insert the cable through the insertion hole and lock the cable head to the brake shoe operating lever when the brake drum is attached. 7 and 8, which are a vertical sectional view and a partial side view of the conventional example, and their B
(See FIG. 9, which is a cross-sectional view of -B).

[0008]

[0006] This fact can be seen, for example, in Utility Model Application Publication No. 58-15372.
As can be seen from the prior art disclosed in "Cable Guide Device for Drum Brakes," the "cable guide device" itself is not a guide device for inserting the cable, but rather ensures and facilitates the operation of the cable after the cable is installed. It is clear that this is merely a device for creating friction, and it was never intended to be used to insert and install a cable after the brake drum is installed, as in the present invention, which will be described later. This is also evident from the presence of a coil spring (return spring) 17 attached to the outside of the cable.

[0009]

The inventors of the present invention have discovered that if the parking brake cable can be inserted and installed from the back plate side after the brake drum is installed, the workability in the assembly factory can be significantly improved, and they have arrived at the present invention.

0010

[0008]

[0011]

OBJECTS OF THE INVENTION An object of the present invention is to enable insertion and installation of a parking brake cable from the back plate side after the brake drum is installed.

0012

Another object of the present invention is to improve workability and ease of assembly during manual or automatic assembly on an assembly line by allowing cables to be placed after the drum brake is assembled into a vehicle. It's about trying.

[0013]

0010

[0014]

[Structure of the Invention] According to the present invention, in a drum brake device for a vehicle equipped with a parking brake cable guide mechanism for expanding brake shoes, a cable insertion hole is formed in a back plate, and a cable insertion hole is provided corresponding to the insertion hole. The brake shoe actuating lever includes a brake shoe operating lever having a cable locking portion at the tip that swings toward and away from the insertion hole, and a guide mechanism that guides the cable head from the insertion hole to the cable locking portion of the actuation lever. A drum brake device for a vehicle is provided.

[0015]

The present invention will be explained in detail below using Examples.

[0016]

[0013]

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a plan sectional view of an embodiment of the present invention. In FIG. 1, 1 is a brake drum, 2 is a brake shoe, 3 is a back plate, 5 is a brake shoe operating lever, 10 is a parking brake cable, 10A is a cable head, 13 is a tubular guide, 14 is an outer case of the cable, 15 is a locking member for fixing the cable outer case 14 to the back plate 3. As in the conventional example, the brake drum 1 is connected to the axle hub 2 as shown in FIG.
It is removably attached to 0. The tip of the brake shoe actuating lever 5 has a J-shaped groove when viewed from the front and back direction of the vehicle, allowing the cable 10 to be inserted horizontally.

[0018]

FIGS. 2, 3, 4, and 5 are perspective views taken along line AA in FIG. 1, showing the operation of the embodiment of the present invention. FIG. 6 is a view taken along the line B--B in FIG. 5.

[0019]

The process of inserting and mounting the parking brake cable 10 after mounting the brake drum 1 on the axle hub 20 will be described below.

[0020]

First, in FIG. 2, the cable head 10A is passed through the insertion hole 3A of the back plate, and guided by the tubular guide 13 (not shown in FIGS. 2, 3, 4, and 5), the cable head 10A is inserted into the brake shoe. J of operating lever 5
It is brought into contact with the inclined flange 5A of the groove. Next, when the cable 10 is pushed in as shown in FIG. 3, the cable head 10A slides along the inclined flange 5A, moves as indicated by the chain arrow, and passes over the hook-shaped protrusion 5B. At the same time, the locking member 15 of the outer case 14 passes through the insertion hole 3A (this can be pushed in directly by hand or through a radial protrusion provided in advance on the cable 10) and enters the inside of the back plate 3. .

[0021]

Next, in FIG. 4, move the cable 1 in the direction of the arrow.
By pulling back 0, the cable head seats on the cable locking portion 5C of the brake shoe operating lever as shown in FIG.

[0022]

[0017] The seated state is shown in the BB arrow view. That is, the cable head 10A is located below the hook-like protrusion 5B. Therefore, after the cable head is seated, it will never come off as long as tension is applied to the cable 10.

[0023]

Note that the tubular guide 13 in FIG. 1 can be omitted if the positional relationship between the insertion hole 3A, the operating lever 5, and the brake drum 1 is made appropriate.

[0024]

Similarly, the J-groove inclined flange 5A of the actuating lever 5, which is another guide, can be omitted if the relationship with the position of the tubular guide 13 is made appropriate and the horizontal flexure of the cable 10 is used effectively. I can do it.

[0025]

That is, the cable guide mechanism of the present invention can be a tubular guide fixed to and extending inwardly to the J-groove with an inclined flange and/or the insertion hole of the brake shoe operating lever.

[0026]

In addition, a small check window may be provided in the back plate 3 so that the correct seating state of the cable head 10A can be visually confirmed. In this case, the check window is usually covered with a rubber cover to prevent muddy water and dirt from entering.

[0027]

[0022]

[0028]

【Effect of the invention】

[0029]

All of the above objectives are achieved by implementing the present invention.

That is, after the brake drum is installed, the parking brake cable can be inserted and installed from the back plate side. Therefore, it is possible to improve the workability and assemblability of the assembly line.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional plan view of an embodiment.

FIG. 2 is an action explanatory diagram that is a view taken along the line A-A in FIG. 1;

FIG. 3 is an action explanatory diagram that is a view taken along the line A-A in FIG. 1;

FIG. 4 is an action explanatory diagram that is a view taken along the line A-A in FIG. 1;

FIG. 5 is an action explanatory view taken along the line A-A in FIG. 1;

FIG. 6 is a view taken along the line B-B in FIG. 5;

FIG. 7 is a cross-sectional view of a conventional drum brake viewed from the vehicle front and back direction.

FIG. 8 is a sectional view of the lower half of a conventional drum brake viewed from the axial direction.

FIG. 9 is a sectional view taken along line CC in FIG. 8;

[Explanation of symbols]

1 Brake drum 2 Brake shoe 3 Back plate 3A Insertion hole 5 Brake shoe operating lever 5A
Inclined flange 5B Hook-shaped protrusion 5C Cable locking portion 10 Parking brake cable 10A Cable head

Claims (2)

[Claims] Claim 1: A drum brake device for a vehicle equipped with a parking brake cable guide mechanism for expanding brake shoes, including a cable insertion hole drilled in a back plate, and a cable insertion hole provided corresponding to the insertion hole and close to the insertion hole. A vehicle comprising: a brake shoe operating lever having a cable locking portion at the tip that swings apart; and a guide mechanism guiding the cable head from the insertion hole to the cable locking portion of the operating lever. drum brake device. 2. The drum brake device according to claim 1, wherein the cable guide mechanism is a tubular guide fixed to a J-shaped groove with an inclined flange and/or an insertion hole at the tip of the brake shoe operating lever and extending inward.