JP2515160Y2 - Drum brake anchor - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an anchor of a drum brake.

[Conventional technology]

As an anchor of a conventional drum brake, for example, there is one disclosed in Japanese Utility Model Laid-Open No. 59-163237. The anchor includes an anchor body with which the webs of the pair of brake shoes come into contact, an ear portion that is formed so as to project on both sides of one end side of the anchor body, and that holds the side surfaces of the webs of the pair of brake shoes, and the anchor. A leg portion which is upright on the other end surface of the main body, is inserted into the backing plate, and is fixed by caulking is integrally formed.

[Problems to be solved by the device]

However, the above-described conventional drum brake anchor generally requires many steps for manufacturing. That is, using a pressing device, a first step of punching a flat plate that matches the outer shape of the anchor, a second step of punching the flat plate to form a foot portion, and a second step of forming both ears by upsetting. It consists of 3 steps. Also, when this anchor is manufactured by die forging, two steps are required after the first step of punching the flat plate, and similarly, there are three steps.

As an anchor of this kind in which the anchor body and the foot are integrally formed, there is one disclosed in Japanese Utility Model Laid-Open No. 61-96024. However, for this anchor,
Since it is constructed by combining two blocks in which a leg having a circular cross section is formed on a prismatic body, it has a complicated shape, and in particular, the number of steps is required to process the leg, which makes manufacturing difficult. in addition,
When the columnar foot is crushed for attachment to the backing plate, it bulges and deforms while maintaining a circular cross section, so the foot after deformation almost contacts the circular hole of the backing plate. Without it, it is impossible to reliably prevent rattling.

[Means for solving the problem]

The present invention has been made in view of such a conventional problem, and the structure thereof is such that the anchor main body portion with which the webs of the pair of brake shoes come into contact with each other, and the anchor main body portion protrudes on both sides at one end side, A foot that is upright on the other end of the anchor body and has a rectangular cross section, is inserted into the rectangular hole of the backing plate, and is fixed by crushing. The anchor of the drum brake is characterized in that the part and the part are integrally formed and are made of a flat metal plate having a uniform thickness.

[Action]

Then, the anchor uses a press machine to punch a relatively thick metal flat plate in the thickness direction so that the anchor body, ears, and feet are formed simultaneously in one step, and a uniform thickness is obtained. Have As described above, since the anchor is formed by punching a metal flat plate in the plate thickness direction in one step, the foot has a rectangular cross section.

The anchor having such a structure is fixed to the backing plate by inserting the foot into the rectangular hole of the backing plate of the drum brake, crushing the tip of the foot. At the time of this crushing, the base end side of the foot portion is also expanded and expanded, and the foot portion is fitted into the hole of the backing plate without any gap.

Then, a pair of brake shoe webs are respectively brought into contact with both side surfaces of the anchor body to support each brake shoe on the anchor. The movement of each brake shoe is
The brake shoes are regulated by the ears of the anchor and the backing plate, and each brake shoe is supported while being held in a predetermined position by the anchor.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 to 3 show one embodiment of this invention. In the figure, reference numeral 1 indicates an anchor, and the anchor 1 includes an anchor body 1a and curved surfaces 1e, 1 on both sides of one end of the anchor body 1a.
A pair of legs 1d that stand upright via a curved surface are integrally formed on the other ends of the ears 1b, 1c protruding through f and the anchor body 1a.

The anchor 1 is manufactured as follows. That is, using a press machine, a metal flat plate having a relatively thick plate thickness S is punched in the plate thickness L direction (direction of arrow A shown in FIG. 1),
The anchor body 1a, the ears 1b, 1c and the foot 1d are simultaneously formed in one fine blanking step. And ear
1b and 1c are formed on the anchor body 1a so as to project through the curved surfaces 1e and 1f so as to have a semicircular cross section, and the foot portion 1d is erected on the other end side of the anchor body 1a via the curved surface. The tip of the portion 1d has a semicircular cross section. In addition, the anchor 1 has a uniform thickness by forming a flat surface on both the front and back surfaces as a result of punching a metal flat plate in the plate thickness L direction (arrow A direction),
The foot 1d has a rectangular cross section.

In the anchor 1 having such a structure, the foot portions 1d are respectively inserted into the pair of rectangular holes 2a of the backing plate 2 of the drum brake, and the tip portions of the foot portions 1d are caulked as shown in FIG. It is crushed and fixed to the backing plate 2. If the hole 2a of the backing plate 2 is formed in a rectangular shape having a size capable of accommodating a wide base end portion of the foot portion 1d, the tip end portion of the foot portion 1d is expanded and prevented from coming off during crushing. At the same time, the entire foot portion 1d expands, and the foot portion 1d is fitted into the hole 2a of the backing plate 2 without any gap, so that the anchor 1 is attached to the backing plate 2 without rattling.

Then, the end faces of the webs of the pair of brake shoes 3 and 4 are brought into contact with both side surfaces of the anchor body 1a so that the brake shoes 3 and 4 are supported by the anchor 1. Each brake shoe
The vertical movement of 3, 4 in FIG. 2 is restricted by the ears 1b, 1c of the anchor 1 and the backing plate 2,
The brake shoes 3 and 4 are supported by holding a predetermined position with respect to the anchor 1. At the time of supporting the brake shoes 3 and 4 by the anchor 1, the ears 1b and 1c are formed on the anchor body 1a so as to have a semicircular cross section through the curved surfaces 1e and 1f, respectively. Each brake shoe 3,4
As shown in detail in FIG. 3, the curved surfaces 1e and 1f are locked by linear contact, and do not contact with a wide surface. As a result, it is possible to reduce the transmission of the vibrations of the brake shoes 3 and 4 due to the braking to the anchor 1 and then to the backing plate 2, and it is possible to well suppress the brake noise such as chattering noise on the backing plate 2. To be done.

By the way, in this embodiment, a pair of legs 1d are formed, but since the legs 1d have a rectangular cross section, only one is formed, and one of the rectangles of the backing plate 2 is formed. It can be mounted in the hole such that it cannot rotate relative to the hole.

[Effect of device]

As can be understood from the above description, according to this invention, the following effects can be obtained.

(1) Since the anchor has a uniform thickness, it can be manufactured in one step using, for example, a pressing device, and its manufacturing is extremely easy.

(2) Since the ears are firmly formed in the anchor body by punching, for example, the durability of the anchor integrally formed with the ears is improved.

(3) The foot is formed relatively thick so as to necessarily have a rectangular cross section, for example, by punching, and even if a single foot is used, the anchor is accurately oriented in a predetermined direction. It is possible to obtain the practical effect that it is engaged with the king plate in a non-rotatable manner and has excellent durability. In addition, the foot having a rectangular cross-section has a long contact length with the tool in the diagonal direction of the rectangle when it is crushed, and thus it is difficult to stretch due to a large frictional resistance, but the central part of each side of the rectangle is Since the frictional force between them is small, they tend to bulge significantly. Therefore, even when an unskilled worker causes a caulking defect, a portion that locally hits the rectangular hole of the backing plate early is generated and firmly attached. As a result, it is possible to favorably prevent rattling of the foot in the attached state.

[Brief description of drawings]

FIGS. 1 and 2 show an embodiment of the present invention, FIG. 1 is a perspective view showing an anchor, FIG. 2 is a sectional view showing an attachment state of the anchor, and FIG. 3 is an ear portion of a web of a brake shoe. It is a figure which expands and shows the contact state with. 1: Anchor, a: anchor body, 1b, 1c: ear, 1d: foot,
1e, 1f: curved surface, 2: backing plate, 2a: hole, 3, 4: brake shoe.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Mitsuo Takahashi 1190 Shikamuro, Iwatsuki City, Saitama Prefecture, Akebono Brake Industry Co., Ltd. (Iwatsuki Factory) (56) References: 61-96024, JP

Claims (1)

(57) [Scope of utility model registration request] 1. An anchor main body portion with which a pair of brake shoe webs come into contact, an ear portion projecting to both sides of one end side of the anchor main body portion, with which the pair of brake shoe webs are locked, and an anchor main body portion. Being upright on the other end, having a rectangular cross section, and integrally formed with a foot that is inserted into the rectangular hole of the backing plate and fixed by crushing, and is made of a flat metal plate of uniform thickness. Anchor of the drum brake characterized by.