JPS6092111A - Brake apparatus for car - Google Patents

Abstract

PURPOSE:To improve assembly performance and reduce the number of necessary parts by allowing a back plate integrally fitted onto a front-wheel shaft to be engaged with the articles other than the front-wheel shaft, in a brake apparatus in which drum brakes are installed onto two operating front wheels. CONSTITUTION:A back plate 28 is fitted onto the root of a front-wheel shaft 22, and positioning is performed by tightening said back plate 28 by a nut 38 at the edge part of the front-wheel shaft 22 through the inner laces of the bearings 32 and 34 of a brake drum 30 and a collar 36, etc. The convex part formed onto a knuckle arm which is not shown in the figure and fixed onto a knuckle 20 is engaged with the concaved part which is not shown in the figure and formed onto the back plate 28, and the brake repulsive force applied onto the back plate 28 on brake application is transmitted to the knuckle 20 side. With such constitution, the freedom in designing alignment in case of a front wheel having a small diameter is increased and assembly performance can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a braking device for a vehicle in which two front steering wheels are each equipped with a drum brake.

(Prior art) When installing a drum brake on each front wheel of a three- or four-wheeled vehicle having two steering front wheels, conventionally, a flange extending in the radial direction is formed integrally with the front wheel axle, and a back plate is used to hold the whole. I was trying to fasten the plate with bolts. The bolts that secure this back plate are placed parallel to the front wheel axis. For this reason, there was a problem in that the kingpin position was far away from the front wheel center plane that was perpendicular to the front wheel axis.

Particularly in small vehicles that use small-diameter front wheels, if the kingpin extends far from the center plane of the front wheel, there will be an offset between the extension 1 of the kingpin axis and the tire grounding point (kingpin offset).
becomes larger, resulting in disadvantages such as increased steering force and increased design restrictions on front wheel alignment.

(Object of the Invention) The present invention has been made in view of the above circumstances, and is designed to bring the king pin and back plate closer together.

This makes it possible to increase the degree of freedom in designing front wheel alignment even when using a small diameter front wheel.

It is an object of the present invention to provide a brake device for a vehicle that is easy to assemble and is also suitable for reducing the number of parts.

In order to achieve this object, the present invention provides a vehicle in which drum brakes 2 are installed on each of the two front steering wheels, and the back plate of the drum brake is fitted onto the front wheel axle for positioning. In addition, the back plate is configured to engage with a member other than the front wheel axle that is integral with the front wheel axle to receive a brake reaction force. The present invention will be described in detail below based on the illustrated embodiments.

(Example) Fig. 1 is a perspective view of a small four-wheeled vehicle for traveling on rough terrain which is an embodiment of the present invention, Fig. 2 is an elevational cross-sectional view of the support portion of the front wheel 10, and Fig.
Figure 1 is a cross-sectional view along the line ■-■ showing the back plate, and Figure 4 is
The figure is a partially sectional plan view of the main parts.

The two steering front wheels 10.10 and the two driving rear wheels 12 (only one shown) are fitted with wide, ultra-low pressure tires.

King pin brackets 16, which are substantially U-shaped when viewed from the front, are fixed to both ends of a front axle 14 that connects the front wheels 10, 10, and a knuckle 20 is held here by a king pin 18 so as to be rotatable left and right. A front wheel axle 22 is integrally fixed substantially horizontally to this knuck/l'20.
A known drum brake 24 is attached to the holder.

This drum brake 24 includes a back plate 28 that supports brake shoes 26 and a brake drum 30. The back plate 28 is fitted onto the root side of the front wheel axle 22, and is tightened by a nut 38 at a portion 7J of the front wheel axle 22 via the inner race and collar 36 of the bearings 32, 34 of the brake drum 3o. This binding back plate 28 is positioned on the root side of the front wheel axle 22. A brake lever 42 that passes between the knuckle 20 and the back plate 28 is fixed to the camshaft 4o of the brake 24 as shown in FIG. It extends upward from near the top end (Figure 2). Therefore, when the front wheels 10 are steered, the brake wire 44 swings little.

A flange 46 is integrally formed on the brake drum 3o, and a split wheel 48 is attached to the flange 46 with bolts 50.
is fixed. As described above, wide ultra-low pressure tires are mounted on this wheel 48.

As shown in FIGS. 3 and 4, the back plate 28 has four radially long portions 52 integrally molded therein.

In FIG. 4, 54 is a knuckle arm, which is attached to the knuckle 2.
It is integrally fixed at 0. This knuckle arm 54
A radially long convex portion 56 is integrally formed on the outer edge of the back plate 28, and this convex portion 56 engages with the four portions 52 of the back plate 28. Due to the engagement between the recess 52 and the protrusion 56, the brake reaction force applied to the back plate 28 during braking is transmitted to the knuckle 20 side.

In FIG. 1, 58 is a bar handle, and 60 is a steering shaft.The rotation of this steering shaft 60 is transmitted to the knuckle arm 54 via a pitman arm and tie rod (not shown) fixed to the lower end of the steering shaft, and is transmitted to the front wheel. Rotate 10 left and right.

In addition, as shown in FIG. 4, the knuckle arm 541T1r
h! 1111!5Q1. -) #m1AMkTi-4-r
b+IrM-7T) Tool-1-Abuts against the inner surface 16a of the kingpin bracket 16 during steering, and functions as a steering stopper.

In Figure 1, 64.66 are the front and rear fenders, 68 is the engine, 70 is the fuel tank, and 72 is the driver's seat.

Further, 74 is a front brake lever attached to the right side of the handle 58.

If the brake lever 74 is now squeezed, the brake lever 42 is pulled via the wire 44, the camshaft 4° rotates, and the shoe 26 is pressed against the inner surface of the drum 30. Therefore, a braking force is generated at the front wheels 10. At this time, the brake reaction force acting on the back plate 28 is transmitted to the knuckle arm 54° knuckle 20 by the concave and convex portions 52 and 56.

In this way, the back plate 28 is concave and convex! This is because it engages with the knuckle arm 54 at an angle of 52°56.

There is no need to use bolts and nuts to fix the back plate to the front wheel axle side flange as in conventional devices, and the distance between the knuckle 20 and the back plate 28 can be reduced. Since the 8r allows Azusa Chika Sazeruko 2 to be used, the king pin offset does not become excessive even with a small diameter front wheel, increasing the degree of freedom in front wheel alignment design.

5 and 6 are a partially sectional front view of the second embodiment and its V
I-VI K'fi = sectional view, and in this embodiment, a pair of protrusions 80 (80a, 80b) that sandwich the knuckle 20 from the front and back are provided on the back plate 28A, so that the brake reaction force is directly transmitted to the knuckle 20. I made it.

FIG. 7 is a perspective view of the third embodiment, in which the knuckle 20B is attached to the front axle 14B, and the kingpin bracket 1 is attached to the front axle 14B.
6B is fixed to the front wheel axle 22 side, and a pair of convex portions 82 (only one shown) that sandwich the platen 16B from the front and rear are integrally formed on the back plate 28B of the brake 24B.

In each of the above embodiments, the back plates 28, 28A.

28B, four parts 52. Convex portions 80 and 82 are provided, and these 4 degrees are connected directly to the front wheel axle 22 and other members other than the front wheel axle (knuckle arm 54, knuckle 20, king bin platen).
16B), but the present invention is not limited to this, and both may be indirectly engaged via other members such as links or bolts to receive the brake reaction force.

(Effects of the Invention) In the present invention, while the back plate is positioned on the front wheel axle as described above, the brake reaction force is received by a member other than the front wheel axle that is integral with the front wheel axle.

The king pin can be brought closer to the brake compared to conventional devices in which a flange is provided at the base of the front wheel axle and the back plate is bolted to this flange. Therefore, even when using small-diameter tires, the kingpin offset does not become excessive, and the degree of self-alignment of the front wheel alignment increases. Furthermore, the number of parts is reduced and ease of assembly is improved, but this effect becomes particularly noticeable when the back plate is directly engaged with a member other than the front wheel axle which is integral with the front wheel axle.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a four-wheeled vehicle according to the present invention, Fig. 2 is a sectional view of the vicinity of the front wheel support portion, and Fig. 3 is a sectional view taken along the line ■-■.
Figure 4 is a partially sectional plan view of the main part, Figures 5 and 6 are the 2nd view.
A partially sectional front view of the embodiment, a sectional view taken along the line Vl-VI, and FIG. 7 is a perspective view of the third embodiment. 10...Front wheel, 22...Front wheel axle. 24.24B...Drum brake. 28.28A, 28B... Back plate. Patent Applicant Yamano Motor Co., Ltd. Agent Patent Attorney Yama 1) Written by Yu (Fig. 3, Fig. 4, Fig. 5, Fig. 7, Procedural Amendment Form (sealed) November 21, 1980 Mr. Kazuo Wakasugi, Commissioner of the Japan Patent Office■ , Indication of the case 1982 Patent Application No. 199195 2 Title of the invention Vehicle brake device 3, Person making the amendment Relationship to the case Patent Applicant Address 2500 Shingai, Iwata City, Shizuoka Prefecture Name (A O7) Yamaha Motor Co., Ltd. Ki Co., Ltd. Representative: Hideto Eguchi 4, Agent address: 6, Daiwa Bank Toranomon Building, 1-6-21 Nishi-Shinbashi, Minato-ku, Tokyo, Number of inventions increased by amendment: 0 7, Amendment regarding the subject matter of the amendment Story ℃Nino

Claims (1)

[Scope of Claims] In a vehicle in which two front steering wheels are each equipped with a drum brake, a bank plate of the drum brake is fitted onto a front wheel axle for positioning. A brake device for a vehicle, characterized in that the back plate is engaged with a member other than the front wheel axle integral with the front wheel axle to receive the brake device.