JPS6235939B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, an outer end of a lower control arm extending in the width direction of a vehicle body is swingably attached to a support member that rotatably supports a wheel, and an inner expandable drum is attached to the wheel. The present invention relates to a strut-type suspension of an automobile equipped with a brake device.

Conventionally, in this type of strut type suspension, as shown in FIG. Due to space constraints, it is not possible to make the distance δ between the ground contact center 5 of the wheel 1 and the outer end attachment part 4 small;
Generally, they were large, about 50 to 70 mm. However, if the road surface input acting on the wheel 1 at the center of ground contact 5 is W, and the distance between the outer end attachment part 4 and the upper mount part 8 of the strut damper 6 on the vehicle body 7 is L, then the strut damper 6's A reaction force F expressed by the first equation acts on the upper mount portion 8.

F=δW/L...(1) Therefore, if the interval δ is large, the bending moment (F・L) acting on the strut damper 6 will be large, causing the rod 9 of the strut damper 6 to bend. Deformation occurs, and friction prevents the rod 9 from sliding smoothly within the shell 10, resulting in poor riding comfort and noise during driving.

The present invention eliminates these conventional drawbacks and provides a strut-type suspension for an automobile that achieves smooth operation of the strut damper, improves riding comfort, and prevents noise generation. The purpose is to

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. In FIGS. 2 and 3, a wheel 1
A hub 11 is fixed to the center of the hub 11.
is rotatably supported by a hub carrier 13 as a support member via a bearing 12. The lower control arm 3 extending in the width direction of the vehicle body 7 is a so-called arm, and its inner end (the right end in FIGS. It is pivoted to the vehicle body 7 via a bush 14 so as to be swingable around an axis parallel to the vertical direction in the figure. On the other hand, the outer end of the lower control arm 3 is connected to the hub carrier 13 via a single bushing 15.
It is swingably mounted on the

A branch arm 16 that extends downward and inward at an angle with the rotational axis of the wheel 1 and is branched into two is integrally provided at the lower part of the hub carrier 13. One end of the radius rod 19 is swingably connected via a pair of bushes 17 and 18. The radius rod 19 extends substantially horizontally, and the other end is swingably connected to the vehicle body 7. The toe of the wheel 1 is regulated by a pair of bushes 17, 18 and a radius rod 19 as described above. By doing so, even if sufficient longitudinal compliance is given to the wheels 1, it is possible to prevent toe changes that impair steering stability from being affected. In addition, in order to minimize toe changes due to the vertical stroke of the suspension, the axis 2 of the pair of bushes 17 and 18 is
0 and a straight line 21 connecting the other end of the radius slot 19 and the inner end of the lower control arm 3 are set to be substantially parallel to each other.

An arm 22 is integrally provided on the upper part of the hub carrier 13, and the lower part of the shell 10 of the strut damper 6 is fixedly connected to this arm 22. The rod 9 of this strut damper 6 extends upward, and its upper end is connected to the upper mount part 8 and is attached to the vehicle body 7.
mounted on. Further, a spring 23 is interposed between the center portion of the lower control arm 3 and the vehicle body 7. Note that instead of providing the spring 23 between the lower control arm 3 and the vehicle body 7, a spring may be provided between the shell 10 of the strut damper 6 and the upper end of the rod 9, surrounding the rod 9.

With reference to FIG. 4 and FIG. 5, wheel 1
is provided with an internally expanding drum brake device 2.
Brake drum 24 of this drum brake device 2
is integrally fixed to the hub 11, so that the brake drum 24 rotates together with the wheel 1. Inside the brake drum 24, the brake drum 24
A pair of half-moon-shaped shoes 25 are disposed in pressure contact with the inner surface of the shaft, and one end of these half-moon-shaped shoes 25 is supported in contact with an anchor block 27. A cylinder 26 is connected to the other end of each half-moon-shaped shoe 25, and by driving this cylinder 26, each half-moon-shaped shoe 25 is moved in a direction in which the other ends thereof move away from each other with the anchor block 27 as a fulcrum. It rotates and comes into pressure contact with the inner surface of the brake drum 24. A raised abutment 29 for fixing the anchor block 27 is formed on the inner surface 28a of the back plate 28. Also, the outer surface 28b of the back plate 28
A recess 30 recessed toward the abutment 29 is provided.

According to the invention, the outer end attachment portion 4 of the lower control arm 3, which is attached to the hub carrier 13 via the bush 15, is set to be located within the recess 30. As a result, the distance δ between the ground contact center 5 of the wheel 1 and the outer end attachment portion 4 can be set to a minimum value of about 0 to several mm, as is clear from the figure. Note that in order to facilitate placement of the outer end mounting portion 4 in the recess 30, the hub 11 is attached to the bearing 1.
It is designed to be inserted into the inner ring of No.2.

Next, to explain the operation of this embodiment, since the interval δ is set extremely small as mentioned above,
Based on the first equation described above, the reaction force F acting on the upper end of the rod 9 in the strut damper 6 becomes smaller, and therefore the bending moment acting on the rod 9 becomes smaller. As a result, Rod 9 is Ciel 1
It is possible to smoothly slide within 0, improving riding comfort and suppressing noise generation as much as possible.

As described above, according to the present invention, an abutment is provided on the inner surface of the back plate in an internally expanding drum brake device, and a recess that is recessed toward the abutment is provided on the outer surface, Since the outer end attachment portion of the lower control arm to the support member is disposed within the recess so as to be close to the ground contact center of the wheel, the bending moment acting on the rod of the strut damper due to road surface input to the wheel is reduced. As a result, the frictional resistance of the strut damper is reduced, allowing smooth operation, improving riding comfort and preventing noise generation.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram for explaining the conventional problems, FIGS. 2 to 5 are diagrams showing an embodiment of the present invention, FIG. The figures are a cross-sectional view taken along the line -- in FIG. 2, FIG. 4 is an enlarged cross-sectional view of a portion indicated by an arrow in FIG. 2, and FIG. 5 is a cross-sectional view taken along the line -- in FIG. DESCRIPTION OF SYMBOLS 1...Wheel, 2...Inner expanding drum brake device, 3...Lower control arm, 4...Outer end attachment part, 5...Center of ground contact, 7...Vehicle body, 13...
Hub carrier as a support member, 27... Anchor block, 28... Back plate, 28a...
...Inner surface, 28b...Outer surface, 29...Abutment, 3
0...Concavity.

Claims (1)

[Claims] 1. A strut-type suspension for an automobile, in which the outer end of a lower control arm extending in the width direction of the vehicle body is swingably attached to a support member that rotatably supports a wheel, and the wheel is provided with an inwardly expanding drum brake device. In the drum brake device, the inner surface of the back plate of the drum brake device has a raised abutment for fixing the anchor block, and the outer surface of the back plate is provided with a recess that is recessed toward the abutment, and the lower control A strut-type suspension for an automobile, characterized in that an outer end attachment portion of the arm to the support member is disposed within the recess so as to be close to the ground contact center of the wheel.