JPH04143111A - Torsion bar spring - Google Patents

Abstract

PURPOSE:To facilitate fastening operations by forming a serration part in the through hole of a torque arm, forming an internal thread part and a serration part on one end part of a torsion bar spring being fixed to the through hole, and connecting both the through hole and the torsion bar spring by the serration parts to fix them by means of bolts. CONSTITUTION:In fastening operation of a torsion bar spring 1, one end part 1a of the torsion bar spring 1 is first inserted into the through hole 27 of a torque arm 3 to serration-connect them to each other. Then, a bolt 2 is screwed through the hole 28 of an arm part 8a, a collar 13, the hole 29 of a breast part 8b into an internal thread part 19 to fasten the torsion bar spring 1 to the torque arm 3. At this time, the serration of one end part 1a and the serration part 18 of the through hole 27 are in mesh with each other to prevent the torsion bar spring 1 from rotating, and a thread part 2a can be easily screwed into the internal thread part 19.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a torsion bar spring fastening structure for fastening a torsion bar spring to a suspension arm of an automobile.

BACKGROUND OF THE INVENTION Some conventional automobile suspensions use torsion bar springs (see Japanese Patent Application Laid-open No. 59143706).

FIG. 2 is a partially sectional plan view of a suspension using a torsion bar spring, and FIG. 3 is a side view of the example shown in FIG.

In both figures, 11 is an upper arm that is a suspension arm, 8 is a lower arm that is a suspension arm, and the ends of the upper arm 11 and the lower arm 8 on the outer side of the vehicle body are connected through ball joints 9 and 10, respectively. It is connected to a knuckle (not shown) that rotatably supports the wheel. The upper arm 11 has two arms lla and llb extending toward the center of the vehicle body, and the ends of these arms lla and llb are rotatably attached to a mounting rod 12 attached to the vehicle body. That is, collars 15 and 14 are formed at the ends of arms 11a and llb, respectively, and the mounting rod 12 is inserted through bushes disposed within these collars 15 and 14.

Further, the lower arm 8 has two arm portions 8 extending toward the center of the vehicle body.
a and 8b, and a collar 13 is disposed between the arm portions 8a and 8b. This collar 13 is supported via a bush 6 by a sleeve 7 provided on the vehicle body.

21 is a bolt, and this bolt 21 is inserted into the collar 13 through a hole 29 formed in the arm portion 8b.
It is inserted into a hole 28 formed in a. The bolt 21 is screwed into a nut 22 and fixed between the arms 8a and 8b. A torque arm 26 is fixed to the arm portion 8b by a bolt 5, and a head 21a of the bolt 21 is disposed within a through hole 27 of the torque arm 26.

FIG. 4 is a partially enlarged view of FIG. 2, and is a sectional view of the fastening structure of the torsion bar spring 20. In FIG. 4, one end 20a of the torsion bar spring 20 is placed in the through hole 27 of the torque arm 26 together with the head 21a of the bolt 21. As shown in FIG. Further, the other end of the torsion bar spring 20 is fixed to the vehicle body (not shown). One end 2 of the torsion bar spring 20
Serrations are formed around Oa and are adapted to mesh with the serrations 24 of the through hole 27.

Note that 16 is a shock absorber, 17 is a compression rod, and 23 is a bracket provided on the vehicle body.

Problems to be Solved by the Invention In the conventional torsion bar spring fastening structure described above, the head 21a of the bolt 21 has a serration portion 25.
This serration portion 25 and the serration portion 24 of the through hole 27 of the torque arm 26 are engaged to prevent rotation when the nut 22 is screwed onto the bolt 21.

However, the head 21. Since the bolt 21 with the serrations 25 formed on the portion a is not a normal bolt but has a special shape, it is disadvantageous in that it is expensive.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a torsion bar spring fastening structure for fastening a torsion bar spring to a suspension arm of an automobile, which has a through hole and has a serration section in the through hole. A torque arm is formed and fixed to the suspension arm, and a serration portion that engages with the female thread portion and the serration portion of the through hole is formed at one end thereof, and this one end portion is inserted into the through hole of the torque arm. Through the torsion bar spring and the hole formed in the suspension arm,
The present invention is characterized by comprising a bolt that is screwed into an internal threaded portion formed at one end of the torsion bar spring.

One end of a torsion bar having a female thread is inserted into the through hole of the operating torque arm, and the respective serrations are engaged with each other. The suspension arm is inserted into the female threaded portion of the threaded portion of the bolt through a hole formed in the suspension arm, and is screwed into the female threaded portion of the threaded portion by rotating the bolt. This causes the torsion bar spring to be fastened to the suspension arm.

Embodiment FIG. 1 is a sectional view of the fastening structure of a torsion bar spring according to an embodiment of the present invention, and the same reference numerals are given to the same members as in the example of FIG. 4.

In FIG. 1, reference numeral 2 indicates a bolt having a normal shape rather than a special shape, and an end portion 2a of this bolt 2 is a threaded portion. Reference numeral 1 designates a torsion bar spring, and one end 1a of the torsion bar spring 1 is provided with serrations and a female threaded portion 19. Further, 3 is a torque arm, and this torque arm 3 is fixed by a screw 5 to an arm portion 8b of a lower arm 8, which is a suspension arm. A serration portion 18 is formed in the through hole 27 of the torque arm 3. 2, 8a is the arm part of the lower arm 8, 6 is a bushing, 7 is a sleeve, 13
is in color.

Now, in the above configuration, the torsion bar spring 1
In the fastening operation, first, one end 1a of the torsion bar spring 1 is inserted into the through hole 27 of the torque arm 3, and the serrations of the one end 1a and the serrations 18 of the through hole 27 are engaged. Next, the bolt 2 is
The torsion bar spring 1 is inserted into the female threaded part 19 through the hole 28 of the a, the collar 13, and the hole 29 of the arm part 8b, and the bolt 2 is rotated to screw the threaded part 2a and the female threaded part 19 together. It is fastened to the torque arm 3.

When rotating the bolt 2 and screwing the threaded portion 2a and the female threaded portion 19 together, the serrations on the one end portion 1a and the through hole 2
Since the serrations 18 of 7 are engaged with each other, the torsion bar spring 1 does not rotate, and the threaded portion 2a and the female threaded portion 19 can be easily screwed together.

In this way, one end 1a of the torsion bar spring 1
By forming the female threaded portion 19 on the torsion bar spring 1, the bolt 2 required to fasten the torsion bar spring 1 does not have any special shape, and an inexpensive ordinary bolt can be used, thereby reducing costs. be able to. Furthermore, in the past, in addition to the specially shaped bolt 21, the nut 22
However, in the example shown in FIG. 1, the nut is not necessary, so the number of parts can be reduced.

Furthermore, conventionally, the torque arm 26 requires that the one end 20a of the torsion bar 20 and the head 21a of the bolt 21 be arranged in series in the through hole 27, and the thickness of the torque arm 26 is smaller than that of the one end 20a. Thickness and head 21a
However, in the example shown in Fig. 1, the thickness of the torque arm 3 only needs to be equal to the thickness of the one end 1a, so the thickness of the torque arm can be shortened and downsizing is possible. becomes.

Effects of the Invention As described above, according to the present invention, a torsion bar spring fastening structure for fastening a torsion bar spring to a suspension arm of an automobile has a through hole, a serration portion is formed in the through hole, and the suspension arm is fastened to a torsion bar spring. A torsion bar spring having a torque arm fixed to the arm, a female threaded portion and a serration portion that engages with the serration portion of the through hole formed at one end thereof, and this one end portion being inserted into the through hole of the torque arm. and,
Since the suspension arm is equipped with a bolt that is threaded through a hole formed in the suspension arm with an internal thread formed at one end of the torsion bar spring, special bolts are required to fasten the torsion bar spring. Ordinary bolts can be used instead of expensive ones with a different shape, and costs can be reduced. Furthermore, since there is no need to use a nut, which was necessary in the past, the number of parts can be reduced. Furthermore, unlike the conventional example, the head of the bolt is not placed in the through hole of the torque arm, so the thickness of the torque arm only needs to be taken into account the thickness of one end of the torsion bar spring, so the thickness can be reduced. This enables miniaturization.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the configuration of an embodiment of the present invention, FIG. 2 is a partial cross-sectional plan view of a suspension using a conventional torsion bar spring fastening structure, and FIG. 3 is a side view of the example shown in FIG. , FIG. 4 is a sectional view of a conventional torsion bar spring fastening structure. DESCRIPTION OF SYMBOLS 1... Torsion bar spring, la... One end, 2... Bolt, 2a... Threaded part, 3... Torque arm, 8... Lower suspension (suspension arm), 8a, 8b. ...Arm part, 18... Serration part, 19... Female thread part, 27... Through hole, 28
．． 29... hole. Figure Figure

Claims (1)

[Claims] (1) A torsion bar spring fastening structure for fastening a torsion bar spring to a suspension arm of an automobile includes a torque arm that has a through hole, a serration portion is formed in the through hole, and is fixed to the suspension arm, and a female thread. A serration portion that engages with the serration portion of the through hole is formed at one end thereof, and this one end portion is inserted through the torsion bar spring inserted into the through hole of the torque arm and the hole formed in the suspension arm. A fastening structure for a torsion bar spring, comprising: a bolt formed at one end of the torsion bar spring and threadedly engaged with a female threaded portion;