JPS6114728Y2 - - Google Patents

Description

[Detailed description of the invention] The invention relates to a fixing structure between a frame and a member,
More specifically, the present invention relates to a structure for fixing a member to a frame having two side parts spaced apart from each other and each side having a hole for a bolt.

For example, a bracket for attaching a center arm provided to an automobile frame and a steering device is fixed to the frame and the bracket using a through-bolt, with a hole for inserting the bolt formed therein. In this case, the holes provided in the frame and the bracket are made larger than the diameter of the bolt in consideration of manufacturing errors, so a gap is created between the fixed bolt and the wall surface of the hole in the bracket.

However, if the frame happens to be a box frame, the side part where the head of the bolt engages and the side part where the threaded part of the bolt engages via a washer or other part are arranged at a distance from each other. In this case, increasing the tightening torque or increasing the number of tightening bolts deforms the two opposing sides of the frame, so the tightening torque and number of bolts are limited.

Therefore, depending on the magnitude of external force acting on the center arm while the car is running, for example, there is a risk of slipping between the center arm bracket and the frame, causing the steering wheel to shift from the center. If you proceed further, the bolt may break.

An object of the present invention is to provide a fixing structure that can increase the tightening torque and prevent slippage between the center arm bracket and other members and the frame.

The present invention includes a frame having first and second side portions spaced apart from each other and each side having a hole for a bolt; A tube having a structure in which a member having a structure is fixed with a bolt and a nut, the end surface of which is in contact with the second side part and the intermediate part of which is locked with the first side part, and the locked part of the tube. a tube having an end extending from the tube and projecting into the hole of the member, into which the bolt can be inserted; and a tube disposed between the outer peripheral surface of the projecting end of the tube and the wall surface of the hole of the member. and a cone washer tapered inward.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

The present invention has a frame 10 as shown in FIG.
This is a structure for fixing the bracket 12 and the bracket 12, which is a member to be fixed. The frame 10 has a side part 17 that engages with a head 15 of a bolt 14 inserted into a hole provided in the frame, and a side part 18 that engages with a threaded part 16 of the bolt 14 via a part, with a gap between them. This is the type that is placed facing each other, separated from each other.

In the example shown in FIG. 2, the frame 10 has a side frame as one side 17 and a side frame as the other side 1.
It is provided with an inner channel as 8, and the whole is formed in the shape of a box frame. frame 1
0, a bracket 12 for attaching a center arm 20 provided in a steering device of an automobile is fixed to the outside of a side portion 18.

A tube 24 through which the bolt 14 is inserted is formed in a hole 2 provided in each of the side parts 17 and 18 of the frame.
2 and 23 centering on the central axes. The tube 24 is brought into contact with one side 17 at its end face and is locked to the other side 18 in the middle thereof,
It has an end 25 extending from the locked portion. In the illustrated example, the tube 24 has a shoulder 30 in the middle, and the end 25 extending from the shoulder 30 is reduced in diameter and projects outwardly through the hole 23 in the side 18 . Since the bolt 14 is inserted inside the tube 24,
The end portion 25 is rounded and reduced in diameter to such an extent that the bolt 14 can be inserted therethrough.

A reinforcing bracket support base 28 is arranged inside the side portion 18. The diameter of the hole 29 provided in the bracket support base 28 is the same as the diameter of the hole 23 provided in the side portion 18, and
It is substantially equal to the outer diameter of the reduced diameter end 25 of the tube 24. This causes the tube 24 to be locked to the bracket support base 28 at its shoulder 30. If reinforcement by the bracket support base 28 is not required, the tube is locked to the side 18.

The two legs 13, 13 of the bracket 12 rest on the outside of the side 18. The bolt insertion hole 32 provided in each leg portion 13 is formed to have a larger diameter than the hole 23 provided in the side portion 18 . In the illustrated example, the leg 13
The hole 32 is provided with a tapered surface 33 whose diameter widens outward. When the leg 13 is in place, the end 25 of the tube 24 projecting outwardly from the side 18 is located in the hole 32 in the leg 13. Preferably, the length of the end 25 of the tube 24 is such that the end 31 thereof does not project outwardly beyond the outer surface 34 of the leg 13.

A cone washer 36 is attached to the end 2 of the tube 24.
5 and the tapered surface 3 which is the wall surface of the hole 32
It is located between 3 and 3. cone washer 36
is formed in a tapered shape such that the outer diameter becomes smaller as it goes inward, that is, as it approaches the side portion 18, and fits into the tapered surface 33 of the hole 32. As shown in FIG. 3, the cone washer 36 is provided with a single slit 37 in the axial direction. The length of the cone washer 36 in the axial direction is
It is longer than the length of the tapered surface 33 provided in the hole 32 in the axial direction.

To use the fixing structure according to the present invention, the side 1
The pair of legs 13 of the bracket 12 are placed on the outside of the bracket 8 and the end 25 of the tube 24 is placed into the hole 32 of each leg 13. Next, a cone washer 36 is placed between the outer circumferential surface 35 of the tube 24 and the tapered surface 33. In this state, hole 2 of side part 17
2 and the tube 24, the threaded portion 16 of the bolt 14 protrudes outward from the end 31 of the tube 24, so that the cone washer 3
6, apply the plate washer 38 to the screw part 1.
6 and tighten the nut 40.

Cone washer 3 is tightened by tightening nut 40.
6 is press-fitted between the outer peripheral surface 35 and the tapered surface 33 of the tube 24. At this time, the cone washer 36
does not come into direct contact with the threaded portion 16 of the bolt 14, so it is press-fitted smoothly. As a result of the press-fitting, the gap between the slits 37 provided in the cone washer 36 is narrowed and the cone washer 36 is elastically deformed, and due to the wedge action of the cone washer 36,
The legs 13 of the bracket 12 will be firmly fixed to the sides 18 of the frame 10 and to the tubes 24.

The tightening force by the cone washer 36 is also applied in the axial direction of the bolt 14 at the same time.
One side 1 of the opposing sides 17 and 18 of 0
7 is in contact with the end surface of the tube 24, and the bracket support base 28 is located inside the other side 18.
Since the middle of the tube 24 is locked to the holder, deformation of the side parts 17 and 18 is prevented.

In the example above, frame 10 is a box frame. In the present invention, outside the box frame, a pair of side parts are arranged facing each other with a large interval between them, and can be deformed by tightening torque. It can also be applied to a groove-shaped frame with a U-shaped cross section. Also,
In addition to the center arm bracket provided in the steering device as in the example above, the members fixed to the frame include members that need to be fixed to the frame with high rigidity, such as the steering gear box. be done.

In the above example, a tapered surface is formed in the hole provided in the bracket. By forming a tapered surface in the hole, in conjunction with the tapered surface of the cone washer,
This is the most preferred because it maximizes the wedge effect. However, the hole provided in the bracket can also have a straight surface without a taper, and even in this case, the tapered surface of the cone washer will create a wedging effect. Further, the slit of the cone washer can be made unnecessary.

According to the present invention, the following effects can be obtained.

The cone washer can fill the gap between the bolt and the hole wall of the member, the wedge action of the cone washer can press the member against the frame and increase the frictional force, and the fixed part can be attached to the member, the cone washer and Since the end of the tube is integrated and strong, the members can be firmly fixed. Therefore, even if the diameter of the hole provided in the member is made larger than the outer diameter of the bolt to account for manufacturing errors, the member will not shift during use.

Since the end face of the tube comes into contact with one of the pair of side sections and the middle of the tube is engaged with the other, the side sections will not deform even if a large tightening torque is applied, thereby ensuring the robustness of the member.

The end of the tube protrudes into the hole of the member, and the cone washer is placed between the outer peripheral surface of the end and the hole wall of the member, so when the cone washer is press-fitted, it prevents contact between the cone washer and the thread of the bolt. It can be prevented. This allows smooth press-fitting of the cone washer and prevents thread wear.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a frame and bracket fixed by the fixing structure according to the present invention, and FIG.
The figure is a cross-sectional view taken along line 2-2 in Figure 1.
FIG. 3 is a front view of the cone washer. 10...Frame, 12...Bracket, 14
... Bolt, 17, 18 ... Side part, 20 ... Center arm, 22, 23, 32 ... Hole, 24 ... Tube, 25 ... End, 26 ... Spacing, 36 ...
Cornwasher, 40...Natsuto.

Claims (1)

[Scope of utility model registration request] a frame having first and second spaced apart sides and a bolt hole in each side;
A structure in which a member is disposed outside the first side part and has a hole for a bolt, and is fixed with a bolt and a nut, the end face being in contact with the second side part, and the first side being in contact with the second side part in the middle. a tube that is latched to a portion of the tube, has an end that extends from the latched portion and projects into a hole of the member, and that allows the bolt to be inserted therethrough; A fixing structure for fixing a frame to a member, the structure including a cone washer disposed between an outer peripheral surface and a wall surface of a hole in the member and tapered inward.