JPS622026A - Lock device - Google Patents

Abstract

PURPOSE:To obtain a lock device for connecting the torque of which can be restricted, at a low cost by placing a spacer ring having a cone-shaped section between a shaft and a boss hole and clamping this spacer ring in the axial direction by a clamping member and deforming said spacer ring to have a flat section. CONSTITUTION:A number of spacer rings 4 are inserted in an annular space between a shaft 1 and the hole 3 of a boss 2, and a first ring 8 and a second ring 9 are placed on both sides of the spacer rings. The spacer ring is made of a material like spring steel while its section is formed into a cone shape. Also, a conical projected face and a conical recessed face are formed on one sides the first and second rings 8, 9 respectively. And, both the rings 8, 9 are clamped with a bolt 6, so that the spacer rings 4 are deformed to have a flat section.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a locking device suitable for use in connecting a shaft and a boss.

(Conventional technology and its problems) There are methods for connecting the shaft and boss, such as a key, spline pin, etc., but all of them require high processing precision and hot wire strength, and are expensive.

In addition, in case excessive torque is applied, it may be necessary to provide a safety device such as a slipping clutch. If a key, pin, etc. is broken due to excessive torque when no safety device is provided, it will take time and money to repair it. Also key.

When a pin or the like breaks, considerable strain is placed on other parts of the mechanical device, which may result in damage to the mechanical device.

(Means for Solving the Problems) In order to solve these problems, the locking device of the present invention has a ring-shaped elastic locking device disposed in the annular space between the shaft and the boss hole and having a chevron-shaped cross section. It is characterized by comprising a plurality of spacer rings and a tightening tool that tightens the spacer rings in the axial direction to deform the chevron-shaped cross section into a flattened shape.

The above-mentioned operation is carried out by rings arranged on both sides (14) of one group of spacer rings, and a bolt that passes through these rings and the spacer ring and cooperates with a threaded hole in one ring to tighten the spacer ring in the axial direction. It is better to configure a fastener.

If the width of the hood is long, the spacer rings may be arranged in multiple groups.

(Function) By tightening the tightening tool, the chevron-shaped cross section of the spacer ring is deformed into a flattened shape, so the outer diameter of the spacer ring increases and the inner diameter decreases, so the shaft and boss can be rigidly connected. I can do it. Furthermore, the number of spacer rings can be increased or decreased and the tightening force can be increased or decreased depending on the torque to be transmitted. Furthermore, this locking device can also function as a safety device since it slips in response to excessive torque. .

(Embodiment) FIG. 1 shows a case where an example of the locking device of the present invention is applied to a boss and a shaft. Shaft l and hole 3 of boss 2 to which this shaft is attached
A large number of spacer rings 4 are inserted in the annular space between.

This spacer ring 4 is made of a material such as spring steel, as shown in FIGS. A concentric bolt hole 7 is formed through which the bolt 6 passes.

The material of the spacer ring may be an elastic plastic material if the transmitted torque is small.

A first ring 8 and a second ring 9 are placed on both sides (14) of a spacer ring 4 placed in an annular space between the axle load and the hole 3 of the boss 2. As shown in FIG. 3, the first ring 8 has a hole 10 through which the shaft l passes, and a concentric bolt hole 1 through which the bolt 6 passes.
1, and forms a chevron-shaped convex surface 2 which presses the spacer ring 4 at -(14). The second ring 9 has, as shown in FIG. is formed.

As shown in FIG. 1, a spacer ring 4.
Assemble the first ring 8 and the second ring 9 and insert the bolt 6 into the bolt hole 11 of the first ring 8. Pass it through the bolt hole 7 of the spacer ring 4, screw it into the screw hole 14 of the second ring 9, and tighten. Bolt 6 with spacer ring by second ring 9
Because the spacer ring is pressed against the head (14), the chevron-shaped cross section of the spacer ring is deformed to become flat, increasing the outer diameter and reducing the inner diameter at the same time. This firmly holds the shaft 1 and the boss 2 together. The bolts 6 are tightened to an appropriate degree in consideration of the torque to be transmitted.

FIG. 5 shows another embodiment of the present invention, in which a spacer ring 4
are divided into two groups and arranged. This embodiment is advantageous when the boss 2 has a long width in the axial direction. In the illustrated example, two sets of spacer rings are arranged with their chevron-shaped cross-sections facing each other.

In this case, the third ring 1 is placed between the two sets of spacer rings 4.
Place 6. The third ring has a similar shape to the first ring 8, but has a concave or convex convex surface in contact with the spacer ring on both sides (14).

(Effects of the Invention) Since the present invention is constructed as described above, it has the following remarkable effects.

■It is inexpensive to manufacture, easy to assemble, and is advantageous for connecting the shaft and boss.

2. The torque to be transmitted can be handled by both the number of spacer rings and the tightening force of the bolts.

3. The spacer ring slips when excessive torque is generated, so it can also be used as a safety device.

If you slip, you can tighten it even more if necessary.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the locking device of the present invention, FIGS. 2(a) and 2(b) are sectional views and front views of the spacer ring of the locking device of FIG. 1, and FIG. 3(a), (b) is a sectional view and a front view of the first ring of the locking device in FIG. 1, FIG. 4 fal, (b) is a sectional view and front view of the second ring of the locking device in FIG. 1, and FIG. 5 FIG. 2 is a sectional view of another embodiment of the locking device of the present invention. Machining...shaft 2...boss 3...hole
4... Spacer ring 5... Hole
6...Bolt 7...Bolt hole
8...First ring 9...Second ring 10
... Hole 11 ... Bolt hole 12 ... Chevron-shaped convex surface 13 ... Hole 14 ... Screw hole 1
5... Concave chevron 16... 3rd ring patent applicant Matsui Seisakusho Co., Ltd. Representative Patent Attorney Hidetoshi Sugimura Akira Sugimura Patent Attorney No. 1
Figure 3 Figure 4

Claims (1)

[Claims] 1. A plurality of ring-shaped elastic spacer rings (4) arranged in an annular space between the shaft (1) and the hole (3) of the boss (2) and having a chevron-shaped cross section. And this spacer ring (4
) and a tightening tool (6, 8, 9, 16) that tightens the chevron in the axial direction to deform the chevron-shaped cross section into a flattened shape. 2. Rings placed on both sides of the first group of spacer rings (
8, 9), and a bolt (6) that passes through these rings and the spacer ring and cooperates with the threaded hole (14) of one ring (9) to tighten the spacer ring in the axial direction.
2. The locking device according to claim 1, wherein the fastener is configured by: 3. The locking device according to claim 1 or 2, wherein the spacer ring (4) is arranged in a plurality of groups.