JPH08338479A - Thrust force receiver of work gear - Google Patents

Abstract

PURPOSE: To make improvements in mass-productivity by dispensing with any positioning adjustment of a thrust force receiver for checking the thrust force of a worm gear. CONSTITUTION: This is a thrust force receiver unit consisting of a thrust force receiver 4 to be applied to the tip of a worm gear 3 and a spring 5 pushing this thrust force receiver 4 and imparting preload to the work gear 3, and in this constitution, supposing that a tip position of the worm gear 3 is varied by variations in machining and assembling, the thrust force receiver 4 comes into contact with a tip of the worm gear 3 at all times, and if it is pushed by the thrust force of the worm gear 3, this thrust force can be checked by resiliency of the spring 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for receiving thrust force of a worm gear used in a disc player device for compact discs of audio equipment, office automation equipment and the like.

[0002]

2. Description of the Related Art FIG. 2 shows the structure of a conventional thrust force receiving device. In FIG. 2, 10 is a worm gear, and 11 is a thrust force receiving plate of the worm gear, which slides along the positioning provided on the chassis 12. 1
3 is a motor which is a power source for rotating the worm gear, 1
4 is a rotating shaft of the motor.

The operation of the thrust force receiving device configured as described above will be described below. First, the motor 1
The thrust force receiving plate 11 is moved on the chassis 12 and fixed at a position in contact with the tip of the worm gear 10 when the thrust force receiving plate 11 is not rotated and the thrust force is not generated.
Next, when the motor 13 is driven and the worm 10 is rotated, a thrust force that moves the worm gear 10 forward is generated. The thrust force receiving plate 11 receives the thrust force, regulates the forward movement of the worm gear 10, and prevents damage to the bearing and coil inside the motor 13 that rotates the worm 10.

[0004]

However, in the above configuration, the position error when the worm gear 10 is press-fitted into the shaft 14 of the motor 13, the error in the shaft length of the motor 13, and when the motor 13 is attached to the chassis 12. The tip position of the worm gear 10 fluctuates due to an error in the thrust force receiving plate 11 and the like.
Need to be adjusted. The present invention solves the above-mentioned problems of the conventional device, can regulate the axial movement of the worm gear with a simple structure, and does not require adjustment of the mounting position of the thrust force receiving plate. The present invention provides an excellent thrust force receiving device that improves

[0005]

In order to solve the above problems, in the thrust force receiving device of the present invention, a force acts on the end portion of the thrust force receiving member on the tip side of the worm gear in a direction opposite to the thrust force. A compression spring is inserted so that a preload is always applied to the tip end position of the worm gear to eliminate the need for position adjustment of the thrust force receiving member. Further, when the worm gear tries to move due to the thrust force during rotation of the worm gear, the spring is pushed and the spring force is increased so that the force acts in the direction to push back the worm gear.

[0006]

According to the present invention, since the tip position of the worm gear is always preloaded by the above structure, it is not necessary to adjust the position of each worm gear receiving member even if the tip position of the worm gear is not uniform. Becomes Also, when the worm gear moves due to the thrust force during rotation of the worm gear, the spring at the tip of the worm gear is pushed, increasing the spring force in the direction to push back the worm gear, preventing the worm gear from moving and preventing damage to the motor bearings and coils. it can.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A worm gear thrust force receiving device according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows the configuration of a worm gear thrust force receiving device according to the first embodiment of the present invention. In FIG. 1, 1 is a motor, 2 is a motor shaft, and 3 is a worm gear, which is press-fitted into the shaft 2. Reference numeral 4 is a thrust force receiver applied to the tip of the worm gear 3, 5 is a compression spring for pushing the thrust force receiver 4, 6 is a bracket for fixing the motor 1 and supporting the thrust force receiver 4, and 7 is a chassis to which the bracket 6 is attached. .

The operation of the worm gear thrust force receiving device constructed as described above will be described below with reference to FIG. The worm gear 3 is press-fitted onto the shaft 2 of the motor 1. Insert the compression spring 5 at the end of the thrust force receiver 4,
Insert into the mounting hole of the bracket 6. Worm gear 3
While pressing the thrust force receiver 4 with the tip of the worm gear 3, the motor 1 into which is pressed is inserted into the mounting hole of the bracket 6 and screwed. The mounting length of the compression spring 5 varies depending on the variation in the length of the worm gear 3 at the tip position.
Due to the variation in the press-fitting length, the length is provided at the shortest position to generate a predetermined spring force. This allows
Even if the tip position of the worm gear 3 varies, the worm gear 3 is always preloaded by the spring, and the conventional adjustment of the position of the thrust force receiving member becomes unnecessary. Next, when the worm gear 3 rotates and thrust force is generated, the tip of the worm gear 3 pushes the thrust force receiver 4 and tries to compress the compression spring 5. The spring force of the compression spring 5 increases by the amount of compression, and the thrust force receiver 4 is pushed back and the worm gear 3 is pushed back. As a result, movement of the worm gear 3 is prevented, and damage due to collision of the bearing and coil inside the motor 1 can be prevented.

[0009]

As described above, according to the present invention, by applying a preload to the tip of the worm gear by the spring in advance, the thrust is applied to the worm gear tip position variation due to the worm gear press-fitting position error, motor shaft length error, and the like. It is not necessary to adjust the force receiving position for each unit, and the thrust force can be suppressed by the repulsive force of the spring.

Further, when the worm gear moves due to the thrust force during rotation of the worm gear, the spring at the tip of the worm gear is pushed and the spring force in the direction to push back the worm gear increases, preventing the worm gear from moving and damaging the motor bearing and coil. It can be prevented.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a thrust force receiving device for a worm gear according to an embodiment of the present invention.

FIG. 2 is a schematic view of a conventional thrust force receiving device for a worm gear.

[Explanation of symbols]

 1 Motor 2 Motor Shaft 3 Worm Gear 4 Thrust Force Receiver 5 Compression Spring 6 Bracket 7 Chassis 10 Worm Gear 11 Thrust Force Receiver 12 Chassis 13 Motor 14 Motor Shaft

Claims (1)

[Claims] 1. A thrust force receiving device for a worm gear, comprising a thrust force receiving member at the tip of the worm gear, wherein a compression spring that exerts a force in a direction opposite to the thrust force is provided at the end of the thrust force receiving member at the tip side of the worm gear. A thrust force receiving device that is inserted and constantly applies a preload to the tip position of the worm gear, eliminating the need to adjust the position of the thrust force receiving member.