JPH053632U - Worm bearing - Google Patents

Abstract

(57) [Summary] (Corrected) [Purpose] To suppress thrust force and radial force of the output shaft of the motor to which the worm gear is fixed with one worm bearing at low cost, easy assembly, and reliable suppression. [Structure] A thrust bearing portion 6a that abuts against the tip of the output shaft 1 of the motor on the worm bearing 6, a radial bearing portion 6c that integrally supports the output shaft 1 with the thrust bearing portion 6a, and an outer periphery of the thrust bearing portion 6a. The window 6b which penetrates was provided. [Effect] The thrust force and the radial force of the output shaft 1 of the motor are suppressed, and the contact state between the thrust receiving portion 6a and the output shaft 1 can be seen directly from the window 6b provided in the worm bearing 6. Also, it occupies a small space and is inexpensive and easy to assemble.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a worm bearing that suppresses the thrust force and radial force of a worm gear as a drive source for a DAT, a CD, a cassette player, a camera and the like.

[0002]

[Prior Art]

 FIG. 5 is a cross-sectional view showing a conventional worm bearing device. In the figure, 1 is the output shaft of the motor, 2 is a worm gear fixed to this output shaft 1, and 3 is the worm gear shaft thrust bearing against which the output shaft 1 abuts when thrust force in the direction of the arrow of the output shaft 1 is generated. Reference numeral 3a denotes a flat thrust receiving portion that abuts the tip of the output shaft 1 of the worm gear thrust bearing 3, 3b denotes a screw portion provided on the outer periphery of the worm gear thrust bearing 3, and 4 denotes an output shaft through which the output shaft 1 passes. 1 is a radial bearing slidably supporting the rotation of 1; 4a is a radial bearing portion in contact with the output shaft 1 of the radial bearing 4; 5 is a base; 5a is screwed with a screw portion 3b of the worm gear thrust bearing 3; Thrust bearing support bases 5b for supporting the worm gear thrust bearings 3 are radial bearing support bases for supporting the radial bearings 4.

Next, the operation of the above worm bearing device will be described. When the output shaft 1 of the motor rotates to drive the worm gear 2 and the gear (not shown) that engages with the worm gear 2, a thrust force is generated in the direction of the arrow of the output shaft 1 or in the opposite direction due to the characteristics of the worm gear 2. Here, the thrust force in the direction of the arrow abuts the tip end portion of the output shaft 1 on the thrust receiving portion 3a to receive it. Further, here, the thrust receiving portion 3a can be adjusted in the thrust direction by the screw portion 3b in order to appropriately abut against the output shaft 1 (prevent it from being too far apart or hitting too strongly). Further, the radial bearing 4 supports the output shaft 1 by means of its bearing portion 4a, and suppresses the runout of the output shaft 1 in the radial direction. However, many conventional worm bearings do not have the radial bearing 4.

[0004]

[Problems to be solved by the device]

 Since the conventional worm bearing device is configured as described above, since the thrust receiving portion 3a and the radial bearing 4 are respectively installed, the occupied space is required accordingly, which is a cost disadvantage. Further, in the case where the radial bearing portion is not installed, there are problems that the deviation of the output shaft is not suppressed, the noise of the worm gear is large, and the gear is prematurely worn.

The present invention has been made in order to solve the above problems, and an object thereof is to obtain a worm bearing capable of suppressing thrust force and radial force of a worm gear at a small occupied space and at low cost. There is.

[0006]

[Means for Solving the Problems]

 A worm bearing according to the present invention has a worm gear fixed to an output shaft of a motor, a thrust receiving portion with which the tip of the output shaft abuts, a radial bearing portion which is integral with the thrust receiving portion and supports the output shaft, and a thrust receiving portion. It is characterized in that a window through which the contact state between the thrust receiving portion and the output shaft can be visually observed is provided on the outer periphery of the portion.

[0007]

[Action]

 In the worm bearing according to the present invention, the space occupied by the worm bearing can be reduced by integrally forming the thrust bearing portion and the radial bearing portion, and by providing the thrust bearing portion with a window, the contact between the output shaft and the thrust bearing portion can be reduced. The contact state can be visually confirmed.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a worm bearing according to the present invention, in which 1 is an output shaft of a motor and 2 is a worm gear fixed to the output shaft 1. 6 is a worm bearing according to the present invention, and FIG. 2 is a perspective view of the worm bearing. Reference numeral 6a denotes a thrust receiving portion with which the tip of the output shaft 1 abuts, and a plurality of window holes 6b are formed around the thrust receiving portion 6a so as to penetrate the worm bearing. Reference numeral 6c denotes a radial bearing portion of the output shaft 1 which is integrally formed with the thrust bearing portion 6a, and 6d denotes a screw portion formed on the outer periphery of the worm bearing 6, which is screwed to the bearing support portion 7a of the base 7. There is. Reference numeral 6e is an insertion groove of a tool for adjusting and moving the worm bearing 6 in the axial direction.

FIG. 3 is a front view showing an example of use of the worm bearing 6, in which reference numeral 8 denotes a worm wheel gear which meshes with the worm gear 2 and which meshes with another gear (not shown) on the upper stage of the worm wheel gear 8. A gear 8a for transmitting the rotational force is provided. Reference numeral 9 denotes a motor, to the output shaft 1 of which the worm gear 2 is fixed.

The worm bearing 6 configured as described above is integrally provided with the thrust bearing portion 6a and the radial bearing portion 6c, and the contact state between the output shaft 1 of the motor and the thrust bearing portion 6a can be visually checked. It is characterized by having a window 6b.

When the worm gear 2 drives the worm wheel gear 8 which meshes with the worm gear 2, a thrust force in a direction parallel to the output shaft 1 of the motor and a radial axial deflection force perpendicular to the output shaft 1 are generated. Normally, the thrust force can be suppressed only in one direction inside the motor 9, and when the large thrust force generated when the rotation load of the worm gear 2 is large is received, the rotation of the motor shaft 1 is suppressed inside the motor 9. There is a problem that the motor 9 temporarily stops rotating, or internal damage of the motor 9 occurs due to repeated use, and the output of the motor 9 drops early. Therefore, by installing the thrust receiving portion 6a, which receives the thrust force in the protruding direction of the output shaft 1 outside the motor 9, within the thrust play range of the output shaft 1 or at the position in contact with the motor shaft 1, the motor shaft due to the thrust force is provided. It is possible to effectively prevent rotation stop and deterioration of output.

Next, regarding the axial deviation in the radial direction, when the worm gear 2 is fixed directly to the output shaft 1 of the motor 9 as shown in FIG. 3, the output shaft 1 becomes long because the worm gear 2 is long. Lateral blurring (hereinafter referred to as radial runout) is likely to occur. When the radial runout of the output shaft 1 increases, the worm gear 2 locally approaches or moves away from the worm wheel gear 8, and the gear engagement becomes deeper or shallower. For this reason, when the gear cannot be smoothly transmitted and the gear meshes deeply, the force transmission efficiency deteriorates due to contact with the tooth bottom, etc., causing a reduction in output and when the gear meshing is shallow, the gear teeth do not move. The force on the tip is concentrated, and problems such as accelerated wear of the gear tooth tip are repeated during rotation. In addition, the noise of the gear increases. Therefore, if the radial bearing portion 6c is provided at the tip of the output shaft, the radial runout of the output shaft 1 can be effectively suppressed.

Next, the window 6b will be described. Conventionally, the window 6b is divided into the thrust receiving portion 3 and the radial bearing 4, and not only the cost of parts is increased but also the assembly cost is required. Therefore, although the thrust receiving portion 6a and the radial bearing portion 6c are integrated as shown in FIG. 1 of the embodiment of the present invention, this alone cannot fulfill the intended function. That is, as described above, in the worm bearing 6, the thrust bearing portion 6a and the output shaft 1 must be properly contacted with each other so that the thrust load of the output shaft 1 must be reliably received. When the window 6b is provided at the position of the portion 6a, the contact state between the thrust receiving portion 6a and the tip of the output shaft 1 can be visually confirmed, and the function of the worm bearing 6 can be reliably provided. Further, this effect also facilitates assembly. The window 6b may have any shape as long as the contact state between the thrust receiving portion 6a and the tip of the output shaft 1 of the motor can be confirmed, and the window 6b may be provided at any number of locations on the outer circumference.

Further, in the embodiment, a screw portion 6d is provided on the outer periphery of the rear portion of the worm bearing 6 so as to be screwed with the bearing support portion 7a, and a screwdriver or the like is fitted into the insertion groove 6e of the tool at the rear end, so that the worm bearing 6 The structure is such that the gap between the thrust receiving portion 6a and the output shaft 1 can be finely adjusted while rotating the main body.

In the above embodiment, the worm bearing 6 is provided with the screw portion 6d on the outer peripheral surface thereof, and the contact between the output shaft 1 and the thrust receiving portion 6a is finely adjusted and fixed to the base 7. As described above, the fixing screw 10 or the like is screwed onto the base 7 supporting the worm bearing 6 so that the worm bearing 6 can be fixed to the base 7 at a position adjusted with respect to the output shaft 1 of the motor. The function of the worm bearing 6 is the same as that of the worm bearing of FIGS. According to this, although one additional fixing screw 10 is added, the worm bearing 6 can be more easily assembled.

[0016]

[Effect of the device]

 As described above, according to the present invention, since the thrust receiving portion and the radial bearing portion of the worm bearing are integrated and the small window is provided in the thrust receiving portion, the occupying space is small and the thrust force and the radial force of the worm gear are small. The force can be suppressed by one worm bearing, and the worm bearing is inexpensive and easy to assemble.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a worm bearing according to an embodiment of the present invention.

FIG. 2 is a perspective view of a worm bearing according to an embodiment of the present invention.

FIG. 3 is a front view of a usage example of the worm bearing according to the embodiment of the present invention.

FIG. 4 is a schematic diagram of a worm bearing according to another embodiment of the present invention.

FIG. 5 is a configuration diagram of a conventional worm bearing.

[Explanation of symbols]

 1 Output Shaft 2 Worm Gear 6 Worm Bearing 6a Thrust Bearing 6b Window 6c Radial Bearing 6d Screw 6e Insertion Groove 7 Base 7a Bearing Support 8 Worm Wheel 9 Motor 10 Fixing Screw

Claims (1)

[Claims for utility model registration] Claims: 1. A worm gear is fixed to the output shaft of the motor, and a thrust bearing portion with which the tip of the output shaft contacts, and a radial bearing that is integral with the thrust bearing portion and supports the output shaft. And a window through which the contact state between the thrust receiving portion and the output shaft can be visually observed on the outer periphery of the thrust receiving portion.