KR101264067B1 - A bearing retainer and a motor with bearing support structure using thereof - Google Patents

Abstract

PURPOSE: A bearing retainer and a motor having a bearing support structure using the same are provided to prevent separation of a bearing by strongly affixing the inner surface of an assembly hole. CONSTITUTION: A base block is combined with the front side of a yoke housing. A bearing assembly groove(204) is formed in the front side of the base block. A bearing insertion hole(202) penetrates the bearing assembly groove. A bearing retainer(300) is pressed in the bearing assembly groove. An expansion hole is formed in the rear side of the bearing assembly groove.

Description

A bearing retainer and a motor with bearing support structure using thereof

The present invention relates to a bearing retainer for supporting a bearing installed on the base plate of the motor and preventing separation. More specifically, the present invention can be firmly fixed to the base block by press-fitting and supporting the base block without a separate fixing means. It relates to a motor having a bearing retainer and a bearing support structure using the same.

The motor is composed of an armature assembly in which an armature coil is wound on a core of a rotor shaft, and a yoke assembly having a permanent magnet on an inner surface thereof. After holding and arranging the pores with a magnet, when a current is applied to the armature coil, electromagnetic force is generated between the coil and the permanent magnet, thereby generating rotational power in the armature assembly.

In such a motor, the front and rear ends of the rotor shaft are rotatably supported by the bearing. The bearing coupled to the rear end of the rotor shaft is inserted and supported in the bearing receiving groove formed at the rear end of the yoke housing, and the bearing coupled to the front end of the rotor shaft is It is inserted into and supported by a base block coupled to the front of the yoke (see Patent Documents 1 and 2, for example).

In the bearing inserted into the base block, its inner ring must be pressed into the rotor shaft and rotate with the rotor, and the outer ring enters through the bearing assembly hole of the base block and is inserted into and fixed in the bearing insertion hole.

In this case, since the outer ring of the bearing serves to set the axial position of the bearing, it must be firmly held so as not to deviate in the direction of the bearing assembly hole after installation.

However, in the related art, as an example of a technique for preventing the outer ring of the bearing from being detached, it is known to prevent the axial flow or detachment by coupling the snap ring to the bearing insertion hole or the shaft, but between the hole and the snap ring into which the snap ring is inserted. Since there is an axial play, there is a fear that the bearing will flow in the axial direction.

In addition, when the lubricant of the bearing is supplied from the operating device driven by the motor, such as a motor for driving a hydraulic pump, the bearing must be connected to the operating device so that the lubricant can be smoothly supplied, but the bearing is connected to the operating device. There is no method to prevent the axial flow or departure of the bearing, and even if the method is devised, it is difficult to avoid structural complexity.

Republic of Korea Patent Registration No. 10-1040389 Republic of Korea Patent Registration No. 10-0915063

The present invention has been developed to solve the above-mentioned conventional problems, the bearing is firmly supported on the base block by a simple structure to press the bearing assembly groove without a separate fixing means to prevent the axial deviation of the bearing It is an object to provide a motor having a retainer and a bearing support structure using the same.

The above object of the present invention is a bearing retainer for preventing the axial flow by pushing the outer ring of the bearing, the base plate is formed in the center with a relief hole larger diameter than the inner ring of the bearing; In the outer periphery of the base plate is bent inclined toward the opposite direction of the insertion direction with respect to the bearing assembly groove, the outer diameter (d) after the bending includes an inclined extension having a diameter larger than the inner diameter (D) of the bearing assembly groove, When the inclined extension portion is forcibly pressed into the bearing assembly groove, the inclined extension portion is bent more elastically in the opposite direction of the indentation, and the tip end portion of the inclined extension portion is extended radially outward by the elastic restoring force of the inclined extension portion after the indentation. It is achieved by elastically pressing and supporting the inner surface of the bearing assembly hole.

In one embodiment, the relief hole consists of a regular hexagonal hole.

Motor according to one direction of the present invention, the base block is coupled to the front of the yoke housing; A bearing assembly groove formed forward from the rear of the base block; A bearing insertion hole formed through the front end of the bearing assembly groove; The rotor shaft is pressed into the inner ring, the outer ring is inserted into the bearing insertion hole, and the outer ring is joined with a stopper ring that is in close contact with the front inner surface of the bearing assembly groove so that the stopper ring is in close contact with the front inner surface of the bearing assembly groove. and; And a bearing retainer press-fitted into the bearing assembly groove to push the outer ring of the bearing to prevent axial flow, wherein the bearing retainer includes: a base plate having a relief hole having a diameter larger than that of the inner ring of the bearing; It is bent at an outer circumference of the base plate toward the opposite direction of the insertion direction with respect to the bearing assembly groove, and the outer diameter (d) after bending includes an inclined extension having a diameter larger than the inner diameter (D) of the bearing assembly groove, When the inclined extension portion is forcibly pressed into the bearing assembly groove, the inclined extension portion is bent more elastically in the opposite direction of the indentation, and the tip end portion of the inclined extension portion is extended radially outward by the elastic restoring force of the inclined extension portion after the indentation. The inner surface of the bearing assembly hole is elastically pressed to support the structure.

In one embodiment, the expansion hole is formed behind the bearing assembly groove of the base block, the oil seal is inserted into the expansion hole.

In one embodiment, the relief hole of the bearing retainer may comprise a regular hexagonal hole.

In addition, a bearing retainer can be comprised by any one of a phosphor bronze plate, a hard steel plate, a spring steel plate, and a stainless steel plate.

According to the motor having a bearing retainer and a bearing support structure using the same according to the present invention, elastic restoring force is imparted to its inclined extension by press-fitting the bearing retainer, and the tip end portion of the inclined extension is radially outward by the elastic restoring force. As it expands, the inner surface of the bearing assembly hole is firmly fixed by elastically pressing, and thus axial flow or detachment of the outer ring of the bearing can be easily prevented.

In addition, even if the rear portion of the bearing is opened by the bearing assembly hole and the expansion hole, the simple structure using the bearing retainer can easily prevent the bearing from being separated, and the motor is simple and easy to assemble.

1 is a perspective view showing the appearance of a motor according to the present invention.
2 is an overall cross-sectional view of the motor in the present invention.
3 is a cross-sectional view showing a bearing retainer according to the present invention and a state in which it supports a bearing.
4 is a perspective view of a bearing retainer according to the present invention.
FIG. 5 is a view for explaining an assembly process of an oil seal subsequent to FIG. 3.
FIG. 6 is a view for explaining a process of assembling the rotor shaft after FIG. 5.

EMBODIMENT OF THE INVENTION Hereinafter, the Example of this invention is described concretely, referring an accompanying drawing.

As shown in FIG. 1, the motor includes a yoke housing 100, a base block 200 is coupled to the front of the yoke housing 100, and the rotor shaft 120 is moved forward of the base block 200. It protrudes.

In front of the base block 200, a device driven by the rotor shaft 120, for example, a hydraulic pump, is installed.

As shown in FIG. 2, a permanent magnet 110 is disposed on an inner surface of the yoke housing 100, and a rotor shaft 120 wound around an armature coil 130 is disposed inside the permanent magnet 110.

The rear end and the front end of the rotor shaft 120 are rotatably supported by the bearings 150 and 160 in the yoke housing 100 and the base block 200, respectively.

In addition, the bearing retainer 300 according to the present invention is disposed behind the bearing 160 installed in the base block 200, and the oil seal 400 is disposed behind the bearing retainer 300.

3 is a cross-sectional view showing a bearing retainer 300 and a state in which it supports the bearing 160 according to the present invention, Figure 4 is a perspective view of the bearing retainer.

3 and 4, the bearing assembly groove 204 is formed in the base block 200 from the rear to the front, and the bearing insertion hole 202 penetrates from the front end of the bearing assembly groove 204. Is formed.

In one embodiment, when installing the oil seal 400 for sealing the rear of the bearing 160 to prevent the bearing lubricant from leaking into the motor, the bearing assembly groove of the base block 200 ( 204, the expansion hole 206 is formed at the rear, and the oil seal 400 is inserted into the expansion hole 206 is installed.

As for the bearing 160, the rotor shaft 120 (refer FIG. 1 and FIG. 2) is press-fitted into the inner ring 162, and the outer ring 164 is inserted in the bearing insertion hole 202 mentioned above.

The outer ring 164 of the bearing 160 is coupled to the stopper ring 168 in close contact with the front inner surface of the bearing assembly groove 204, the stopper ring 168 thereof is the front inner surface of the bearing assembly groove 204. It is located in close contact with.

The bearing retainer 300 is press-fitted into the bearing assembly groove 204 to elastically press the outer ring 164 of the bearing 160 forward to prevent the flow and departure in the axial direction.

The bearing retainer 300 has a base plate 302 in which a relief hole 304 having a diameter larger than that of the inner ring 162 of the bearing 160 is formed at the center thereof, and an inclined extension portion is formed on the outer circumference of the base plate 302. 306 extends radially outwardly.

The inclined extension portion 306 is bent from the outer circumference of the base plate 302 to the opposite direction of the insertion direction with respect to the bearing assembly groove 204 (that is, the right side in the drawing), and the outer diameter d after bending ) Has a diameter larger than the inner diameter D of the bearing assembly groove 204.

As such, since the outer diameter d of the inclined extension portion 306 of the bearing retainer 300 is larger than the inner diameter D of the bearing assembly groove 204, the bearing retainer 300 is forcibly pressed into the bearing assembly groove 204. do.

In the process of forcibly press-fitting the bearing retainer 300 into the bearing assembly groove 204, the inclined extension part 306 forcibly enters the bearing assembly groove 204 having a small diameter, and is further elastically bent in the opposite direction of the press fitting. Thus, the inclined extension portion 306 has elastic restoring force.

Therefore, the bearing retainer 300 is press-fitted until its base plate 302 pushes the outer ring 164 of the bearing 160 until the stopper ring 168 comes into close contact with the inner end face of the bearing assembly groove 204. Subsequently, the inner surface of the bearing assembly hole 204 is elastically pressurized by a force in which the distal end portion of the inclined extension 304 extends radially outward by the elastic restoring force of the inclined extension 304. As such, when the inclined extension 304 has a force extended by the elastic restoring force, the front end of the inclined extension 304 is held while pressing the inner surface of the bearing assembly hole 204 to maintain a firmly coupled and fixed state. Accordingly, axial flow or separation of the outer ring 164 of the bearing 160 can be easily prevented.

In one embodiment, the relief hole 304 of the bearing retainer 300 consists of a regular hexagonal hole. In the case of a regular hexagonal hole, the stress or load is smoothly distributed during the indentation process and the holding force can be maintained uniformly and firmly. However, the relief hole 304 is not limited to one regular hexagon, but may be configured, for example, in an octagonal shape or a circular shape.

The bearing retainer 300 is preferably composed of any one of a phosphor bronze plate, a hard steel plate, a spring steel plate, and a stainless steel plate in order to maintain elasticity and enable bending. .

5 and 6 illustrate a process of assembling the oil seal 400 and the rotor shaft 120 to the base block 200.

First, as shown in FIG. 5, after assembling the bearing 160 and the bearing retainer 300 to the base block 200, the oil seal 400 is inserted into the expansion hole 206.

When the oil seal 400 is inserted, the state as shown in FIG.

In FIG. 6, in the assembled state to the oil seal 400, the rotor shaft 120 is pushed forward from the rear to pass through the oil seal 400, and then press-fits into the inner ring 162 of the bearing 160.

As such, even if the rear portion of the bearing 160 is opened by the bearing assembly hole 204 and the expansion hole 206, the bearing retainer 160 can be fixed simply and firmly so that the bearing 160 does not leave the rear opening. The assembly of each part is also very easy as described above.

The foregoing is a description of certain preferred embodiments of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, .

100: yoke housing
110: permanent magnet
120: rotor shaft
130: amateur coil
140: commutator
150: bearing
160: Bearing
162: (bearing) inner ring
164: (bearing) paddle
166: ball bearing
168: (Bearing) Stopper Ring
200: base block
202: bearing insertion hole
204: Bearing Assembly Groove
206: expansion hole
300: Bearing Retainer
301: base plate
302: relief hole
304: relief hole
306: inclined extension

Claims (7)

delete delete delete delete A base block 200 coupled to the front of the yoke housing 100;
A bearing assembly groove (204) formed forward from the rear of the base block (200);
A bearing insertion hole 202 formed through the front end of the bearing assembly groove 204;
The rotor shaft 120 is pressed into the inner ring 162, the outer ring 164 is inserted into the bearing insertion hole 202, and the outer ring 164 is a stopper in close contact with the front inner surface of the bearing assembly groove 204. A bearing 160 to which the ring 168 is coupled such that the stopper ring 168 is in close contact with the front inner surface of the bearing assembly groove 204;
A bearing retainer 300 press-fitted into the bearing assembly groove 204 to push the outer ring 164 of the bearing 160 to prevent axial flow;
The bearing retainer 300,
A base plate 302 in which a relief hole 304 having a diameter larger than that of the inner ring 162 of the bearing 160 is formed at the center thereof;
At the outer circumference of the base plate 302 is bent inclined toward the opposite direction of the insertion direction with respect to the bearing assembly groove 204, the outer diameter (d) after bending is larger than the inner diameter (D) of the bearing assembly groove 204 An inclined extension 306 having a diameter,
When the inclined extension portion 306 is forcibly pressed into the bearing assembly groove 204, the inclined extension portion 304 is elastically bent further in the opposite direction to the indentation, and the elastic restoring force of the inclined extension portion 304 after the indentation is pressed. By elastically pressing the inner surface of the bearing assembly hole 204 with the force to extend the radially outer side of the inclined extension portion 304 by the support,
An expansion hole 206 is formed behind the bearing assembly groove 204 of the base block 200,
The motor, characterized in that the oil seal 400 is inserted into the expansion hole (206). The method of claim 5,
The relief hole (304) is characterized in that the motor consisting of a hole of the hexagon. The method of claim 5,
The bearing retainer (300) is a motor comprising any one of a phosphor bronze plate, a hard steel plate, a spring steel plate, and a stainless steel plate.

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