JPH0655372A - Bearing press-fitting method and device therefor - Google Patents

Abstract

PURPOSE:To support press-fitting load by a reaction receiving means on the outside surface of a housing regardless of the dispersion of the outside dimension of the housing. CONSTITUTION:After a housing is positioned by holding a fixed shaft 10 by a holding means 29, a reaction receiving means 39 in constant contact with the slant face 32a of a wedge 32 is brought into contact with the outside surface of the housing 1 by sliding the wedge 32 by a cylinder device 31a. The back face of the reaction receiving means 39 is connected to a stand 30 through the wedge 32. The press-fitting load at the time of press-fitting metals 5, 6 into the housing is supported by the reaction receiving means 39 on the outer surface of the housing 1. The housing 1 is thereby supported always appropriately by the reaction receiving means 39 so as to heighten press-fitting accuracy. Also, since the reaction receiving means 39 is automatically brought into contact with the outside surface of the housing 1, press-fitting work can be automated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing press-fitting method,
In particular, it relates to a technique for receiving a reaction force when the bearing is press-fitted into the bearing housing, and for example, a process of assembling a bearing metal or a ball bearing to a gear housing in various rotary drive devices mounted on a motorcycle or an automobile Related to effective technology.

[0002]

2. Description of the Related Art Generally, various electric components are mounted on motorcycles and automobiles, and a motor with a worm speed reducer is used to drive these electric components. In this motor with a worm speed reducer, two bearing metals for rotatably supporting the worm shaft are arranged on the same axis of the gear housing and fixed by press fitting.

Conventionally, as a method of press-fitting two bearing metals into such a bearing housing, there is the following method.

First, the press-fitting hole into which the first bearing metal is press-fitted, and the second diameter whose outer diameter is slightly smaller than the outer diameter of the first bearing metal.
A press-fitting hole into which the bearing metal is press-fitted is formed on the same axis of the bearing housing. On the other hand, the first bearing metal and the second bearing metal are fitted to the outer circumference of a press-fitting jig formed in a rod shape. Then, the press-fitting jig is inserted into the press-fitting hole and the press-fitting hole of the bearing housing from the press-fitting hole side along the axis line with the second bearing metal fitting side first. With this insertion, the first bearing metal is press-fitted into the press-fitting hole and the second bearing metal is press-fitted into the press-fitting hole in one stroke.

In this conventional bearing press-fitting method, the press-fitting of the first bearing metal into the press-fitting hole and the press-fitting of the second bearing metal into the press-fitting hole start and end at the same time. ing. Therefore, the bearing housing needs to be accurately positioned with respect to the stroke of the press fitting jig.

On the other hand, since the bearing housing is integrally molded by aluminum die casting, the outer dimensions of the bearing housing vary from one molded product to another. Therefore, if the reaction force receiver is directly contacted with the outer surface of the bearing housing to receive the press-fitting load by the press-fitting jig, the bearing housing can be accurately positioned with respect to the stroke of the press-fitting jig. Can not.

Therefore, conventionally, after the bearing housing, which is the work of the bearing press-fitting method, is mounted on the jig dedicated to the bearing press-fitting work, the position adjustment work corresponding to the dimensional variation of each product is manually performed by the operator. Since the reaction force receiver is brought into contact with the outer surface of the dedicated jig, the reaction force against the press-fitting load and the positional accuracy of the bearing housing with respect to the stroke of the press-fitting jig are ensured.

[0008]

However, in the conventional bearing press-fitting method, there is a problem that the work efficiency is lowered and the bearing press-fitting method cannot be automated because position adjustment work by an operator is involved.

It is an object of the present invention to provide a bearing press-fitting technique capable of absorbing the dimensional variation of the bearing housing and always supporting the bearing housing in a constant state.

[0010]

A bearing press-fitting method according to the present invention is a bearing press-fitting method in which a bearing is press-fitted into a female part of a bearing housing from one direction, and after the bearing housing is positioned, a reaction force receiver Is moved and abutted at a position on the extension line of the bearing press-fitting direction on the outer surface of the bearing housing in a direction opposite to the direction of the press-fitting direction, and the reaction force receiving member is provided on the bearing housing abutment surface and the reaction force side. It is characterized in that it is connected to the fixed structure so as to obtain a reaction force.

[0011]

According to the above-mentioned means, even if a gap is generated between the outer surface of the bearing housing and the reaction force receiving member after the positioning of the bearing housing due to the variation of the outer dimensions of the bearing housing, the reaction force receiving member. By moving in the direction of eliminating the gap, the abuts against the outer surface of the bearing housing. Therefore, the variation of the outer dimensions is automatically absorbed by the movement of the reaction force receiving device for each bearing housing.

Since the reaction force receiving member is always in contact with the outer surface of the bearing housing in this way, the load acting on the bearing housing when the bearing is pressed into the bearing housing is directly contacted with the bearing housing. It will be properly supported by the reaction force receiver. Therefore, the bearing is properly pressed into the bearing housing.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a front sectional view for explaining the operation of a main part of a bearing press-fitting device according to an embodiment of the present invention, FIG. 2 is a partially cut front view showing the whole, and FIG. FIG. 4 is a partially cut front view showing a holding device, FIG. 4 is a partially cut front view showing a press-fitting jig guiding device and a driving device, FIG. 5 is a partially cut front view showing a main part of a work holding device, and FIG. FIG. 7 is a front sectional view showing a main part of the jig guiding device, and FIG. 7 is a diagram for explaining the operation. 8A and 8B are views showing a work. FIG. 8A is a front sectional view, FIG. 8B is a side view, and FIG. 8C is a plan view.

In the present embodiment, the bearing press-fitting device according to the present invention rotatably supports the worm shaft in the gear housing (hereinafter referred to as housing) of the motor with the worm speed reducer for driving the electric components of the automobile. The two metal bearings (hereinafter referred to as "metals") are each press-fitted in one stroke to perform a metal press-fitting method.

The housing according to this embodiment is constructed as shown in FIG. The housing 1 is provided with a main body 2 integrally formed by an aluminum die casting method, and the main body 2 is formed in a box shape having a substantially rectangular upper surface with an open upper surface. A pair of side wall portions located on the short sides of the main body 2 are provided with a press-fitting hole 3 as a first female part and a press-fitting hole 4 as a second female part arranged on the same axis, respectively. A first metal 5 is press-fitted in 3 and a second metal 6 is press-fitted in the press-fitting hole 4.

The press-fitting hole 3 is formed in a hollow cylindrical shape with both ends open, and its inner diameter is set to be equal to the outer diameter of the first metal 5. Press-fit hole 4 is press-fit hole 3
One side (hereinafter, referred to as the right end) on the side is opened and the left end is closed to form a hollow cylindrical shape. The inner diameter of the press-fitting hole 4 is set to be equal to the outer diameter of the second metal 6 and smaller than the inner diameter of the press-fitting hole 3. Therefore, the outer diameter of the first metal 5 is set to be larger than the outer diameter of the second metal 6.

In the present embodiment, the distance L ₂ from the right end which is the inlet side end of the press-fitting hole 3 to the right end which is the inlet side end of the press-fitting hole 4 is fitted to the press-fitting jig described later. The distance L from the left end, which is the press-fitting side end of the first metal 5, to the left end, which is the press-fitting side end of the second metal 6.
₁ to about 1/2 to 1/5 of the length of the first metal 5,
It is set to be long.

It should be noted that the circular hollow chamber formed between the press-fitting hole 3 and the press-fitting hole 4 of the housing body 2 constitutes a storage chamber 7 for storing a worm wheel (not shown). In addition, the press-fitting hole 3 in the housing body 2
A mounting portion 8 for connecting a motor (not shown) is formed on the right side of the. Further, a vertical press-fitting hole 9 is formed in the opening surface of the housing body 2 so as to extend at a right angle to the axis of the press-fitting hole 3 and the press-fitting hole 4, and the vertical press-fitting hole 9 has a fixed shaft described later. 10 is press-fitted. Then, the vertical press-fitting hole 9 and the press-fitting hole 3,
Since the press-fitting hole 4 is accurately manufactured within a predetermined tolerance range, it will be used as a reference position for metal press-fitting work.

Next, the structure of the metal press-fitting apparatus, which is an embodiment of the present invention for carrying out the method of press-fitting the first metal 5 and the second metal 6 into the housing 1 according to the above-mentioned structure, will be described.

The metal press-fitting device 20 according to the present embodiment is installed in a part of the line of the conveyor 21 where the assembly work of the motor with the worm speed reducer is carried out, and is installed along the line of the conveyor 21. Machine base 22
Is equipped with. The machine base 22 is provided with a work holding device that holds a housing (hereinafter, also referred to as a work) as a work, a press-fitting jig guide device, and a press-fitting jig drive device.

The work holding device 23 is a lower cylinder device 2 for holding the housing 1 as a work from below.
4, the lower cylinder device 24 is installed vertically above the conveyor 21 on the machine base 22 in the vertical direction. A holding table 25 is disposed directly above the lower cylinder device 24 on the conveyor 21, and the holding table 25 holds the work 1 lifted from the conveyor 21 when the lower cylinder device 24 extends. It is supposed to do. In addition, the holding table 25 and the cylinder device 24
A pedestal 26 is interposed between and, so that a load acting downward on the housing 1 can be supported by the pedestal 26 during metal press-fitting work.

An upper cylinder device 28 for holding a work from the upper side is arranged vertically downward just above the lower cylinder device 24, and the upper cylinder device 28 is fixed to a guide rail 42 described later. It is mounted on the bracket 27. A holder 29 is fixedly connected to the lower end of the piston rod 28 a of the upper cylinder device 28, and the holder 29 is attached to the vertical press-fitting hole 9 of the housing 1.
It is configured so that it can be fitted from above onto a fixed shaft 10 that is press-fitted into and vertically erected.

A left stand 30 is vertically erected at one end (hereinafter, left end) on the machine base 22, and a wedge driving cylinder device 31 is vertically installed at an upper end of the stand 30. It is installed downwards.
A wedge 32 is connected to the lower end of the piston rod 31a of the cylinder device 31 so as to move integrally.

Although not described in detail and shown in the drawings, the wedge drive cylinder device 31 is provided with a brake device, which is installed in the air pressure supply / discharge circuit and is automatically operated by back pressure. Control valve, and a piston gripping device operated by the control valve. Then, the wedge drive cylinder device 31 is shortened by the force from the load side.
It is designed to be prevented by this brake device.

The wedge 32 is formed in a rectangular plate shape having a slope 32a on one main surface, and the main surface 32b on the other side is the right side surface of the stand 30 with the slope 32a facing the work 1 side. Is in sliding contact with. In this embodiment, the slope 32a of the wedge 32 is inclined by 5 degrees with respect to the parallel surface 32b on the opposite side.

On the right side surface of the stand 30, four parallel pins 33 are arranged in parallel with each other and are planted at right angles.
Each parallel pin 33 is in sliding contact with both side surfaces of the wedge 32. By the guide of the parallel pin 33 and the stand 30,
The wedge 32 is configured to slide in the vertical direction as the cylinder device 31 expands and contracts.

A stopper 34 is installed on the right side surface of the stand 30 so that its position can be adjusted.
4 is arranged such that its upper end surface faces the lower end surface of the wedge 32. Therefore, the lower limit position of the wedge 32 is restricted by the stopper 34.

A bush 35 is inserted in the left-right direction at the mounting position of the wedge 32 in the stand 30, and a guide rod 36 is inserted in the bush 35 in the left-right direction and slidably supported. A spring seat 37 is provided on the left end of the guide rod 36, and a spring 38 is provided on the outer periphery of the guide rod 36.
7 and the bush 35 are inserted and installed in a state of energy accumulation. Therefore, the guide rod 36 is always biased leftward by the spring 38.

The right end portion of the guide rod 36 is a guide hole 3 formed in the central portion of the wedge 32 so as to extend vertically.
2c, and the reaction force receiving device 39 is provided at the right end thereof.
Are fixed so that they are orthogonal to each other. The reaction force receiving device 39 is arranged so as to face the work 1, and the left end face on the side opposite to the work facing face is slidably brought into contact with the slope 32 a of the wedge 32. At this time, since the guide rod 36 is constantly biased to the left by the spring 38, the reaction force receiving device 39 is constantly pressed against the slope 32a of the wedge 32 by the biasing force of the spring 38. .

A right stand 40 is vertically erected on the right end of the machine base 22, and a press-fitting jig guide device 41 is provided between the left stand 30 and the right stand 40. Between the left and right stands 30 and 40, four guide rails 42 are arranged in the front and rear up and down positions and are installed in the left and right direction. The lower two guide rails 42,
A moving block 44 is slidably supported on the left and right sides of the guide rail 42.
The right limit position is restricted by the stopper 43 fixed to 2.

Work 1 on top of moving block 44
A press-fitting jig holder 46 is rotatably supported by a support shaft 45 horizontally extending in the front-rear direction at a horizontal position opposed to the holder 46. The holder 46 is a drive device (not shown) such as an electric motor or an air motor. It is adapted to be reciprocally rotated by (No.).

A vertical stopper 47 is provided at the left end of the moving block 44 so as to project rightward in the water direction. The vertical stopper 47 is provided at the lower end of the press-fitting jig holder 46 when it is in a vertical state. By abutting, the vertical position of the holder 46 is regulated.

Further, a horizontal stopper 48 is vertically projectingly provided on the upper right end portion of the moving block 44, and the horizontal stopper 48 is provided at the right end when the press-fitting jig holder 46 becomes horizontal. By abutting on the upper surface of the part, the horizontal position of the holder 46 is regulated.

Further, a shock absorber 49 is installed vertically downward on the left side of the horizontal stopper 48 of the moving block 44. The shock absorber 49 comes into contact with the upper surface of the right end portion of the holder 46 when the press-fitting jig holder 46 shifts from the vertical state to the horizontal state, and absorbs the impact.

A press-fitting jig 50 is attached to the press-fitting jig holder 46.
In the vertical state of the holder 46, one end of the holder 46 is fitted and retained in a press-fitting jig mounting hole 46a formed in the upper end surface thereof.

The press-fitting jig 50 is formed in a slender multi-stage cylindrical shape, and a vacuum suction port 51 is formed concentrically on the outer end face with respect to the insertion thereof. The opened negative pressure supply path 52a is connected. The negative pressure supply passage 52a is connected to the negative pressure supply port 52b opened in the holder 46. Then, a negative pressure supply hose (not shown) is connected to the negative pressure supply port 52b, and a vacuum pump (not shown) is provided via this hose, the supply port 52b and the supply path 52a.
The thrust bearing metal (hereinafter referred to as thrust metal) 11 is vacuum-held at the vacuum suction port 51.

A first holding portion 53 for holding the first metal 5 is formed in the middle of the press-fitting jig 50. The outer diameter of the first holding portion 53 is set to be equal to the inner diameter of the first metal 5, and the first metal 5 is fitted to the outer periphery of the first holding portion 53 so that the first metal 5 is detachably held. It has become.

A second holding portion 54 for holding the second metal 6 is formed at the tip of the press-fitting jig 50. The outer diameter of the second holding portion 54 is set to be equal to the inner diameter of the second metal 6, and the second metal 6 is fitted to the outer periphery of the second holding portion 54 so that the second metal 6 is detachably held. It has become.

Then, the first metal 5 is held by the first holding portion 53 and the second holding portion 54, respectively.
The length of the tip distance L ₁ between the end of the (previous end of the side to be pressed into) the second metal 6, than the distance L ₂ between the press-fit hole 4 and press-fitting hole 3 described above, the first metal 5 It is about 1/2 to 1/5 longer. In other words, the fitting positional relationship between the first holding portion 53 and the second holding portion 54 is set so that this condition is created.

A press-fitting jig driving device 60 is installed on the right stand 40. That is, the right side stand 4
At 0, a press-fitting cylinder device 61 is installed horizontally leftward, and the press-fitting cylinder device 61 pushes the moving block 44 leftward via a load cell. Four bushes 62 are fixed to the right stand 40 so as to extend in the left-right direction at the front and rear up and down positions.
Is inserted and is slidably supported in the left-right direction.

The left end of each guide rod 63 is fixed to a plate 64, and a load cell 65 is fixed to the center of the plate 64. The load cell 65 is configured to detect a peak value of a press-fitting load, which will be described later, based on a command from each limit switch (not shown) arranged along the guide rail 42.

At the position below the press-fitting cylinder device 61 on the right side stand 40, a returning cylinder device 66 is installed horizontally leftward.
The piston rod 66 a of No. 6 is connected to the moving block 44 by a bracket 67.

Next, the operation of the metal press-fitting device having the above structure will be described to explain the metal press-fitting method which is an embodiment of the present invention.

The housing 1 as the work of the metal press-fitting device 20 is conveyed to the position of the metal press-fitting device 20 while being placed on the conveyor 21. In the work 1, the press-fitting hole 3 is directed to the right side, the press-fitting hole 4 is directed to the left side, and the fixed shaft 10 press-fitted in the vertical press-fitting hole 9 is directed upward.

The work 1 is lifted from the conveyor 21 by the lower cylinder device 24 on the machine base 22, and the fixed shaft 10 is held by the holder 29 of the upper cylinder device 28 installed on the guide rail 42. . Since the vertical press-fitting hole 9 to which the fixed shaft 10 is fixed is formed with high accuracy, when the fixed shaft 10 is held by the holder 29, the work 1 is in a state where the predetermined positioning is secured.

In this state, the wedge driving cylinder device 31 is extended and the wedge 32 is lowered. As the wedge 32 descends, the reaction force receiver 39, which is constantly in contact with the slope 32a of the wedge 32 by the urging force of the spring 38 via the rod 36, is pushed rightward according to the inclination of the slope 32a. . Then, when the reaction force receiver 39 is brought into contact with the left end surface of the work 1 with its right side plane, the reaction force receiver 39
Is regulated in position by the workpiece 1 positioned and held by the holder 29, so that the extension operation of the wedge drive cylinder device 31 is automatically stopped by the brake device.

Therefore, the work 1 positioned on the basis of the fixed shaft 10 is moved by the reaction force receiving member 39 regardless of the dimension variation of the housing side wall in the axial direction (left-right direction) connecting the press-fitting holes 3 and 4. You will be able to receive a reaction force receiving surface that resists press fitting. In other words, the reaction force receiving device 39 adjusts the vertical position of the wedge 32 to absorb the dimensional variation in the left-right direction such as the wall thickness of the housing side wall, which is usually present, so that the reaction force receiving surface of the work 1 is always appropriate. It will create a condition that will be received by.

On the other hand, in the press-fitting jig guide device 41,
The first metal 5, the second metal 6, and the thrust metal 11 are mounted on the press-fitting jig 50. That is, the press-fitting jig 50
In a state in which the first metal 5 is maintained vertically, the first metal 5 is conveyed to the press-fitting jig 50 by a parts feeder (not shown) and lowered, so that the first metal 5 is fitted and mounted on the outer periphery of the first holding portion 53. It Similarly, the second metal 6 is conveyed to the press-fitting jig 50 by a parts feeder (not shown) and lowered, so that the second metal 6 is fitted and mounted on the outer periphery of the second holding portion 54.

Subsequently, the thrust metal 11 is transferred to the press-fitting jig 50 by a parts feeder (not shown) and lowered, so that the thrust metal 11 is placed on the vacuum suction port 51. The thrust metal 11 placed on the vacuum suction port 51 has a negative pressure supply path 52a and a negative pressure supply port 52b on the vacuum suction port 51.
When a negative pressure is supplied by the vacuum suction port 51, it is vacuum-sucked by the vacuum suction port 51 and held by the press-fitting jig 50. Then, when the thrust metal 11 is held by vacuum suction, the second
The metal 6 is securely held by the press-fitting jig 50 via the thrust metal 11.

When the first metal 5, the second metal 6 and the thrust metal 11 are mounted on the press-fitting jig 50, the press-fitting jig holder 46 is rotated 90 degrees by a driving device (not shown), and the press-fitting jig is moved. 50 is tilted horizontally to the left. At the time of this rotation operation, the right end portion of the press-fitting jig holder 46 in the horizontal state is buffered by the shock absorber 49.
First metal 5 and second metal 6 mounted on the press-fitting jig 50
And the thrust metal 11 may fall off due to impact,
It is prevented from idling.

When the press-fitting jig 50 is tilted horizontally, the press-fitting jig driving cylinder device 61 is extended and the moving block 44 is slid leftward in the horizontal direction along the guide rail 42 via the load cell 65. . At this time, the piston rod 66a of the returning cylinder device 66 is also extended.

The moving block 44 is the press-fitting cylinder device 6
When the press-fitting jig 50 is moved leftward by 1, the press-fitting jig 50, which is horizontally leftward, is advanced toward the work 1 and sequentially inserted into the press-fitting hole 3 and the press-fitting hole 4. At this time, the second metal 6 fitted to the left end which is the insertion tip side of the press-fitting jig 50 has a press-fitting hole 3 whose outer diameter is located on the right side of the work 1.
Since it is formed to have a smaller diameter than the inner diameter of, it will pass through the press-fitting hole 3.

As the press-fitting jig 50 advances, the second metal 6
When the first metal 5 reaches the right end of the press-fitting hole 3 after passing through the press-fitting hole 3, press-fitting of the first metal 5 into the press-fitting hole 3 is started. Then, when the press-fitting of the first metal 5 into the press-fitting hole 3 progresses about 1/2 to 1/5 of the length of the first metal 5, a limit switch (not shown) is actuated to press-fit the load. Is detected by the load cell 65.

On the other hand, the relationship between the mounting positions of the first metal 5 and the second metal 6 of the press-fitting jig 50 and the positions of the press-fitting holes 3 and 4 of the work 1 is L ₁ > L ₂ ,
Since the relationship is set to, the press-fitting hole 3 of the first metal 5
At the start of press-fitting into, the press-fitting of the second metal 6 into the press-fitting hole 4 is not started. Then, when the press-fitting load of the first metal 5 into the press-fitting hole 3 exceeds the peak value, the press-fitting of the second metal 6 into the press-fitting hole 4 is started.

Then, as the press-fitting jig 50 advances to the work 1, the remaining press-fitting process of the first metal 5 into the press-fitting hole 3 and the press-fitting process of the second metal 6 into the press-fitting hole 4 are simultaneously performed. proceed. Then, the peak value of the total press-fitting load in both the press-fitting holes 3 and the press-fitting holes 4 of the first metal 5 and the second metal 6 is actuated by the limit switch (not shown), whereby the load cell 65 Detected by.

Thereafter, the press-fitting of the first metal 5 into the press-fitting hole 3 and the press-fitting of the second metal 6 into the press-fitting hole 4 are simultaneously completed. The end point of this is detected by a limit switch (not shown), and the extension operation of the press-fitting cylinder device 61 is stopped.

Here, FIG. 7 shows the relationship between the load when the first metal 5 is press-fitted into the press-fitting hole 3 and the load when the second metal 6 is press-fitted into the press-fitting hole 4, and the stroke of the press-fitting jig 50. It is a diagram showing.

In FIG. 7, the vertical axis represents the load, a is the thrust of the returning cylinder device 66 of the press-fitting jig 50 (about 5 kg), and b is the press-fitting load when the first metal 5 is press-fitted to 2 mm. (About 30 kg), c is a press-fitting load (about 150 kg) when the first metal 5 and the second metal 6 are press-fitted, and d is a thrust force (about 800 kg) of the press-fitting cylinder device 61. Here, specific numerical values are reference examples for facilitating understanding of the proportional relationship of loads.

Further, the stroke of the press-fitting jig 50 is taken along the horizontal axis, A is the press-fitting start point of the first metal 5, B is the press-fitting load determination timing of the first metal 5, and B'is the second metal. 6 is a press-fitting start point, C is a press-fitting load determination timing of the first metal 5 and the second metal 6, and C ′ is a fixed-size press-fitting end (jig abutment) point. The press-fit load is measured as a peak value, and the load peak values between OB and OC are measured.

In FIG. 7, the solid curve 12 shows the load-stroke characteristic in the case of a non-defective product, and the case where the load between the strokes B and C'is in the range of b to c is judged as a non-defective product.

On the other hand, the broken line curve 13 shows the load-stroke characteristic when the first metal 5 is not provided. In this case, the load in the range of stroke B'-C 'is outside the range of b-c. Therefore, in this case, the product is determined to be defective. The case where the first metal 5 is not present corresponds to the case where the press-fitting of the first metal 5 into the press-fitting hole 3 is too slow.

The alternate long and short dash line curve 14 shows the load-stroke characteristic when the second metal 6 is not provided. In this case, the load in the range of stroke B'-C 'is outside the range of b-c. Therefore, in this case, the product is determined to be defective. And the second metal 6
The case where there is no pressure corresponds to the case where the press-fitting of the second metal 6 into the press-fitting hole 4 is too slow.

When the first metal 5 and the second metal 6 are sequentially press-fitted into the press-fitting hole 3 and the press-fitting hole 4 of the housing 1 as described above, the reaction force receiver 39 of the housing 1 is attached to the left end surface of the housing 1. The reaction force of the press-fitting load by the press-fitting jig 50 is always properly obtained by the reaction force receiving member 39 because the side wall is always in contact regardless of the dimensional variation of the side wall. That is, since the reaction force receiver 39 absorbs the dimensional error of the side wall of the housing 1 by the wedge 32 and is in contact with the right side surface of the stand 30 at a right angle, a sufficient reaction force is exerted even if the press-fitting load is large. You can ask the stand 30.

At this time, since the slope 32a of the wedge 32 is set to 5 degrees, the component force in the vertical direction due to the press-fitting load, that is, the component force for letting the wedge 32 escape upward, is generated. The friction force due to the direct pressure on the stand 30 is not overcome. Therefore, although the wedge 32 is interposed between the reaction force receiver 39 and the stand 30, the reaction force receiver 39 can sufficiently support a large pressure load.

As described above, after the first metal 5 and the second metal 6 are press-fitted into the press-fitting hole 3 and the press-fitting hole 4 of the housing 1, the press-fitting cylinder device 61 is shortened. Further, the returning cylinder device 66 is shortened and the moving block 44 is retracted with respect to the work 1 together with the load cell 65. When the moving block 44 comes into contact with the stopper 43, the retreat is restricted.

Since the first metal 5 and the second metal 6 are press-fitted in the press-fitting hole 3 and the press-fitting hole 4 of the housing 1, the press-fitting jig 50 moves the first metal 5 and the second metal 6 together. And it is pulled out from the second metal 6 and retracted together with the holder 46.

With the press-fitting jig 50 pulled out, the first metal 5 is press-fitted into the press-fitting hole 3 of the housing 1 and the second metal 6 is press-fitted into the press-fitting hole 4.
Further, the thrust metal 11 is left in the bottom of the press-fitting hole 4 into which the second metal 6 is press-fitted.

When the above press-fitting work is completed, the upper cylinder device 28 is shortened and the holder 29 is pulled out from the fixed shaft 10. Further, the lower cylinder device 24 is shortened and the work 1 is placed on the conveyor 21. Next, the conveyor 21 is intermittently fed and the work 1 is conveyed to the next step. After that, by repeating the above operation, the first metal 5 and the second metal
The metal 6 press-fitting work is carried out sequentially.

According to the above embodiment, the following effects can be obtained. By detecting the peak value of the press-fitting load of the first metal 5 into the press-fitting hole 3, it is possible to obtain the pull-out load of the first metal 5 from the press-fitting hole 3 after press-fitting. It is possible to omit a dedicated measuring step for the pull-out load.

By detecting the peak value of the total press-fitting load of the second metal 6 and the first metal 5 after the press-fitting of the first metal 5, the pull-out load of the second metal 6 from the press-fitting hole 4 after the press-fitting is detected. Therefore, it is possible to omit a dedicated measuring step for the off-line pull-out load after the press-fitting work.

By the above and, it is possible to improve the workability of the entire manufacturing process of the motor with the worm speed reducer.

When the pressure jig 50 press-fits the first metal 5 and the second metal 6 into the housing 1, the press-fitting load of the press-fitting jig 50 can be properly received by the reaction force receiving member 39. The work of press-fitting the first metal 5 and the second metal 6 into the housing 1 by 50 can be properly performed.

By changing and adjusting the position of the reaction force receiver 39 with respect to the work 1 by the wedge 32, the work 1
Since the dimensional variation of the side wall in the press-fitting direction can be absorbed, the press-fitting load of the work 1 can always be supported constantly regardless of the dimensional variation due to the processing dimensional error of the work 1 and the press-fitting accuracy is always constant. Can be maintained at the same time, and the press-fitting accuracy can be improved.

It is needless to say that the present invention is not limited to the above-mentioned embodiment, and various modifications can be made without departing from the scope of the invention.

For example, the press-fitting jig guide device is not limited to the structure of the above-described embodiment, and the first metal and the second metal can be mounted on the press-fitting jig while the press-fitting jig is in the horizontal state. You may comprise.

The press-fitting jig driving device is not limited to be configured such that the press-fitting process and the returning process are performed by the separate cylinder devices, but may be configured to be performed by the dual-purpose cylinder device.

The detection of the press-fitting load value is not limited to be executed by the load cell provided between the press-fitting jig and the press-fitting cylinder device, but may be a pressure gauge incorporated in the press-fitting cylinder device. It may be configured to be performed by.

In the above embodiment, the case where the bearing metal which is a slide bearing is press-fitted has been described, but the bearing which is press-fitted may be a ball bearing or a roller bearing which is a rolling bearing.

Further, in the above embodiment, the case where the bearings for rotatably supporting both ends of the worm shaft are press-fitted into the gear housing in the motor with the worm speed reducer has been described, but the present invention is not limited to this. Instead, the present invention can be applied to general bearing press-fitting technology in which two bearings are press-fitted coaxially with the bearing housing.

[0080]

As described above, according to the present invention,
Since the reaction force receiver absorbs variations in external dimensions and always automatically contacts the outer surface of the bearing housing, the load acting on the bearing housing during press fitting of the bearing can be properly supported. It can be maintained constant and the press-fitting accuracy can be improved. Further, since it is possible to omit the manual position adjustment work by the operator after mounting the dedicated jig for the bearing housing, it is possible to improve the work efficiency and realize the automation of the bearing press-fitting work.

[Brief description of drawings]

FIG. 1 is a front cross-sectional view for explaining an operation of a main part of a bearing press-fitting device that is an embodiment of the present invention.

FIG. 2 is a partially cut front view showing the whole thereof.

FIG. 3 is a partially cut front view showing the work holding device.

FIG. 4 is a partially cut front view showing a press-fitting jig guide device and a drive device.

FIG. 5 is a partially cut front view showing a main part of the work holding device.

FIG. 6 is a front sectional view showing a main part of a press-fitting jig guide device.

FIG. 7 is a diagram for explaining the operation.

FIG. 8 is a view showing a work, (a) is a front sectional view,
(B) is a side view and (c) is a plan view.

[Explanation of symbols]

1 ... Housing, 2 ... Main body, 3 ... Press-fitting hole (first female portion),
4 ... press-fitting hole (second female part), 5 ... first metal (first bearing), 6 ... second metal (second bearing), 7 ... worm wheel accommodating chamber, 8 ... motor mounting part, 9 ... vertical press-fitting Holes, 10
… Fixed shaft, 20… Metal press-fitting device (bearing press-fitting device), 2
1 ... Conveyor, 22 ... Machine stand, 23 ... Work holding device, 2
4 ... Lower cylinder device, 25 ... Holding base, 26 ... Receiving base,
27 ... Bracket, 28 ... Upper cylinder device, 28a ...
Piston rod, 29 ... Retainer, 30 ... Left stand,
31 ... Wedge driving cylinder device, 31a ... Piston rod, 32 ... Wedge, 32a ... Slope, 32b ... Parallel, 32c ...
Guide hole, 33 ... Parallel pin, 34 ... Stopper, 35 ... Bushing, 36 ... Guide rod, 37 ... Spring seat, 38 ... Spring, 39 ... Reaction force receiver, 40 ... Right stand, 41 ... Press-fitting jig guide device, 42 ... Guide rail, 43 ... Stopper, 44 ... Moving block, 45 ... Spindle, 46 ... Press-fitting jig holder, 46a ... Press-fitting jig mounting hole,
47 ... Vertical stopper, 48 ... Horizontal stopper, 49 ...
Shock absorber, 50 ... Press-fitting jig, 51 ... Vacuum suction port, 52a ... Negative pressure supply path, 52b ... Negative pressure supply port, 53 ...
1st holding part, 54 ... 2nd holding part, 60 ... press fitting jig drive device, 61 ... press fitting cylinder device, 62 ... bush, 63
… Guide rod, 64… Plate, 65… Load cell,
66 ... Return cylinder device, 66a ... Piston rod,
67 ... Bracket.

Claims (2)

[Claims] 1. A bearing press-fitting method in which a bearing is press-fitted into a female part of a bearing housing from one direction, wherein after the bearing housing is positioned, a reaction force receiver is provided on an extension line of the bearing press-fitting direction on an outer surface of the bearing housing. Is moved to the position opposite to the direction of the press-fitting direction and abutted, and this reaction force receiver is connected to the bearing housing contact surface and the fixed structure on the reaction side so as to obtain a reaction force. A method for press-fitting a bearing, which is characterized in that 2. A bearing press-fitting device for carrying out the bearing press-fitting method according to claim 1, wherein a work holding device for positioning and holding the bearing housing, and a press-fitting jig on which the bearing is mounted are press-fitted. A press-fitting jig driving device that is moved in a direction, and a slidable structure that is orthogonal to the press-fitting direction extension line on a fixed structure that is fixed to one side of the work holding device on the side opposite to the press-fitting jig driving device. A wedge that is in contact with the wedge and is configured to adjust its position in the orthogonal direction, and a reaction force receiver that is always in contact with the wedge and is in contact with the outer surface of the bearing housing by the position of the wedge. And a bearing press-fitting device.