JP3201839B2 - Bearing press-fitting method and device - Google Patents

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, the present invention relates to an improvement in technology for simultaneously press-fitting two bearings into a housing. For example, the technology is used for assembling a bearing metal or a ball bearing to a gear housing in various rotary driving devices mounted on a motorcycle or an automobile. Effective technology.

[0002]

2. Description of the Related Art In general, motorcycles and automobiles are equipped with various electric components, 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.

[0003] As a bearing press-fitting method for press-fitting two bearing metals into such a bearing housing, there is conventionally the following method.

[0004] First, a press-fit hole into which the first bearing metal is press-fitted, and a second press-fitting hole whose outer diameter is slightly smaller than the outer diameter of the first bearing metal.
A press-fit 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 respectively fitted to the outer periphery of the rod-shaped press-fitting jig. The press-fitting jig is inserted into the press-fit hole of the bearing housing and the press-fit hole along the axis from the press-fit hole side with the second bearing metal fitting side first. With this insertion, the first bearing metal is pressed into the press-fitting hole and the second bearing metal is pressed 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.

[0006]

However, in the conventional bearing press-fitting method described above, when assuring the detachment load of the first bearing metal and the detachment load of the second bearing metal separately, the load used for the press-fitting is reduced. However, there is a disadvantage that an off-line sampling inspection or 100% inspection process is required.

That is, in the above-described bearing press-fitting method, since the press-fitting of the first bearing metal and the second bearing metal starts and ends at the same time, the load value used for press-fitting the two bearing metals is measured. However, the measured load value is the total value of the loads simultaneously used for press-fitting both bearing metals, and is the load value used for press-fitting the first bearing metal and the load value used for press-fitting the second bearing metal. Each of the applied load values cannot be known.

[0008] For example, when the press-fitting of the first bearing metal press-fitted with a small load is too slow, the load value used for press-fitting the first bearing metal is the second bearing metal press-fitted with a large load. Is included in the range of the error of the load value of the first bearing metal. Even if the total load value measured at this time is reduced by the amount by which the press-fit of the first bearing metal is excessively loose, the range of the error It is overlooked as inside.

An object of the present invention is to provide a bearing press-fitting method capable of separately recognizing a press-fit load of a first bearing and a press-fit load of a second bearing.

[0010]

According to the present invention, there is provided a bearing press-fitting method comprising: a first female portion into which a first bearing is press-fitted; and a second bearing having an outer diameter slightly smaller than the outer diameter of the first bearing. A second female part is formed on the same axis line of the bearing housing, and the first bearing and the second bearing are respectively fitted on the outer periphery of a rod-shaped press-fitting jig. Are provided on the first female portion and the second female portion of the bearing housing.
By inserting along the axis from the first female portion side with the bearing fitting side first, the first bearing is inserted into the first female portion and the second bearing is inserted into the second female portion in one stroke. In the bearing press-fitting method, the press-fitting of the second bearing into the second female portion is started from a point in time when the press-fitting of the first bearing into the first female portion has advanced to an intermediate position, and The press-fit end time of the first bearing into the portion and the press-fit end time of the second bearing into the second female portion substantially coincide with each other.

[0011]

According to the means described above, the press-fitting of the first bearing into the first female portion is started, and when the peak of the press-fitting has passed, the press-fitting of the second bearing into the second female portion is started. By detecting the peak value of the press-fitting load into the first female portion of the first bearing, the load coming off from the first female portion of the first bearing can be obtained.

After the peak value of the press-fit load into the first female portion of the first bearing is measured, the peak value of the total press-fit load into the first female portion and the second female portion of the first bearing and the second bearing is determined. By detecting, it is possible to estimate the peak value of the press-fit load to the second female portion of the second bearing. Then, from this peak value, it is possible to determine the load of the second bearing from the second female portion.

[0013]

FIG. 1 is a front sectional view for explaining the operation of a main part of a bearing press-fitting device according to one embodiment of the present invention, FIG. 2 is a partially cut front view showing the whole thereof, and FIG. 4 is a partially cut front view showing a holding device, FIG. 4 is a partially cut front view showing a press-in jig guide 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 guide device, and FIG. 7 is a diagram for explaining the operation. FIGS. 8A and 8B are views showing a workpiece, in which 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 a worm shaft on a gear housing (hereinafter referred to as a housing) of a motor having a worm speed reducer for driving electric components of an automobile. And a metal press-fitting method for press-fitting two bearing metals (hereinafter, referred to as metal) in one stroke.

The housing according to the present embodiment is configured as shown in FIG. The housing 1 includes a main body 2 integrally formed by an aluminum die-casting method. The main body 2 is formed in a box shape having an opening on a top surface which is substantially rectangular in plan view. In a pair of side wall portions located on the short side of the main body 2, a press-fit hole 3 as a first female portion and a press-fit hole 4 as a second female portion are respectively formed on the same axis and are opened. The first metal 5 is pressed into the press-fit hole 3 and the second metal 6 is pressed into the press-fit hole 4.

The press-fitting hole 3 is formed in a cylindrical hollow shape with both ends opened, 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 end (hereinafter referred to as the right end) of the side is open and the left end is formed in a cylindrical hollow shape closed. The inner diameter of the press-fit 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-fit 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 this embodiment, a 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 a press-fitting jig described later. The distance L from the left end, which is the tip of the first metal 5 on the press-fit side, to the left end, which is the tip of the second metal 6 on the press-fit side.
_{About 1/2} to 1/5 of the length of the first metal 5,
It is set to be long.

The accommodation chamber 7 for accommodating a worm wheel (not shown) is formed by a circular hollow chamber formed between the press-fit hole 3 and the press-fit hole 4 of the housing body 2. The press-fit 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 vehicle. Further, a vertical press-fitting hole 9 is formed on an opening surface of the housing body 2 so as to extend at right angles 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. The vertical press-fit hole 9 and the press-fit hole 3,
Since the press-fit hole 4 is manufactured with high precision within a predetermined tolerance range, it is used as a reference position in metal press-fitting work.

Next, the structure of a metal press-in device according to an embodiment of the present invention for performing the method of press-fitting the first metal 5 and the second metal 6 into the housing 1 according to the above configuration will be described.

The metal press-fitting device 20 according to the present embodiment is installed in a part of a line of a conveyor 21 on which an operation of assembling a motor with a worm speed reducer is performed, and is installed along the line of the conveyor 21. Machine base 22
It has. The machine base 22 is provided with a work holding device that holds a housing as a work (hereinafter, may be referred to as a work), a press-fitting jig guide device, and a press-fitting jig driving device.

The work holding device 23 is a lower cylinder device 2 for holding the housing 1 as a work from below.
4, and the lower cylinder device 24 is installed vertically upward at a position directly below the conveyor 21 on the machine base 22. A holding table 25 is disposed at a position 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. Further, the holding table 25 and the cylinder device 24
A receiving base 26 is interposed between the supporting member 1 and the supporting base 26 so that a load acting downward on the housing 1 is supported by the receiving base 26 during the metal press-fitting operation.

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

A left stand 30 is vertically erected on one end (hereinafter referred to as a left end) on the machine base 22. A cylinder device 31 for driving a wedge is vertically provided on an upper end of the stand 30. It is installed facing downward.
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 a detailed description and illustration are omitted, the wedge driving cylinder device 31 is provided with a brake device, which is provided in an air pressure supply / discharge circuit and automatically operated by a back pressure. And a piston gripping device operated by the control valve. Then, the wedge driving cylinder device 31 is shortened by the force from the load side.
This is prevented by the brake device.

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

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

A stopper 34 is provided on the right side surface of the stand 30 so as to be adjustable in position.
4 is disposed such that its upper end face faces the lower end face of the wedge 32. Therefore, the lower limit position of the wedge 32 is regulated by the stopper 34.

A bush 35 is fitted in the mounting position of the wedge 32 in the stand 30 in the left-right direction. A guide rod 36 is inserted in the bush 35 in the left-right direction and slidably supported. A spring seat 37 projects from the left end of the guide rod 36, and a spring 38 is provided on the outer periphery of the guide rod 36.
It is inserted and mounted between the bush 7 and the bush 35 in a state of accumulation. Therefore, the guide rod 36 is always urged leftward by the spring 38.

The right end of the guide rod 36 is formed at the center of the wedge 32 so as to extend vertically in the guide hole 3.
2c, a reaction force receiving member 39 is provided at the right end thereof.
Are fixed to be orthogonal. The reaction force receiving member 39 is disposed so as to face the work 1, and the left end surface opposite to the work facing surface is slidably abutted on the slope 32 a of the wedge 32. At this time, since the guide rod 36 is constantly urged leftward by the spring 38, the reaction force receiving member 39 is constantly pressed against the slope 32a of the wedge 32 by the urging force of the spring 38. .

At the right end of the machine base 22, a right stand 40 is vertically erected, and a press-fitting jig guide device 41 is provided between the left stand 30 and the right stand 40. Four guide rails 42 are arranged between the left and right stands 30 and 40 at the front and rear upper and lower positions and laid in the left and right direction. The lower two guide rails 42,
A moving block 44 is slidably supported in the left-right direction on the moving guide block 42.
The rightmost position is regulated by the stopper 43 fixed to the second position.

Work 1 above moving block 44
A press-fitting jig holder 46 is rotatably supported at a horizontal position opposite to the support shaft 45 by a support shaft 45 horizontally extended in the front-rear direction. The holder 46 is provided with a driving device (not shown) such as an electric motor or an air motor. ) Is driven to reciprocate.

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 the vertical state. By abutting, the vertical position of the holder 46 is regulated.

A horizontal stopper 48 is provided at the upper right end of the moving block 44 so as to project downward in the vertical direction. The horizontal stopper 48 is at the right end when the press-fitting jig holder 46 is in a horizontal state. The horizontal position of the holder 46 is regulated by abutting the upper surface of the holder.

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

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

The press-fitting jig 50 is formed in an elongated multi-stage cylindrical shape, and a vacuum suction port 51 is formed concentrically on the outer end face for insertion thereof. The opened negative pressure supply path 52a is connected. The negative pressure supply path 52a is connected to a negative pressure supply port 52b opened in the holder 46. A negative pressure supply hose (not shown) is connected to the negative pressure supply port 52b, and a vacuum pump (not shown) is provided through the hose, the supply port 52b, and the supply path 52a.
At the vacuum suction port 51, a thrust bearing metal (hereinafter, referred to as a thrust metal) 11 is vacuum-held.

A first holding portion 53 for holding the first metal 5 is formed at an intermediate portion 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 around the outer periphery of the first holding portion 53 so as to detachably hold the first metal 5. 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 around the outer periphery of the second holding portion 54 so as to detachably hold the second metal 6. It has become.

Then, the first metal 5 is held in the first holding section 53 and the second holding section 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 About 1/2 to 1/5 of the length. In other words, the fitting positional relationship between the first holding unit 53 and the second holding unit 54 is set so that this condition is created.

The right stand 40 is provided with a press-fitting jig driving device 60. That is, the right stand 4
At 0, a press-fit cylinder device 61 is installed leftward in the horizontal direction, and the press-fit cylinder device 61 pushes the moving block 44 to the left via a load cell. Four bushes 62 are fixed to the right stand 40 so as to extend in the left-right direction at front and rear vertical positions, and a guide rod 63 is attached to each bush 62.
Is inserted and slidably supported in the left-right direction.

Each guide rod 63 has its left end fixed to a plate 64, and a load cell 65 fixed to the center of the plate 64. The load cell 65 is configured to detect a peak value of a press-fit load described later based on a command of each limit switch (not shown) disposed along the guide rail 42.

At a position below the press-fitting cylinder device 61 in the right stand 40, a return cylinder device 66 is installed leftward in the horizontal direction.
The sixth piston rod 66a is connected to the moving block 44 by a bracket 67.

Next, the metal press-fitting method according to one embodiment of the present invention will be described by explaining the operation of the metal press-fitting device according to the above configuration.

The housing 1 as a work of the metal press-in device 20 is conveyed to the position of the metal press-in device 20 while being mounted on the conveyor 21. The work 1 has the press-fit hole 3 directed to the right and the press-fit hole 4 directed to the left, and the fixed shaft 10 press-fitted into the vertical press-fit hole 9 faces upward.

The work 1 is lifted from above 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-fit hole 9 to which the fixed shaft 10 is fixed is formed with high precision, when the fixed shaft 10 is held by the holder 29, the work 1 is in a state where predetermined positioning is secured.

In this state, the wedge drive cylinder device 31 is extended, and the wedge 32 is lowered. As the wedge 32 descends, the reaction force receiving member 39 constantly in contact with the slope 32a of the wedge 32 via the rod 36 by the urging force of the spring 38 is pushed rightward according to the inclination of the slope 32a. . Then, when the reaction force receiving member 39 comes into contact with the right side flat surface on the left end surface of the work 1, the reaction force receiving member 39
The position of the wedge driving cylinder device 31 is automatically stopped by the brake device because the position of the wedge driving cylinder device 31 is regulated by the work 1 that is positioned and held by the holder 29.

Therefore, the work 1 positioned with reference to the fixed shaft 10 is provided by the reaction force receiving member 39 regardless of the dimensional variation of the housing side wall in the axial direction (left-right direction) connecting the press-fit hole 3 and the press-fit hole 4. The reaction receiving surface against the press-fitting can be received. In other words, by adjusting the vertical position of the wedge 32, the reaction force receiving member 39 absorbs the dimensional variation in the thickness of the side wall of the housing, which is usually present, in the left-right direction, so that the reaction force receiving surface of the work 1 is always properly adjusted. Will be created.

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
When 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. You. Similarly, when the second metal 6 is conveyed to the press-fitting jig 50 by a parts feeder (not shown) and is lowered, the second metal 6 is fitted and mounted on the outer periphery of the second holding portion 54.

Subsequently, the thrust metal 11 is conveyed to the press-fitting jig 50 by a parts feeder (not shown) and is lowered to be placed on the vacuum suction port 51. The thrust metal 11 placed on the vacuum suction port 51 is supplied to the vacuum suction port 51 by a negative pressure supply path 52a and a negative pressure supply port 52b.
When the negative pressure is supplied, the vacuum suction port 51 is vacuum-sucked and the state is 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 turned 90 degrees by a driving device (not shown), and the press-fitting jig is rotated. 50 is tilted horizontally leftward. During this rotation operation, the horizontal right end of the press-fitting jig holder 46 is buffered by the shock absorber 49.
First metal 5 and second metal 6 mounted on press-fitting jig 50
And the thrust metal 11 is dropped by the impact,
Idling is prevented.

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 horizontally leftward along the guide rail 42 via the load cell 65. . At this time, the piston rod 66a of the return cylinder device 66 is also extended.

The moving block 44 is provided with the press-fitting cylinder device 6.
When the tool 1 is advanced leftward, the press-fitting jig 50 turned leftward in the horizontal direction advances with respect to the work 1 and is sequentially inserted into the press-fit holes 3 and 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-fit 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 the press-fitting hole 3, it passes through the press-fit 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-fit hole 3 after passing through the press-fit hole 3, the press-fitting of the first metal 5 into the press-fit hole 3 is started. When the press-fitting of the first metal 5 into the press-fitting hole 3 has progressed about 1/2 to 1/5 of the length of the first metal 5, a limit switch (not shown) is operated, so that the press-fitting load is increased. Is detected by the load cell 65.

On the other hand, as described above, 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-fit holes 3 and 4 of the work 1 is such that L ₁ > L ₂ ,
, The press-fit hole 3 of the first metal 5
At the time when the press-fitting into the press-fitting starts, the press-fitting of the second metal 6 into the press-fitting hole 4 is not started. Then, when the press-fit load of the first metal 5 into the press-fit hole 3 exceeds the peak value, the press-fit of the second metal 6 into the press-fit hole 4 is started.

Next, 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 performed simultaneously. proceed. The peak value of the total press-fit load in both the press-fitting process of the first metal 5 and the second metal 6 into the press-fitting hole 3 and the press-fitting hole 4 is increased by the operation of the limit switch (not shown). Is 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 is detected by a limit switch (not shown), and the extension operation of the press-fit cylinder device 61 is stopped.

FIG. 7 shows the relationship between the load at the time of press-fitting the first metal 5 into the press-fitting hole 3 and the load at the time of press-fitting the second metal 6 into the press-fitting hole 4, and the stroke of the press-fitting jig 50. FIG.

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

The horizontal axis represents the stroke of the press-fitting jig 50, where A is the press-fitting start point of the first metal 5, B is the press-fit load determination timing of the first metal 5, and B 'is the second metal Reference numeral 6 denotes a press-fitting start point, C denotes a press-fit load determination timing of the first metal 5 and the second metal 6, and C ′ denotes 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 for a non-defective product. When the load between the strokes B to C 'is in the range of b to c, it is determined to be non-defective.

On the other hand, a dashed curve 13 shows a load-stroke characteristic when the first metal 5 is not provided. In this case, the load within the range of the strokes B ′ to C ′ is outside the range of b to c. Therefore, in this case, it is determined that the product is defective. The absence of the first metal 5 corresponds to the case where the press-fit of the first metal 5 into the press-fit hole 3 is too slow.

The dashed-dotted line curve 14 indicates the load-stroke characteristic when the second metal 6 is not provided. In this case, the load within the range of the strokes B ′ to C ′ is outside the range of b to c. Therefore, in this case, it is determined that the product is defective. And the second metal 6
When there is no, it corresponds to the case where the press-fitting of the second metal 6 into the press-fitting hole 4 is too slow.

As described above, when the first metal 5 and the second metal 6 are sequentially pressed into the press-fit holes 3 and 4 of the housing 1, the reaction force receiving member 39 is provided on the left end face of the housing 1. Irrespective of the dimensional variation of the side wall, it is always in contact, so that 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. That is, since the dimensional error in the side wall of the housing 1 is absorbed by the wedge 32 and the reaction force receiving member 39 is abutted at right angles to the right side surface of the stand 30, a sufficient reaction force can be obtained even when the press-fitting load is large. It can be obtained from the stand 30.

At this time, since the slope 32a of the wedge 32 is set at 5 degrees, the vertical component caused by the press-fitting load, that is, the component that tries to release the wedge 32 upward, The frictional force due to the direct pressure on the stand 30 does not surpass. Therefore, despite the fact that the wedge 32 is interposed between the reaction force receiving member 39 and the stand 30, the reaction force receiving member 39 can sufficiently support a large pressure load.

After the first metal 5 and the second metal 6 are press-fitted into the press-fit holes 3 and 4 of the housing 1 as described above, the press-fit cylinder device 61 is shortened. Further, the return 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 moving block 44 is in a state where the retreat is restricted.

Since the first metal 5 and the second metal 6 are press-fitted into the press-fit holes 3 and 4 of the housing 1, respectively, the press-fit jig 50 is moved along with the retreat of the moving block 44. And it is pulled out from the second metal 6 and retreated together with the holder 46.

When the press-fitting jig 50 is 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 placed at the bottom of the press-fit hole 4 into which the second metal 6 is press-fitted.

When the above press-fitting operation is completed, the upper cylinder device 28 is shortened, and the holder 29 is pulled out of 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 operated intermittently, and the work 1 is transported to the next process. Thereafter, the above operation is repeated, so that the first metal 5 and the second metal 5
The press-fitting work of the metal 6 is sequentially performed.

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

By detecting the peak value of the total press-fit load of the second metal 6 and the first metal 5 after the press-fit of the first metal 5, the load of the second metal 6 from the press-fit hole 4 after the press-fit is detected. Can be obtained, so that a dedicated measurement process for the off-line load after the press-fitting operation can be omitted.

With the above, the workability of the entire manufacturing process of the motor with the worm speed reducer can be improved.

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

By changing and adjusting the position of the reaction force receiving member 39 with respect to the work 1 by using the wedge 32,
, The dimensional variation of the side wall in the press-fit direction can be absorbed, so that the press-fit load of the work 1 can be constantly supported irrespective of the dimensional variation due to the processing dimensional error of the work 1, and the press-fit precision is always constant And press-fitting accuracy can be improved.

It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various changes can be made without departing from the scope of the present invention.

For example, the press-fitting jig guide device is not limited to the configuration as in 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 kept horizontal. You may comprise.

The press-fitting jig driving device is not limited to a configuration in which the press-fitting stroke and the return stroke are performed by the separate cylinder devices, but may be configured to be performed by a shared cylinder device.

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

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

Further, in the above embodiment, the case where the bearing for rotatably supporting both ends of the worm shaft is press-fitted into the gear housing of the motor with the worm reduction gear is described, but the present invention is not limited to this. Instead, the present invention can be applied to a general bearing press-fitting technique in which two bearings are press-fitted on the same axis of a bearing housing.

[0080]

As described above, according to the present invention,
By detecting the peak value of the press-fit load to the first female portion of the first bearing, it is possible to determine the load from the first female portion of the first bearing after press-fitting. Further, by detecting the peak value of the total press-fit load of the second bearing and the first bearing after the press-fitting of the first bearing, the second bearing after the press-fitting is detected.
The load from the second female portion of the bearing can be determined.

[Brief description of the drawings]

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

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

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

FIG. 4 is a partially cutaway front view showing a press-fitting jig guide device and a driving 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 the 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]

DESCRIPTION OF SYMBOLS 1 ... Housing, 2 ... Main body, 3 ... Press-fitting hole (1st female part),
4 ... Press-fitting hole (second female portion), 5 ... First metal (first bearing), 6 ... Second metal (second bearing), 7 ... Worm wheel accommodation room, 8 ... Motor mounting portion, 9 ... Vertical press-fitting Holes, 10
... fixed shaft, 20 ... metal press-fitting device (bearing press-fitting device), 2
DESCRIPTION OF SYMBOLS 1 ... Conveyor, 22 ... Machine stand, 23 ... Work holding device, 2
4: Lower cylinder device, 25: Holder, 26: Cradle,
27 ... bracket, 28 ... upper cylinder device, 28a ...
Piston rod, 29: Holder, 30: Left side 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 receiving member, 40 ... Right stand, 41 ... Press-in jig guide device, 42 guide rail, 43 stopper, 44 moving block, 45 support shaft, 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 | maintenance part, 54 ... 2nd holding | maintenance part, 60 ... Press-fitting jig drive, 61 ... Press-fitting cylinder device, 62 ... Bush, 63
... guide rod, 64 ... plate, 65 ... load cell,
66 ... return cylinder device, 66a ... piston rod,
67 ... Bracket.

Continuation of front page (56) References JP-A-59-214520 (JP, A) JP-A-61-4632 (JP, A) JP-A-1-97530 (JP, A) JP-A-59-7531 (JP, A) JP-A-2-88120 (JP, A) JP-A-62-179925 (JP, A) JP-A-61-203237 (JP, A) JP-A-61-141025 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B23P 19/02 F16C 35/00

Claims (2)

(57) [Claims] 1. A first female part into which a first bearing is press-fitted, and a second female part into which a second bearing having an outer diameter slightly smaller than the outer diameter of the first bearing is press-fitted. The first bearing and the second bearing are respectively fitted on the outer circumference of a rod-shaped press-fitting jig, and the press-fitting jig is connected to a first female part and a second female part of the bearing housing. The first bearing is inserted into the first female portion from the first female portion side along the axis with the second bearing fitting side first, and the second bearing is inserted into the second female portion. In the bearing press-fitting method in which the first bearing is press-fitted in one stroke, the press-fitting of the second bearing into the second female portion is started from the time when the press-fitting of the first bearing into the first female portion has advanced to an intermediate position. And a time point at which the press-fitting of the first bearing into the first female portion is completed, and Bearing press-fitting method and press-fitting the end of the second bearing is characterized in that it is substantially matched. 2. A bearing press-fitting device for implementing the bearing press-fitting method according to claim 1, comprising: a holding device for holding the bearing housing; and a guide device for guiding movement of the press-fitting jig along the axis. A driving device that drives movement of the press-fitting jig along the axis to press-fit the first bearing and the second bearing into the first female portion and the second female portion, respectively. The fitting position between the first bearing and the second bearing is such that the distance between the distal end surface of the first bearing and the distal end surface of the second bearing is greater than the distance between the entrance of the first female part and the entrance of the second female part in the housing. The bearing press-fitting device is configured to be larger and smaller than the axial length of the first bearing.