JP2944889B2 - Bearing centering method - 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 for centering a pair of bearing holes formed on a pair of bearing members fixed to each other and supporting one shaft at two places. Centering method.

[0002]

2. Description of the Related Art As an apparatus for assembling a bearing used for this kind of purpose, there is a technique disclosed in Japanese Patent Publication No. 62-136136. In this technique, the sub bearing is moved relative to the main bearing in a state where the shaft is inserted into each of the insertion holes of the main bearing and the sub bearing, and the main bearing is moved within a gap formed between the shaft and the two insertion holes. In contrast, the maximum dimension width at which the sub-bearing can be eccentric is detected, the sub-bearing is positioned at the center of this width, and is tightened and fixed to the main bearing.

[0003]

In the above prior art, both bearing holes are always concentric, regardless of whether the bearing gap between the bearing holes and the shaft is the same. Therefore, when there is a difference in the bearing gap due to manufacturing tolerance or the like, the same level difference occurs on the inner surface of both bearing holes in the entire circumference. Therefore, in the case of thrust in a certain direction perpendicular to the axis during use, such as a rotary compressor,
Since each bearing hole is one-sided, durability deteriorates due to uneven wear, and a problem such as seizure of the bearing may occur depending on use conditions.

The present invention makes it possible not only to center a pair of bearing holes but also to center the pair of bearing holes so that no step is formed on the inner surface in a predetermined phase direction. The purpose is to solve such a problem.

[0005]

According to the present invention, there is provided a bearing centering method, comprising: a first bearing hole formed in a first bearing member; and a second bearing which is detachably abutted and fixed to the first bearing member. The present invention relates to a bearing centering method for centering a second bearing hole formed in a member, and inserts one shaft into each bearing hole of the two bearing members slidably contacting each other. Then, an elastic force is applied to a portion of the shaft protruding from one of the two bearing holes toward the axis from the side, and the shaft is made to have at least two of the outer edges of the inner surfaces of the two bearing holes.
The two bearing members are relatively moved in at least one direction in a state where the two bearing members are in contact with each other, and the relative movement amount of the two bearing members and the relative movement direction of the protruding portion of the shaft during the movement. wherein measuring the amount of movement for one of the two bearing members in. In the present invention, a refraction point of a change characteristic of the movement amount of the protruding portion with respect to the relative movement amount is calculated based on the measurement result, and the relative movement amount at the refraction point and the movement amount of the protruding portion are calculated. The relative movement amount at the position where the two bearing holes are centered is calculated based on the position, and the two bearing members are relatively positioned at the position where the relative movement amount is obtained to fix the both bearing members.

[0006]

A shaft is inserted into each of the bearing holes of the bearing members slidably in contact with each other, and a portion of the shaft protruding from one of the bearing holes is elastically moved from the side toward the axis. Is added, the shaft is abutted at at least two of the outer peripheral portions of the inner surfaces of the bearing holes. If the bearing members are relatively moved in this state, the abutting position between the shaft and the inner surface of the bearing hole is improved. Changes discontinuously. Thus, the relative movement of the two bearing members, changing JP <br/> of the movement amount or for one of the two bearing members projecting part of the shaft, the refracted straight twice. If the two bearing members are relatively moved in another direction, even in that direction,
In the same manner as described above, a change characteristic consisting of a straight line refracted twice is obtained.

[0007] Based on the relative movement amount of the two bearing members and the movement amount of the protruding portion of the shaft at the refraction point, the relative movement amount for concentrically centering the two bearing holes, and the relative movement amount in a predetermined phase direction. The position of the relative movement amount for centering so that no step is formed on the inner surface of the bearing hole is calculated. Then, the two bearing members are relatively positioned at a position where one of the relative movement amounts is obtained, and the both bearing members are fixed. To obtain the position of the refraction point of the change characteristic, it is not necessary to perform measurement over the entire range of the relative movement of the two bearing members,
It is sufficient to measure up to a position beyond this refraction point to some extent.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, referring to FIGS. 1 to 4, a description will be given of an apparatus used for manually performing the method of the present invention. As shown mainly in FIG. 1, a machine frame 10 of this apparatus is composed of a lower support plate 11, an upper support plate 12, a top plate 13, and four columns 14, 15, 16 connecting these components. Lifting cylinder 1 attached to lower support plate 11
A lifting table 20 is attached to the upper end of the piston rod 17a of No. 7. The elevating cylinder 17 is mounted on the machine frame 10.
By operating the cylinder operating lever 19 of the operation panel 18 provided in the above, the elevating platform 20 is moved up and down between a workpiece attaching / detaching position indicated by a solid line and a centering position indicated by a two-dot chain line 20A.

As shown in FIGS. 1 to 3, the elevator 20
An elevating table 22 is provided at the upper end of the piston rod 17a of the elevating cylinder 17 via the support plate 21a and the support legs 21b. Pedestal 2 having positioning pins 23b on the upper and lower surfaces at the center of the lifting table 22
3 and the protection cylinder 26 are fixed, and both members 23 and 26 are formed with center holes 23a and 26a (see FIGS. 3 and 4) coaxially with each other. (Not shown). Each of these center holes is provided with a rotary compressor (workpiece) W described below.
Has a diameter sufficiently larger than that of the crankshaft Wc. On the upper surface of the elevating table 22, a frame-side V-block 24 is fixed on one side of the pedestal 23, and a bracket 25a to which a manual pressing screw 25 is screwed is fixed on the other side.

On the pedestal 23, a frame (first bearing member)
A rotary compressor (workpiece) W composed of Wa, a head (second bearing member) Wb, and a crankshaft (shaft) Wc is placed, and the frame Wa is engaged with the positioning pin 23b to be positioned in the phase direction and pressed. The two slopes 2 of the frame-side V-block 24 by the screw 25
4a, the lifting table 22 is pressed.
Is mounted. First and second bearing holes Sa, Sb formed in frame Wa and head Wb
The crankshaft Wc to which the rotor (not shown), which is supported by the bearing (see FIG. 5 and the like) and which is located in the frame Wa, is fixed, comprises a lifting table 22, a pedestal 23, and a protective cylinder 26.
Projecting downward through each central hole.

When the lifting table 22 is raised to the centering position, the rotary compressor W, the frame-side V block 24, the pressing screw 25, and the bracket 25a
Enters the rectangular opening 12 a formed in the upper support plate 12, and the three contact blocks 28 a fixed on the upper surface of the elevating table 22 contact the three contact blocks 28 b fixed on the lower surface of the upper support plate 12. Up and down. In this centering position, the lifting table 22 is screwed to a bracket 29b fixed to the lower surface of the upper support plate 12, one side end face is pressed by a pressing screw 29 having a knob 29a, and fixed to the other side end face. Guide block 2 in which guide block 27a is fixed to the lower surface of upper support plate 12
7b, whereby positioning in the left-right direction with respect to the upper support plate 12 is performed. Although not shown, the elevation table 22 is also positioned in the front-rear direction with respect to the upper support plate 12 by the same pressing screws and guide blocks.

A pair of lateral moving members 31 are respectively supported on a pair of lateral guide rails 30 fixed to the front and rear portions below the top plate 13 of the machine frame 10 so as to be slidable in the left and right direction. A pair of vertical guide rails 32 connecting them are fixed to the lower side of each pair of horizontal moving members 31. XY
Two pairs of vertical moving members 33 fixed to the upper surface of table 35
Are supported by the vertical guide rails 32 so as to be slidable in the front-rear direction, whereby the XY table 35 is supported by the machine frame 10 so as to be movable in the front-rear direction and the left-right direction with respect to the upper support plate 12. The XY table 35 has a manual lateral movement handle 38.
And by the vertical movement handle 39, it is moved in the left-right direction and the front-back direction.

On the lower surface of the XY table 35, a block guide rail 36 and a pressing piece guide rail 3 extending in the left-right direction are provided.
7 are fixed in a straight line on both sides with an opening 35a formed in the center. The moving members 40 and 45 slidably guided and supported by the guide rails 36 and 37 respectively include a head-side V-block 41 and a pressing piece 46 on the opposite end side.
Are fixed, and feed screws 42 and 47 fixed to tips of interlocking shafts 43 and 48 rotatably supported by brackets 43b and 48b fixed to the lower surface of the XY table 35 respectively are attached to moving members 40 and 45, respectively. It is screwed. Manual knob 43a fixed to the other end of the interlocking shaft 43
To move the moving member 40 to move the head side V block 41
The two slopes 41a of the head W of the rotary compressor W
b, lightly abutting the outer peripheral surface of the head Wb by moving the moving member 45 by turning the manual knob 48a fixed to the other end of the interlocking shaft 48, and moving the outer peripheral surface of the head Wb by the tip of the pressing piece 46 to the head side V block. The head Wb is positioned and attached to the XY table 35 by pressing the two inclined surfaces 41a of the head 41.

The head clamp mechanism 50 provided at the center of the top plate 13 has a guide cylinder 51 fixed to the top plate 13 coaxially and vertically with the center hole 23a of the pedestal 23. A clamp block 54 having a stopper plate 54a is held at a lower end of a clamp rod 52 supported in the center hole of the guide cylinder 51 so as to be slidable in the axial direction so as to be able to move a little distance. The clamp rod 52 can be axially moved within a predetermined range by a stopper pin 53 fixed to the guide cylinder 51 and a notch 52a engaged with the stopper pin 53, and between the guide cylinder 51 and the stopper plate 54a when no external force is applied. Is urged to the lowermost position by a spring 55 interposed therebetween. A manual knob 56 is attached to the holding plate 51a fixed to the upper end of the guide cylinder 51.
A pressing screw 56 having an a is screwed coaxially above the clamp rod 52. Two screw tightening rods 58 for tightening screws Wd of the rotary compressor W are provided in parallel with the clamp rod 52 and the pressing screw 56, and a grip 58a is provided at an upper end thereof.

As shown mainly in FIGS. 2 and 4, on the lower surface of the elevating table 22, a portion of the crankshaft Wc projecting downward from the frame Wa is pressed toward the axis from the side orthogonal to the frame. A pair of pressing devices 60 are mounted so as to be arranged in the left-right and front-back directions. The main body 61 of each pressing device 60 fixed to the lower surface of the lifting table 22
, A guide tube 62 is inserted therethrough and fixed by a nut 68. The pressing rod 63 slidably inserted into the center hole of the guide cylinder 62 has a hemispherical head 63a formed on the crankshaft Wc side, and a small diameter portion 63b wound between the guide rod 62 and the opposite side. A rotating compression spring 64 is interposed. A knob 65 and a locking member 66 are fixed to the rear end of the small diameter portion 63b.
Is a rod 67 projecting rearward from the main body 61 (see FIG. 2)
Can be engaged.

As shown by the solid line in FIG. 2, when the distal end 66a of the locking member 66 is not engaged with the rod 67, the pressing rod 63 is urged by the spring 64 and the head 63a is moved to the crankshaft Wc. (See the pressing device 60 on the left side in FIG. 4), the pressing rod 63 is retracted by the knob 65 against the spring 64, and as shown by the two-dot chain line in FIG. Tip 66a
Is engaged with the rod 67 so that the head 63a is kept away from the crankshaft Wc (see the upper pressing device 60 in FIG. 4).

As shown in FIGS. 2 and 3, the upper support plate 1
Two sets of head position detectors 70A and 70B that measure the position of the head Wb in the left-right and front-rear directions with respect to the upper support plate 12 are mounted on the upper surface of the base 2 at right angles to each other via a mounting block 71. I have. Each of the head position detecting devices 70A and 70B is an electric micrometer including a main body 70a fixed to the mounting block 71 and a spindle 70b movable in the longitudinal direction with respect to the main body 70a. (The head position detecting device 7 on the left side in FIG. 3)
0A), and is switched to a retracted position (see the lower head position detecting device 70B in FIG. 3) in which the tip thereof is separated from the head Wb.

As shown in FIGS. 2 and 4, two sets of shaft position detecting devices 75 are provided on the lower surface of the lifting table 22.
A and 75B are mounted at right angles to each other via a mounting block 76. The shaft position detecting devices 75A and 75B are configured such that the tips of the spindles 75b abut against points Wca and Wcb on the outer peripheral surface of the crankshaft Wc protruding downward from the protection cylinder 26, and the points Wca and Wcb with respect to the elevating table 22. To measure the position in the left, right, front and rear directions. Each shaft position detecting device 75
Reference numerals A and 75B denote electric micrometers similar to the head position detecting devices 70A and 70A, which are similarly switched between the measurement position and the retracted position. As shown, the shaft position detecting devices 75A and 75B are disposed coaxially with the pressing rod 63 of each pressing device 60 on the opposite side of the crankshaft Wc, and are also disposed on the opposite side of the head position detecting devices 70A and 70B. Have been.

Next, a description will be given of an embodiment of the present invention in which the above-described apparatus is used. In a state where the elevating table 20 is lowered to the workpiece attaching / detaching position, the temporarily assembled frame Wa, the head Wb, and the crankshaft Wc are placed on the pedestal 23 of the elevating table 22, and the frame Wa is, as described above, a frame. By the side V block 24 and the pressing screw 25,
It is positioned and attached to the lifting table 22. In this tentatively assembled state, the fastening by the fastening screw Wd is loose, and the frame Wa and the head Wb are slidably contacted. Next, the lifting table 20 is raised by the lifting cylinder 17 to the centering position shown in FIG. In this state, the upper ends of the head Wb and the crankshaft Wc are elastically pressed by the spring 55 via the clamp block 54, and the head Wb is attached to the XY table 35 by the head side V block 41 and the pressing piece 46.

In this state, X is moved by the lateral movement handle 38.
The Y table 35 is moved in the left-right direction, the frame Wa and the head Wb are relatively moved to perform centering in the left-right direction, and the XY table 35 is moved in the front-rear direction by the vertical movement handle 39 so that the frame Wa and the head are moved. Wb is relatively moved to perform centering in the front-rear direction. Hereinafter, a specific method of this centering will be described in detail.

For centering in the left-right direction, only the tip of the pressing rod 63 of the pressing device 60 in the left-right direction, the spindle 70b of the head position detecting device 70A and the spindle 75b of the shaft position detecting device 75A are applied to the head Wb or the crankshaft Wc. The pressing rod 63 of the pressing device 60 in the front-rear direction and the spindle 7 of the head position detecting device 70B
0b and the spindle 75 of the shaft position detecting device 75B
b is performed such that the respective tips do not come into contact with the head Wb or the crankshaft Wc so as to be retracted.

First, the XY table 35 to which the head Wb is attached is moved to the leftmost by the lateral movement handle 38. In this state, the head Wb is moved to the position b shown in FIG.
0, and the outer peripheral surface of the crankshaft Wc is
a of the first bearing hole Sa, and abuts on the right end of the lower edge of the head Wb. From this state, the XY table 35 is moved by the lateral movement handle 38.
Together with the head Wb to the right, the position a of the point Wca on the outer peripheral surface of the crankshaft Wc detected by the shaft position detecting device 75A with respect to the position b of the head Wb detected by the head position detecting device 70A, Take multiple measurements. Position b obtained from the plurality of measurement results
Change characteristic position a relative becomes a straight line having two refracting points c1, c2 shown in FIG.

That is, if the head Wb is moved rightward from the position b0 shown in FIG.
FIG. 5C shows a state in which the head c moves away from the right edge of the lower edge of the head Wb and reaches the position b1 and abuts on the left edge of the upper edge of the second bearing hole Sb.
Until the state shown in (b) is reached, the crankshaft Wc elastically biased by the pressing device 60 does not move at all. Therefore, during this time, the position a of the point Wca measured by the shaft position detecting device 75A does not change, and c0 to c0 in FIG.
The change characteristic is indicated by c1, and the gradient is 0. FIG.
If the head Wb is moved rightward from the state of (b), the upper end of the crankshaft Wc is pushed by the upper left edge of the second bearing hole Sb, and is separated from the upper left edge of the first bearing hole Sa.
The first bearing hole Sa rotates around the right end of the lower edge thereof against the urging force of the pressing device 60. When the head Wb reaches the position b2, the right inner surface of the first bearing hole Sa and the left inner surface of the second bearing hole Sb are in line contact with the outer peripheral surface of the crankshaft Wc in FIG.
This state continues until the position shown in (c) is reached. During this period, the position a of the point Wca has the changing characteristics shown by c1 to c2 in FIG. 6, and the gradient is z / (w + x + y). In addition, each code is as follows (refer FIG. 5).

W: width of the second bearing hole Sb x: distance between the first bearing hole Sa and the second bearing hole Sb y: width of the first bearing hole Sa z: crank from the lower edge of the first bearing hole Sa The length to the point Wca on the outer peripheral surface of the shaft Wc.

When the head Wb is further moved rightward from the state shown in FIG. 5C, the crankshaft Wc is pushed by the lower left edge of the second bearing hole Sb, and the lower right edge of the first bearing hole Sa. , And rotates about the upper edge right end of the first bearing hole Sa against the urging force of the pressing device 60. When the head Wb reaches the position b3, the outer peripheral surface of the crankshaft Wc abuts on the lower left end and the upper right end of the first bearing hole Sa in FIG.
This state continues until the position shown in (d) is reached. During this period, the position a of the point Wca has the changing characteristics shown by c2 to c3 in FIG. 6, and the gradient is z / (x + y). In the state of FIG. 5D, the outer peripheral surface of the crankshaft Wc has the first bearing hole S.
Since the head Wb is in contact with the lower left edge and the upper edge right edge of the head Wb and is in contact with the lower edge left edge of the head Wb, further movement of the head Wb to the right is stopped.

As described above, the head position detecting device 70A
The refraction points c1 and c2 are detected by measuring the position a of the point Wca on the outer peripheral surface of the crankshaft Wc detected by the shaft position detection device 75A with respect to the position b of the head Wb detected by the above plural times. In other words, this measurement was performed using c0 to c1, c1 to c2, and c2 to c3.
Is performed twice or more in each of the ranges, and the measurement results are plotted on a chart or calculated, or the position b of the head Wb at each of the refraction points c1 and c2.
1, b2 and the positions a1, a2 of the point Wc1 on the crankshaft Wc are detected.

Next, these positions a1, a2, b1, b2
, The bearing holes Sa, Sb on one side in the left-right direction
The position b4 of the head Wb when centering so that no step is formed on the inner surface of the head, and the two bearing holes Sa,
The calculation of the position b5 of the head Wb when Sb is centered concentrically will be described.

First, a bearing hole S is provided on one side in the left-right direction.
A method of calculating the position b4 of the head Wb when the centering is performed so that no step is formed on the inner surfaces of the a and Sb will be described with reference to FIGS. Since the range of change of the inclination angle of the crankshaft Wc is extremely small, the following equations are established by using the symbols entered in FIG.

[0029]

ΔH = Δ1 + Δ2 Δ1 = b1−b0 Δ2 = (w / y) ΔF = (w / y) (y / z) (a1−a2) Therefore, b4 is calculated by the following equation.

[0030]

B4 = b2-.DELTA.H = b2- (b1-b0)-(w / z) (a1-a2) The head Wb is moved so that the position detected by the head position detecting device 70A becomes b4. If the frame W
a and the head Wb are provided on one side in the left-right direction with bearing holes Sa,
Sb is centered so that no step is formed on the inner surface.

Further, in the left and right direction, both bearing holes Sa, S
If the method of calculating the position b5 of the head Wb in the case where b is concentrically centered is described with reference to FIGS. 5 and 8, the following equations are established in the same manner as described above.

[0032]

ΔF = (y / z) (a1-a2) Therefore, b5 is calculated by the following equation.

[0033]

B5 = b2- (ΔH / 2 + ΔF / 2) = b2- (b1-b0) / 2- (a1-a2) (w + y) / 2 · z The position detected by the head position detecting device 70A is If the head Wb is moved to be b5, the frame W
a and the head Wb are centered so that the bearing holes Sa and Sb are concentric in the left-right direction. As can be seen from the arithmetic expressions at the positions b4 and b5, the point c in FIG. 6 corresponding to FIG.
No measurements of positions a 3 , b 3 at 3 are required. That is, in the range of c2 to c3, it is sufficient to perform measurement at at least two points on the c2 side.

The centering in the front-rear direction is opposite to the case of centering in the left-right direction.
This is performed in the same manner as described above, with only the tip of the spindle 70b of the head position detecting device 70B and the tip of the spindle 75b of the shaft position detecting device 75B abutting on the head Wb or the crankshaft Wc. The position of the head Wb when centering so that there is no step on the inner surface of the bearing holes Sa and Sb on one side in the front-rear direction, and the position of the head Wb when centering both bearing holes Sa and Sb in the front-rear direction. The arithmetic expressions for calculating the position are substantially the same as those in the horizontal direction described above, and centering is performed in the same manner.

The relationship of centering in the left-right and front-back directions is as follows. When the bearing holes Sa and Sb are centered so that there is no step in the left-right direction, the centering is performed concentrically in the front-rear direction. When the bearing holes Sa and Sb are centered so that there is no step in the front-rear direction, the centering is performed concentrically in the left-right direction. When the bearing holes Sa and Sb are centered concentrically, they are centered concentrically on both the left and right and front and rear.

As described above, the frame Wa and the head W
After centering b, the pressing screw 56a is turned by the knob 56a.
, Press the head Wb through the clamp rod 52 and the clamp block 54 so as not to move against the frame Wa, insert the hexagonal part of the tip of the screw rod 58 into the hexagon hole of the tightening screw Wd, and use the grip 58a. By rotating, the head Wb is fastened and fixed to the frame Wa.
Next, after turning the knobs 43a and 48a to retract the head-side V-block 41 and the pressing piece 46, the elevating table 20 is lowered by the elevating cylinder 17 to the workpiece attaching / detaching position.
Loosen the pressing screw 25 and remove the rotary compressor W. Subsequently, the next rotary compressor W, which has been temporarily fixed to the frame Wa and the head Wb and is not centered, is mounted on the pedestal 23 to perform centering.

In the first embodiment described above, the frame Wa
9 to 12 show an example in which the outer peripheral surface of the crankshaft Wc abuts the upper and lower edges of the first bearing hole Sa to restrict the maximum inclination angle of the crankshaft Wc.
The second embodiment shown in FIG. 7 is different in that the maximum inclination angle of the crankshaft Wc is restricted by the outer peripheral surface of the crankshaft Wc abutting on the upper and lower edges of the second bearing hole Sb of the head Wb. However, the device used for centering is common to both embodiments.

As in the first embodiment, in the second embodiment,
The frame Wa and the head Wb are moved by the handle 38 for lateral movement.
Is relatively moved in the left-right direction to perform centering in the left-right direction,
The frame Wa and the head Wb are moved by the handle 39 for vertical movement.
Are relatively moved in the front-rear direction to perform centering in the front-rear direction.

The head Wb is moved rightward with the XY table 35 by the lateral movement handle 38, and the crankshaft Wc detected by the shaft position detecting device 75A with respect to the position b of the head Wb detected by the head position detecting device 70A. The position a of the point Wca on the outer peripheral surface is measured a plurality of times. The change characteristic of the position a with respect to the position b obtained from the plurality of measurement results is 2 as shown in FIG.
This is a straight line having two refraction points c1 and c2, and its specific shape is different from that of the first embodiment. Each refraction point c1, c
2, the positions a1 and a2 of the head Wb and the positions b1 and b2 of the point Wc1 on the crankshaft Wc are obtained by plotting or calculating the measurement results on a chart as in the first embodiment. And these positions a
1, a2, b1, b2, the position b6 of the head Wb when centering the inner surface of the bearing holes Sa, Sb so that no step is formed on one side in the left-right direction, and the two bearing holes Sa in the left-right direction. , Sb are calculated concentrically to the position b7 of the head Wb. The process of the calculation is the same as that of the first embodiment, so that the description is omitted, and only the result is described below.

[0040]

B6 = b2- (w / z) (a1-a2) b7 = b2- (b1-b0) / 2- (a1-a2) (w
+ Y) / 2 · z With these, centering in the left-right and front-back directions is performed.

The relationship between centering in the left-right and front-back directions, the tightening of the frame Wa and the head Wb, and the removal of the rotary compressor W after centering are the same as in the first embodiment.

Although the above embodiments have been described with reference to the case where the present invention is implemented manually, the present invention can be implemented automatically by an electronic control unit using a microcomputer.

In each of the above embodiments, the case where the phase direction in which the step on the inner surfaces of both bearing holes does not occur is the left-right or front-rear direction, but the step on the inner surfaces of both bearings is prevented from occurring in any phase direction. You can also. In this case, the positions b8 and b9 of the head Wb in both the left, right, front and rear directions may be set in the following relationship.

[0044]

[6] ^{(b8-b5) 2 + (} b9-b5) 2 = (b4-
b5) ² or (b8-b7) ² + (b9-b
7) ² = (b6-b7) ^{2 where} (b8-b5) / (b9-b5) or (b8-b5)
b7) / (b9-b7) is a value corresponding to the phase direction in which the step on the inner surface of the bearing is eliminated.

In each of the above embodiments, the case where the upper end surface of the crankshaft Wc and the upper end surface of the head Wb are on the same plane has been described. However, both end surfaces need not necessarily be on the same plane.

[0046]

As described above, according to the present invention, when each bearing gap between one shaft and a pair of bearing holes for bearing the shaft is different due to manufacturing tolerances, etc. In addition to centering the holes concentrically, it is possible to center the two bearing holes and fix both bearing members so that there is no step on the inner surface of both bearing holes in a predetermined phase direction, so that during use, When thrust is generated in a predetermined phase direction orthogonal to the axis, each bearing hole and the shaft can be uniformly hit in the axial direction. This eliminates uneven wear, so that durability can be improved,
Further, problems such as seizure of the bearing can be solved.

[Brief description of the drawings]

FIG. 1 is an overall side view of an apparatus used for a bearing centering method according to the present invention.

FIG. 2 is a sectional view showing a main part of the device shown in FIG.

FIG. 3 is a sectional view taken along line 3-3 in FIG. 2;

FIG. 4 is a sectional view taken along line 4-4 of FIG. 2;

FIG. 5 is an explanatory diagram showing a change in a state accompanying movement of a head in the first embodiment of the bearing centering method according to the present invention.

FIG. 6 is a view showing a change characteristic of a position of a shaft protruding from a bearing member with respect to a position of a head in the embodiment shown in FIG. 5;

FIG. 7 is an explanatory view of one centering state of the embodiment shown in FIG. 5;

FIG. 8 is an explanatory view of another centering state of the embodiment shown in FIG. 5;

FIG. 9 is an explanatory view showing a change in a state accompanying movement of a head in a second embodiment of the bearing centering method according to the present invention.

FIG. 10 is a view showing a change characteristic of a position of a shaft protruding from a bearing member with respect to a position of a head in the embodiment shown in FIG. 9;

FIG. 11 is an explanatory view of one centering state of the embodiment shown in FIG. 9;

FIG. 12 is an explanatory view of another centering state of the embodiment shown in FIG. 9;

[Explanation of symbols]

Wa: first bearing member, Wb: second bearing member, Wc: shaft, Sa: first bearing hole, Sb: second bearing hole.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kousuke Kurobe 1-1, Asahi-cho, Kariya-shi, Aichi Prefecture Inside Toyota Koki Co., Ltd. (72) Kotaro Yoshida 3-1-1, Oka, Shizuoka-shi, Shizuoka Mitsubishi Inside Electric Machinery Shizuoka Works (72) Inventor Sadami Okugawa 3-181-1, Oka, Shizuoka-shi, Shizuoka Mitsubishi Electric Works Co., Ltd. Shizuoka Works (72) Inventor Masatoshi Sakai 3-181, Oka, Shizuoka-shi, Shizuoka Inside Electric Machinery Shizuoka Works (72) Inventor Koji Ishijima 3-181-1, Oka, Shizuoka-shi, Shizuoka Mitsubishi Electric Works Co., Ltd. Shizuoka Works (72) Inventor Nobuyuki Tsuboi 3-181-1, Oka, Shizuoka-shi, Shizuoka Mitsubishi (56) References JP-A-57-71739 (JP, A) JP-A-57-71737 (JP, A) JP-A-57-129923 JP, A) (58) investigated the field (Int.Cl. ^6, DB name) B23P 19/02 B23P 21/00 306

Claims (1)

(57) [Claims] 1. A first bearing hole formed in a first bearing member, and a second bearing hole removably abutted and fixed to the first bearing member.
In a bearing centering method for centering a second bearing hole formed in a bearing member, one shaft is inserted into each bearing hole of the two bearing members slidably contacting each other, An elastic force is applied to a portion of the shaft protruding from one of the two bearing holes toward the axis from the side, and the shaft is brought into contact with at least two of the outer edges of the inner surfaces of the two bearing holes. The two bearing members are relatively moved in at least one direction in a state where the two bearing members are relatively moved during the movement, and the two bearing members are in the relative movement direction of the protruding portion of the shaft during the movement. while the amount of movement is measured relative to the, the amount of movement of the projecting portion with respect to the relative movement amount based on the measured result
Calculate the bending point of the change characteristic, calculate the relative movement amount at a position where the two bearing holes are centered based on the relative movement amount at the bending point and the movement amount of the protruding portion, A centering method of a bearing, characterized in that the two bearing members are relatively positioned at a position corresponding to the relative movement amount and the two bearing members are fixed.