JP2979756B2 - Gear backlash measurement device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for measuring the backlash of a gear, and more particularly to improvement of measurement accuracy.

[0002]

2. Description of the Related Art In a gear device, a first shaft having a first gear and a second shaft having a second gear are formed by a device body, the second shaft is horizontal, and the first gear and the second gear mesh with each other. Some are supported rotatably in the upright position. In this gear device, a backlash is required between the first and second gears. The magnitude of the backlash may cause a collision sound between the teeth, breakage of the gears, operation delay, and the like. It affects the quality of the gear system. Therefore, the backlash is measured, and the magnitude of the backlash is adjusted based on the measurement result. As an apparatus for measuring the backlash, for example, as described in Japanese Utility Model Application Laid-Open No. 62-162645, there is an apparatus for measuring by applying a rotational moment in both forward and reverse directions to a shaft of a gear by a weight. In this device, a second shaft having a second gear,
An arm is attached in a direction in which both ends extend from the axis of the second axis to both sides in plan view, a weight is suspended at one end of the arm, and a downward load is applied by a measurer to the other end, The rotation torque of the second shaft is measured. A displacement lever is attached to the arm at a right angle, and the displacement of the tip of the displacement lever, that is, the rotation angle of the second shaft is measured in association with the rotation torque. Rotational moments in both the forward and reverse directions are applied to the second shaft by the weight and the load applied by the measurer, but when the second shaft rotates by the backlash, the rotation torque hardly changes despite the large displacement of the displacement lever. Instead, based on the measurement result of the displacement of the displacement lever and the change in the rotational torque, the displacement amount in a state where the torque hardly changes can be obtained, and the backlash can be calculated from the displacement amount. If a forward and reverse rotational moment is applied to the second shaft by the weight and the downward load applied by the measurer in this way, the second shaft will rotate while hitting a fixed position of the bearing, Even if there is a gap between the two shafts and the bearing, the second shaft does not move in the bearing, and the backlash can be measured with little variation. The bearing that supports the second shaft is a plain bearing, and there is a gap between the second shaft and the bearing, so that the second shaft moves in the bearing. This movement is stopped by the oil film formed in the gap, but there is variation in the position where the second axis is stable, and the variation results in variation in the measured value of backlash, whereas the weight and the operator When a downward load is applied, the second axis is stabilized at a fixed position, and the backlash can be measured with little variation.

[0003]

However, in this backlash measuring device, the first and the second
It is impossible or difficult to measure the backlash at multiple locations on the second gear. Backlash is caused by manufacturing errors and assembly errors, but usually differs depending on the position where the two gears mesh. Even if only one backlash is measured, the backlash of the gears is appropriate. I do not know whether it is. 62-1
Japanese Patent No. 62645 does not disclose a device for rotating the first and second gears to a plurality of measurement positions or a device for fixing an arm to which a load is applied at a plurality of measurement positions. SUMMARY OF THE INVENTION In view of such circumstances, an object of the present invention is to provide an apparatus that can easily measure the backlash of a gear at a plurality of locations.

[0004]

SUMMARY OF THE INVENTION A gear backlash measuring apparatus according to the present invention has the following objects.
(A) a supporting device that supports the gear device main body, (b) a rotation driving device that rotates a first shaft of the gear device supported by the supporting device, and (c) rotation that is rotated by the rotation driving device. A fixing device for fixing the first shaft in the position,
(D) an elevating member capable of moving vertically with respect to the supporting device, and a swinging member mounted on the elevating member such that both ends thereof extend in a plan view to both sides from the axis of the second shaft of the gear device. A chuck attached to the swinging member for gripping and releasing the second shaft, a load device for alternately supporting weights at both ends of the swinging member, and lowering the lifting member with the chuck gripping the second shaft. A moment imparting device that has a lifting drive device that causes the swing member to swing in a swingable state, and that causes the second shaft to alternately act on the second shaft based on the weight of the weight. And (e) an angle detecting device for detecting a rotation angle of the second shaft between a state in which a forward rotational moment is applied by the moment applying device and a state in which a reverse rotational moment is applied by the moment applying device. Including Configured.

[0005]

In the backlash measuring device thus constructed, the first shaft is rotated in a state where the gripping of the second shaft by the chuck is released and the fixing of the first shaft by the fixing device is released, and the first shaft is rotated. , The second gear is rotated to a predetermined backlash measurement position. After rotation, the first shaft is fixed by the fixing device, the second shaft is gripped by the chuck and the elevating member is lowered, and the swinging member is supported by the second shaft and can rotate integrally with the second shaft. State. In this state, if the weight is alternately supported at both ends of the swinging member, the swinging member swings, and a rotational moment is applied to the second shaft via the swinging member, so that the second shaft rotates by the amount of backlash. Then, the rotation angle is detected by the angle detection device, and the backlash is measured. If the backlash is measured, the lifting member is raised, the gripping of the second shaft by the chuck is released, and the first shaft is rotatable when the fixing of the first shaft by the fixing device is released. In this state, the first and second gears are rotated to the next backlash measurement position by the rotation driving device, and the backlash is measured.

[0006]

As described above, according to the backlash measuring apparatus of the present invention, the forward and reverse rotational moments are applied to the second shaft by the weight, and the backlash is measured by detecting the rotational angle. In addition, the second shaft does not move in the bearing during the measurement, and the backlash can be measured with little variation. In addition, both the forward and reverse rotational moments are applied to the second shaft by weights, so that the device can be easily configured and the magnitude of the load to be applied in both the forward and reverse directions can be accurately determined. And the backlash can be measured with less variation. Further, the fixing of the first shaft by the fixing device is released, the gripping of the second shaft by the chuck is released, the first shaft is rotated, and the first and second gears are rotated to predetermined measurement positions to reduce the backlash. The backlash can be measured at a plurality of locations quickly and easily.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An apparatus for measuring backlash in a gear device including a crankshaft, a balance shaft of an engine and a gear provided on the engine will be described below in detail with reference to the drawings.

In FIG. 5, reference numeral 10 denotes a crankshaft. The crankshaft 10 has four crankpins 1
The crank journal 14 includes two and five crank journals 14 and four sets of balance weights 16, and is rotatably supported by the blocks 18 on the crank journal 14. The block 18 has a schematic shape indicated by a two-dot chain line. A gear 20 is integrally attached to the crankshaft 10 and meshes with a gear 26 attached to the first balance shaft 24. The first balance shaft 24 is rotated about an axis parallel to the axis of the crankshaft 10 by a frame 28 (only a schematic shape is indicated by a two-dot chain line) mounted on the block 18 via a regular shim 27. 6, the gear 26 is a gear 2 of the crankshaft 10 as shown in FIG.
In addition to 0, it is meshed with the gear 32 of the second balance shaft 30. The gear 26 and the gear 32 have different tooth widths,
The gear 32 is meshed with the gear 26 at a position shifted in the axial direction from the gear 20 of the crankshaft 10, and the gears 32 and 20 do not mesh with each other.

The first and second balance shafts 24,
Each of the weights 30 is attached with a weight (not shown). These first and second balance shafts 24, 30
Are for removing secondary vibrations generated during operation of the engine, and are rotatably supported by bearings attached to the frame 28 at their shaft portions. The tooth surfaces of the gears 26 and 32 are slightly deviated from the axes of the first and second balance shafts 24 and 30 due to manufacturing errors thereof, manufacturing errors of the first and second balance shafts 24 and 30, assembly errors, and the like. The first and second balance shafts 24, 3 are positioned at positions where the tooth surfaces are closest to the axis.
0 is attached to the shaft.

The crankshaft 10 functions as a first shaft having a gear 20 as a first gear, the first balance shaft 24 functions as a second shaft having a gear 26 as a second gear, and a block 18 and a frame 28. Constitutes a gear device main body 34, a crankshaft assembly 37 in which the crankshaft 10 is supported by the block 18, and a balance shaft assembly 38 in which the first and second balance shafts 24, 30 are supported by the frame 28. Are assembled via the normal shim 27 to form the gear device 36.

Next, a backlash measuring device 46 for measuring the backlash of the gears 20, 26 of the gear device 36 will be described. As shown in FIG. 1, the measuring device 46 is provided with a support 54 as a supporting device for supporting the gear device 36. The gear device 36 is transported by a transport device (not shown) in a posture in which the axes of the crankshaft 10 and the first balance shaft 24 are parallel to the transport direction (the left-right direction in FIG. 1), and is loaded onto the support 54. After being carried in, the support table 54 is raised, and the gear device 36 is positioned by the positioning jig and lifted from the transport device.

As shown in FIG. 1, the measuring device 46 has an elevating table 56 which can be moved up and down on an apparatus main body (not shown). The elevating table 56 is configured to be moved up and down by an air cylinder (not shown), and a rotation drive device 58 and a fixing device 60 are attached to the lower surface thereof. The frame 62 of the rotary drive device 58 is
Are slidably fitted to a pair of guide rails 64 (only one is shown in the figure) fixed to the lower surface of the drive shaft, and are moved by a drive cylinder 66 in a direction parallel to the axis of the crankshaft 10. And is moved toward and away from the crankshaft 10 supported by the support 54. A rotation drive motor 68 is attached to the frame 62, and an engagement member 72 is attached to an output shaft of the frame 62 via an Oldham coupling 70 so that the engagement member 72 is engaged with one end of the crankshaft 10 so that it cannot rotate relatively. ing. Rotary drive motor 6
Reference numeral 8 denotes an AC servomotor whose rotation position is detected by an encoder 71 fixed to the rotation drive motor 68. Further, the engagement between the engagement member 72 and the crankshaft 10 is detected by the detection device 73. The frame 74 of the fixing device 60 is slidably fitted on a fixed guide rail 76 on the lower surface of the elevating platform 56, and is moved in a direction parallel to the axis of the crankshaft 10 by a moving device (not shown). A clamper 78 is attached to the frame 74, and grips the other end of the crankshaft 10 so that it cannot rotate.

A moment applying device 80 and an angle detecting device 82 are provided at a portion between the rotary driving device 58 and the fixing device 60 of the elevating platform 56. Hereinafter, these devices 80 and 82 will be described in detail with reference to FIGS. First, the moment applying device 80 will be described. As shown in FIG. 2, a rectangular opening 86 is formed in the lift 56, and a support plate 88 is fixed to the lower surface of the lift 56 to close the opening 86. This support plate 88 has four columns 9
0 are erected, and a mounting plate 92 is fixed to the ends of the columns 90. A holding cylinder 94 is fixed downward on the mounting plate 92, and its piston rod 9
6 penetrates through the mounting plate 92, and a pressing plate 98 is fixed to the protruding end so as to be relatively immovable in the axial direction, and is moved up and down by expansion and contraction of the piston rod 96. Two guide pins 100 are erected on the holding plate 98 and fitted to the mounting plate 92 so as to be slidable in the axial direction, and guide the lifting and lowering of the holding plate 98. Also, the holding plate 9
8, holding bolts 102 are screwed downward at two positions of the gear device 36 supported by the support 54 and separated from each other in a direction parallel to the axis of the first balance shaft 24. A through hole 104 is formed in the mounting plate 92 at a position corresponding to the holding bolt 102, and the holding plate 98 is formed.
When the is lifted and lowered, the holding bolt 102 and the mounting plate 92 do not interfere with each other.

A pair of seats 110 are fixed to the support plate 88 concentrically with the pair of holding bolts 102. A through-hole 112 is formed in the seat 110 and penetrates in the vertical direction. The upper side of the through-hole 112 is a tapered hole 114 whose diameter increases upward. A rod 116 is fitted into each of the through holes 112 of the seat 110 with a gap in the radial direction. At the upper end of the rod 116, an engagement block 118 is attached.
8 has a tapered portion 120 corresponding to the tapered hole 114. A mounting plate 124 is fixed to lower ends of these rods 116, and three pressing members 126 (only two are shown in the figure) are fixed to the lower surface of the mounting plate 124, and the gear device 36 is fixed. The block 18 is pressed against the support table 54 by being in contact with the frame 28 of FIG. An engagement projection 128 is provided on the lower surface of the holding member 126 so as to bite into the frame 28 that supports the first and second balance shafts 24 and 30.

An elevating plate 130 is fitted to the rod 116 via a bearing 132 so as to be relatively movable in the axial direction. The lifting plate 130 is moved by a spring 136 disposed between the lifting plate 130 and a sleeve 134 fitted to the rod 116.
It is urged away from the mounting plate 124. A pair of engaging members 140 (only one is shown in the figure) are fixed to the lower surface of the portion between the pair of rods 116 of the lifting plate 130, and the lifting cylinder 144 fixed on the mounting plate 124. Piston rod 146 is engaged.
The engagement member 140 is formed by dividing a bottomed cylindrical member into two along a straight line, and is fixed to a protruding end of the piston rod 146 in a circular gap formed between the bottom and the elevating plate 130. The circular engagement plate 148 is fitted so as not to be able to come out leaving a gap in the axial direction, and the elevating plate 130 is moved up and down by expansion and contraction of the piston rod 146.
A contact block 152 is fixed on the elevating plate 130 so as to extend upward, and abuts on a pin 154 provided on the support plate 88 downward.

The first balance shaft 24 of the lifting plate 130
A support plate 158 is fixed to one of the two ends separated in a direction parallel to the axis of. As shown in FIG. 3, mounting plates 160 and 162 are fixed to both ends of the support plate 158 in a direction orthogonal to the axis, and two connecting rods 164 and 166 are respectively parallel to the axis. It is fixed in such a direction as to extend downward at a distance in a desired direction. These two connecting rods 164, 166
Are connected by connecting plates 168 and 170, respectively. These support plate 158, mounting plate 160, 1
62, connecting rods 164, 166 and connecting plate 168,
170 is moved up and down as the elevating plate 130 moves up and down,
An elevating member is constituted together with the elevating plate 130, and the elevating cylinder 144 constitutes an elevating drive device.

A swinging plate 174 as a swinging member is mounted on the connecting plates 168 and 170, and both ends thereof extend to both sides from the axis of the first balance shaft 24 in plan view. ing. Connecting plates 168, 170
A conical positioning pin 176 is provided on each of the upper portions, and positioning holes 17 formed in the rocking plate 174 are provided.
8 to position the rocking plate 174. Further, conical positioning pins 182 are provided on the swinging plate 174 at both ends separated in the longitudinal direction.

At the center of the swing plate 174, a chuck 1
90 are attached. The chuck 190 has a pair of arms 192 rotatably mounted around an axis parallel to the axis of the first balance shaft 24, and a pair of links 19 at upper ends of the arms 192.
4, 196 are rotatably mounted, and the other ends of the links 194, 196 are rotatably connected. The chuck opening / closing cylinder 20 is provided on the swing plate 174.
0 is fixed upward, and a link 194 is attached to a block 204 engaged with the distal end of the piston rod 202.
The other end of the arm 196 is rotatably connected, and the arm 192 is rotated by expansion and contraction of the piston rod 202, and the gripping claw 20 attached to the lower end of the arm 192 is rotated.
6 is opened and closed to grip the first balance shaft 24,
release. The links 194 and 196 constitute a toggle mechanism, and the gripping pawl 206 is moved by the first balance shaft 24 by a relatively small operation of the chuck opening / closing cylinder 200.
Grip strongly.

Reference numeral 208 denotes an engagement pin protruding from the block 204, which is fitted into a through hole 212 provided in a regulating plate 210 fixed to the support plate 158. The engagement pin 208 has a cylindrical end at the proximal end and a tapered end at the distal end. When the chuck 190 does not grip the first balance shaft 24, the piston rod 202 is in the extended end position, The pin 208 fits into the through hole 212 to the base end to prevent the chuck 190 from rattling. When the chuck 190 grips the first balance shaft 24,
As the piston rod 202 is contracted, the tip of the engaging pin 208 is fitted into the through hole 212, and the gap between the engaging pin 208 and the through hole 212 allows the chuck 190 to swing.

Elevating cylinders 220 and 222 are fixed downward on the mounting plates 160 and 162, respectively, and weights 228 and 230 are relatively movable in the axial direction at the lower ends of the piston rods 224 and 226, respectively. Suspended. The weights 228 and 230 have the same configuration, and the weight 228 will be representatively described.

The weight 228 is connected to the first part 232 engaged with the piston rod 224 by a pin 234, and is positioned on the rocking plate 174 and mounted on the second part 236. Consisting of First part 23
2, a through hole 238 is formed to penetrate in the axial direction. The through-hole 238 has a stepped shape, and the small-diameter hole 2
A tapered hole portion 244 is formed between 40 and the large-diameter hole portion 242, and the piston rod 224 is fitted to the through hole 238 so as to be relatively movable in the axial direction, and is provided at the lower end thereof. The tapered portion 246 engages the tapered hole portion 244 and suspends the weight 228. Also, the second part 236
Is formed with a conical positioning hole 248 that is open on the lower surface thereof. These weights 228 and 230 are separated from the rocking plate 174 when the piston rods 224 and 226 are contracted, and the piston rods 224 and 226 are separated.
In a state of being suspended by the piston rod 2
If 24 and 226 are extended, positioning pins 182
And is positioned. Piston rods 224,2
If 26 is further extended from that state, the tapered portion 2
46 are separated from the tapered hole 244 by weights 228 and 23.
0 is supported by the rocking plate 174 via the positioning pin 182. Lifting cylinders 220, 22
2, the weights 228 and 230 constitute a load device.

Next, the angle detecting device 82 will be described.
As shown in FIG. 2, the angle detecting device 82
The first balance shaft 24 is provided on the opposite side to the moment applying device 80 in a direction parallel to the axis of the first balance shaft 24. As shown in FIG. 4, the angle detecting device 82 includes a support plate 250 fixed to the elevating plate 130 and mounting plates 252 and 25 fixed to the support plate 250, similarly to the moment applying device 80.
4, two connecting rods 25 respectively attached to the mounting plates 252 and 254 so as to extend downward.
6,258 and connecting plates 260,262 connecting the lower ends of the connecting rods 256,258.
It has an elevating member that moves up and down together with the up and down movement of 30.

A swing plate 264 is provided on the connection plates 260 and 262.
And a chuck 270 is provided. The chuck 270 has a pair of arms 272 and a pair of links 274 and 276 similarly to the chuck 190 of the moment applying device 80. These links 27
4, 276 is rotatably connected to a block 282 engaged with a piston rod 280 of a chuck opening / closing cylinder 278 fixed on a swinging plate 264. Arm 272
Is rotated, and the gripping claws 284 respectively attached to the lower ends thereof are opened and closed, so that the first balance shaft 2 is rotated.
4. Grasp and release the other end of 4. An engaging pin 286 is provided upright on the block 282 and is fitted into a through hole 290 provided in a defining plate 288 fixed to the support plate 250 so as to prevent the chuck 270 from rattling. Have been.

As shown in FIG. 2, a detection body 300 is provided upright at a portion of the swinging plate 264 on the side of the lifting plate 130.
The detection body 300 extends upward from the rocking plate 264, and is bent toward the lifting plate 130 side.
Of the magnescale 3 at a position facing the detection body 300 in the direction orthogonal to the axis of the first balance shaft 24.
04 is attached. The tracing stylus 306 of the magnescale 304 is urged by urging means (not shown) and is brought into contact with the detection body 300, and moves following the detection body 300 when the swing plate 264 swings. The position of the detection object 300 is detected.

Next, measurement of backlash will be described. At the time of non-measurement, the lift 56 is at the rising end position, and the rotary drive 58, the fixing device 60, and the moment applying device 8
The zero and angle detection device 82 is located above the support table 54, and the rotary drive device 58 and the fixing device 60 are respectively at the retracted end positions farthest from the support table 54. Further, the tapered portion 12 of the engagement block 118 of the rod 116
0 is engaged with the tapered hole 114, and the moment applying device 80
And an angle detecting device 82 are suspended from the elevating table 56, and the chucks 190, 270 of the devices 80, 82 are suspended.
Is open.

Then, the gear device 36 is carried in, the support 54 is raised to a predetermined measurement position, and the gear device 36
Is positioned on the support 54, the lift 56 is lowered to the lower end. With the lowering of the elevating table 56, the holding member 126 is lowered, and the frame 2 of the gear device 36 is moved.
Contact 8 The elevating platform 56 is further lowered a small distance even after the pressing member 126 contacts the frame 28. This descent is allowed by the relative movement of the rod 116 and the elevating platform 56, and the elevating platform 56 is In a state where the rod is lowered to the lower end, the engagement block 118 is detached from the tapered hole 114, and the rod 116 is separated from the lift 56.

When the elevator 56 descends, the elevator 130 supported by the mounting plate 124 via the spring 136 also descends. Then, the pressing member 126
After the mounting plate 124 stops due to the contact of the mounting plate 124 with the frame 28, the pin 154 contacts the contact block 152 to compress and lower the spring 136. It is lowered to a position determined based on the lower end position of 56. During this time, the chuck 19 of the moment applying device 80 and the angle detecting device 82
When the lowering of the elevating plate 130 is stopped, the axes of the chucks 190 and 270 are slightly lower than the axis of the first balance shaft 24. Below. After the elevating table 56 has been lowered to the lower end, the holding plate 98 is lowered by the holding cylinder 94, and the holding bolts 10.
2 pushes the rod 116 downward, the engaging projection 128 projecting from the lower surface of the pressing member 126 is cut into the upper surface of the frame 28, and the pressing member 126 presses the frame 28 and the block 18 against the support base 54. Can be

When the elevator 56 is lowered to the lower end, the axis of the engagement member 72 of the rotary drive device 58 and the fixing device 60 and the axis of the clamper 78 are further aligned with the crankshaft 1.
It becomes a state that almost coincides with the 0 axis. Then, first, the drive cylinder 66 is extended toward the crankshaft 10, and after the engaging member 72 is engaged with one end of the crankshaft 10, the rotation drive motor 68 is rotated,
Crankshaft 10 and first balance shaft 24
Is rotated to rotate the gears 20 and 26 to a predetermined backlash measurement position. Since the engaging member 72 is attached to the rotation drive motor 68 via the Oldham coupling 70, even if the rotation axis of the rotation drive motor 68 and the axis of the crankshaft 10 are misaligned, the crankshaft 10 rotates without hindrance. Let me do. After rotation, clamper 7
8 is advanced to grip the other end of the crankshaft 10 and fix the crankshaft 10 at the backlash measurement position.

When the lift 56 is moved down to rotate the crankshaft 10 and the first balance shaft 24 to the backlash measurement position and the frame 28 and the block 18 are pressed by the pressing member 126, the chuck 190 and 270 are closed to grip both ends of the first balance shaft 24, respectively. As described above, since the axes of the chucks 190 and 270 are slightly lower than the axis of the first balance shaft 24, when the chucks 190 and 270 are closed, they rise slightly, and the swing plates 174 and 264 are moved. Are slightly lifted from the connecting plates 168, 170, 260, 262, respectively. However, the rocking plates 174 and 264 to which the chucks 190 and 270 are attached are generally slightly inclined, and one of both ends in the longitudinal direction is connected to the connecting plate 168 or 170 and the connecting plate 260 or 26, respectively.
2 is supported. Then, from this state, the elevating plate 130 is lowered by the elevating cylinder 144, and the connecting plates 168, 170, 260, 262 are lowered, so that the rocking plates 174, 264 are in a state where they can be rocked by a sufficient angle. At the same time, rocking plates 174, 264 and chucks 19 are provided at both ends of the first balance shaft 24, respectively.
0, 270, the weights of the chuck opening / closing cylinders 200, 278, etc. are added downward.

Next, of the two weights 228 and 230, first, the weight 228 is lowered and the rocking plate 174 is moved.
3 and a clockwise rotational moment is applied to the first balance shaft 24 in FIG. As a result, if the first balance shaft 24 rotates in the same direction,
The swing plate 264 attached to the other end of the first balance shaft 24 swings, and the detector 300 swings,
The position is measured by the magnescale 304.
After this measurement, the weight 228 is raised,
The other weight 230 is lowered and supported by the swing plate 264, and a counterclockwise rotational moment is applied to the first balance shaft 24. In this case, the swing plate 26
4 oscillates in the opposite direction, and the position of the detector 300 at that time is measured by the magnescale 304. Thus, when the rotational moment in both the forward and reverse directions is applied to the first balance shaft 24, the detector 300 Backlash is calculated based on the change in position.

The backlash BL is the portion shown in FIG. 7 and is represented by the following equation. BL = B · MGSD / 2 · LARM where MGSD: the position of the detector 300 when the teeth abut on each other when a positive rotational moment is applied to the first balance shaft 24, and the reverse rotation The distance between the teeth and the position of the detection body 300 when the teeth contact each other when a moment is applied. B: The diameter of the pitch circle of the gear 26. LARM: Measurement of the axis of the first balance shaft 24 and the magnescale 304. If the rotation angle when the first balance shaft 24 rotates by the backlash BL is θ, the backlash BL is B
L = (B / 2) · θ, distance MGSD is MGSD = LAR
M · θ, and the above equation is obtained from these equations.
B and LARM are known values, and
MGSD is a value obtained by measuring the magnescale 304, and the backlash BL can be obtained from B, LARM, and MGSD.

When the backlash BL is measured in this way, the lifting plate 130 is raised and the swing plate 17
The swingable angles of 4,264 are connected plates 168,1 respectively.
After being limited by 70, 260, 262, the gripping of the first balance shaft 24 by the chucks 190, 270 is released, and the swing plates 174, 264 are connected to the connecting plate 168,
170, 260, 262 and the like. In this state, the crankshaft 1
0 is released, the crankshaft 10 and the first balance shaft 24 are rotated, the gears 20, 26 are rotated to the next backlash measurement position, and the backlash is measured again.

As described above, in the backlash measuring device of this embodiment, the weight 22 is attached to the first balance shaft 24.
The backlash is measured by applying rotational moments in both the forward and reverse directions by the first and second rotating shafts 8 and 230. The first balance shaft 24 is composed of the weights 228 and 230 and the respective swing plates 17 of the moment applying device 80 and the angle detecting device 82.
4,264, chucks 190,270, etc.,
A fixed position (lowest position) of the bearing provided on the frame 28
, And its axial position does not vary,
Backlash is accurately measured. Particularly, in the present embodiment, the moment applying device 80 and the angle detecting device 82
Are provided at both ends of the first balance shaft 24, so that the first balance shaft 24 does not tilt even when the swing plates 174, 264 are supported by the first balance shaft 24, It is pressed to the lowest position on both ends of the bearing. Further, by rotating the crankshaft 10 and the first balance shaft 24 in a state where the grippers 78 and the chucks 190 and 270 of the crankshaft 10 and the first balance shaft 24 are released, the gears 20 and 26 can be measured for a plurality of backlashes. Position, and backlash can be easily measured at a plurality of locations. Furthermore, if the moment applying device 80 and the angle detecting device 82 are integrally provided, if the chuck 190 slips when applying a rotational torque to the first balance shaft 24 via the rocking plate 174, The slip is detected as backlash, whereas in the present embodiment, since the moment applying device 80 and the angle detecting device 80 are separately provided, even if the chuck 190 slips, the detecting member 300 Does not swing, an error due to slippage is avoided, and backlash can be measured accurately.

In the above embodiment, the rotation driving device 5
8 and the fixing device 60 are provided separately from the gear device 36, but the gear device has a rotation driving device for rotating the first and second gears meshing with each other and a fixing device for fixing the first shaft. Alternatively, the first shaft may be rotated to a plurality of backlash measurement positions by the rotation driving device and the fixing device, and may be fixed at the positions. In this case, the rotation driving device and the fixing device of the gear device are used as a part of the backlash measuring device.

The means for detecting the rotation angle of the first balance shaft 24 at the time of measuring the backlash is not limited to the one in the above-described embodiment. Or the rotation angle of the first balance shaft 24 itself may be determined as an amount corresponding to the magnitude of the backlash one-to-one. For example, when the pass / fail of the gear device is determined based on the magnitude of the backlash, it is sufficient to compare the displacement of the detection body 300 and the rotation angle of the first balance shaft 24 with the determination reference value.

Further, at the time of backlash measurement in the above embodiment, the chucks 190 and 270 and the swing plates 174 and 26 are provided at both ends of the first balance shaft 24, respectively.
Although a weight such as 4 has been added, if it is still insufficient, a holding member may be provided to press the first balance shaft 24 against the bearing.

In addition, without departing from the scope of the claims, the present invention can be implemented in various modified and improved forms based on the knowledge of those skilled in the art.

[Brief description of the drawings]

FIG. 1 is a front view showing a backlash measuring device according to an embodiment of the present invention.

FIG. 2 is an enlarged front view showing a main part of the backlash measuring device.

FIG. 3 is a front view (partial cross section) showing a moment applying device of the backlash measuring device.

FIG. 4 is a front view showing an angle detection device of the backlash measurement device.

FIG. 5 is a front view showing a crankshaft and a balance shaft of an engine provided with gears whose backlash is measured by the backlash measuring device.

FIG. 6 is a view schematically showing meshing between a gear of the crankshaft and a gear of the balance shaft.

FIG. 7 is a diagram illustrating calculation of backlash by the backlash measurement device.

[Explanation of symbols]

 Reference Signs List 10 crankshaft 20 gear 24 first balance shaft 26 gear 34 device main body 36 gear device 54 support base 58 rotation drive device 60 fixing device 80 moment applying device 82 angle detecting device 130 elevating plate 144 elevating cylinder 158 support plate 160 mounting plate 162 Mounting plate 164 Connecting rod 166 Connecting rod 168 Connecting plate 170 Connecting plate 174 Rocking plate 190 Chuck 220 Elevating cylinder 222 Elevating cylinder 228 Weight 230 Weight 300 Detector 304 Magnescale

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shunichi Ishikawa 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (72) Inventor Tadashi Kumazawa 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation ( 72) Inventor Toshihiro Yamada 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (58) Field surveyed (Int. Cl. ⁶ , DB name) G01M 13/02

Claims (1)

(57) [Claims] A first shaft having a first gear and a second shaft having a second gear are rotated by the apparatus main body in a state where the second shaft is horizontal and the first gear and the second gear mesh with each other. What is claimed is: 1. A device for measuring backlash between a first gear and a second gear of a gear device that is supported, comprising: a support device that supports the gear device main body; and a gear device that is supported by the support device. A rotation driving device that rotates the first shaft, a fixing device that fixes the first shaft at a rotation position rotated by the rotation driving device, an elevating member that is vertically movable relative to the support device, A swinging member mounted on the elevating member such that both ends thereof extend in both directions from the axis of the second shaft in a plan view, a chuck attached to the swinging member to grip and release the second shaft, Weights are alternately applied to both ends of the swinging member. A load device to be held, and a lifting / lowering drive device that lowers the lifting / lowering member while the chuck grips the second shaft to make the swinging member swingable, based on the weight of the weight. A moment applying device that alternately applies a forward rotational moment and a reverse rotational moment to the second shaft; and a state in which a forward rotational moment is applied by the moment imparting device and a reverse rotational moment. A backlash measuring device for a gear, comprising: an angle detecting device that detects a rotation angle of the second shaft between a state in which the second shaft is actuated.