Positioning device for measuring rotation precision of cylindrical roller bearing

Abstract

The utility model discloses a positioning device for measuring the rotation precision of a cylindrical roller bearing. The positioning device comprises a positioning sleeve, a conical disc, a central shaft and a cover plate. The positioning sleeve comprises a top plate and a plurality of sleeves connected to the bottom surface of the top plate; the inner diameter face of the sleeve is a circular truncated cone face and is defined by a plurality of clamping jaws. The outer diameter surface of the conical disc is a circular truncated cone surface and a copper sleeve is embedded in the conical disc; the central shaft comprises an optical shaft, a convex ring and a threaded shaft; the positioning sleeve is arranged in the bearing inner ring; the conical disc is inserted into an inner cavity of the sleeve from the bottom of the positioning sleeve, the central shaft is inserted into the positioning sleeve from the top until the threaded shaft is screwed into a threaded inner hole of the copper sleeve, the convex ring is clamped by a top plate of the positioning sleeve, and the cover plate sleeves an optical shaft of the central shaft and is mounted on the top plate of the positioning sleeve through a plurality of screws, so that the central shaft cannot axially move and only can rotate; by rotating the center shaft, the conical disc moves upwards and extrudes the multiple clamping jaws to expand in the radial direction, and the sleeve reversely clamps the bearing inner ring and the inner ring loose rib. According to the utility model, the problem of difficult measurement is effectively solved.

Description

Technical Field

[0001] The utility model relates to a positioning device for measuring the rotation accuracy of cylindrical roller bearings. Background Art

[0002] At present, domestic bearing rotation accuracy measuring devices all adopt the method of fixing one race of the bearing (the race includes the bearing outer race and the bearing inner race), applying an axial force Fa perpendicular to the bearing end face by mounting a load block on the reference end face of the other race of the bearing, and then manually rotating the race for more than one week to read the indication difference of the indicating gauge to obtain the rotation accuracy value of the bearing. When measuring the rotation accuracy of the complete set of inner rings (inner rings with single-sided flat retaining rings) of cylindrical roller bearings, the reference end face of the outer race needs to be supported on a platform with a guide to fix and center the outer race, and then a stable central axial load is applied to the reference end face of the inner race to ensure mutual contact between the working surfaces of the bearings. For subway axle box bearings, since the bearing inner race and the inner ring flat retaining ring of this kind of bearing are of a split structure. When measuring the rotation accuracy of this kind of bearing, since the bearing inner race cannot be supported alone, a locking tooling needs to be used to lock the bearing inner race and the inner ring flat retaining ring together before the rotation accuracy measurement can be carried out. At the same time, when measuring, the bearing inner race needs to be rotated smoothly for several weeks, which is difficult to complete by manual operation of the operator. Summary of the Utility Model

[0003] The purpose of the utility model is to overcome the defects of the prior art and provide a positioning device for measuring the rotation accuracy of cylindrical roller bearings, which effectively solves the problem of difficult measurement of the rotation accuracy of bearings with a split structure of the bearing inner race and the inner ring flat retaining ring.

[0004] The purpose of the utility model is realized as follows: A positioning device for measuring the rotation accuracy of cylindrical roller bearings includes a positioning sleeve, a cone plate, a central shaft and a cover plate; wherein,

[0005] The positioning sleeve includes a circular top plate and a plurality of sleeves connected to the bottom surface of the top plate circumferentially and evenly; a central shaft through hole is opened at the center of the surface of the top plate, and a plurality of internal threaded holes are opened circumferentially and evenly on the surface of the top plate around the central shaft through hole; the outer diameter surface of the sleeve is a cylindrical surface and the diameter is adapted to the inner diameter of the bearing inner race, and the inner diameter surface of the sleeve is a frustum of a cone with a smaller upper part and a larger lower part, and the sleeve is formed by a plurality of sector-shaped clamping jaws.

[0006] A connection hole leading to the bottom surface is opened at the center of the top surface of the cone plate, and a copper sleeve with an internal threaded hole and a bottom retaining edge is inlaid in the connection hole; the outer diameter surface of the cone plate is a frustum of a cone with a smaller upper part and a larger lower part, and the outer diameter of the upper end of the cone plate is smaller than the inner diameter of the lower end of the sleeve of the positioning sleeve, and the outer diameter of the lower end of the cone plate is larger than the inner diameter of the lower end of the sleeve of the positioning sleeve.

[0007] The upper part of the central shaft is a smooth shaft, and the lower part is a threaded shaft that meshes with the internal threaded hole of the copper sleeve on the conical disc. A convex ring is provided between the smooth shaft and the threaded shaft;

[0008] A stepped central shaft through-hole that is smaller at the top and larger at the bottom is provided at the center of the cover plate, and a number of counterbored through-holes corresponding one by one to the several internal threaded holes on the positioning sleeve are evenly distributed in the circumferential direction around the central shaft through-hole; the inner diameter of the upper part of the central shaft through-hole is adapted to the outer diameter of the smooth shaft of the central shaft, and the inner diameter of the lower part of the central shaft through-hole is adapted to the outer diameter of the convex ring of the central shaft;

[0009] The positioning sleeve is arranged in the inner ring of the bearing; the conical disc is inserted into the inner cavity of the sleeve of the positioning sleeve from the bottom of the positioning sleeve, and the central shaft is inserted into the central shaft through-hole from the top of the positioning sleeve until the threaded shaft of the central shaft is screwed into the threaded inner hole of the copper sleeve, and the convex ring of the central shaft is caught by the top plate of the positioning sleeve. The cover plate is sleeved on the smooth shaft of the central shaft through the central shaft through-hole and is installed on the top surface of the top plate of the positioning sleeve by a number of screws, so that the central shaft cannot move axially but can only rotate. By rotating the central shaft, the conical disc moves upward and squeezes a number of jaws of the sleeve of the positioning sleeve to radially expand, so that the sleeve reversely clamps the inner ring of the bearing and the inner ring flat retainer.

[0010] In the above positioning device for measuring the rotation accuracy of a cylindrical roller bearing, a number of external threaded holes are evenly distributed in the circumferential direction on the surface near the edge of the top plate of the positioning sleeve, and a limit screw is installed in each external threaded hole.

[0011] In the above positioning device for measuring the rotation accuracy of a cylindrical roller bearing, a number of arc-shaped grooves are radially distributed evenly on the outer diameter surface of the top plate of the positioning sleeve.

[0012] In the above positioning device for measuring the rotation accuracy of a cylindrical roller bearing, the outer diameter surface of the conical disc is divided into an upper outer diameter surface and a lower outer diameter surface, and the cone angle of the upper outer diameter surface is greater than the cone angle of the lower outer diameter surface of the conical disc.

[0013] In the above positioning device for measuring the rotation accuracy of a cylindrical roller bearing, a handwheel is also sleeved on the smooth shaft of the central shaft through a pin.

[0014] The positioning device for measuring the rotation accuracy of a cylindrical roller bearing of the present utility model is characterized in that: it makes the outer diameter of the positioning sleeve expand by the way of squeezing while axially moving the conical disc with a round table surface on the outer diameter surface, so as to clamp the inner diameter of the inner ring of the bearing and the inner ring flat retainer; at the same time, the positioning device also applies a central axial load to the inner ring to ensure that the inner ring flat retainer is in contact with the rolling elements; the measurer can also perform the operation of rotating the inner ring of the bearing through the handwheel on the positioning device. The positioning device of the present utility model effectively solves the problem of difficult measurement of the rotation accuracy of a bearing in which the inner ring of the bearing and the inner ring flat retainer are of a split structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is an axial cross-sectional view of the positioning device for measuring the rotation accuracy of a cylindrical roller bearing according to the present invention;

[0016] Figure 2 This is an axial cross-sectional view of the positioning sleeve in the positioning device of the present utility model;

[0017] Figure 3 yes Figure 2 Bottom view of

[0018] Figure 4 It is an axial cross-sectional view of the positioning device of the utility model during measurement. DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the accompanying drawings.

[0020] See also Figures 1 to 4 The utility model discloses a positioning device for measuring the rotation accuracy of a cylindrical roller bearing, comprising a positioning sleeve 1, a tapered disk 2, a center shaft 3, a cover plate 4 and a hand wheel.

[0021] The positioning sleeve 1 includes a circular top plate 11 and several sleeves 12 evenly connected to the bottom surface of the top plate 11 along the circumference; wherein, a central axis through hole 101 is opened at the center of the surface of the top plate 11, four internal threaded holes 102 are evenly opened on the surface of the top plate 11 on the outer circumference of the central axis through hole 101, and three external threaded holes 103 are evenly opened on the surface near the edge of the top plate 11, and a limit screw 10 is installed in each external threaded hole 103; six arc grooves 104 are evenly distributed radially on the outer diameter surface of the top plate 11; the outer diameter surface of the sleeve 12 is a cylindrical surface and its diameter is adapted to the inner diameter of the bearing inner ring 111 or the inner diameter of the inner ring flat retaining ring 112. The inner diameter surface of the sleeve 12 is a frustum surface with a smaller upper part and a larger lower part. The sleeve 12 is surrounded by six fan-shaped jaws 120, and the six jaws 120 are staggered with the six arc grooves 104 on the top plate 11.

[0022] A connecting hole extending to the bottom surface is opened at the center of the top surface of the conical disk 2, and a copper sleeve 20 with an internal threaded inner hole and a bottom rib is embedded in the connecting hole; the outer diameter surface of the conical disk 2 is a frustum surface with a smaller upper portion and a larger lower portion, and the outer diameter of the upper end of the conical disk 2 is smaller than the inner diameter of the lower end of the sleeve 12 of the positioning sleeve 1, and the outer diameter of the lower end of the conical disk 2 is larger than the inner diameter of the lower end of the sleeve 12 of the positioning sleeve 1; the outer diameter surface of the conical disk 2 is divided into an upper outer diameter surface and a lower outer diameter surface, and the cone angle of the upper outer diameter surface is greater than the cone angle of the lower outer diameter surface of the conical disk.

[0023] The upper part of the central shaft 3 is a smooth shaft 31, and the lower part is a threaded shaft 33. The threaded shaft 33 meshes with the internal threaded hole of the bronze bushing 20 of the tapered disk 2. A convex ring 32 is provided between the smooth shaft 31 and the threaded shaft 33; a pin hole is radially opened in the upper part of the smooth shaft 31.

[0024] A stepped central shaft through-hole that is smaller at the top and larger at the bottom is opened in the center of the cover plate 4. The inner diameter of the upper part of the central shaft through-hole matches the outer diameter of the smooth shaft 31 of the central shaft 3, and the inner diameter of the lower part of the central shaft through-hole matches the outer diameter of the convex ring 32 of the central shaft 3; four countersunk through-holes that correspond one by one to the four internal threaded holes on the positioning sleeve 1 are evenly distributed in the circumferential direction around the central shaft through-hole of the cover plate 4.

[0025] The handwheel 5 is sleeved on the upper part of the smooth shaft 31 of the central shaft 3 through a pin.

[0026] For the positioning device for measuring the rotational accuracy of a cylindrical roller bearing of the present utility model, during measurement, first place the reference end face of the outer ring of the bearing on the platform 100 with a guide. A measuring gauge is provided below the platform 100. Press the measuring tip of the measuring gauge against the bottom surface of the inner ring 111 of the bearing, and then insert the sleeve 12 of the positioning sleeve 1 into the flat retaining ring 112 and the inner ring 111 of the bearing from top to bottom in sequence; the tapered disk 2 is inserted into the inner cavity of the sleeve 12 from the bottom of the positioning sleeve 1, and the central shaft 3 is inserted into the central shaft through-hole from the top of the positioning sleeve 1 until the threaded shaft 33 of the central shaft 3 is screwed into the threaded inner hole of the bronze bushing 20, and the convex ring 32 of the central shaft 3 is caught by the top plate 11 of the positioning sleeve 1. Then, the cover plate 4 is sleeved on the smooth shaft 31 of the central shaft 3 through the central shaft through-hole and is installed on the top surface of the top plate 11 of the positioning sleeve 1 through several screws, so that the central shaft 3 cannot move axially but can only rotate. Finally, the handwheel 5 is installed on the central shaft 3. Rotate the central shaft 3 through the handwheel 5 to make the tapered disk 2 move upward and squeeze the six jaws 120 of the sleeve 12 of the positioning sleeve 1 to radially expand, so that the sleeve 12 reversely clamps the inner diameter surface of the inner ring 111 of the bearing and the inner diameter surface of the inner ring flat retaining ring 112, completing the connection between the positioning device and the bearing; the three limit screws 10 installed on the positioning sleeve 1 can control the clamping position of the positioning sleeve 1; apply a central axial load to the inner ring 11 of the bearing on the positioning device to ensure that the inner ring flat retaining ring 111 contacts the rolling elements; then the measurer performs the operation of rotating the inner ring 11 of the bearing through the handwheel 5 on the positioning device.

[0027] The positioning device for measuring the rotation accuracy of cylindrical roller bearings of the present utility model. Six arc grooves 104 are provided on the outer diameter surface of the top plate 11 of the positioning sleeve 1, which is convenient for the measurement personnel to grasp. Since the upper outer diameter surface of the tapered disk 2 has little effect when squeezing the six claws 120 of the positioning sleeve 1, mainly the lower outer diameter surface of the tapered disk 2 squeezes the six claws 120 of the positioning sleeve 1. Therefore, the outer diameter surface of the tapered disk 2 is divided into an upper outer diameter surface and a lower outer diameter surface, and the taper angle of the upper outer diameter surface is greater than the taper angle of the lower outer diameter surface of the tapered disk, which can reduce the weight of the entire tapered disk 2.

[0028] The above embodiments are only for illustrating the present utility model, rather than limiting the present utility model. Those skilled in the relevant technical fields can also make various changes or modifications without departing from the spirit and scope of the present utility model. Therefore, all equivalent technical solutions should also belong to the scope of the present utility model and should be defined by each claim.

Claims

1. A positioning device for measuring the rotational accuracy of a cylindrical roller bearing, comprising a positioning sleeve, a tapered disk, a central shaft and a cover plate; characterized in that, The positioning sleeve includes a circular top plate and a plurality of sleeves connected to the bottom surface of the top plate circumferentially and evenly; a central shaft through hole is opened at the center of the surface of the top plate, and a plurality of internal threaded holes are opened circumferentially and evenly on the surface of the top plate around the central shaft through hole; the outer diameter surface of the sleeve is a cylindrical surface and the diameter is adapted to the inner diameter of the bearing inner ring, and the inner diameter surface of the sleeve is a frustum of a cone surface that is smaller at the top and larger at the bottom, and the sleeve is surrounded by a plurality of sector-shaped clamping jaws; A connection hole leading to the bottom surface is opened at the center of the top surface of the tapered disk, and a copper sleeve with an internal threaded hole and a bottom stop edge is inlaid in the connection hole; the outer diameter surface of the tapered disk is a frustum of a cone surface that is smaller at the top and larger at the bottom, and the outer diameter of the upper end of the tapered disk is smaller than the inner diameter of the lower end of the sleeve of the positioning sleeve, and the outer diameter of the lower end of the tapered disk is larger than the inner diameter of the lower end of the sleeve of the positioning sleeve; The upper part of the central shaft is a smooth shaft, and the lower part is a threaded shaft meshing with the internal threaded hole of the copper sleeve on the tapered disk, and a convex ring is provided between the smooth shaft and the threaded shaft; A stepped central shaft through hole that is smaller at the top and larger at the bottom is opened at the center of the cover plate, and a plurality of counterbored through holes corresponding to the plurality of internal threaded holes on the positioning sleeve are opened circumferentially and evenly around the central shaft through hole; the inner diameter of the upper part of the central shaft through hole is adapted to the outer diameter of the smooth shaft of the central shaft, and the inner diameter of the lower part of the central shaft through hole is adapted to the outer diameter of the convex ring of the central shaft; The positioning sleeve is arranged in the bearing inner ring; the tapered disk is inserted into the inner cavity of the sleeve of the positioning sleeve from the bottom of the positioning sleeve, the central shaft is inserted into the central shaft through hole from the top of the positioning sleeve until the threaded shaft of the central shaft is screwed into the threaded inner hole of the copper sleeve, and the convex ring of the central shaft is caught by the top plate of the positioning sleeve, the cover plate is sleeved on the smooth shaft of the central shaft through the central shaft through hole and is installed on the top surface of the top plate of the positioning sleeve by a plurality of screws, so that the central shaft cannot move axially but can only rotate, and by rotating the central shaft, the tapered disk moves upward and squeezes the plurality of clamping jaws of the sleeve of the positioning sleeve to radially expand, so that the sleeve reversely clamps the bearing inner ring and the inner ring flat retaining ring.

2. The positioning device for measuring the rotational accuracy of a cylindrical roller bearing according to claim 1, characterized in that, A plurality of external threaded holes are opened circumferentially and evenly on the surface of the top plate of the positioning sleeve near the edge, and a limit screw is installed in each external threaded hole.

3. The positioning device for measuring the rotational accuracy of a cylindrical roller bearing according to claim 1 or 2, characterized in that, A plurality of arc-shaped grooves are radially opened evenly on the outer diameter surface of the top plate of the positioning sleeve.

4. The positioning device for measuring the rotational accuracy of a cylindrical roller bearing according to claim 1, wherein The outer diameter surface of the tapered disk is divided into an upper outer diameter surface and a lower outer diameter surface, and the cone angle of the upper outer diameter surface is greater than the cone angle of the lower outer diameter surface of the tapered disk.

5. The positioning device for measuring the rotation accuracy of a cylindrical roller bearing according to claim 1, characterized in that, A handwheel is also sleeved on the smooth shaft of the central shaft through a pin.

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