Three-coordinate measuring machine transmission device with gear and rack backlash eliminating function

Abstract

The utility model relates to a three-coordinate measuring machine transmission device with a gear and rack backlash eliminating function, which specifically comprises a multi-wedge belt wheel transmission shaft, a multi-wedge belt wheel, a multi-wedge belt wheel bearing seat and a plurality of connecting pieces, the device comprises a coupler, a gear transmission shaft, a rack, a gear connecting bearing seat, a threaded pressing block, a spring, a ball column, a hemisphere, a meshing gear bearing seat, a meshing gear connecting shaft, an automatic meshing gear and a transmission gear. The screw rotates downwards to press the threaded pressing block, the threaded pressing block downwards presses the spring, a pretightening force is added to the spring, the pretightening force generated by the spring is transmitted to the ball column, the ball column moves downwards to transmit the pretightening force to the meshing gear bearing seat, and then the pretightening force is transmitted to an automatic meshing gear of the meshing gear bearing seat. When position deviation is generated in the transmission process of the transmission gear and the rack, downward force of the automatic meshing gear can press the transmission gear of the gear transmission shaft, deviation is automatically corrected, and therefore the function of automatically eliminating gaps is achieved.

Description

Technical Field

[0001] This utility model relates to the field of coordinate measuring machines, specifically to a coordinate measuring machine transmission device with gear and rack backlash elimination function. Background Technology

[0002] In the field of industrial measurement, coordinate measuring machines (CMMs), as high-precision measuring devices, are widely used for the inspection of the dimensions, shape, and positional tolerances of various complex parts, playing a crucial role in ensuring product quality and improving production efficiency. During the operation of a CMM, the performance of the transmission mechanism directly determines the measurement accuracy and stability of the machine.

[0003] Traditional coordinate measuring machines (CMMs) typically use a rack and pinion drive to achieve axial movement. This drive system offers advantages such as simple structure and high transmission efficiency. However, in actual operation, backlash is unavoidable when the gears and rack mesh. When the CMM moves in the reverse direction, this backlash prevents the moving parts from responding immediately to motion commands, resulting in a backlash error. This backlash error directly affects the measurement results, severely impacting accuracy and causing deviations between the measured values ​​and the actual dimensions, thus failing to meet the requirements of high-precision measurement.

[0004] As the manufacturing industry continues to demand higher product quality, more stringent standards are being set for the measurement accuracy of coordinate measuring machines (CMMs). Especially in applications requiring long-stroke, high-precision measurements, the backlash problem inherent in traditional rack and pinion drives is becoming increasingly prominent, posing a key constraint on improving CMM performance. Utility Model Content

[0005] The purpose of this invention is to solve the backlash problem in the prior art and to provide a coordinate measuring machine transmission device with gear and rack backlash elimination function.

[0006] To solve the technical problem, the technical solution of this utility model is: a transmission device for a coordinate measuring machine with gear and rack backlash elimination function, comprising a multi-wedge pulley drive shaft, a multi-wedge pulley, a multi-wedge pulley bearing housing, multiple connecting parts, a coupling, a gear drive shaft, a rack, a gear connecting bearing housing, a threaded clamping block, a spring, a ball joint, a hemisphere, a meshing gear bearing housing, a meshing gear connecting shaft, an automatic meshing gear, and a transmission gear; the multi-wedge pulley drive shaft is arranged along a first direction, the multi-wedge pulley has a first through hole along the first direction, the multi-wedge pulley bearing housing has a second through hole along the first direction, the gear connecting bearing housing has a third through hole along the first direction, and the gear drive shaft is arranged along the first direction; one end of the multi-wedge pulley drive shaft is externally threaded and fitted with a locking nut, and the other end of the multi-wedge pulley drive shaft sequentially passes through the first through hole of the multi-wedge pulley. The first end of the multi-wedge pulley bearing housing is connected to one end of the coupling after passing through the second through hole of the bearing housing. The other end of the coupling is connected to one end of the gear drive shaft. The other end of the gear drive shaft passes through the third through hole of the gear connecting bearing housing and is connected to the drive gear. A rack is provided below the drive gear, and the drive gear and the rack mesh with each other for transmission. An automatic meshing gear is provided above the drive gear, and the automatic meshing gear meshes with the drive gear for transmission. The automatic meshing gear is provided on the meshing gear connecting shaft, which is set along the first direction. The two ends of the meshing gear connecting shaft are rotatably set at the bottom ends of the meshing gear bearing housing. The meshing gear bearing housing is rectangular with a downward opening. A hemisphere and a ball column are provided above the meshing gear bearing housing. The ball column, hemisphere, and meshing gear bearing housing are all provided with coaxial first threaded holes along a second direction perpendicular to the first direction.

[0007] The connector passes sequentially through the first threaded hole from the top of the ball column, fixing the ball column, hemisphere, and meshing gear bearing seat together. The upper part of the hemisphere spherically fits the bottom of the ball column, and the lower bottom surface of the hemisphere contacts the top of the meshing gear bearing seat. A spring is provided at the top of the ball column, and a threaded clamping block is provided above the spring. Pressing down on the threaded clamping block clamps the spring, causing the ball column to move downward. The ball column presses down on the meshing gear bearing seat, causing the meshing gear bearing seat to move downward. The automatic meshing gear on the meshing gear connecting shaft follows the downward movement of the meshing gear bearing seat, clamping the transmission gear. The system also includes a motor, which is connected to a multi-wedge pulley to provide power.

[0008] Preferably, it further includes that the carriage is arranged along a second direction perpendicular to the first direction. The shape of the carriage is "factory" shaped. A fourth through hole is opened on the left side of the carriage. A carriage counter bore is opened along the second direction above the carriage. A carriage connecting part is installed in the carriage counter bore. There are multiple first setscrew holes around the upper part of the carriage connecting part. The carriage connecting part is fixed on the corresponding mounting hole of the carriage through a connecting part passing through the first setscrew holes. The shape of the carriage counter bore matches the shape of the carriage connecting part. The carriage connecting part includes a first counter bore integrally formed from one end to the other end and a second counter bore adjacent to the first counter bore. The first setscrew holes are located around the top of the first counter bore of the carriage connecting part. The shape of the first counter bore is rectangular at the top and cylindrical at the bottom. The shape of the second counter bore is a cuboid. The first counter bore and the second counter bore are both provided with a fifth through hole along the second direction. A second setscrew hole is provided along the first direction on the right side of the second counter bore. A setscrew is installed in the second setscrew hole. A ball column is installed at the lower end inside the second counter bore. The ball column can move up and down in the second counter bore. A spring is provided at the top of the ball column. A threaded compression block is provided above the spring. The second setscrew hole is used to compress and fix the threaded compression block inside the second counter bore.

[0009] Preferably, the multi-wedge belt pulley bearing seat passes through the fourth through hole on the left side of the carriage. On both sides symmetrically near one end of the multi-wedge belt pulley of the multi-wedge belt pulley bearing seat, carriage mounting holes are opened. At the position of the carriage corresponding to the carriage mounting holes, corresponding mounting holes are opened. The connecting part passes through the carriage mounting holes to fixedly install the multi-wedge belt pulley bearing seat on the corresponding mounting holes of the carriage.

[0010] Preferably, the ball column is arranged along a second direction perpendicular to the first direction. The shape of the ball column is vertically cylindrical. A small cylindrical boss is provided above. The first threaded hole of the ball column is a countersunk through hole. The spring is sleeved on the small cylindrical boss at the top of the ball column. A spherical countersunk inner hole adapted to the hemisphere is provided at the bottom of the ball column. The shape of the hemisphere is hemispherical. The spherical shape of the hemisphere contacts the spherical countersunk inner hole at the bottom of the ball column. The bottom surface of the hemisphere contacts the rectangular groove opened at the top of the meshing gear bearing seat. The rectangular groove is used to place the hemisphere.

[0011] Preferably, the shape of the meshing gear connecting shaft is horizontally cylindrical; the shape of the gear transmission shaft is horizontally cylindrical, and the shape of the gear connecting bearing seat is rectangular; the shape of the multi-wedge belt pulley transmission shaft is horizontally cylindrical, and the shape of the multi-wedge belt pulley bearing seat is circular stepped; the connecting part is a screw.

[0012] Preferably, the meshing gear has third bearing mounting holes at both ends, and a third bearing is installed in the third bearing mounting holes; the module and number of teeth of the meshing gear and the gear transmission shaft are the same, and the tooth pitch error is ≤0.5um; a meshing gear connecting shaft through hole is opened at both ends of the bottom of the meshing gear bearing seat along the first direction, and the two ends of the meshing gear connecting shaft are set in the meshing gear connecting shaft through hole; a third set screw thread hole is opened below the meshing gear connecting shaft through hole along the second direction perpendicular to the first direction, and a set screw is provided in the third set screw thread hole for tightening the meshing gear connecting shaft.

[0013] Preferably, a gear bearing housing connecting shaft is fixedly connected to the upper part of the gear connecting bearing housing. The gear bearing housing connecting shaft is arranged along a second direction perpendicular to the first direction. The shape of the gear bearing housing connecting shaft is inverted T-shaped, with a rectangle at the bottom and a cylinder at the top. The rectangle at the bottom of the gear bearing housing connecting shaft has a gear bearing housing connecting shaft mounting hole. The upper part of the gear connecting bearing housing has a corresponding mounting hole corresponding to the gear bearing housing connecting shaft mounting hole. The connector passes through the gear bearing housing connecting shaft mounting hole and is installed onto the corresponding mounting hole of the gear connecting bearing housing.

[0014] Preferably, the cylindrical part above the gear bearing housing connecting shaft extends into the first countersunk hole and is connected by an interference fit, and a set screw is installed in the first set screw hole; a spacer ring is provided between the third bearing of the meshing gear on both ends of the meshing gear connecting shaft and the through hole of the meshing gear connecting shaft. The spacer ring is a circular ring and is used to restrict the left and right movement of the third bearing.

[0015] Preferably, the second through hole of the multi-wedge pulley bearing housing has first bearing step mounting holes at both ends, and a first bearing is installed in the first bearing step mounting holes; the third through hole has second bearing step mounting holes at both ends, and a second bearing is installed in the second bearing step mounting holes; the multi-wedge pulley is connected to the multi-wedge pulley drive shaft through a connector; the automatic meshing gear is connected to the meshing gear connecting shaft through a connector.

[0016] Preferably, the multi-wedge pulley bearing housing is clamped to the two adjacent end faces of the coupling using corrugated retaining rings; the coupling is clamped to the two adjacent end faces of the gear connecting bearing housing using corrugated retaining rings.

[0017] The first, second, and third through holes are coaxial, and have the same diameter. The first and second through holes are adapted to the diameter of the multi-wedge pulley drive shaft, and the diameter of the third through hole is adapted to the diameter of the gear drive shaft. The length of the rectangular groove opened at the top of the meshing gear bearing seat is greater than or equal to the diameter of the hemisphere. The length of the top of the meshing gear bearing seat is greater than the length of the bottom of the ball column.

[0018] Compared with the prior art, the advantages of this utility model are:

[0019] (1) This utility model provides a three-coordinate measuring machine transmission device with gear and rack backlash elimination function, including a multi-wedge pulley drive shaft, a multi-wedge pulley, a multi-wedge pulley bearing housing, multiple connecting parts, a coupling, a gear drive shaft, a rack, a gear connecting bearing housing, a threaded clamping block, a spring, a ball column, a hemisphere, a meshing gear bearing housing, a meshing gear connecting shaft, an automatic meshing gear, and a transmission gear. A locking nut is used to clamp the external thread of the multi-wedge pulley drive shaft to eliminate backlash and improve transmission accuracy. A coupling is used to resolve the radial deviation between the multi-wedge pulley drive shaft and the gear drive shaft. The screw in the first set screw hole eliminates the vertical deviation of the transmission gear shaft, reducing radial error. The hemisphere and the ball column are connected by a connecting part, pressing the ball column against the hemisphere. When the ball column moves downward, the meshing gear bearing housing moves downward. This design ensures that the automatic meshing gear cannot move in any direction, guaranteeing complete engagement with the gear drive shaft and reducing errors. The connector of this invention fixes the ball column, hemisphere, and meshing gear bearing seat. Rotating downwards presses down the threaded clamping block, which in turn presses down the spring, adding a preload force. This preload force is transmitted to the ball column, which moves downwards, transferring this force to the meshing gear bearing seat, and then to the automatic meshing gear within the bearing seat. When a positional deviation occurs during the transmission of the gear and rack, the downward force of the automatic meshing gear presses against the gear drive shaft, automatically correcting the deviation and thus achieving automatic backlash elimination. This mechanism, through a series of precisely designed components, achieves backlash-free meshing of the gear and rack, improving transmission and measurement accuracy.

[0020] (2) The transmission mechanism of this utility model adopts a modular design, and the components are connected by connectors, which facilitates installation, disassembly and maintenance;

[0021] (3) The multi-wedge pulley drive shaft, gear drive shaft and automatic meshing gear of this utility model are all supported by bearings, which reduces friction and wear and extends the service life of the transmission device. Attached Figure Description

[0022] Figure 1 A schematic diagram of the structure of a coordinate measuring machine transmission device with gear and rack backlash elimination function according to this utility model;

[0023] Figure 2 This utility model discloses a schematic diagram of the structural components of a coordinate measuring machine transmission device with gear and rack backlash elimination function, including the slide connector, threaded clamping block, ball column, hemisphere, and the connection between the meshing gear bearing seat.

[0024] Figure 3A schematic diagram of the structure of the slide, multi-wedge pulley bearing seat, and slide connector of the transmission device of a coordinate measuring machine with gear and rack backlash elimination function according to this utility model;

[0025] Figure 4 This utility model discloses a backlash elimination principle diagram of a coordinate measuring machine transmission device with gear and rack backlash elimination function;

[0026] Figure 5 A schematic diagram of the slide connector of a coordinate measuring machine transmission device with gear and rack backlash elimination function according to this utility model;

[0027] Figure 6 This utility model discloses a structural schematic diagram of a meshing gear bearing seat for a three-coordinate measuring machine transmission device with gear and rack backlash elimination function.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Multi-ribbed pulley drive shaft; 2. Locking nut; 3. Multi-ribbed pulley; 301. First through hole; 4. First bearing; 5. Multi-ribbed pulley bearing housing; 501. Carrier mounting hole; 502. Second through hole; 5021. First bearing stepped mounting hole; 6. Coupling; 7. Carrier; 701. Fourth through hole; 702. Carrier countersunk hole; 8. Gear drive shaft; 9. Rack; 10. Second bearing; 11. Gear connecting bearing housing; 1101. Third through hole; 11011. Second bearing stepped mounting hole; 12. Gear bearing housing connecting shaft; 1201. Gear bearing housing connecting shaft mounting hole; 13. Carrier connecting piece. 1301, First countersunk hole; 1302, Second countersunk hole; 1303, Fifth through hole; 14, First set screw hole; 15, Threaded clamping block; 16, Second set screw hole; 17, Spring; 18, Ball column; 1801, Spherical countersunk inner hole; 19, Hemisphere; 20, Meshing gear bearing seat; 201, Rectangular groove; 202, Meshing gear connecting shaft through hole; 21, Meshing gear connecting shaft; 22, Third set screw threaded hole; 23, Spacer ring; 24, Third bearing; 25, Automatic meshing gear; 2501, Third bearing mounting hole; 26, Wave retaining ring; 27, First threaded hole; 28, Transmission gear. Detailed Implementation

[0030] The specific embodiments of this utility model are described below with reference to examples:

[0031] It should be noted that the structures, proportions, sizes, etc. shown in this specification are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which this utility model can be implemented. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0032] Example 1

[0033] like Figures 1-6 As shown, this utility model discloses a transmission device for a coordinate measuring machine with a gear and rack backlash elimination function, including a multi-wedge pulley drive shaft 1, a multi-wedge pulley 3, a multi-wedge pulley bearing seat 5, multiple screws, a coupling 6, a gear drive shaft 8, a rack 9, a gear connecting bearing seat 11, a threaded clamping block 15, a spring 17, a ball column 18, a hemisphere 19, a meshing gear bearing seat 20, a meshing gear connecting shaft 21, an automatic meshing gear 25, and a transmission gear 28; the multi-wedge pulley drive shaft 1 is arranged along a first direction, the multi-wedge pulley 3 has a first through hole 301 along the first direction, the multi-wedge pulley bearing seat 5 has a second through hole 502 along the first direction, the gear connecting bearing seat 11 has a third through hole 1101 along the first direction, and the gear drive shaft 8 is arranged along the first direction; one end of the multi-wedge pulley drive shaft 1 is externally threaded and fitted with a locking nut 2, and the other end of the multi-wedge pulley drive shaft 1 passes through the first through hole 301 of the multi-wedge pulley 3 and the multi-wedge pulley bearing seat 5 in sequence. The second through hole 502 is connected to one end of the coupling 6, and the other end of the coupling 6 is connected to one end of the gear drive shaft 8; the other end of the gear drive shaft 8 passes through the third through hole 1101 of the gear connecting bearing seat 11 and is connected to the drive gear 28. A rack 9 is provided below the drive gear 28, and the drive gear 28 and the rack 9 mesh with each other for transmission; an automatic meshing gear 25 is provided above the drive gear 28, and the automatic meshing gear 25 meshes with the drive gear 28 for transmission; the automatic meshing gear 25 is provided on the meshing gear connecting shaft 21, which is set along the first direction, and both ends of the meshing gear connecting shaft 21 are rotatably set at the bottom ends of the meshing gear bearing seat 20; the shape of the meshing gear bearing seat 20 is a downward-opening rectangle; a hemisphere 19 and a ball column 18 are provided above the meshing gear bearing seat 20, and the ball column 18, the hemisphere 19 and the meshing gear bearing seat 20 are all provided with a coaxial first threaded hole 27 along a second direction perpendicular to the first direction;

[0034] A screw passes through the first threaded hole 27 from above the ball post 18 to fix the ball post 18, hemisphere 19, and gear bearing seat 20 together. The upper spherical surface of the hemisphere 19 contacts the bottom of the ball post 18, and the lower bottom surface of the hemisphere 19 contacts the top of the gear bearing seat 20. A spring 17 is provided at the top of the ball post 18, and a threaded clamping block 15 is provided above the spring 17. Pressing down on the threaded clamping block 15 clamps the spring 17, causing the ball post 18 to move downward. The ball post 18 presses down on the gear bearing seat 20, causing the gear bearing seat 20 to move downward. The automatic meshing gear 25 on the gear connecting shaft 21 follows the gear bearing seat 20 and moves downward to clamp the transmission gear 28. The system also includes a motor, which is connected to the multi-wedge pulley 3 to provide power.

[0035] The first direction is horizontal, and the second direction is vertical; the end of the multi-ribbed pulley drive shaft 1 is externally threaded, and the multi-ribbed pulley 3 is provided with holes for installing screws. The screws pass through the holes and are tightened on the external thread of the multi-ribbed pulley drive shaft 1, and the locking nut 2 is pressed on the external thread of the multi-ribbed pulley drive shaft 1.

[0036] During the rotation of the multi-ribbed pulley 3, a rotational backlash will be generated. The locking nut 2 can be adjusted to increase the preload, eliminate the rotational backlash of the multi-ribbed pulley drive shaft 10, and improve the transmission accuracy.

[0037] Screws securely connect the ball column, hemisphere, and gear bearing housing. Pressure is applied above the threaded clamping block 15 to compress the spring 17, causing the ball column 18 to press downwards, which in turn presses the gear bearing housing 20 downwards. The downward pressure of the gear bearing housing 20 then presses the automatic gear 25 inside the gear bearing housing 20 downwards, thereby pressing the automatic gear 25 against the drive gear 8. The drive gear 8 then presses against the rack 9. Tightening or releasing the threaded clamping block 15 can adjust the pressure of the ball column 18 pressing downwards onto the automatic gear 25 inside the gear bearing housing 20, thereby adjusting the pressure of the automatic gear 25 against the drive gear 8 and the drive gear 8 against the rack 9.

[0038] A wave-shaped retaining ring 26 is used to prevent the multi-ribbed pulley drive shaft 1 from moving laterally during operation. Radial deviation will occur between the multi-ribbed pulley drive shaft 1 and the gear drive shaft 8 during operation. The coupling 6 can solve the problem of radial deviation between the two shafts.

[0039] Example 2

[0040] like Figure 1 , Figure 3 and Figure 5As shown, preferably, it further includes a carriage 7 arranged along a second direction perpendicular to the first direction. The shape of the carriage 7 is "factory" - shaped. A fourth through - hole 701 is opened on the left side of the carriage 7, and a carriage counterbore 702 is opened along the second direction above the carriage 7. A carriage connecting member 13 is installed in the carriage counterbore 702. Four first set - screw holes 14 are evenly arranged around the circumference above the carriage connecting member 13. The carriage connecting member 13 is fixed to the corresponding mounting holes on the carriage 7 by screws passing through the first set - screw holes 14. The shape of the carriage counterbore 702 is adapted to the shape of the carriage connecting member 13. The carriage connecting member 13 includes a first counterbore 1301 integrally formed from one end to the other end and a second counterbore 1302 adjacent to the first counterbore. The first set - screw holes 14 are located around the top of the first counterbore 1301 of the carriage connecting member 13. The shape of the first counterbore 1301 is rectangular above and cylindrical below, and the shape of the second counterbore 1302 is a cuboid. Fifth through - holes 1303 are provided in the first counterbore 1301 and the second counterbore 1302 along the second direction. A second set - screw hole 16 is provided on the right side of the second counterbore 1302 along the first direction. A set - screw is installed in the second set - screw hole 16. A ball column 18 is installed at the lower end inside the second counterbore 1302. The ball column 18 can move up and down in the second counterbore 1302. A spring 17 is provided at the top of the ball column 18, and a threaded compression block 15 is provided above the spring 17. The second set - screw hole 16 is used to compress and fix the threaded compression block 15 inside the second counterbore 1302.

[0041] A set - screw is installed in the second set - screw hole 16. The set - screw is used to tighten the threaded compression block 15 to prevent the threaded compression block 15 from rotating. Rotating and pressing down the threaded compression block 15, the threaded compression block 15 presses down the spring 17, adding a pre - tightening force to the spring 17. The pre - tightening force generated by the spring 17 is transmitted to the ball column 18. The ball column 18 moves downward and transmits this force to the meshing gear bearing seat 11, and then to the automatic meshing gear 25 of the meshing gear bearing seat 11. The automatic meshing gear 25 presses against the transmission gear 8, making the transmission gear 8 and the rack 9 mesh with each other, and can automatically adjust the intermittent compensation.

[0042] As Figure 1 and Figure 3 As shown, preferably, the multi - wedge belt pulley bearing seat 5 passes through the fourth through - hole 701 on the left side of the carriage 7. Two symmetrically - opened carriage mounting holes 501 are provided on both sides of one end of the multi - wedge belt pulley bearing seat 5 close to the multi - wedge belt pulley 3. Corresponding mounting holes are opened at the positions of the carriage 7 corresponding to the carriage mounting holes 501. Screws pass through the carriage mounting holes 501 to fixedly install the multi - wedge belt pulley bearing seat 5 on the corresponding mounting holes of the carriage 7.

[0043] There are four carriage mounting holes 501, one at the top, bottom, left, and right respectively. The multi - wedge belt pulley bearing seat 5 is installed on the carriage 7 by screws passing through the carriage mounting holes 501.

[0044] like Figure 1 and Figure 2 As shown, preferably, the ball post 18 is arranged along a second direction perpendicular to the first direction. The ball post 18 is in the shape of a vertical cylinder, with a small cylindrical boss on the top. The first threaded hole 27 of the ball post 18 is a countersunk through hole. The spring 17 is sleeved on the small cylindrical boss at the top of the ball post 18. The bottom of the ball post 18 is provided with a spherical countersunk inner hole 1801 that matches the hemisphere 19. The hemisphere 19 is in the shape of a hemisphere. The spherical shape of the hemisphere 19 contacts the spherical countersunk inner hole 1801 at the bottom of the ball post 18. The bottom surface of the hemisphere 19 contacts the rectangular groove 201 opened at the top of the meshing gear bearing seat 20. The rectangular groove 201 is used to place the hemisphere 19.

[0045] The hemisphere 19 and the ball post 18 are connected by screws, so that the ball post 18 and the hemisphere 19 are pressed together. The purpose is to prevent the meshing gear 25 from moving in the front, back, left, and right directions, ensuring complete meshing with the gear drive shaft 8 and reducing errors.

[0046] Preferably, the meshing gear connecting shaft 21 is cylindrical; the gear drive shaft 8 is cylindrical; the gear connecting bearing seat 11 is rectangular; the multi-wedge pulley drive shaft 1 is cylindrical; and the multi-wedge pulley bearing seat 5 is stepped.

[0047] like Figure 6 As shown, preferably, the meshing gear 25 has third bearing mounting holes 2501 at both ends, and a third bearing 24 is installed in the third bearing mounting holes 2501; the module and number of teeth of the meshing gear 25 and the gear transmission shaft 8 are the same, and the tooth pitch error is ≤0.5um; the bottom ends of the meshing gear bearing seat 20 each have a meshing gear connecting shaft through hole 202 along the first direction, the two ends of the meshing gear connecting shaft 21 are set in the meshing gear connecting shaft through hole 202, and a third set screw thread hole 22 is opened below the meshing gear connecting shaft through hole 202 along the second direction perpendicular to the first direction, and a set screw is provided in the third set screw thread hole 22 for tightening the meshing gear connecting shaft 21. The meshing gear connecting shaft 21 is tightened by the set screw, which solves the problem of the meshing gear rotating during the use of the meshing gear connecting shaft 21.

[0048] The third bearing 24 can eliminate the radial force generated by the gear. It is connected through the meshing gear connecting shaft and installed in the through holes on both sides of the meshing gear bearing housing.

[0049] Preferably, a gear bearing housing connecting shaft 12 is fixedly connected to the upper part of the gear connecting bearing housing 11. The gear bearing housing connecting shaft 12 is arranged along a second direction perpendicular to the first direction. The gear bearing housing connecting shaft 12 is inverted T-shaped, with a rectangular lower part and a cylindrical upper part. The rectangular lower part of the gear bearing housing connecting shaft 12 is provided with a gear bearing housing connecting shaft mounting hole 1201. The upper part of the gear connecting bearing housing 11 is provided with a corresponding mounting hole corresponding to the gear bearing housing connecting shaft mounting hole 1201. Screws pass through the gear bearing housing connecting shaft mounting hole 1201 and are installed into the corresponding mounting hole of the gear connecting bearing housing 11.

[0050] Preferably, the cylindrical part above the gear bearing housing connecting shaft 12 extends into the first countersunk hole 1301 and is connected by interference fit, and a set screw is installed in the first set screw hole 14; a spacer ring 23 is provided between the third bearing 24 of the meshing gear 25 on both ends of the meshing gear connecting shaft 21 and the through hole 202 of the meshing gear connecting shaft. The spacer ring 23 is a circular ring and is used to restrict the left and right movement of the third bearing 24.

[0051] Installing a set screw in the first set screw hole 14 can eliminate the deviation generated on the upper and lower parts of the transmission gear shaft 8, reducing radial error.

[0052] Preferably, the second through hole 502 of the multi-ribbed pulley bearing housing 5 has first bearing step mounting holes 5021 at both ends, and a first bearing 4 is installed in the first bearing step mounting holes 5021; the third through hole 1101 has second bearing step mounting holes 11011 at both ends, and a second bearing 10 is installed in the second bearing step mounting holes 11011; the multi-ribbed pulley 3 is connected to the multi-ribbed pulley drive shaft 1 by screws; the automatic meshing gear 25 is connected to the meshing gear connecting shaft 21 by screws.

[0053] Preferably, the two adjacent end faces of the multi-wedge pulley bearing housing 5 and the coupling 6 are clamped together by a wave-shaped retaining ring 26; the two adjacent end faces of the coupling 6 and the gear connecting bearing housing 11 are clamped together by a wave-shaped retaining ring 26.

[0054] The first through hole 301, the second through hole 502, and the third through hole 1101 are coaxial, and the diameters of the first through hole 301, the second through hole 502, and the third through hole 1101 are the same. The first through hole 301 and the second through hole 502 are adapted to the diameter of the multi-wedge pulley drive shaft 1, and the diameter of the third through hole 1101 is adapted to the diameter of the gear drive shaft 8. The length of the rectangular groove 201 opened at the top of the meshing gear bearing seat 20 is greater than the diameter of the hemisphere 19. The length of the top of the meshing gear bearing seat 20 is greater than the length of the bottom of the ball column 18.

[0055] The working principle of this utility model is as follows:

[0056] like Figures 1-6 As shown, this utility model discloses a transmission device for a coordinate measuring machine with a gear and rack backlash elimination function. It includes a multi-wedge pulley drive shaft, a multi-wedge pulley, a multi-wedge pulley bearing housing, multiple screws, a coupling, a gear drive shaft, a rack, a gear connecting bearing housing, a threaded clamping block, a spring, a ball column, a hemisphere, a meshing gear bearing housing, a meshing gear connecting shaft, an automatic meshing gear, and a transmission gear. The multi-wedge pulley is connected to a motor to provide power. The coupling connects the multi-wedge pulley drive shaft and the gear drive shaft, solving the vertical error problem between them. A gear connecting bearing housing connecting shaft is fixedly connected above the gear connecting bearing housing. The connecting shaft connects the gear connecting bearing housing to the slide via a slide connector, and the ball column, spring, and threaded clamping block are also installed and connected to the slide via the slide connector, solving the problem of vertical fixation.

[0057] The clearance is eliminated by pressing down the spring with a threaded clamping block, which adds a preload to the spring and generates a downward force. This force is transmitted to the ball joint, which moves downward and transmits the force to the meshing gear bearing housing, and then to the automatic meshing gear in the meshing gear bearing housing. When the gear drive shaft and rack drive are misaligned, the downward force of the meshing gear can press the drive gear on the gear drive shaft, automatically correcting the misalignment and thus achieving the function of automatically eliminating clearance.

[0058] This invention achieves backlash-free gear and rack meshing through a series of precisely designed components, thereby improving transmission and measurement accuracy.

[0059] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

[0060] Many other changes and modifications can be made without departing from the concept and scope of this utility model. It should be understood that this utility model is not limited to the specific embodiments, and the scope of this utility model is defined by the appended claims.

Claims

1. A transmission device for a coordinate measuring machine with gear and rack backlash elimination function, characterized in that: Includes a multi-ribbed pulley drive shaft (1), a multi-ribbed pulley (3), a multi-ribbed pulley bearing housing (5), multiple connecting parts, a coupling (6), a gear drive shaft (8), a rack (9), a gear connecting bearing housing (11), a threaded clamping block (15), a spring (17), a ball column (18), a hemisphere (19), a meshing gear bearing housing (20), a meshing gear connecting shaft (21), an automatic meshing gear (25), and a transmission gear (28); the multi-ribbed pulley drive shaft (1) is arranged along a first direction, and the multi-ribbed pulley (3) is arranged along the first direction. A first through hole (301) is provided, a second through hole (502) is opened along the first direction for the multi-wedge pulley bearing housing (5), a third through hole (1101) is opened along the first direction for the gear connecting bearing housing (11), and a gear drive shaft (8) is arranged along the first direction; one end of the multi-wedge pulley drive shaft (1) is externally threaded and fitted with a locking nut (2), and the other end of the multi-wedge pulley drive shaft (1) passes through the first through hole (301) of the multi-wedge pulley (3) and the second through hole (502) of the multi-wedge pulley bearing housing (5) in sequence, and then connects with the coupling (6). One end of the coupling (6) is connected to the gear drive shaft (8), and the other end of the coupling (6) is connected to one end of the gear drive shaft (8); the other end of the gear drive shaft (8) passes through the third through hole (1101) of the gear connecting bearing seat (11) and is connected to the drive gear (28). A rack (9) is provided below the drive gear (28), and the drive gear (28) and the rack (9) mesh with each other for transmission; an automatic meshing gear (25) is provided above the drive gear (28), and the automatic meshing gear (25) meshes with the drive gear (28) for transmission; the automatic meshing gear (25) The meshing gear connecting shaft (21) is set on the meshing gear connecting shaft (21) along the first direction. The meshing gear bearing seat (20) is rectangular with a downward opening. The two ends of the meshing gear connecting shaft (21) are rotatably set at the bottom ends of the meshing gear bearing seat (20). A hemisphere (19) and a ball column (18) are provided above the meshing gear bearing seat (20). The ball column (18), the hemisphere (19) and the meshing gear bearing seat (20) are all provided with a coaxial first threaded hole (27) along the second direction perpendicular to the first direction. The connecting piece sequentially passes through the first threaded hole (27) from above the ball column (18) to fixedly connect the ball column (18), the hemispherical body (19), and the meshing gear bearing seat (20). The upper part of the hemispherical body (19) is spherically adapted to the bottom of the ball column (18), and the bottom surface of the lower part of the hemispherical body (19) contacts the top of the meshing gear bearing seat (20); a spring (17) is provided at the top of the ball column (18), and a threaded pressing block (15) is provided above the spring (17). When the threaded pressing block (15) is pressed down, the threaded pressing block (15) compresses the spring (17), and the spring (17) causes the ball column (18) to move downward. The ball column (18) presses down the meshing gear bearing seat (20), and the meshing gear bearing seat (20) moves downward. The automatic meshing gear (25) on the meshing gear connecting shaft (21) moves downward along with the meshing gear bearing seat (20) to press the transmission gear (28); it further includes a motor, and the motor is connected to the multi-wedge belt pulley (3) to provide power for it.

2. The coordinate measuring machine transmission device with gear and rack backlash elimination function according to claim 1, characterized in that: It further includes a carriage (7) arranged along a second direction perpendicular to the first direction. The shape of the carriage (7) is "factory" shaped. A fourth through hole (701) is opened on the left side of the carriage (7), and a carriage counterbore (702) is opened above the carriage (7) along the second direction. A carriage connecting piece (13) is installed in the carriage counterbore (702). A plurality of first set screw holes (14) are provided around the upper part of the carriage connecting piece (13). The carriage connecting piece (13) is fixed on the corresponding mounting holes of the carriage (7) through the connecting piece passing through the first set screw holes (14). The shape of the carriage counterbore (702) is adapted to the shape of the carriage connecting piece (13); the carriage connecting piece (13) includes a first counterbore (1301) integrally formed from one end to the other end and a second counterbore (1302) adjacent to the first counterbore. The first set screw holes (14) are located around the top of the first counterbore (1301) of the carriage connecting piece (13); the shape of the first counterbore (1301) is rectangular at the upper part and cylindrical at the lower part, and the shape of the second counterbore (1302) is a cuboid. Fifth through holes (1303) are provided in the first counterbore (1301) and the second counterbore (1302) along the second direction. A second set screw hole (16) is provided on the right side of the second counterbore (1302) along the first direction. A set screw is installed in the second set screw hole (16). The ball column (18) is installed at the lower end inside the second counterbore (1302). The ball column (18) can move up and down in the second counterbore (1302). A spring (17) is provided at the top of the ball column (18), and a threaded pressing block (15) is provided above the spring (17). The second set screw hole (16) is used to press and fix the threaded pressing block (15) inside the second counterbore (1302).

3. A coordinate measuring machine transmission device with gear and rack backlash elimination function according to claim 2, characterized in that: The multi-ribbed pulley bearing housing (5) passes through the fourth through hole (701) on the left side of the slide (7). The multi-ribbed pulley bearing housing (5) has symmetrical slide mounting holes (501) on both sides of the end near the multi-ribbed pulley (3). The slide (7) has corresponding mounting holes at the positions corresponding to the slide mounting holes (501). The connector passes through the slide mounting holes (501) to fix the multi-ribbed pulley bearing housing (5) on the corresponding mounting holes of the slide (7).

4. A coordinate measuring machine transmission device with gear and rack backlash elimination function according to claim 3, characterized in that: The ball column (18) is arranged along a second direction perpendicular to the first direction. The ball column (18) is shaped like a vertical cylinder and has a small cylindrical boss on top. The first threaded hole (27) of the ball column (18) is a countersunk through hole. The spring (17) is sleeved on the small cylindrical boss at the top of the ball column (18). The bottom of the ball column (18) has a spherical countersunk inner hole (1801) that matches the hemisphere (19). The hemisphere (19) is shaped like a hemisphere. The spherical shape of the hemisphere (19) contacts the spherical countersunk inner hole (1801) at the bottom of the ball column (18). The bottom surface of the hemisphere (19) contacts the rectangular groove (201) opened at the top of the meshing gear bearing seat (20). The rectangular groove (201) is used to place the hemisphere (19).

5. A coordinate measuring machine transmission device with gear and rack backlash elimination function according to claim 4, characterized in that: The meshing gear connecting shaft (21) is cylindrical; the gear drive shaft (8) is cylindrical; the gear connecting bearing seat (11) is rectangular; the multi-wedge pulley drive shaft (1) is cylindrical; the multi-wedge pulley bearing seat (5) is stepped; the connecting component is a screw.

6. A coordinate measuring machine transmission device with gear and rack backlash elimination function according to claim 5, characterized in that: The meshing gear (25) has a third bearing mounting hole (2501) at both ends, and a third bearing (24) is installed in the third bearing mounting hole (2501); the meshing gear (25) and the gear transmission shaft (8) have the same module and number of teeth, and the tooth pitch error is ≤0.5um; the bottom ends of the meshing gear bearing seat (20) each have a meshing gear connecting shaft through hole (202) along the first direction, and the two ends of the meshing gear connecting shaft (21) are set in the meshing gear connecting shaft through hole (202). Below the meshing gear connecting shaft through hole (202), a third set screw thread hole (22) is opened along the second direction perpendicular to the first direction, and a set screw is provided in the third set screw thread hole (22) for tightening the meshing gear connecting shaft (21).

7. A coordinate measuring machine transmission device with gear and rack backlash elimination function according to claim 6, characterized in that: The gear bearing housing (11) is fixedly connected to the gear bearing housing connecting shaft (12) above. The gear bearing housing connecting shaft (12) is arranged along a second direction perpendicular to the first direction. The gear bearing housing connecting shaft (12) is inverted T-shaped. The lower part of the gear bearing housing connecting shaft (12) is rectangular and the upper part is cylindrical. The lower rectangle of the gear bearing housing connecting shaft (12) is provided with a gear bearing housing connecting shaft mounting hole (1201). The gear bearing housing (11) is provided with a corresponding mounting hole corresponding to the gear bearing housing connecting shaft mounting hole (1201) above. The connector passes through the gear bearing housing connecting shaft mounting hole (1201) and is installed on the corresponding mounting hole of the gear bearing housing (11).

8. A coordinate measuring machine transmission device with gear and rack backlash elimination function according to claim 7, characterized in that: The cylindrical part above the gear bearing housing connecting shaft (12) extends into the first countersunk hole (1301) and is connected by interference fit. The first set screw hole (14) is installed with a set screw. A spacer (23) is provided between the third bearing (24) of the meshing gear (25) on both ends of the meshing gear connecting shaft (21) and the through hole (202) of the meshing gear connecting shaft. The spacer (23) is a circular ring and is used to restrict the left and right movement of the third bearing (24).

9. A coordinate measuring machine transmission device with gear and rack backlash elimination function according to claim 8, characterized in that: The second through hole (502) of the multi-wedge pulley bearing housing (5) has first bearing step mounting holes (5021) at both ends, and a first bearing (4) is installed in the first bearing step mounting holes (5021); the third through hole (1101) has second bearing step mounting holes (11011) at both ends, and a second bearing (10) is installed in the second bearing step mounting holes (11011); the multi-wedge pulley (3) is connected to the multi-wedge pulley drive shaft (1) through a connector; the automatic meshing gear (25) is connected to the meshing gear connecting shaft (21) through a connector.

10. A coordinate measuring machine transmission device with gear and rack backlash elimination function according to claim 9, characterized in that: The two adjacent end faces of the multi-wedge pulley bearing housing (5) and the coupling (6) are clamped together by a wave-shaped retaining ring (26); the two adjacent end faces of the coupling (6) and the gear connecting bearing housing (11) are clamped together by a wave-shaped retaining ring (26). The first through hole (301), the second through hole (502), and the third through hole (1101) are coaxial. The diameters of the first through hole (301), the second through hole (502), and the third through hole (1101) are the same. The first through hole (301) and the second through hole (502) are adapted to the diameter of the multi-wedge pulley drive shaft (1), and the diameter of the third through hole (1101) is adapted to the diameter of the gear drive shaft (8). The length of the rectangular groove (201) opened at the top of the meshing gear bearing seat (20) is greater than the diameter of the hemisphere (19), and the length of the top of the meshing gear bearing seat (20) is greater than the length of the bottom of the ball column (18).

Images