CN205614468U - Derailleur gear hole polishing frock - Google Patents

Abstract

The utility model relates to a production frock especially relates to a derailleur gear hole polishing frock. This derailleur gear hole polishing frock, including the anchor clamps of the gear that is used for fixed derailleur, still include with the supporting rod of the coaxial setting of anchor clamps, the supporting rod passes through motor drive, the supporting rod middle part is provided with the centre gripping hole, the centre gripping is downthehole to be provided with flexible burnishing roll, the one end that the supporting rod is close to anchor clamps is provided with the breach groove around the supporting rod, supporting rod outside threaded connection has lock nut. The utility model discloses have the bump that to carry high tooth wheel hole roughness effectively, reduce gear hole surface and cusp, require beneficial effect such as lower, the quick production of being convenient for to the positioning accuracy of machining tool.

Description

Transmission gear inner hole polishing tooling

technical field

The utility model relates to a production tool, in particular to a polishing tool for the inner hole of a transmission gear.

Background technique

After the transmission gear is heat-treated, grinding is used to make the inner diameter of the gear inner hole meet the required size requirements, but the surface roughness of the inner hole of the gear after grinding does not meet the requirements for use, and there are abrupt bumps and sharp points on the surface. The existing processing method is to reserve a dimensional allowance of 0.02mm, and honing the inner hole surface of the gear with a honing rod. Although the surface after honing is smoother, it is necessary to destroy the original precision and re-establish a new precision. Moreover, the honing method of the honing rod is rigid grinding. It is necessary to ensure that the honing rod and the workpiece are coaxial, that is, the honing rod, the workpiece and the fixture for fixing the workpiece need to be fixed coaxially. The positioning accuracy is required to be high, and a slight deviation will easily cause excessive error in the inner hole of the gear, which requires repeated calibration and reduces production efficiency.

Utility model content

The utility model is mainly aimed at the above problems, and provides a transmission that can effectively improve the surface roughness of the inner hole of the gear, reduce the bumps and sharp points on the inner hole surface of the gear, have lower requirements on the positioning accuracy of processing tools, and facilitate rapid production. Gear inner hole polishing tooling.

The purpose of this utility model is mainly achieved by the following scheme: a transmission gear inner hole polishing tool, including a clamp for fixing the gear of the transmission, and a clamping rod coaxially arranged with the clamping rod, the clamping rod passes through Driven by a motor, a clamping hole is provided in the middle of the clamping rod, and a flexible polishing roller is provided in the clamping hole. A notch groove is provided around the clamping rod at one end of the clamping rod close to the clamp, and a locking nut is threaded on the outside of the clamping rod. The clamp can clamp and fix the transmission gear, so that the axis of the gear and the axis of the clamping rod are theoretically coaxial. The clamping rod is driven to rotate by the motor. A clamping hole is set in the middle of the clamping rod, and a flexible polishing is set in the clamping hole. Roller, flexible polishing roller is a flexible structure, and the polishing process is flexible grinding, which can grind the bumps and sharp points on the surface of the inner hole of the gear, with a small amount of grinding, and will not damage the original precision of the inner hole surface of the gear. And because the polishing process is flexible grinding, when there is a slight deviation between the axis of the clamping rod and the fixture, it will not have an excessive impact on the size of the inner hole of the gear. The axial positioning accuracy is not high, and there is no need for repeated calibration, which improves production efficiency and realizes rapid production. The end of the clamping rod close to the fixture is provided with a notch around the clamping rod, so that the parts on both sides of the notch can be concentrated inwardly. When the polishing roller is inserted into the clamping hole, tighten the lock nut, and use the tightening nut to make the notch The parts on both sides of the groove gather inward and tighten the polishing roller to realize the positioning of the polishing roller.

Preferably, the polishing roller includes a positioning rod, a polishing ball arranged around the positioning rod, and a flexible link for connecting the positioning rod and the polishing ball. The positioning rod is inserted into the clamping hole in the clamping rod, and the positioning rod is tightened by the parts on both sides of the notch groove to realize the positioning of the polishing roller. Polishing balls are arranged around the positioning rod, and the surface of the inner hole of the gear is ground by using the polishing ball. The contact between the polishing ball and the inner hole of the gear is a point contact, and the grinding amount is small. The flexible connecting rod is used to connect the polishing ball and the positioning rod. When the diameter of the cylinder formed by the polishing ball is larger than the inner hole of the gear, the flexible connecting rod can be slightly deformed so that the polishing ball enters the inner hole of the gear, and the flexible connecting rod is affected by the inner hole of the gear. It can limit the deformation, and at the same time, it can exert an outward expansion support force on the polishing ball, and increase the grinding force of the polishing ball.

Preferably, the flexible connecting rod is helically distributed around the axis of the positioning rod, and the rotating direction of the flexible connecting rod is the same as that of the motor. The flexible connecting rod is helically distributed around the axis of the positioning rod. The flexible connecting rod can guide the pressure and support force between the polishing ball and the inner hole of the gear, so that the direction of the force is not located in the radial direction of the polishing roller, which is convenient for the flexible connecting rod to be compressed. out of shape. The direction of rotation of the flexible connecting rod is the same as that of the motor. When the motor rotates and drives the positioning rod to rotate, the direction of rotation of the flexible connecting rod is the same as that of the positioning rod, so that the friction between the polishing ball and the surface of the inner hole of the gear is even.

Preferably, the outer surface of one end of the clamping rod close to the clamp is a tapered surface. The outer surface of the end of the clamping rod close to the fixture is a tapered surface. When the lock nut is tightened on the tapered surface, it can clamp the parts on both sides of the notch groove, so that the parts on both sides of the notch groove can clamp the positioning rod of the flexible polishing roller .

Preferably, the notch grooves are evenly distributed around the clamping rod. The notch grooves are evenly distributed around the clamping rod, so as to ensure that the parts on both sides of the notch groove have an even clamping force on the positioning rod of the flexible polishing roller.

Preferably, the clamp is a three-jaw chuck structure. The fixture is a three-jaw chuck structure, which can improve the firmness of the fixed gear, and can ensure that the axis of the gear is almost the same as the axis of the fixture.

Preferably, the outer diameter of the flexible polishing roller is 1-2 mm larger than the inner diameter of the gear. The flexible connecting rod of the flexible polishing roller can be slightly deformed by the pressure of the inner hole surface of the gear. At the same time, it is necessary to ensure that the supporting force of the flexible connecting rod on the polishing ball is sufficient to grind the inner hole surface of the gear. Therefore, the outer diameter ratio of the flexible polishing roller is guaranteed The diameter of the inner hole of the gear is 1-2mm larger.

Therefore, the transmission gear inner hole polishing tool of the present utility model has the following advantages: the flexible polishing roller is a flexible structure, and the polishing process is flexible grinding, which can grind the bumps and sharp points on the surface of the gear inner hole, and the grinding amount is relatively small. Small, it will not destroy the original precision of the inner hole surface of the gear. And because the polishing process is flexible grinding, when there is a slight deviation between the axis of the clamping rod and the fixture, it will not have an excessive impact on the size of the inner hole of the gear. The axial positioning accuracy is not high, and there is no need for repeated calibration, which improves production efficiency and realizes rapid production. The end of the clamping rod close to the fixture is provided with a notch around the clamping rod, so that the parts on both sides of the notch can be concentrated inwardly. When the polishing roller is inserted into the clamping hole, tighten the lock nut, and use the tightening nut to make the notch The parts on both sides of the groove gather inward and tighten the polishing roller to realize the positioning of the polishing roller.

Description of drawings

Accompanying drawing 1 is a kind of structural representation of the utility model;

Accompanying drawing 2 is a partial enlarged sectional view of A place in accompanying drawing 1;

Accompanying drawing 3 is the structural representation of flexible polishing roller among the utility model;

Accompanying drawing 4 is the top view of accompanying drawing 3.

Illustration: 1-table, 2-clamp, 3-gear of transmission, 4-flexible polishing roller, 41-positioning rod, 42-polishing ball, 43-flexible connecting rod, 5-clamping rod, 51-clamp Holding hole, 52-notch slot, 6-lock nut, 7-motor.

detailed description

The technical solutions of the present utility model will be further specifically described below through the embodiments and in conjunction with the accompanying drawings.

Embodiment 1: As shown in Figures 1 and 2, a transmission gear inner hole polishing tool includes a clamp 2 for fixing the gear 3 of the transmission and a clamping rod 5 coaxially arranged with the clamp, and the clamp is a three-jaw chuck structure, the fixture is fixed on the workbench 1. The clamping rod is driven by the motor 7, and the middle part of the clamping rod is provided with a clamping hole 51, and a flexible polishing roller 4 is arranged in the clamping hole, and the outer diameter of the flexible polishing roller is 1.5 mm larger than the inner diameter of the gear. One end of the clamping rod close to the clamp is provided with a notch groove 52 around the clamping rod, and the notch grooves are evenly distributed around the clamping rod, and the outer side of the clamping rod is threaded with a locking nut 6 . The outer surface of one end of the clamping rod close to the clamp is a tapered surface. As shown in Figures 3 and 4, the polishing roller includes a positioning rod 41, a polishing ball 42 arranged around the positioning rod, and a flexible connecting rod 43 for connecting the positioning rod and the polishing ball. The flexible connecting rod is helically distributed around the axis of the positioning rod, and the rotating direction of the flexible connecting rod is the same as that of the motor.

The clamp can clamp and fix the transmission gear, so that the axis of the gear and the axis of the clamping rod are theoretically coaxial. The clamping rod is driven to rotate by the motor. A clamping hole is set in the middle of the clamping rod, and a flexible polishing is set in the clamping hole. Roller, flexible polishing roller is a flexible structure, and the polishing process is flexible grinding, which can grind the bumps and sharp points on the surface of the inner hole of the gear, with a small amount of grinding, and will not damage the original precision of the inner hole surface of the gear. And because the polishing process is flexible grinding, when there is a slight deviation between the axis of the clamping rod and the fixture, it will not have an excessive impact on the size of the inner hole of the gear. The axial positioning accuracy is not high, and there is no need for repeated calibration, which improves production efficiency and realizes rapid production. The end of the clamping rod close to the fixture is provided with a notch around the clamping rod, so that the parts on both sides of the notch can be concentrated inwardly. When the polishing roller is inserted into the clamping hole, tighten the lock nut, and use the tightening nut to make the notch The parts on both sides of the groove gather inward and tighten the polishing roller to realize the positioning of the polishing roller. The positioning rod is inserted into the clamping hole in the clamping rod, and the positioning rod is tightened by the parts on both sides of the notch groove to realize the positioning of the polishing roller. Polishing balls are arranged around the positioning rod, and the surface of the inner hole of the gear is ground by using the polishing ball. The contact between the polishing ball and the inner hole of the gear is a point contact, and the grinding amount is small. The flexible connecting rod is used to connect the polishing ball and the positioning rod. When the diameter of the cylinder formed by the polishing ball is larger than the inner hole of the gear, the flexible connecting rod can be slightly deformed so that the polishing ball enters the inner hole of the gear, and the flexible connecting rod is affected by the inner hole of the gear. It can limit the deformation, and at the same time, it can exert an outward expansion support force on the polishing ball, and increase the grinding force of the polishing ball. The flexible connecting rod is helically distributed around the axis of the positioning rod. The flexible connecting rod can guide the pressure and support force between the polishing ball and the inner hole of the gear, so that the direction of the force is not located in the radial direction of the polishing roller, which is convenient for the flexible connecting rod to be compressed. out of shape. The direction of rotation of the flexible connecting rod is the same as that of the motor. When the motor rotates and drives the positioning rod to rotate, the direction of rotation of the flexible connecting rod is the same as that of the positioning rod, so that the friction between the polishing ball and the surface of the inner hole of the gear is even. The outer surface of the end of the clamping rod close to the fixture is a tapered surface. When the lock nut is tightened on the tapered surface, it can clamp the parts on both sides of the notch groove, so that the parts on both sides of the notch groove can clamp the positioning rod of the flexible polishing roller . The notch grooves are evenly distributed around the clamping rod, so as to ensure that the parts on both sides of the notch groove have an even clamping force on the positioning rod of the flexible polishing roller. The fixture is a three-jaw chuck structure, which can improve the firmness of the fixed gear, and can ensure that the axis of the gear is almost the same as the axis of the fixture. The flexible connecting rod of the flexible polishing roller can be slightly deformed by the pressure of the inner hole surface of the gear. At the same time, it is necessary to ensure that the supporting force of the flexible connecting rod on the polishing ball is sufficient to grind the inner hole surface of the gear. Therefore, the outer diameter ratio of the flexible polishing roller is guaranteed The diameter of the inner hole of the gear is 1.5mm larger.

It should be understood that this embodiment is only used to illustrate the utility model but not to limit the scope of the utility model. In addition, it should be understood that after reading the content taught by the utility model, those skilled in the art can make various changes or modifications to the utility model, and these equivalent forms also fall within the scope defined by the appended claims of the application.

Claims (7)

1. A transmission gear inner hole polishing tool, including a clamp (2) for fixing the gear (3) of the transmission, characterized in that it also includes a clamping rod (5) coaxially arranged with the clamp, and the clamp The holding rod (5) is driven by a motor (7), and the middle part of the clamping rod (5) is provided with a clamping hole (51), and a flexible polishing roller (4) is provided in the clamping hole (51), The end of the clamping rod (5) close to the clamp is provided with a notch (52) around the clamping rod (5), and the outside of the clamping rod (5) is threaded with a lock nut (6). 2. The transmission gear inner hole polishing tool according to claim 1, characterized in that, the polishing roller includes a positioning rod (41), a polishing ball (42) arranged around the positioning rod (41), used for connecting and positioning Rod (41) and flexible link (43) of polished ball (42). 3. The transmission gear inner hole polishing tool according to claim 2, characterized in that, the flexible connecting rod (43) is helically distributed around the axis of the positioning rod (41), and the direction of rotation of the flexible connecting rod (43) is the same as The direction of rotation of the motors is the same. 4. The transmission gear inner hole polishing tool according to claim 1, 2 or 3, characterized in that the outer surface of the end of the clamping rod (5) close to the clamp is a tapered surface. 5. The transmission gear inner hole polishing tool according to claim 1, 2 or 3, characterized in that, the notch grooves (52) are uniformly distributed around the clamping rod (5). 6. The transmission gear inner hole polishing tool according to claim 1, 2 or 3, characterized in that, the clamp is a three-jaw chuck structure. 7. The transmission gear inner hole polishing tool according to claim 1, 2 or 3, characterized in that the outer diameter of the flexible polishing roller (4) is 1-2mm larger than the gear inner hole diameter.