Gear positioning clamp

Abstract

The utility model provides a gear positioning clamp which comprises a lower base fixedly installed on a working table, and a positioning structure is arranged on the top of the lower base. The upper base is fixedly arranged on the lower base, a matching structure used for being matched with the positioning structure is arranged at the bottom of the upper base, and the positioning structure is used for guaranteeing the perpendicularity of the upper base in the vertical direction; the floating positioning tray is fixedly arranged at the top of the upper base, and an elastic element is clamped between the floating positioning tray and the upper base; the upper base is further provided with a fixing mechanism, and the fixing mechanism is used for fixing the gear placed on the floating positioning tray. The problem that in the prior art, gear machining precision is low is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of gear processing, in particular to a gear positioning fixture. Background Art

[0002] With the continuous development of new energy vehicles, the precision requirements for reducer gear shafts in new energy vehicles are getting higher and higher. The new requirements have been increased from the previous 6-level precision to a stable guarantee within 5 levels. In order to improve the precision requirements of gears, many gears are eventually processed by grinding or honing to reduce the NVH in the product assembly EOL test. Therefore, how to improve the processing accuracy of gears and reduce the surface waviness and roughness of products has become an urgent problem to be solved. Summary of the invention

[0003] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a gear positioning fixture to solve the problem of low gear machining accuracy in the prior art.

[0004] To achieve the above-mentioned purpose and other related purposes, the utility model provides a gear positioning fixture, including a lower base, which is fixedly installed on a work surface, and a positioning structure is provided on the top of the lower base; an upper base, which is fixedly arranged on the lower base, and the bottom of the upper base is provided with a matching structure for matching with the positioning structure, and the positioning structure is used to ensure the verticality of the upper base in the vertical direction; a floating positioning tray, which is fixedly arranged on the top of the upper base, and an elastic element is clamped between the floating positioning tray and the upper base; a fixing mechanism is also provided on the upper base, and the fixing mechanism is used to fix the gear placed on the floating positioning tray.

[0005] Preferably, the positioning structure is a ball centering ring, which comprises a ring body, a plurality of circular grooves are provided on the circumferential surface of the ring body along the circumferential direction of the ring body, and balls are rotatably embedded in the circular grooves.

[0006] Preferably, the elastic element is a spring.

[0007] Preferably, the upper base is fixedly connected to the lower base by bolts.

[0008] Preferably, the floating positioning tray is fixedly connected to the upper base by bolts.

[0009] Preferably, a conical through hole is provided in the middle of the upper base, and the diameter of the conical through hole gradually decreases from top to bottom in the vertical direction, and a connecting through hole is provided in the middle of the floating positioning tray, and the connecting through hole corresponds to the conical through hole; the fixing mechanism includes an expansion sleeve and a driving device, wherein the expansion sleeve sliding sleeve is arranged in the conical through hole, the outer wall of the expansion sleeve is in contact with the inner wall of the conical through hole, and the driving device is connected to the expansion sleeve, and the driving device is used to drive the expansion sleeve to move up and down relative to the conical through hole.

[0010] Preferably, the driving device is a cylinder, and a piston rod of the cylinder is connected to the expansion sleeve.

[0011] As described above, the gear positioning fixture of the utility model has the following beneficial effects: when in use, firstly, the verticality of the upper base fixedly installed on the upper base can be ensured through the cooperation between the positioning structure on the lower base and the matching structure on the upper base; secondly, a floating positioning tray is arranged on the upper base, and an elastic element is arranged between the floating positioning tray and the upper base; when positioning the gear to be processed, the gear to be processed is placed on the floating positioning tray, and then the gear is fixed by a fixing mechanism; since an elastic element is arranged between the floating positioning tray and the upper base, the gear and the upper base are in soft contact that can float up and down; through this structural design, the jumping deformation in the end face direction of the gear can be eliminated, and the verticality in the vertical direction during gear processing can be further ensured, thereby improving the grinding accuracy of the gear and improving the accuracy of the accumulated radial runout of the gear. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Shown is a schematic structural diagram of the gear positioning fixture provided by the utility model.

[0013] Figure 2 Shown is a three-dimensional schematic diagram of the gear positioning fixture provided by the utility model.

[0014] Figure 3 Shown is a schematic structural diagram of the lower base provided by the utility model.

[0015] Figure 4 The diagram shows the clamping and positioning of the gears on the floating positioning tray during operation provided by the utility model.

[0016] Description of Reference Numerals

[0017] 10 Lower base

[0018] 20 Upper base

[0019] 30 Floating Positioning Pallet

[0020] 301 Shrapnel

[0021] 11 Ball centering ring

[0022] 111 Ball

[0023] 110 Ring body

[0024] 100 Gears DETAILED DESCRIPTION

[0025] The following is an explanation of the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0026] In the description of the present utility model, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, it can be a mechanical connection, it can be an electrical connection, it can be a direct connection, it can be connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like used in the present invention to indicate the orientation or position relationship is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0028] See also Figures 1 to 4 It should be noted that the illustrations provided in this embodiment are only used to schematically illustrate the basic concept of the utility model, and the drawings only show the components related to the utility model rather than the number, shape and size of the components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0029] The utility model provides a gear positioning fixture, specifically Figures 1 to 4As shown, the gear positioning fixture includes a lower base 10, an upper base 20, and a floating positioning tray 30, wherein the lower base 10 is fixedly installed on the work surface, and a positioning structure is provided on the top of the lower base 10, the upper base 20 is fixedly arranged on the lower base 10, and a matching structure for matching with the positioning structure is provided at the bottom of the upper base 20, and the positioning structure is used to ensure the verticality of the upper base 20 in the vertical direction; the floating positioning tray 30 is fixedly arranged on the top of the upper base 20, and an elastic element is clamped between the floating positioning tray 30 and the upper base 20, and a fixing mechanism is also provided on the upper base 20, and the fixing mechanism is used to fix the gear 100 placed on the floating positioning tray 30.

[0030] Since the gear has a large deformation after heat treatment, if the end face of the gear is in rigid contact with the upper base 20, the vibration deformation in the direction of the end face of the gear, i.e. the vertical direction, will be converted to the direction of the pitch circle of the gear, i.e. the radial direction of the gear, thereby making the verticality of the gear placed on the upper base 20 poor, thereby affecting the grinding accuracy of the gear. When the gear positioning fixture of the utility model is in use, firstly, the verticality of the upper base 20 fixedly installed on the upper base 10 can be ensured through the cooperation between the positioning structure on the lower base 10 and the matching structure on the upper base 20. Secondly, a floating positioning tray 30 is provided on the upper base 20, and an elastic element is provided between the floating positioning tray 30 and the upper base 20. When positioning the gear to be processed, the gear 100 to be processed is placed on the floating positioning tray 30, and then the gear 100 is fixed by a fixing mechanism. Since an elastic element is provided between the floating positioning tray 30 and the upper base 20, the gear 100 and the upper base 20 are in soft contact that can float up and down. Through this structural design, the jumping deformation in the direction of the gear end face can be eliminated, and the verticality of the gear in the vertical direction during processing can be further ensured, thereby improving the grinding processing accuracy of the gear and improving the accuracy of the accumulated radial runout of the gear.

[0031] Preferably, Figure 3As shown, in this embodiment, the positioning structure provided at the top of the lower base 10 includes a ball centering ring 11. Specifically, the ball centering ring 11 includes a ring body 110, and a plurality of circular grooves (not shown in the figure) are provided on the circumferential surface of the ring body 110 along the circumferential direction of the ring body 110, and the balls 111 are rotatably embedded in the circular grooves. Correspondingly, the matching structure provided at the bottom of the upper base 20 can be a columnar positioning block (not shown in the figure) adapted to the ball centering ring 11. Specifically, in this embodiment, the upper base 20 is fixedly connected to the lower base 10 by bolts. During installation, firstly match the cylindrical positioning block at the bottom of the upper base 20 with the ball centering ring 11 at the top of the lower base 10, that is, the cylindrical positioning block is embedded in the ball centering ring 11, so that the outer wall surface of the cylindrical positioning block is tangent to the multiple balls on the ball centering ring 11, thereby avoiding radial clearance and ensuring the verticality of the upper base 20 installed on the lower base 10, and then fix the upper base to the lower base by bolts.

[0032] Specifically, in this embodiment, the floating positioning tray 30 is fixedly connected to the upper base 20 by bolts, and the structure is simple and convenient for disassembly and assembly. Preferably, in this embodiment, the elastic element sandwiched between the floating positioning tray 30 and the upper base 20 is a spring 301 (not shown in the figure). Of course, in other optional embodiments, the elastic element can also be a spring, etc.

[0033] Specifically, Figure 4 As shown, in the present embodiment, a tapered through hole is provided in the middle of the upper base 20, and the diameter of the tapered through hole gradually decreases from top to bottom in the vertical direction. Correspondingly, a connecting through hole corresponding to the tapered through hole is provided in the middle of the floating positioning tray 30; in the present embodiment, the fixing mechanism includes an expansion sleeve 40 and a driving device (not shown in the figure), and the expansion sleeve 40 is slidably sleeved in the tapered through hole, and the outer wall of the expansion sleeve 40 is in contact with the inner wall of the tapered through hole, and the driving device is connected to the expansion sleeve 40, and the driving device is used to drive the expansion sleeve 40 to move up and down relative to the tapered through hole. When the gear 100 is positioned on the floating positioning tray 30, the central convex shaft of the gear passes through the connecting through hole in the middle of the floating positioning tray 30 and extends into the expansion sleeve 40. Then, when the gear 100 placed on the floating positioning tray 30 is fixed, the expansion sleeve 40 is pulled downward relative to the tapered through hole by the driving device. Since the diameter of the tapered through hole gradually decreases from top to bottom along the vertical direction, when the driving device pulls the expansion sleeve 40 downward, the expansion sleeve 40 will shrink inwardly to clamp the convex shaft of the gear 100, thereby fixing the gear 100. Preferably, in this embodiment, the driving device is a cylinder, and the piston rod of the cylinder is connected to the expansion sleeve 40, which has a simple structure and low cost.

[0034] In summary, the gear positioning fixture of the utility model can eliminate the runout deformation in the gear end face direction through the design of the ball centering ring and the floating positioning tray, further ensure the verticality of the gear in the vertical direction during processing, thereby improving the grinding processing accuracy of the gear, improving the accuracy of the gear cumulative radial runout, and reducing the probability of "ghost steps". Therefore, the utility model effectively overcomes various shortcomings in the prior art and has a high industrial utilization value.

[0035] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A gear positioning fixture, characterized in that: include: A lower base is fixedly mounted on the work surface, and a positioning structure is provided on the top of the lower base; An upper base, wherein the upper base is fixedly arranged on the lower base, and a matching structure for matching with the positioning structure is provided at the bottom of the upper base, and the positioning structure is used to ensure the verticality of the upper base in the vertical direction; A floating positioning tray, wherein the floating positioning tray is fixedly arranged on the top of the upper base, and an elastic element is sandwiched between the floating positioning tray and the upper base; The upper base is also provided with a fixing mechanism, and the fixing mechanism is used to fix the gear placed on the floating positioning tray.

2. A gear positioning fixture according to claim 1, characterized in that: The positioning structure is a ball centering ring, which includes a ring body. A plurality of circular grooves are arranged on the circumferential surface of the ring body along the circumferential direction of the ring body, and balls are rotatably embedded in the circular grooves.

3. The gear positioning fixture according to claim 1, characterized in that: The elastic element is a spring.

4. The gear positioning fixture according to claim 1, characterized in that: The upper base is fixedly connected to the lower base by bolts.

5. The gear positioning fixture according to claim 1, characterized in that: The floating positioning tray is fixedly connected to the upper base by bolts.

6. The gear positioning fixture according to claim 1, characterized in that: A conical through hole is provided in the middle of the upper base, and the diameter of the conical through hole gradually decreases from top to bottom in the vertical direction, and a connecting through hole is provided in the middle of the floating positioning tray, and the connecting through hole corresponds to the conical through hole; the fixing mechanism includes an expansion sleeve and a driving device, wherein the expansion sleeve sliding sleeve is arranged in the conical through hole, the outer wall of the expansion sleeve is in contact with the inner wall of the conical through hole, and the driving device is connected to the expansion sleeve, and the driving device is used to drive the expansion sleeve to move up and down relative to the conical through hole.

7. A gear positioning fixture according to claim 6, characterized in that: The driving device is a cylinder, and the piston rod of the cylinder is connected to the expansion sleeve.

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