Gear grinding fixture

Abstract

The application discloses a gear grinding fixture, which comprises a body, a base, a tensioning sleeve, a pull rod and a piston, wherein the body is detachably connected with the base, and a piston cavity is formed in the base; a bottom plate is arranged on the lower end cover of the base, an annular positioning boss is arranged on the upper end surface of the bottom plate, the positioning boss extends into the lower end of the piston cavity, and a first sealing ring is arranged between the outer circumferential surface of the positioning boss and the inner circumferential surface of the piston cavity; the piston comprises a small-diameter upper section, a large-diameter middle section and a small-diameter lower section which are sequentially connected in sequence; the outer circumferential surfaces of the small-diameter upper section and the large-diameter middle section are respectively provided with second and third sealing rings between the outer circumferential surfaces and the inner circumferential surface of the piston cavity; the small-diameter lower section extends into the positioning boss downwards, and a fourth sealing ring is arranged between the circumferential surfaces of the small-diameter lower section and the positioning boss; a positioning hole is concavely arranged on the lower end surface of the small-diameter lower section, a positioning column is detachably connected on the bottom plate in correspondence, the positioning column extends into the positioning hole upwards to form an up-and-down sliding fit, and a first positioning pin is arranged between the large-diameter middle section and the base. The structure has a good piston positioning effect and is stable and reliable in movement.

Description

Technical Field

[0001] This invention relates to the field of toothed parts processing technology, and in particular to a tooth grinding fixture. Background Technology

[0002] With the rapid development of modern machinery industry and the continuous progress of science and technology, gear transmission equipment is being driven towards high speed, heavy load, high power, high efficiency, and high precision, placing higher demands on gear machining accuracy. The process of grinding the tooth surfaces of gears using a gear grinding machine is called gear grinding. The main purpose of gear grinding is to eliminate deformation of the gear teeth after heat treatment and to improve gear precision. The precision of the ground gear teeth can reach grade 6-3 (JB179-83) or higher. Gear grinding is indispensable; gear transmission is the transmission link between various mechanical components and the foundation for the normal and efficient operation of mechanical equipment.

[0003] Existing gear grinding fixtures generally employ a hydraulic tensioning structure. For example, Chinese patent ZL201820143758.4 discloses a gear grinding fixture comprising a base, a piston, a pull rod, a tensioning sleeve, and a body. The base and body are detachably connected, and the base has a cavity for accommodating the piston. The body has an inner hole for accommodating the pull rod, with one end fixedly connected to the piston and the other end extending out of the body. The cavity is divided into upper and lower oil chambers by the piston. In this structure, the piston uses a two-stage stepped structure, with its positioning and guiding part located on one side of the upper oil chamber, resulting in poor positioning and guiding performance and insufficient stability. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the above-mentioned problems and provide a grinding fixture to improve the positioning stability of the internal piston, ensure that the piston works more reliably, and improve its service life.

[0005] The technical solution of this invention is: The grinding fixture of the present invention includes a body, a base, a tensioning sleeve, a pull rod, and a piston. The body and the base are detachably connected. The base has a piston cavity for the piston to slide up and down. The feature is that the lower end of the base is covered with a bottom plate. The upper surface of the bottom plate is provided with an annular positioning boss. The positioning boss extends into the lower end of the piston cavity. A first sealing ring is provided between its outer circumferential surface and the inner circumferential surface of the piston cavity. The piston includes an upper section with a small diameter, a middle section with a large diameter, and a lower section with a small diameter connected in sequence. The outer circumferential surfaces of the upper section with a small diameter and the middle section with a large diameter are respectively provided with a second sealing ring and a third sealing ring between them and the inner circumferential surface of the piston cavity. The lower section with a small diameter extends downward into the positioning boss and a fourth sealing ring is provided between the circumferential surfaces of the two mating surfaces. The lower end face of the smaller diameter section is recessed with a positioning hole, and a positioning post is detachably connected to the base plate. The positioning post extends upward into the positioning hole and the two slide up and down in a sliding fit. A first positioning pin is also provided between the larger diameter section and the base.

[0006] This structure designs the piston as a multi-segment form with a large middle section and small ends. Through the matching of the upper section with the small diameter, the middle section with the large diameter and the inner circumference of the piston cavity, and the matching of the lower section with the small diameter and the positioning boss and positioning post structure of the base plate, combined with the first positioning pin between the middle section with the large diameter and the base, the piston is positioned and guided, enhancing the positioning stability of the piston and ensuring its reliable operation.

[0007] Furthermore, in the gear grinding fixture of the present invention, the lower end face of the base plate is recessed with a mounting hole that communicates with the central area of ​​the positioning boss. The positioning post is sequentially inserted into the mounting hole and the positioning boss. A locking sleeve is also screwed into the mounting hole, and the locking sleeve is fixedly connected to the positioning post by bolts. The above structure allows for quick installation and removal of the positioning post, facilitating maintenance and replacement.

[0008] Furthermore, in the gear grinding fixture of the present invention, a first stepped surface is provided in the mounting hole, and a limiting protrusion is provided at the lower end of the positioning post. The limiting protrusion abuts against the first stepped surface to enhance the limiting and stopping effect on the positioning post.

[0009] Furthermore, in the gear grinding fixture of the present invention, a second positioning pin is provided between the base plate and the base to improve the positioning and installation accuracy of the base plate and the base.

[0010] Furthermore, in the gear grinding fixture of the present invention, the pull rod passes through the body, its upper end is fixedly connected to the tensioning sleeve, and its lower end extends into the piston cavity and is directly connected to the upper section of the small diameter.

[0011] Furthermore, in the gear grinding fixture of the present invention, the main body is provided with a second stepped surface, and a support seat for abutting and supporting the lower end face of the workpiece is sleeved on the second stepped surface. The support seat is detachably connected to the main body; the upper end of the main body is provided with a tapered head that cooperates with the tensioning sleeve. By the support seat abutting the lower end face of the workpiece and the tensioning sleeve tensioning and supporting the inner hole of the workpiece, the workpiece is clamped and positioned, enhancing the stability of the workpiece installation.

[0012] Furthermore, in the gear grinding fixture of the present invention, an oil passage for connecting the outside to the piston chamber is provided on the base plate.

[0013] The beneficial effects of this invention are: This invention comprises a piston consisting of a small-diameter upper section, a large-diameter middle section, and a small-diameter lower section. Positioning of the piston is achieved through the cooperation of the small-diameter upper section and the large-diameter middle section with the piston cavity, the cooperation of the small-diameter lower section with the center of the annular positioning boss on the base plate, the cooperation of the positioning hole of the small-diameter lower section with the positioning post on the base plate, and the first positioning pin between the large-diameter middle section and the base. This increases the positioning guide length, resulting in a stable and reliable positioning effect. It enables the piston to move up and down steadily without offset or rotation, making the operation more stable and reliable. Furthermore, it is convenient, labor-saving, and quick to install. Attached Figure Description

[0014] Figure 1 This is a cross-sectional schematic diagram of the present invention.

[0015] Figure 2 for Figure 1 A magnified view of a portion of the image. Detailed Implementation

[0016] The present invention will now be further described with reference to the accompanying drawings: Reference Figure 1 and Figure 2 As shown, the gear grinding fixture described in this embodiment includes a body 1, a base 2, a tensioning sleeve 5, a pull rod 3, and a piston 4. The body 1 and the base 2 are detachably connected. A piston chamber is provided inside the base 2. A bottom plate 8 is provided at the lower end of the base 2. An oil passage 8a for connecting the outside and the piston chamber is provided on the bottom plate 8.

[0017] The upper surface of the base plate 8 is provided with an annular positioning boss 9, which extends into the lower end of the piston cavity. A first sealing ring 12 is provided between its outer circumferential surface and the inner circumferential surface of the piston cavity.

[0018] The piston 4 includes an upper section 4a with a small diameter, a middle section 4b with a large diameter, and a lower section 4c with a small diameter connected in sequence. The outer circumferential surfaces of the upper section 4a with a small diameter and the middle section 4b with a large diameter are respectively provided with a second sealing ring 13 and a third sealing ring 14 between them and the inner circumferential surface of the piston cavity. The lower section 4c with a small diameter extends downward into the positioning boss 9 and a fourth sealing ring 15 is provided between the circumferential surfaces of the two mating.

[0019] The lower end face of the smaller diameter section 4c is recessed with a positioning hole 18. A positioning post 10 is detachably connected to the base plate 8. The positioning post 10 extends upward into the positioning hole 18, and the two slide upward and downward in a sliding fit. Specifically, the lower end face of the base plate 8 is recessed with a mounting hole 19 that communicates with the central area of ​​the positioning boss 9. The positioning post 10 passes through the mounting hole 19 and the positioning boss 8 in sequence. A locking sleeve 11 is also screwed into the mounting hole 19. The locking sleeve 11 and the positioning post 10 are fixedly connected by bolts (bolts are not shown in the figure). The mounting hole 19 is provided with a first stepped surface. The lower end of the positioning post 10 is provided with a limiting protrusion 10a, which abuts against the first stepped surface.

[0020] A first positioning pin 16 is provided between the large diameter middle section 4b and the base 2, and a second positioning pin 17 is provided between the base plate 8 and the base 2.

[0021] The pull rod 3 runs through the body 1, with its upper end fixedly connected to the tensioning sleeve 5 and its lower end extending into the piston cavity and directly connected to the small-diameter upper section 4a.

[0022] The body 1 has a second stepped surface, and a support seat 6 for abutting and supporting the lower end face of the workpiece 7 is fitted on the second stepped surface. The support seat 6 is detachably connected to the body 1. The upper end of the body 1 has a conical head that cooperates with the tensioning sleeve 5.

[0023] In this structure, the piston 4 is divided into three sections: the upper section 4a with a small diameter, the middle section 4b with a large diameter, and the lower section 4c with a small diameter. The upper and lower end faces of the middle section 4b with a large diameter form oil chambers with the piston cavity and the positioning boss 9 of the base plate 8, respectively. The piston 4 is pushed by changing the internal hydraulic oil pressure. At the same time, sealing rings are provided on the mating surfaces of each section with the piston cavity and the positioning boss 9, which have good sealing performance. The positioning and guiding of the piston 4 is achieved by the sliding fit between the upper section 4a with a small diameter and the middle section 4b with the piston cavity, the sliding fit between the lower section 4c with the positioning boss 9 and the positioning pin 10 of the base plate 8, and the first positioning pin 16 between the middle section 4b with the base 2. The piston positioning is more stable and reliable.

[0024] In use, the workpiece 7 is placed on the support base 6, and the support base 6 abuts against the lower end face of the workpiece 7. The piston 4 is moved by hydraulic oil, which simultaneously pulls the pull rod 3 and the conical head to tighten the tensioning sleeve 5 against the inner hole of the workpiece 7, thus achieving the clamping and positioning of the workpiece 7. The workpiece 7 is installed stably and firmly, and is not easy to loosen, ensuring the processing quality and accuracy of the workpiece 7.

[0025] The specific embodiments described herein are merely illustrative of the principles and effects of the invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this invention are still covered by the claims of this invention.

Claims

1. A gear grinding fixture, comprising a body, a base, a tensioning sleeve, a pull rod, and a piston, wherein the body and the base are detachably connected, and the base has a piston chamber for the piston to slide up and down, characterized in that: The base is covered with a bottom plate, and the upper surface of the bottom plate is provided with an annular positioning boss. The positioning boss extends into the lower end of the piston chamber, and a first sealing ring is provided between its outer circumferential surface and the inner circumferential surface of the piston chamber. The piston includes an upper section with a small diameter, a middle section with a large diameter, and a lower section with a small diameter connected in sequence. The outer circumferential surfaces of the upper section with a small diameter and the middle section with a large diameter are respectively provided with a second sealing ring and a third sealing ring between them and the inner circumferential surface of the piston cavity. The lower section with a small diameter extends downward into the positioning boss and a fourth sealing ring is provided between the circumferential surfaces of the two mating surfaces. The lower end face of the smaller diameter section is recessed with a positioning hole, and a positioning post is detachably connected to the base plate. The positioning post extends upward into the positioning hole and the two slide up and down in a sliding fit. A first positioning pin is also provided between the larger diameter section and the base.

2. The gear grinding fixture according to claim 1, characterized in that: The lower end face of the base plate is recessed with an installation hole that communicates with the central area of ​​the positioning boss. The positioning post is inserted into the installation hole and the positioning boss in sequence. A locking sleeve is also screwed into the installation hole. The locking sleeve and the positioning post are fixedly connected by bolts.

3. The gear grinding fixture according to claim 2, characterized in that: The mounting hole has a first stepped surface, and the lower end of the positioning post has a limiting protrusion, which abuts against the first stepped surface.

4. The gear grinding fixture according to claim 1, characterized in that: A second positioning pin is provided between the base plate and the base.

5. The gear grinding fixture according to claim 1, characterized in that: The pull rod passes through the body, with its upper end fixedly connected to the tensioning sleeve and its lower end extending into the piston cavity and directly connected to the upper section of the small diameter.

6. The gear grinding fixture according to claim 1, characterized in that: The main body is provided with a second stepped surface, and a support seat for abutting and supporting the lower end surface of the workpiece is fitted on the second stepped surface. The support seat is detachably connected to the main body. The upper end of the main body is provided with a tapered head that cooperates with the tensioning sleeve.

7. The gear grinding fixture according to claim 1, characterized in that: The base plate has an oil passage for connecting the outside to the piston chamber.

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