Gear grinding clamp

Abstract

The gear grinding clamp comprises a body, a base, a tensioning sleeve, a pull rod and a piston, the body is detachably connected with the base, and a piston cavity is formed in the base. A bottom plate covers the lower end of the base, an annular positioning boss is arranged on the upper end face of the bottom plate and extends into the lower end of the piston cavity, and a first sealing ring is arranged between the outer circumferential face of the positioning boss and the inner circumferential face 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 from top to bottom; a second sealing ring and a third sealing ring are respectively arranged between the outer peripheral surfaces of the small-diameter upper section and the large-diameter middle section and the inner peripheral surface of the piston cavity; the small-diameter lower section extends downwards into the positioning boss, and a fourth sealing ring is arranged between the matched circumferential surfaces of the small-diameter lower section and the positioning boss; a positioning hole is concavely formed in the lower end face of the small-diameter lower section, a positioning column is correspondingly and detachably connected to the bottom plate, and the positioning column upwards extends into the positioning hole to form up-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] The utility model relates to gear part machining technical field especially relates to a gear grinding fixture. BACKGROUND

[0002] With the high -speed development of modern machinery industry and the continuous progress of science and technology, promote the gear transmission equipment to the high -speed, heavy load, high power, high efficiency, high -precision direction development, the higher requirement of machining precision to gear, utilize the gear grinding machine to gear tooth surface grinding process is called gear grinding, the effect of gear grinding is mainly used for eliminating the deformation of wheel tooth after heat treatment and improving gear precision, the precision of wheel tooth after grinding can reach 6~3 level (JB179-83) or higher, and gear grinding is essential, gear transmission is the transmission link of each mechanical part, and it is the basis for mechanical equipment to realize normal and efficient work.

[0003] The existing technology's gear grinding fixture generally adopts hydraulic tensioning structure, such as the Chinese patent with the patent number ZL201820143758.4 proposes a gear grinding fixture, which comprises a base, a piston, a pull rod, a tensioning sleeve and a body, the base is detachably connected with the body, and a containing cavity containing the piston is formed in the base; the body is provided with an inner hole containing the pull rod, one end of the pull rod is fixedly connected with the piston, and the other end of the pull rod extends out of the body. The containing cavity is divided into two oil chambers by the piston, and in the above structure, the piston adopts a two-section stepped structure, and the positioning and guiding part is located on the oil chamber side, so that the positioning and guiding performance is poor and the stability is not enough. UTILITY MODEL CONTENTS

[0004] The utility model solves the technical problem in the prior art, and provides a gear grinding fixture, which improves the positioning stability of the internal piston, ensures more reliable work of the piston, and improves the service life.

[0005] The technical scheme of the utility model is as follows:

[0006] The gear grinding fixture provided by the utility model comprises a body, a base, a tensioning sleeve, a pull rod and a piston, the body is detachably connected with the base, a piston cavity for the piston to slide up and down is formed in the base, and the base lower end cover is provided with a bottom plate, the bottom plate upper end face is provided with an annular positioning boss, the positioning boss extends into the lower end of the piston cavity, a first sealing ring is arranged between the outer circumferential surface of the positioning boss and the inner circumferential surface of the piston cavity, and the bottom plate lower end face is provided with a bottom plate lower end cover.

[0007] The piston comprises a small-diameter upper section, a large-diameter middle section and a small-diameter lower section which are connected in sequence from top to bottom; the outer circumferential surfaces of the small-diameter upper section and the large-diameter middle section are respectively provided with a second sealing ring and a third sealing ring between the inner circumferential surface of the piston cavity; and the small-diameter lower section extends into the positioning boss downward, and a fourth sealing ring is arranged between the circumferential surfaces of the small-diameter lower section and the positioning boss.

[0008] The lower end surface of the small-diameter lower section is concave and provided with a positioning hole, a positioning column is detachably connected to the upper surface of the base plate, the positioning column extends upward into the positioning hole and the two form an upper-lower sliding fit, and a first positioning pin is further arranged between the large-diameter middle section and the base.

[0009] The structure designs the piston into a multi-section form with a large middle section and small end sections, matches the small-diameter upper section, the large-diameter middle section and the inner circumferential surface of the piston cavity, matches the positioning boss and the positioning column structure of the small-diameter lower section and the base plate, and combines the first positioning pin between the large-diameter middle section and the base, so as to jointly realize the positioning and guiding of the piston, enhance the positioning stability of the piston and ensure the reliable operation of the piston.

[0010] Further, the lower end surface of the base plate is concave and provided with a mounting hole penetrating the central area of the positioning boss, the positioning column penetrates the mounting hole and the positioning boss in sequence, and a locking sleeve is screwed into the mounting hole and fixedly connected with the positioning column by bolts.

[0011] Further, the mounting hole is provided with a first step surface, the lower end of the positioning column is provided with a limiting protrusion, and the limiting protrusion abuts against the first step surface, so as to enhance the limiting and stopping of the positioning column.

[0012] Further, the base plate and the base are provided with a second positioning pin, so as to improve the positioning and mounting precision of the base plate and the base.

[0013] Further, the pull rod penetrates the body, the upper end of the pull rod is fixedly connected with the expansion sleeve, and the lower end of the pull rod extends into the piston cavity and is directly connected with the small-diameter upper section.

[0014] Further, the body is provided with a second step surface, a support seat for abutting against and supporting the lower end surface of the workpiece is sleeved on the second step surface, and the support seat is detachably connected with the body; and the upper end of the body is provided with a conical head matched with the expansion sleeve.

[0015] Further, the base plate is provided with an oil channel for connecting the outside and the piston cavity.

[0016] The utility model discloses the beneficial effects are:

[0017] The utility model discloses a small diameter upper section, large diameter middle section and small diameter lower section constitute the piston, utilize the cooperation of small diameter upper section, large diameter middle section and piston cavity, the cooperation of small diameter lower section and the annular positioning boss center of bottom plate, the cooperation of the positioning hole of small diameter lower section and the positioning column of bottom plate, and the first positioning pin between large diameter middle section and base jointly realize the positioning of piston, increase the positioning guide length, have stable and reliable positioning effect, realize the stable up and down movement of piston without deviation, rotation, and the work is more stable and reliable, and the installation is convenient, and the labor-saving, fast. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the sectional view schematic drawing of the utility model.

[0019] Figure 2 It is Figure 1 the local enlarged schematic drawing. PREFERRED EMBODIMENT

[0020] The utility model will be further described with reference to the drawings:

[0021] Referring to Figure 1 and Figure 2 , the gear grinding fixture described in the embodiment, including body 1, base 2, tensioner 5, pull rod 3, piston 4, body 1 is detachably connected with base 2, the piston cavity is seted up in base 2, the bottom plate 8 is equipped with the bottom plate 8 on the lower end cover of base 2, and the oil channel 8a for communicating outside and piston cavity is seted up on the bottom plate 8.

[0022] The bottom plate 8 upper end surface is equipped with annular positioning boss 9, and positioning boss 9 extends into the lower end of piston cavity, and the outer circumferential surface between it and the inner circumferential surface of piston cavity is equipped with first sealing ring 12.

[0023] The piston 4 includes small diameter upper section 4a, large diameter middle section 4b and small diameter lower section 4c connected in sequence up and down, and the outer circumferential surface of small diameter upper section 4a and large diameter middle section 4b is equipped with second sealing ring 13 and third sealing ring 14 between the inner circumferential surface of piston cavity respectively, and the circumferential surface between small diameter lower section 4c and positioning boss 9, which are matched, is equipped with fourth sealing ring 15.

[0024] The lower end surface of the small-diameter lower section 4c is concave and has a positioning hole 18, and the upper end surface of the bottom plate 8 is concave and has a positioning column 10 which is detachably connected to the positioning hole 18 and which extends into the positioning hole 18 in a sliding fit. Specifically, the lower end surface of the bottom plate 8 is concave and has an installation hole 19 which penetrates the center area of the positioning boss 9, and the positioning column 10 extends into the installation hole 19 and the positioning boss 8 in sequence; the installation hole 19 further has a locking sleeve 11 which is screwed into the installation hole 19 and which is fixedly connected to the positioning column 10 by a bolt (not shown in the drawing). The installation hole 19 has a first step surface, and the lower end of the positioning column 10 has a limiting protrusion 10a which abuts against the first step surface.

[0025] The large-diameter middle section 4b and the base 2 further have a first positioning pin 16, and the bottom plate 8 and the base 2 have a second positioning pin 17.

[0026] The pull rod 3 extends through the body 1, and the upper end of the pull rod 3 is fixedly connected to the expansion sleeve 5, and the lower end of the pull rod 3 extends into the piston cavity and is directly connected to the small-diameter upper section 4a.

[0027] The body 1 has a second step surface, and the second step surface has a support seat 6 which is used to abut against and support the lower end surface of the workpiece 7, and the support seat 6 is detachably connected to the body 1; and the upper end of the body 1 has a conical head which cooperates with the expansion sleeve 5.

[0028] In the structure, the piston 4 is divided into three sections, i.e., the small-diameter upper section 4a, the large-diameter middle section 4b and the small-diameter lower section 4c, and the upper and lower end surfaces of the large-diameter middle section 4b form oil chambers with the piston cavity and the positioning boss 9 of the bottom plate 8, respectively, so that the piston 4 is pushed by changing the internal hydraulic oil pressure; meanwhile, sealing rings are arranged on the cooperation surfaces of the sections, the piston cavity and the positioning boss 9, so that the structure has good sealing performance; the positioning and guiding of the piston 4 are realized by the sliding fit of the small-diameter upper section 4a and the large-diameter middle section 4b with the piston cavity, the sliding fit of the small-diameter lower section 4c with the positioning boss 9 and the positioning column 10 of the bottom plate 8, and the first positioning pin 16 between the large-diameter middle section 4b and the base 2, so that the positioning of the piston is more stable and reliable.

[0029] In use, the workpiece 7 is sleeved on the support seat 6, the support seat 6 abuts against the lower end surface of the workpiece 7, the piston 4 is moved by the hydraulic oil, the pull rod 3 and the conical head are simultaneously pulled to make the expansion sleeve 5 expand the inner hole of the workpiece 7, and the workpiece 7 is clamped and positioned, so that the workpiece 7 is stably and firmly installed, is not easy to be loosened, and guarantees the machining quality and precision of the workpiece 7.

[0030] The specific embodiments described herein are merely illustrative of the principles of the present application and its efficacy, and are not intended to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical concept disclosed by the present application are still covered by the claims of the present application.

Claims

1. A gear grinding fixture, comprising a body, a base, a tensioning sleeve, a pull rod, a piston, the body is detachably connected with the base, a piston cavity is formed in the base for the piston to slide up and down, characterized in that: The lower end cover of the base is provided with a bottom plate, the upper end face of the bottom plate is provided with an annular positioning boss, 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 segment, a large-diameter middle segment and a small-diameter lower segment connected in sequence from top to bottom; the outer circumferential surfaces of the small-diameter upper segment and the large-diameter middle segment are respectively provided with a second sealing ring and a third sealing ring between the outer circumferential surfaces and the inner circumferential surface of the piston cavity; the small-diameter lower segment extends downward into the positioning boss, and a fourth sealing ring is arranged between the circumferential surfaces of the small-diameter lower segment and the positioning boss; The lower end face of the small-diameter lower segment is concave and provided with a positioning hole, a positioning column is detachably connected to the bottom plate in correspondence with the positioning hole, the positioning column extends upward into the positioning hole, and the positioning hole and the positioning column are in sliding cooperation; the large-diameter middle segment and the base are further provided with a first positioning pin.

2. The gear grinding fixture of claim 1, wherein: The lower end face of the bottom plate is concave and provided with a mounting hole penetrating through the central region of the positioning boss, the positioning column extends into the mounting hole and the positioning boss in sequence; a locking sleeve is screwed into the mounting hole, and the locking sleeve and the positioning column are fixedly connected through bolts.

3. The gear grinding fixture of claim 2, wherein: The mounting hole is provided with a first step surface, the lower end of the positioning column is provided with a limiting protrusion, and the limiting protrusion abuts against the first step surface.

4. The gear grinding fixture of claim 1, wherein: The second positioning pin is arranged between the bottom plate and the base.

5. The gear grinding fixture of claim 1, wherein: The pull rod extends through the body, the upper end of the pull rod is fixedly connected with the expansion sleeve, and the lower end of the pull rod extends into the piston cavity and is directly connected with the small-diameter upper segment.

6. The gear grinding fixture of claim 1, wherein: The body is provided with a second step surface, a support seat for abutting against and supporting the lower end face of the workpiece is sleeved on the second step surface, and the support seat is detachably connected with the body; the upper end of the body is provided with a conical head matched with the expansion sleeve.

7. The gear grinding fixture of claim 1, wherein: The bottom plate is provided with an oil channel for connecting the outside and the piston cavity.

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