Clamp for gear hobbing

Abstract

The utility model relates to a fixture for gear hobbing, which comprises a base, a lower cover, a floating upper cover and a central column which are coaxially arranged, the lower cover is fixed at the upper end of the base, the floating upper cover is oppositely arranged above the lower cover, a gear is positioned between the floating upper cover and the lower cover during hobbing, and the central column penetrates through an inner hole of the gear; the floating upper cover is of a cylindrical structure, an inner ring groove is formed in the inner wall of the floating upper cover, an outer ring groove is formed in the outer wall of the floating upper cover, the inner ring groove and the outer ring groove are arranged in a staggered mode, and the diameter of the bottom of the inner ring groove is larger than that of the bottom of the outer ring groove. According to the gear hobbing device, the perpendicularity error and the parallelism error of the gear can be corrected during hobbing, so that the force causing the radial deflection and the end face parallelism error of the gear is transmitted to the floating upper cover and counteracted, the center positioning precision and the tooth groove amplitude of the gear are ensured, and the gear hobbing machining precision is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to gear processing fixture technical field, concretely relates to a gear hobbing fixture for gear hobbing. BACKGROUND

[0002] Gear hobbing fixture is needed to fix gear in the hobbing step of gear processing process, and the common gear hobbing fixture generally includes upper cover, lower cover and center column, and the three cooperate to realize the fixation of gear, but in the actual processing process, the gear tooth groove amplitude cannot be guaranteed by this clamping mode. SUMMARY

[0003] The utility model discloses a gear hobbing fixture, which solves the problem of low gear hobbing machining precision.

[0004] The utility model discloses a gear hobbing fixture, which solves the problem of low gear hobbing machining precision.

[0005] A gear hobbing fixture includes a base, a lower cover, a floating upper cover and a center column arranged coaxially, the lower cover is fixed to the upper end of the base, the floating upper cover is arranged above the lower cover, the gear is located between the floating upper cover and the lower cover during hobbing, and the center column passes through the inner hole of the gear.

[0006] The floating upper cover is a cylindrical structure, an inner ring groove is arranged on the inner wall of the floating upper cover, and an outer ring groove is arranged on the outer wall of the floating upper cover, the inner ring groove and the outer ring groove are arranged in a staggered manner, and the diameter of the bottom of the inner ring groove is greater than the diameter of the bottom of the outer ring groove.

[0007] Further, the groove depth of the inner ring groove is greater than one half of the wall thickness of the floating upper cover and less than the wall thickness of the floating upper cover.

[0008] Further, the groove depth of the outer ring groove is greater than one half of the wall thickness of the floating upper cover and less than the wall thickness of the floating upper cover.

[0009] Further, the wall thickness of the bottom of the inner ring groove is equal to the wall thickness of the bottom of the outer ring groove and equal to the wall thickness between adjacent inner ring grooves and outer ring grooves.

[0010] Further, the corners of the bottoms of the inner ring groove and the outer ring groove are arc chamfers.

[0011] Further, the top of the base is provided with a convex seat integrated with the base, and the lower cover is sleeved on the convex seat.

[0012] The lower cover is provided with a radial outer assembly hole, and the outer wall of the boss is provided with an outer locking ring groove matched with the outer assembly hole.

[0013] Further, a positioning tooth ring is fixedly sleeved on the outer wall of the center column and matched with the inner hole of the gear.

[0014] Further, the upper end of the center column extends into the floating upper cover, and the lower end extends into the base and is connected with the top of the pull rod in the base.

[0015] Further, the boss is provided with an inner assembly hole, and the outer wall of the center column is provided with an inner locking ring groove matched with the inner assembly hole.

[0016] Further, the bottom of the base is provided with a mounting hole.

[0017] After the above technical scheme is adopted, the present application has the following beneficial effects:

[0018] The inner ring groove and the outer ring groove arranged in a staggered manner are arranged on the floating upper cover, so that the floating upper cover has a certain elastic deformation capacity, thereby correcting the perpendicularity and parallelism error of the gear during gear hobbing, transmitting the force causing the radial deflection of the gear and the end face parallelism error to the floating upper cover and offsetting the force, thereby ensuring the center positioning accuracy of the gear and the tooth groove amplitude and improving the machining precision of the gear hobbing. BRIEF DESCRIPTION OF DRAWINGS

[0019] The present application will be further described below in combination with the drawings and embodiments.

[0020] Figure 1 is a cross-sectional view of the gear hobbing fixture of the preferred embodiment of the present application;

[0021] Figure 2 is a cross-sectional view of the floating upper cover of the gear hobbing fixture of the preferred embodiment of the present application;

[0022] Figure 3 is a cross-sectional view of the lower cover of the gear hobbing fixture of the preferred embodiment of the present application;

[0023] Figure 4 is a cross-sectional view of the center column of the gear hobbing fixture of the preferred embodiment of the present application;

[0024] Figure 5 is a cross-sectional view of the base of the gear hobbing fixture of the preferred embodiment of the present application;

[0025] In the figure: base 1, lower cover 2, floating upper cover 3, central column 4, inner ring groove 5, outer ring groove 6, upper seat 7, convex seat 8, outer assembly hole 9, outer locking ring groove 10, internal spline 11, pull rod 12, inner assembly hole 13, inner locking ring groove 14, mounting hole 15, gear 16. Specific embodiments

[0026] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0027] Therefore, the detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0028] As Figures 1-5 shown, a fixture for gear hobbing includes a coaxially arranged base 1, lower cover 2, floating upper cover 3 and central column 4. The lower cover 2 is fixed to the upper end of the base 1, and the floating upper cover 3 is disposed opposite above the lower cover 2. During gear hobbing, the gear 16 is located between the floating upper cover 3 and the lower cover 2, and the central column 4 passes through the inner hole of the gear 16. The floating upper cover 3 is of a cylindrical structure, with an inner ring groove 5 provided on its inner wall and an outer ring groove 6 provided on its outer wall. The inner ring groove 5 and the outer ring groove 6 are arranged in a staggered manner, and the diameter at the bottom of the inner ring groove 5 is larger than the diameter at the bottom of the outer ring groove 6.

[0029] Among them, an upper seat 7 is provided at the upper end of the cylindrical main body of the floating upper cover 3 to facilitate connection with the gear hobbing equipment.

[0030] The floating upper cover 3 has a certain elastic deformation performance, which can offset the forces causing radial deflection and end face parallelism error of the gear 16. To achieve this purpose, the depth of the inner ring groove 5 is greater than half of the wall thickness of the floating upper cover 3 and less than the wall thickness of the floating upper cover 3.

[0031] The depth of the outer ring groove 6 is greater than half of the wall thickness of the floating upper cover 3 and less than the wall thickness of the floating upper cover 3.

[0032] The floating upper cover 3 needs to have a certain elastic deformation performance through the combined setting of the inner ring groove 5 and the outer ring groove 6.

[0033] On the basis of meeting the above conditions, the greater the wall thickness of the inner ring groove 5 groove bottom, the greater the wall thickness of the same outer ring groove 6 groove bottom, the higher the light of the floating upper ring, more difficult to appear broken problem.

[0034] Preferably, in order to ensure the balance of the elastic deformation ability of the floating upper cover 3, the wall thickness of the inner ring groove 5 groove bottom is equal to the wall thickness of the outer ring groove 6 groove bottom, and is equal to the wall thickness between adjacent inner ring groove 5 and outer ring groove 6.

[0035] In order to ensure the strength of the floating upper cover 3, the corners of the inner ring groove 5 and the outer ring groove 6 groove bottom are arc chamfered.

[0036] Among them, the arc chamfering, the inner convex platform formed by the floating upper cover 3 outer wall and the inner ring groove 5 corresponding to the floating upper cover 3 inner wall and the inner convex platform formed by the outer ring groove 6 corresponding to the floating upper cover 3 inner wall are all quenched, which further improves the strength of the floating upper cover 3.

[0037] The lower cover 2 is provided to realize the support of the gear 16, and in order to realize the cooperation of the lower cover 2 and the base 1, the top of the base 1 is provided with a convex seat 8 integrated with it, and the lower cover 2 is sleeved on the convex seat 8.

[0038] The lower cover 2 is a cylindrical structure, which is sleeved on the convex seat 8 and coaxially arranged with the convex seat 8.

[0039] In order to realize the fixation of the lower cover 2 and the convex seat 8, the outer assembly hole 9 is arranged on the lower cover 2 in the radial direction, and the outer wall of the convex seat 8 is provided with the outer locking ring groove 10 matched with the outer assembly hole 9.

[0040] Preferably, the outer assembly hole 9 is a threaded hole, and the bolt is installed from the outside to the inside of the outer assembly hole 9, and the inner end of the bolt extends into the outer locking ring groove 10, that is, the fixation of the convex seat 8 and the lower cover 2 can be realized.

[0041] In order to realize the fixation of the gear 16, the inner spline 11 is fixedly sleeved on the outer wall of the center column 4, and the inner spline 11 is matched with the inner hole of the gear 16.

[0042] When hobbing is carried out, the gear 16 is sleeved on the inner spline 11, and the teeth of the inner spline 11 are engaged with the teeth of the inner ring of the gear 16, so that the gear 16 is driven to rotate by the clamp to carry out hobbing.

[0043] In order to realize the connection of the center column 4 and the base 1, the upper end of the center column 4 extends into the floating upper cover 3, and the lower end extends into the base 1 and is connected with the top of the draw bar 12 in the base 1.

[0044] The draw bar 12 is arranged in the base 1, the top of the draw bar 12 is provided with a threaded hole, the lower end of the center column 4 passes through the center hole of the convex seat 8 and is assembled in the threaded hole at the top of the draw bar 12, so as to pull the center column 4 downward.

[0045] In order to realize the connection of the center column 4 and the boss 8, the inner assembly hole 13 is arranged on the boss 8, and the outer locking ring groove 14 matched with the inner assembly hole 13 is arranged on the outer wall of the center column 4.

[0046] Specifically, the inner assembly hole 13 is located in the radial direction of the boss 8 and is inclined in the direction of the inner end downward, and the groove bottom of the inner locking ring groove 14 is an inclined surface inclined inwardly from the upper end.

[0047] Before the lower cover 2 is installed, the dowel pin can be inserted into the inner assembly hole 13, and the inner end of the dowel pin is clamped in the inner locking ring groove 14. After the upper and lower covers 2 are subsequently installed, the lower cover 2 can limit the outward movement of the dowel pin, prevent the dowel pin from exiting from the inner locking ring groove 14, and ensure the stability of the connection of the center column 4 and the boss 8, i.e. the base 1.

[0048] In order to be able to install the base 1 on the gear rolling equipment, the outer periphery of the bottom of the base 1 is provided with the mounting hole 15.

[0049] The utility model discloses a simple overall structure, convenient to use. When carrying out gear rolling processing, the lower cover 2 and the center column 4 are fixed on the base 1 in advance, the floating upper cover 3 is installed on the gear rolling equipment and is opposite to the lower cover 2, at this time, the gear 16 is sleeved on the inner spline 11 of the center column 4, the upper cover is moved downward until the upper cover is pressed on the gear 16, at this time, the gear 16 can be carried out gear rolling processing. In this process, through the design of the inner ring groove 5 and the outer ring groove 6 on the upper cover, the radial deflection reaction force and the displacement force caused by the end face parallelism error can be offset, the positioning accuracy of the gear 16 and the tooth groove amplitude during fine processing are guaranteed.

[0050] With the above ideal embodiment according to the utility model as the inspiration, through the above description, the relevant staff can make various changes and modifications without deviating from the technical idea of the utility model. The technical scope of the utility model is not limited to the content in the specification, and the technical scope must be determined according to the scope of claims.

Claims

1. A gear hobbing jig characterized by, It comprises a base (1), a lower cover (2), a floating upper cover (3) and a center column (4), the lower cover (2) is fixed on the upper end of the base (1), the floating upper cover (3) is oppositely arranged above the lower cover (2), the gear (16) is located between the floating upper cover (3) and the lower cover (2) during hobbing, and the center column (4) passes through the inner hole of the gear (16). The floating upper cover (3) is a cylindrical structure, an inner ring groove (5) is arranged on the inner wall, and an outer ring groove (6) is arranged on the outer wall, the inner ring groove (5) and the outer ring groove (6) are arranged in a staggered manner, and the diameter of the bottom of the inner ring groove (5) is greater than that of the bottom of the outer ring groove (6).

2. The gear generator jig according to claim 1, characterized by The groove depth of the inner ring groove (5) is greater than one half of the wall thickness of the floating upper cover (3) and less than the wall thickness of the floating upper cover (3).

3. The gear generator jig according to claim 1, wherein The groove depth of the outer ring groove (6) is greater than one half of the wall thickness of the floating upper cover (3) and less than the wall thickness of the floating upper cover (3).

4. The gear generator fixture of claim 1 wherein, The wall thickness of the bottom of the inner ring groove (5) is equal to the wall thickness of the bottom of the outer ring groove (6), and is equal to the wall thickness between adjacent inner ring grooves (5) and outer ring grooves (6).

5. The gear generator jig according to claim 1, wherein The corners of the bottoms of the inner ring groove (5) and the outer ring groove (6) are arc chamfers.

6. The gear generator fixture of claim 1 wherein, The top of the base (1) is provided with a convex seat (8) integral therewith, and the lower cover (2) is sleeved on the convex seat (8). An outer assembly hole (9) is arranged on the lower cover (2) in the radial direction, and an outer locking ring groove (10) is arranged on the outer wall of the convex seat (8) and matched with the outer assembly hole (9).

7. The gear generator fixture of claim 1 wherein, An inner spline (11) is fixedly sleeved on the outer wall of the center column (4), and the inner spline (11) is matched with the inner hole of the gear (16).

8. The gear generator fixture of claim 1 wherein, The upper end of the center column (4) extends into the floating upper cover (3), and the lower end extends into the base (1) and is connected to the top of the pull rod (12) in the base (1).

9. The gear generator jig according to claim 6, wherein An inner assembly hole (13) is arranged on the convex seat (8), and an inner locking ring groove (14) is arranged on the outer wall of the center column (4) and matched with the inner assembly hole (13).

10. The gear generator fixture of claim 1 wherein, An installation hole (15) is arranged on the periphery of the bottom of the base (1).

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