Female shaft fork fairway positioning device with high precision and zero clearance fit

Abstract

The utility model provides a high-precision gapless fit female shaft fork ball groove positioning device which is applied to a female shaft fork quenching process. Comprising a floating positioning seat, the floating positioning seat comprises a base and a positioning seat body, and the positioning seat body is arranged on the base; a plurality of special-shaped bosses are arranged on the peripheral surface of the positioning seat body and are matched with a female shaft fork ball groove; a boss through hole is formed in the special-shaped boss, a steel ball, a spring and a plug are arranged in the boss through hole, the steel ball is arranged at one end of the boss through hole, a part of the steel ball is located outside the boss through hole, and the rest of the steel ball is located inside the boss through hole. The plug is arranged at the other end of the through hole of the boss, and the spring is arranged between the plug and the steel ball. According to the utility model, the positioning precision is improved, the layer depth fluctuation range after heat treatment is reduced, the layer depth is 0.1, the tensile strength of a workpiece can be effectively improved, and the problems of large layer depth fluctuation range and reduced working intensity after heat treatment are effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of quenching equipment for the production of female shaft forks, in particular to a female shaft fork ball track positioning device with high-precision and gapless fit. Background Art

[0002] As Figures 1-3 shown, the traditional quenching method for the handle part of the female shaft fork is that the transfer claw moves the female shaft fork 1 to the floating tray 3 in the middle of the limiting disc 2. The pressing device above descends to press down the female shaft fork 1 so that the outer circle 1013 of the workpiece bowl part falls into the inner hole of the limiting disc 2. The rotating device below the floating tray 3 drives the female shaft fork 1 to rotate. Then, the inductor penetrates into the spline hole 1020 of the handle body 102 of the female shaft fork from top to bottom to quench the internal spline. After quenching, the pressing device retracts, the floating tray 3 resets, and the transfer claw removes the workpiece.

[0003] This kind of processing uses the outer circle of the workpiece bowl part for positioning. When rotating, the runout of the workpiece depends on the concentricity between the outer circle of the bowl part and the spline hole. In fact, the spline hole is machined based on the inner cavity of the workpiece. The concentricity between the outer circle of the workpiece bowl part and the spline hole is relatively large, which indirectly leads to a relatively large runout of the workpiece. After heat treatment, the fluctuation range of the layer depth of the workpiece is about 0.3, the layer depth fluctuation range is large, and the strength of the workpiece is reduced. Summary of the Utility Model

[0004] In view of the above-mentioned disadvantages of the prior art, the technical problem to be solved by the utility model is to provide a female shaft fork ball track positioning device with high-precision and gapless fit. Through the gapless fit connection between the positioning device and the workpiece with high precision, the pressing device in the prior art is not required for auxiliary pressing during the quenching process, the fluctuation range of the layer depth of the workpiece after heat treatment is reduced, and the tensile strength of the workpiece is improved.

[0005] To achieve the above object, the utility model provides a female shaft fork ball track positioning device with high-precision and gapless fit, which is applied to the quenching process of female shaft forks; it includes a floating positioning seat, and the floating positioning seat includes a base and a positioning seat body, and the positioning seat body is arranged on the base; a plurality of special-shaped convex platforms are arranged on the outer peripheral surface of the positioning seat body, and the plurality of special-shaped convex platforms are matched with the ball tracks of the female shaft forks; a convex platform through hole is opened in the special-shaped convex platform, and a steel ball, a spring, and a plug are arranged in the convex platform through hole. The steel ball is arranged at one end of the convex platform through hole, and a part of the steel ball is outside the convex platform through hole, and the remaining part is inside the convex platform through hole; the plug is arranged at the other end of the convex platform through hole, and the spring is arranged between the plug and the steel ball.

[0006] Preferably, an internal thread is opened on the inner wall of the convex platform through hole far from the steel ball, an external thread is arranged on the outer peripheral surface of the plug, and the plug is connected in the convex platform through hole through the internal thread and the external thread to adjust the tightness of the spring.

[0007] Preferably, the number of through holes in a special-shaped boss is two, and the two through holes in the boss are arranged along the height direction.

[0008] Preferably, a plurality of base connection holes and positioning grooves are formed in the base, and the base is connected to a lifting cylinder below the base through the base connection holes and the positioning grooves.

[0009] Preferably, the positioning seat body is cylindrical; the number of the special-shaped bosses is three, and the three special-shaped bosses are arranged on the outer peripheral surface of the positioning seat body at an angle of 120°.

[0010] Preferably, the female shaft fork includes a female shaft fork main body and a female shaft fork handle body. A main body cavity is arranged in the female shaft fork main body, a spline hole is arranged on the female shaft fork handle body, and the main body cavity is communicated with the spline hole; internal splines are arranged on the inner wall of the spline hole; a plurality of female shaft fork ball channels are arranged on the inner wall of the main body cavity, and a plurality of special-shaped bosses are clamped in the female shaft fork ball channels.

[0011] Preferably, a positioning disc and a pressing head assembly are further included. The positioning disc is arranged on the upper side of the floating positioning seat. A positioning disc special-shaped hole is formed in the positioning disc, and the shape of the positioning disc special-shaped hole matches the shape of the floating positioning seat. The floating positioning seat can penetrate through the positioning disc special-shaped hole; the pressing head assembly is arranged on the upper side of the positioning disc in a liftable manner and is used for applying a downward pressure to the female shaft fork.

[0012] Preferably, a lifting drive cylinder is connected to the pressing head assembly, and the lifting drive cylinder is used to drive the pressing head assembly to lift.

[0013] As described above, the female shaft fork ball path positioning device with high-precision clearance-free fit involved in the present invention has the following beneficial effects:

[0014] 1. For the female shaft fork ball path positioning device with high-precision clearance-free fit involved in the present invention, the device is directly inserted into the main body cavity of the female shaft fork, and the special-shaped bosses of the device are clamped in the female shaft fork ball paths in a clearance-free fit, replacing the problem in the prior art that the workpiece runout is large when positioning through the outer circle of the workpiece bowl part, and the layer depth is about 0.3 after heat treatment. The positioning accuracy is improved, the fluctuation range of the layer depth after heat treatment is reduced, the layer depth is 0.1, the tensile strength of the workpiece can be effectively improved, and the problems of large fluctuation range of the layer depth after heat treatment and reduced working strength are effectively solved.

[0015] 2. The device of the present invention is directly inserted into the main body cavity of the female shaft fork. Through the guiding structure of the special-shaped bosses, it can be independent of a dedicated positioning station, reduce costs, optimize the production process, and improve production efficiency.

[0016] 3. The device of the present utility model is directly inserted into the main cavity of the female shaft fork, and the special-shaped boss of the device is clamped in the ball track of the female shaft fork without clearance, eliminating the need for the pressing component to always press during rotary hardening in the prior art, making the operation more convenient.

[0017] 3. The high-precision clearance-free female shaft fork ball track positioning device of the present utility model can be extended to the production process of male shaft forks and is applicable to all AAR / GI joint types. Brief Description of the Drawings

[0018] Figure 1 is the first-angle schematic diagram of the female shaft fork hardening in the prior art of the present utility model;

[0019] Figure 2 is the second-angle schematic diagram of the female shaft fork hardening in the prior art of the present utility model;

[0020] Figure 3 is the third-angle schematic diagram of the female shaft fork hardening in the prior art of the present utility model;

[0021] Figure 4 is the space schematic diagram of the high-precision clearance-free female shaft fork ball track positioning device of the present utility model;

[0022] Figure 5 is Figure 4 the cross-sectional view along A-A in;

[0023] Figure 6 is Figure 4 the cross-sectional view along B-B in;

[0024] Figure 7 is the connection schematic diagram of the female shaft fork ball track positioning device and the female shaft fork in the present utility model;

[0025] Figure 8 is the connection schematic diagram of the female shaft fork during the hardening process in the present utility model;

[0026] Figure 9 is the space schematic diagram of the positioning disc of the high-precision clearance-free female shaft fork ball track positioning device of the present utility model.

[0027] Description of the Reference Numerals:

[0028] 1. Female shaft fork; 101. Female shaft fork body; 1011. Female shaft fork ball track; 1012. Main body cavity; 1013. Outer circle of workpiece bowl part; 102. Female shaft fork handle body; 1020. Spline hole; 2. Limiting plate; 3. Floating tray; 4. Base; 401. Base connection hole; 402. Positioning groove; 5. Positioning seat body; 6. Special-shaped boss; 601. Boss through hole; 7. Steel ball; 8. Plug; 9. Spring; 10. Positioning plate; 1001. Special-shaped hole of positioning plate; 11. Press head assembly. Detailed implementation mode

[0029] The following specific embodiments illustrate the implementation mode of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification.

[0030] It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the limiting conditions for the implementation of the present utility model. Therefore, they do not have any technical essence. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and the like cited in this specification are only for the convenience of narration and are not used to limit the scope for the implementation of the present utility model. The change or adjustment of their relative relationship, without substantial change in the technical content, should also be regarded as the scope in which the present utility model can be implemented.

[0031] As Figures 4-9 shown, the present utility model provides a female shaft fork ball track positioning device with high-precision gapless fit, which is applied to the quenching process of the female shaft fork 1; it includes a floating positioning seat, and the floating positioning seat includes a base 4 and a positioning seat body 5, and the positioning seat body 5 is arranged on the base 4; a plurality of special-shaped bosses 6 are arranged on the outer peripheral surface of the positioning seat body 5, and the plurality of special-shaped bosses 6 are matched with the female shaft fork ball track 1011; a boss through hole 601 is penetrated and opened in the special-shaped boss 6, and a steel ball 7, a spring 9 and a plug 8 are arranged in the boss through hole 601. The steel ball 7 is arranged at one end of the boss through hole 601, and a part of the steel ball 7 is outside the boss through hole 601, and the remaining part is inside the boss through hole 601; the plug 8 is arranged at the other end of the boss through hole 601, and the spring 9 is arranged between the plug 8 and the steel ball 7.

[0032] The female shaft fork ball track positioning device with high-precision gapless fit involved in the present utility model inserts the special-shaped boss 6 into the female shaft fork 1, and realizes the gapless contact between the special-shaped boss 6 and the female shaft fork ball track 1011 through the spring 9 and the steel ball 7, eliminating the abnormal noise and vibration that may occur during the rotary quenching of the female shaft fork 1, reducing the fluctuation range of the layer depth after heat treatment, and improving the tensile strength of the workpiece.

[0033] Preferably, as Figure 5 、 Figure 6 shown, internal threads are provided on the inner wall at one end of the boss through-hole 601 away from the steel ball 7, external threads are provided on the outer peripheral surface of the plug 8, and the plug 8 is connected in the boss through-hole 601 through the internal and external threads, and the tightness of the spring 9 is adjusted. Further, as Figure 4 、 Figure 5 、 Figure 8 shown, a tool groove is provided on the end surface of the plug 8 away from the spring 9. The tool groove can be a cross groove, a slotted groove, a triangular groove, a hexagonal groove, etc. Operators can screw the plug 8 out of or into the boss through-hole 601 through the corresponding tools, and adjust the tightness of the spring 9 according to the screwing depth of the plug 8 in the boss through-hole 601.

[0034] Preferably, as Figure 4 、 Figure 5 shown, the number of boss through-holes 601 on one special-shaped boss 6 is two, and the two boss through-holes 601 are arranged along the height direction.

[0035] Preferably, as Figure 4 、 Figure 7 、 Figure 8 shown, a plurality of base connection holes 401 and positioning grooves 402 are provided on the base 4. The base 4 is connected to the lifting cylinder below the base 4 through the base connection holes 401 and the positioning grooves 402. In this embodiment, the shape of the base 4 is cylindrical, and a plurality of base connection holes 401 are evenly distributed on the base 4 and penetrate through the base 4 up and down. The positioning groove 402 is provided on the bottom end surface of the base 4. Operators can first clamp the telescopic end of the lifting cylinder in the positioning groove 402 to achieve preliminary positioning, and then screw bolts or screws into the base connection holes 401 to realize the firm connection between the lifting cylinder and the base 4, so that the floating positioning seat can be driven to move in the up and down directions by the lifting cylinder. In this embodiment, a rotating assembly is further provided below the lifting cylinder, and the lifting cylinder is fixed on the rotating assembly. Through the rotating assembly and the lifting cylinder, the floating positioning seat can be rotated and lifted.

[0036] Further, as Figure 4 、 Figure 7As shown, in this embodiment, the number of base connection holes 401 is three, and the angular pitch between the three base connection holes 401 is 120°. The number of positioning grooves 402 is two, and the angular pitch between the two positioning grooves 402 is 180°. In other embodiments, the number of base connection holes 401 and the number of positioning grooves 402 depend on the circumstances.

[0037] Preferably, as Figure 5 , Figure 6 shown, the positioning seat body 5 is cylindrical; the number of special-shaped convex platforms 6 is three, and the three special-shaped convex platforms 6 are arranged on the outer peripheral surface of the positioning seat body 5 at an included angle of 120°. In other embodiments, the number of special-shaped convex platforms 6 can also be other numbers, as long as the number of special-shaped convex platforms 6 is the same as the number of female shaft fork ball tracks 1011. Further, in this embodiment, the convex platform through holes 601 extend along the tangential direction of the outer peripheral surface of the positioning seat body 5.

[0038] Preferably, as Figures 1-3 , Figure 7 shown, the female shaft fork 1 includes a female shaft fork main body 101 and a female shaft fork handle body 102. A main body cavity 1012 is provided in the female shaft fork main body 101, and a spline hole 1020 is provided on the female shaft fork handle body 102. The main body cavity 1012 communicates with the spline hole 1020; internal splines (not shown) are provided on the inner wall of the spline hole 1020; a plurality of female shaft fork ball tracks 1011 are provided on the inner wall of the main body cavity 1012, and a plurality of special-shaped convex platforms 6 are clamped in the female shaft fork ball tracks 1011.

[0039] Further, in this embodiment, the female shaft fork main body 101 and the female shaft fork handle body 102 are integral parts; the base 4, the positioning seat body 5, and the special-shaped convex platforms 6 are integral parts.

[0040] Preferably, as Figure 8 , Figure 9 shown, it further includes a positioning disc 10 and a pressing head assembly 11. The positioning disc 10 is arranged on the upper side of the floating positioning seat. A positioning disc special-shaped hole 1001 is provided in the positioning disc 10, and the shape of the positioning disc special-shaped hole 1001 matches the shape of the floating positioning seat. The floating positioning seat can penetrate through the positioning disc special-shaped hole 1001; the pressing head assembly 11 is arranged on the upper side of the positioning disc 10 in a liftable manner and is used to apply a downward pressure to the female shaft fork 1.

[0041] Preferably, a lifting drive cylinder is connected to the pressing head assembly 11, and the lifting drive cylinder is used to drive the pressing head assembly 11 to lift.

[0042] The high-precision clearance-free female shaft fork ball track positioning device involved in the present utility model has the following working steps:

[0043] S1: The operator according to the attachment Figures 4-9, and based on the descriptions of the above-mentioned components, produce and assemble each of the above-mentioned components;

[0044] S2: When quenching the female shaft fork 1, the female shaft fork 1 is moved from the material channel claw to the positioning plate 10, the lifting drive cylinder is started, and the lifting drive cylinder drives the pressure head assembly 11 to move downward, and the pressure head assembly 11 presses on the female shaft fork handle body 102;

[0045] S3: Start the jacking cylinder, the telescopic end of the jacking cylinder drives the base 4 to move upward, and then the floating positioning seat moves upward. The floating positioning seat passes through the positioning plate special-shaped hole 1001 and enters the main body cavity 1012 of the female shaft fork 1, and the special-shaped boss 6 on the floating positioning seat is clamped in the female shaft fork ball track 1011;

[0046] S3.1: When the special-shaped boss 6 enters the female shaft fork ball track 1011, the steel ball 7 is squeezed by the female shaft fork ball track 1011, and the spring 9 is in a compressed state; when the special-shaped boss 6 moves to a predetermined position, the spring 9 exerts an elastic force on the steel ball 7, and the steel ball 7 is squeezed by the spring 9 against the inner wall of the main body cavity 1012 of the female shaft fork 1. In this way, a gapless fit is formed between the floating positioning seat and the main body cavity 1012 of the female shaft fork 1;

[0047] S4: After a gapless fit is formed between the floating positioning seat and the main body cavity 1012 of the female shaft fork 1, the lifting drive cylinder drives the pressure head assembly 11 to move upward, and the pressure head assembly 11 moves away from the female shaft fork handle body 102;

[0048] S5: Start the rotating assembly, the rotating assembly drives the floating positioning seat to rotate through the jacking cylinder, the rotation of the floating positioning seat drives the rotation of the female shaft fork 1, and the inductor penetrates into the spline hole 1020 of the female shaft fork handle body 102 from top to bottom to quench the internal spline. After quenching is completed, the jacking cylinder drives the floating positioning seat to descend, the floating positioning seat passes through the positioning plate special-shaped hole 1001 downward, the floating positioning seat is separated from the main body cavity 1012 of the female shaft fork 1, and the female shaft fork 1 falls on the positioning plate 10, and finally it can be moved by the material channel claw.

[0049] Preferably, as Figure 8 shown, when the material channel claw moves the female shaft fork 1 to the positioning plate 10 in step S2, align the female shaft fork ball track 1011 with the positioning plate special-shaped hole 1001, which is convenient for the floating positioning seat to penetrate through the positioning plate special-shaped hole 1001 and the female shaft fork ball track 1011 simultaneously during the rising process.

[0050] The female shaft fork ball track positioning device with high-precision clearance-free fit involved in the present utility model is installed in the main cavity 1012 of the female shaft fork 1 with clearance-free fit. The rotation of the female shaft fork 1 is directly driven by the rotation of the floating positioning seat, without the need for constant pressing by a pressing component during rotary quenching in the prior art, which is convenient to operate. At the same time, it replaces the large workpiece runout caused by positioning with the outer circle 1013 of the workpiece bowl in the prior art, reduces the range of layer depth fluctuation after heat treatment, the layer depth is 0.1, and can effectively improve the working tensile strength.

[0051] In summary, the present utility model effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0052] The above embodiments are only illustrative of the principles and effects of the present utility model, and are not used to limit the present utility model. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present utility model. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present utility model should still be covered by the claims of the present utility model.

Claims

1. A female shaft fork ball track positioning device with high-precision gapless fit, which is applied to the quenching process of the female shaft fork (1); characterized in that: It includes a floating positioning seat, and the floating positioning seat includes a base (4) and a positioning seat body (5), and the positioning seat body (5) is arranged on the base (4); a plurality of special-shaped bosses (6) are arranged on the outer peripheral surface of the positioning seat body (5), and the plurality of special-shaped bosses (6) are matched with the female shaft fork raceway (1011); A boss through hole (601) is provided in the special-shaped boss (6), and a steel ball (7), a spring (9) and a plug (8) are arranged in the boss through hole (601). The steel ball (7) is arranged at one end of the boss through hole (601), and a part of the steel ball (7) is outside the boss through hole (601), and the remaining part is inside the boss through hole (601); the plug (8) is arranged at the other end of the boss through hole (601), and the spring (9) is arranged between the plug (8) and the steel ball (7).

2. The female shaft fork ball track positioning device with high-precision clearance-free fit according to claim 1, characterized in that: Internal threads are provided on the inner wall of one end of the boss through hole (601) far away from the steel ball (7), external threads are provided on the outer peripheral surface of the plug (8), and the plug (8) is connected in the boss through hole (601) through the internal threads and the external threads to adjust the tightness of the spring (9).

3. The female shaft fork ball track positioning device with high-precision clearance-free fit according to claim 1, characterized in that: The number of boss through holes (601) on one special-shaped boss (6) is two, and the two boss through holes (601) are arranged along the height direction.

4. The female shaft fork ball track positioning device with high-precision clearance-free fit according to claim 1, characterized in that: A plurality of base connection holes (401) and positioning grooves (402) are provided on the base (4), and the base (4) is connected to the jacking cylinder below the base (4) through the base connection holes (401) and the positioning grooves (402).

5. The female shaft fork ball track positioning device with high-precision clearance-free fit according to claim 1, characterized in that: The positioning seat body (5) is cylindrical; the number of the special-shaped bosses (6) is three, and the three special-shaped bosses (6) are arranged on the outer peripheral surface of the positioning seat body (5) at an angle of 120°.

6. The female shaft fork ball track positioning device with high-precision clearance-free fit according to claim 1, characterized in that: The female shaft fork (1) includes a female shaft fork main body (101) and a female shaft fork handle body (102). A main body cavity (1012) is provided in the female shaft fork main body (101), a spline hole (1020) is provided on the female shaft fork handle body (102), and the main body cavity (1012) is communicated with the spline hole (1020); internal splines are provided on the inner wall of the spline hole (1020). A plurality of female shaft fork raceways (1011) are provided on the inner wall of the main body cavity (1012), and a plurality of special-shaped bosses (6) are clamped in the female shaft fork raceways (1011).

7. The female shaft fork ball track positioning device with high-precision clearance-free fit according to claim 1, characterized in that: It further includes a positioning disc (10) and a press head assembly (11). The positioning disc (10) is arranged on the upper side of the floating positioning seat. A positioning disc special-shaped hole (1001) is provided in the positioning disc (10), and the shape of the positioning disc special-shaped hole (1001) matches the shape of the floating positioning seat, and the floating positioning seat can penetrate through the positioning disc special-shaped hole (1001); The press head assembly (11) is arranged on the upper side of the positioning disc (10) in a liftable manner and is used to apply a downward pressure to the female shaft fork (1).

8. The female shaft fork ball track positioning device with high-precision clearance-free fit according to claim 7, characterized in that: A lift drive cylinder is connected to the press head assembly (11), and the lift drive cylinder is used to drive the press head assembly (11) to lift and lower.

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