Machining tool for internal spline with side teeth

Abstract

The utility model relates to the field of tooth profile machining tools, and discloses a machining tool for an internal spline with side teeth, which comprises a first pull-broach and a second pull-broach, a plurality of layers of first pull-broach teeth are axially arranged on the first pull-broach, each layer of first pull-broach teeth comprises a plurality of first pull-broach teeth uniformly distributed along the circumferential direction, the first pull-broach teeth are involute teeth, and the second pull-broach teeth are involute teeth. One broach tooth is gradually increased to the size of the internal spline along the axial tooth lift; the two-pull broach comprises a broach body, a broach tooth section is arranged on the broach body and comprises a plurality of layers of two broach blades detachably connected in the axial direction of the broach body, the number of layers of the two broach blades is the same as that of the first broach teeth, the number of the two broach blades in each layer is the same as that of the first broach teeth in each layer, two broach teeth are arranged on the two broach blades, and the two broach teeth are involute teeth. The two tooth sides of the two broach teeth are provided with a plurality of symmetrical side broach teeth, and the side broach teeth are involute teeth. The hub bearing internal spline machining device can machine hub bearing internal splines with involute side teeth, and the machining requirement of the internal splines with the side teeth is met.

Description

Technical Field

[0001] The utility model relates to the field of tooth profile machining tools, and particularly relates to a machining tool for an internal spline with side teeth. Background Art

[0002] Automobile wheel hub bearings are key components of the automobile transmission system, and their performance directly affects the running stability of the automobile. Due to the traditional straight-tooth involute spline transmission structure, there is a side clearance between the internal and external spline teeth, and abnormal noises will occur during the forward and reverse driving and acceleration and deceleration of the automobile. On the one hand, the repeated impact of the involute spline teeth affects the fatigue life of the spline teeth, and the abnormal noise also affects the product performance and the comfort of the passengers and drivers; on the other hand, due to the side clearance, there are maximum and minimum side clearances in the spline fit, and only part of the splines are loaded, resulting in a large load on some spline teeth, which further accelerates the failure of the spline teeth.

[0003] The outer ball cage spline of the drive shaft is designed with an increased helix angle to eliminate part of the tooth side clearance (the circumferential fit of the internal and external splines is close to point contact). After disassembly during maintenance or inspection and multiple circumferential loadings, the side contact points of the internal and external spline teeth will wear, resulting in an increase in the side clearance, thus causing looseness and possible abnormal noises during operation; adjusting the cross-rod distance of the drive shaft or hub flange spline: on the premise of ensuring assembly feasibility, the side clearance of the spline teeth is reduced as much as possible, and the effective working tooth groove width (internal spline) and the effective working tooth thickness (external spline) are strictly controlled. This increases the manufacturing difficulty of the product, but there are maximum and minimum side clearances when the same set of internal and external splines are fitted (due to poor coaxiality), and abnormal noises may occur at the maximum side clearance during operation.

[0004] In order to solve the above problems, a spline fit transmission structure with side teeth is proposed. The spline drive shaft and the internal spline of the wheel hub bearing adopted in this design are provided with side teeth on the tooth surface in addition to the conventional spline teeth, which can ensure more pairs of spline teeth to mesh and make the splines evenly loaded. However, in the prior art, there is no tool that can machine the internal spline of the wheel hub bearing with involute side teeth in this design, and the machining requirements of the internal spline with side teeth cannot be met. Content of the Utility Model

[0005] The purpose of the utility model is to provide a machining tool for an internal spline with side teeth, so as to solve the problem that in the prior art, there is no tool that can machine the internal spline of the wheel hub bearing with involute side teeth, and the machining requirements of the internal spline with side teeth cannot be met.

[0006] To achieve the above object, the utility model adopts the following technical solutions: A processing tool for an internal spline with side teeth includes a first broach and a second broach. Along the axial direction of the first broach, multiple layers of first broach teeth are provided. Each layer includes several first broach teeth evenly distributed circumferentially. The first broach teeth are all involute teeth. The axial tooth rise amount of the first broach teeth increases gradually tooth by tooth to the size of the internal spline. The second broach includes a tool body. A tooth segment is provided on the tool body. The tooth segment includes several layers of second broach blades detachably connected along the axial direction of the tool body. The number of layers of the second broach blades is the same as the number of layers of the first broach teeth. The number of each layer of the second broach blades is the same as the number of each layer of the first broach teeth. Second broach teeth are provided on the second broach blades. The second broach teeth are involute teeth. A plurality of symmetric side teeth are provided on both tooth sides of the second broach teeth. The side teeth are involute teeth.

[0007] Preferably, as an improvement, the sizes of several circumferentially distributed first broach teeth in each layer are the same.

[0008] Preferably, as an improvement, the sizes of several circumferentially distributed second broach blades in each layer are the same.

[0009] Preferably, as an improvement, the second broach teeth are arranged along the axial direction of the tool body according to the rise amount of the cutting teeth, finishing teeth, and calibration teeth.

[0010] Preferably, as an improvement, the axial tooth rise amount of the side teeth increases gradually tooth by tooth to the size of the side teeth of the internal spline.

[0011] Preferably, as an improvement, several grooves are provided in the tooth segment. The circumferential number and axial number of the grooves are the same as the number of the first broach teeth and are arranged correspondingly. The second broach blades are detachably connected in the grooves.

[0012] Preferably, as an improvement, the second broach blade includes a bottom plate. The shape and size of the bottom plate are the same as those of the groove. The second broach teeth are integrally formed in the middle of the bottom plate.

[0013] Preferably, as an improvement, connection holes are provided on the bottom plates on the front and rear sides of the second broach teeth. Mounting holes corresponding to the connection holes are provided in the grooves. The second broach blades are fixed in the grooves by fasteners passing through the connection holes and the mounting holes.

[0014] Preferably, as an improvement, the number of side teeth on a single tooth side of the second broach teeth is 5.

[0015] Preferably, as an improvement, a guiding section is further provided on the tool body. The guiding section is adjacent to the tooth segment. The guiding section is provided with guiding teeth whose circumferential number is the same as the circumferential number of the first broach teeth and are arranged correspondingly. The guiding teeth are involute teeth. The height of the guiding teeth is lower than the height of the second broach teeth.

[0016] The principle and advantages of this solution are as follows: In practical applications, a first broach is a general involute spline broach. The tooth rise amount of the first broach teeth increases gradually along the axial direction to the internal spline size. The first broach forms an internal spline by machining a large involute tooth profile on the inner ring of the hub bearing. Then, the internal spline of the inner ring of the hub bearing is re-broached by a second broach. The guiding teeth of the guiding section of the second broach guide the second broach to feed along the large involute tooth profile. The second broach teeth of the second broach feed along the internal spline, pulling out a small involute tooth profile on the large involute tooth profile of the internal spline and forming side teeth on the internal spline. The second broach blades are detachably connected and installed by fasteners, and second broach blades with different numbers of side teeth can be replaced and installed as needed, thereby changing the module of the small involute teeth and being suitable for machining internal splines with side teeth of different module ratios. Through the first broach and the second broach of this solution, an internal spline with involute side teeth can be machined on the inner ring of the hub bearing, meeting the processing requirements of the internal spline with side teeth. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 FIG. is a schematic structural diagram of the first broach in the embodiment of the present invention.

[0018] Figure 2 is Figure 1 an enlarged schematic view of the J position in FIG.

[0019] Figure 3 FIG. is a schematic structural diagram of the second broach in the embodiment of the present invention.

[0020] Figure 4 is Figure 3 an enlarged schematic view of the K position in FIG.

[0021] Figure 5 FIG. is a top view of the second broach blade in the embodiment of the present invention.

[0022] Figure 6 FIG. is a side view of the second broach blade in the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The following is a further detailed description through specific embodiments:

[0024] The reference numerals in the accompanying drawings of the specification include: the first broach 1, the first broach teeth 2, the second broach 3, the guiding teeth 4, the tooth section 5, the groove 7, the second broach blade 8, the bottom plate 81, the second broach teeth 82, the side teeth 83, and the connection hole 84.

[0025] The embodiment is basically as shown in FIGS. Figure 1 and Figure 3 : A processing tool for an internal spline with side teeth includes a first broach 1 and a second broach 3. Twenty-five layers of first broach teeth 2 are axially provided on the first broach 1. Combining Figure 2As shown, each layer includes several first broach teeth 2 evenly distributed circumferentially. The several circumferentially distributed first broach teeth 2 in each layer have the same size. Each first broach tooth 2 is an involute tooth, and the axial tooth rise amount of each first broach tooth 2 increases gradually tooth by tooth to the internal spline size.

[0026] As Figure 3 shown, the second broach 3 includes a tool body. A guiding section and a tooth section 5 are provided on the tool body. The guiding section is adjacent to the tooth section 5. The guiding section is provided with guiding teeth 4 having the same circumferential number as that of the first broach teeth 2 and arranged correspondingly. The guiding teeth 4 are involute teeth. Combining Figure 4 shown, the tooth section 5 is provided with several grooves 7. The circumferential number and the axial number of the grooves 7 are the same as those of the first broach teeth 2 and arranged correspondingly. Second broach blades 8 are detachably connected in the grooves 7. The number of layers of the second broach blades 8 is the same as that of the first broach teeth 2, and the number of the second broach blades 8 in each layer is the same as that of the first broach teeth 2 in each layer. The several circumferentially distributed second broach blades 8 in each layer have the same size. As Figure 5 shown, the second broach blade 8 includes a bottom plate 81. The shape and size of the bottom plate 81 are the same as those of the groove 7. A second broach tooth 82 is integrally formed in the middle of the bottom plate 81. Connecting holes 84 are provided on the bottom plate 81 on the front and rear sides of the second broach tooth 82. Mounting holes corresponding to the connecting holes 84 are provided in the groove 7. The second broach blade 8 is fixed in the groove 7 by fasteners passing through the connecting holes 84 and the mounting holes. The second broach tooth 82 is an involute tooth. The second broach tooth 82 is arranged according to the tooth rise amount of the cutting teeth, finishing teeth, and calibrating teeth along the axial direction of the tool body. Combining Figure 6 shown, the second broach tooth 82 is in a conical shape with a larger bottom and a smaller top. The tooth tip of the second broach tooth 82 inclines towards the side of the guiding teeth 4. Five side broach teeth 83 are respectively provided on the two tooth sides of the second broach tooth 82. The side broach teeth 83 on both sides are symmetrically distributed. The side broach teeth 83 are involute teeth. The axial tooth rise amount of the side broach teeth 83 increases gradually tooth by tooth to the internal spline side tooth size.

[0027] The specific implementation process is as follows: First, a first broach 1 is used to pull out an internal spline with a large involute tooth profile on the inner side of the inner ring of the automotive wheel hub bearing. The first broach 1 is a general involute broach. The axial tooth rise amount of each first broach tooth 2 increases gradually tooth by tooth to the internal spline size. The first broach 1 processes a large involute tooth profile on the inner ring of the wheel hub bearing to form an internal spline. Then, a second broach 3 is used to pull out a small involute tooth profile on the internal spline. The guiding section guides the feed position and direction of the second broach 3 to ensure that the second broach teeth 82 feed along the large involute tooth profile, pull out a small involute tooth profile on the large involute tooth profile of the internal spline, and form side teeth on the internal spline. The second broach blades 8 are detachably connected and installed by fasteners. The second broach blades 8 with different numbers of side broach teeth 83 can be replaced and installed according to needs, so as to change the module of the small involute teeth, and be suitable for processing internal splines with side teeth of different module ratios. Through the first broach 1 and the second broach 3 of this solution, an internal spline with involute side teeth can be processed on the inner ring of the wheel hub bearing to meet the processing requirements of the internal spline with side teeth.

[0028] The above are only the embodiments of the present utility model, and common general technical solutions and / or characteristics and the like well known in the art are not described in detail herein. It should be noted that for those skilled in the art, without departing from the technical solution of the present utility model, several deformations and improvements can still be made, and these should also be regarded as the protection scope of the present utility model, and these will not affect the implementation effect of the present utility model and the practicality of the patent. The protection scope required by this application shall be subject to the content of its claims, and the specific implementation manners and the like recorded in the specification can be used to interpret the content of the claims.

Claims

1. A machining tool with side tooth internal spline, characterized in that: It comprises a single-pulling broach and a double-pulling broach. The single-pulling broach is provided with multiple layers of single-pulling teeth in the axial direction, each layer comprises a number of single-pulling teeth uniformly distributed in the circumferential direction, all of the single-pulling teeth are involute teeth, and the tooth rise of the single-pulling teeth increases tooth by tooth in the axial direction to the internal spline size; the double-pulling broach comprises a tool body, which is provided with a tool tooth section, and the tool tooth section comprises a number of layers of double-pulling blades detachably connected along the axial direction of the tool body, the number of layers of the double-pulling blades is the same as the number of layers of the single-pulling teeth, and the number of double-pulling blades in each layer is the same as the number of single-pulling teeth in each layer, the double-pulling blades are provided with double-pulling teeth, and the double-pulling teeth are involute teeth. A plurality of symmetrical side blade teeth are provided on the two tooth sides of the double-pulling teeth, and the side blade teeth are involute teeth.

2. A machining tool with side tooth internal spline according to claim 1, characterized in that: The sizes of several circumferentially distributed broach teeth in each layer are the same.

3. A machining tool with side tooth internal spline according to claim 2, characterized in that: The sizes of several circumferentially distributed secondary drawing blades in each layer are the same.

4. A machining tool with side-tooth internal splines according to claim 3, characterized in that: The second broaching teeth are arranged along the axial direction of the cutter body according to the lift of the cutting teeth, the fine cutting teeth and the calibration teeth.

5. A machining tool with side-tooth internal splines according to claim 4, characterized in that: The tooth rise of the side cutter teeth along the axial direction of the cutter body increases tooth by tooth to the size of the internal spline side teeth.

6. A machining tool with side-tooth internal splines according to claim 1, characterized in that: The tooth segment is provided with a plurality of grooves, the circumferential number and axial number of the grooves are the same as the number of the first broach teeth and are arranged correspondingly, and the second broaching blades are detachably connected in the grooves.

7. A machining tool with side-tooth internal splines according to claim 6, characterized in that: The two-broach blade comprises a bottom plate, the shape and size of the bottom plate are the same as the groove, and the two-broach teeth are integrally formed in the middle of the bottom plate.

8. A machining tool with side-tooth internal splines according to claim 7, characterized in that: The bottom plates on the front and rear sides of the second broach teeth are both provided with connection holes, and the groove is provided with mounting holes corresponding to the connection holes. The second broach blade is fixed in the groove by fasteners passing through the connection holes and connected to the mounting holes.

9. A machining tool with side-tooth internal splines according to claim 1, characterized in that: The number of upper side teeth on a single tooth side of the second broach tooth is 5.

10. A machining tool with side-tooth internal splines according to claim 1, characterized in that: The cutter body is also provided with a guide section, which is adjacent to the tooth section. The guide section is provided with guide teeth whose circumferential number is the same as that of the first broach teeth and which are arranged correspondingly. The guide teeth are involute teeth, and the height of the guide teeth is lower than that of the second broach teeth.

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