An eccentric gear shaft hobbing directional tooth alignment jig

Abstract

The utility model discloses a eccentric gear shaft hobbing directional tooth alignment fixture relates to the field of machining. This fixture clever structure design, component simple, easy to manufacture and maintain, compared with the expensive multi -spindle turning center, has greatly reduced the equipment investment cost. Through the accurate cooperation of the upper round hole of eccentric positioning sleeve and the lower eccentric shaft section, and the setting of positioning mark point, the angular position of eccentric gear shaft before hobbing can be accurately controlled, so that the accurate tooth alignment requirement of gear tooth profile and eccentric shaft feature, main shaft feature after hobbing is ensured. This fixture simplifies the machining procedure, avoids the high dependence on complex expensive equipment, and helps to improve the processing efficiency.

Description

Technical Field

[0001] This utility model relates to the field of machining, and in particular to a hobbing and directional gear clamp for an eccentric gear shaft. Background Technology

[0002] RV reducers contain two or three eccentric shafts. Each eccentric shaft consists of two eccentric shaft features, a gear feature, and a main shaft feature. Because the rotation of the eccentric shafts within the same reducer requires perfect synchronization, the centerlines of these features have a tooth alignment requirement for the gear feature. Specifically, the center of one tooth of the gear must be collinear with the centers of the two eccentric features and the main shaft feature, forming a 180-degree angle. Machining such eccentric shafts typically requires a multi-axis turning center. However, this equipment is expensive and its machining efficiency is not very high. Therefore, a simplified multi-stage machining process using conventional equipment is considered to improve efficiency. However, the eccentric tooth alignment requirement during gear hobbing necessitates extremely precise clamping and orientation. Utility Model Content

[0003] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a gear hobbing orientation clamp for eccentric gear shafts. This clamp has a simple structure, can clamp eccentric gear shafts, and is convenient for processing using ordinary gear hobbing equipment.

[0004] To achieve the above objectives, this application discloses an eccentric gear shaft hobbing and orienting clamp for clamping eccentric gear shafts. The eccentric gear shaft includes an upper eccentric shaft segment and a lower eccentric shaft segment disposed on a main shaft. A gear is provided on the main shaft above the upper eccentric shaft segment. The clamp is characterized by comprising a drive center and an eccentric positioning sleeve fixedly connected. The drive center includes a centering drive base, with a spring cavity at the bottom and a circular through hole at the top. The centering center is disposed within the spring cavity and extends through the circular through hole beyond the centering drive base. A positioning shoulder is provided in the middle of the centering center. A compression spring is disposed within the spring cavity and positioned by the shoulder and a plug at the lower opening of the spring cavity. The eccentric positioning sleeve includes a positioning sleeve outer shell, with an upper circular hole and a lower circular hole on the outer shell. The upper circular hole is coaxial with the lower eccentric shaft, and the lower circular hole is coaxial with the main shaft. A positioning mark is provided on the upper circular hole.

[0005] Furthermore, the drive tip and the eccentric positioning sleeve are connected by bolts.

[0006] Furthermore, the outer shell of the eccentric positioning sleeve is provided with several opening slots.

[0007] Furthermore, the upper circular hole is interference-fitted with the lower eccentric shaft, and the lower circular hole is clearance-fitted with the main shaft.

[0008] Furthermore, the centering drive base is provided with a top drive tooth surface.

[0009] Beneficial effects of the technical solution of this utility model

[0010] This fixture features an ingenious design, simple components, and is easy to manufacture and maintain, significantly reducing equipment investment costs compared to expensive multi-axis turning centers. Through the interference fit between the upper circular hole of the eccentric locating sleeve and the lower eccentric shaft section, as well as the setting of locating marks, the angular position of the eccentric gear shaft before hobbing can be precisely controlled, thus ensuring the accurate alignment of the gear tooth profile with the characteristics of the eccentric shaft and the main shaft after hobbing. This fixture simplifies the machining process, avoids heavy reliance on complex and expensive equipment, and helps improve machining efficiency. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the eccentric gear shaft described in this utility model;

[0013] Figure 2 This is a schematic diagram of the structure of an eccentric gear shaft hobbing and orienting clamp according to the present invention;

[0014] Figure 3 This is a schematic diagram showing the state of the eccentric gear shaft after it has been clamped by the hobbing and orienting tooth-aligning fixture of the present invention.

[0015] Figure 4 This is a cross-sectional view of the driving tip of this utility model;

[0016] Figure 5 This is a schematic diagram of the eccentric positioning sleeve of this utility model.

[0017] Wherein: 100-Eccentric gear shaft; 101-Main shaft; 102-Upper eccentric shaft section; 103-Lower eccentric shaft section; 104-Gear. 200-Drive center; 201-Centering drive base; 202-Spring cavity; 203-Circular through hole; 204-Centering center; 205-Positioning shoulder; 206-Compression spring; 207-Plug; 208-Center drive tooth surface. 300-Eccentric positioning sleeve; 301-Positioning sleeve housing; 302-Upper circular hole; 303-Lower circular hole; 304-Positioning mark; 305-Opening slot. 400-Bolt. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figures 1 to 5 This utility model provides a hobbing and orientation fixture for eccentric gear shafts, used for clamping eccentric gear shafts 100. The eccentric gear shaft 100 includes an upper eccentric shaft section 102 and a lower eccentric shaft section 103 mounted on a main shaft 101. A gear 104 is mounted on the main shaft 101 above the upper eccentric shaft section 102. When machining the gear 104, this eccentric gear shaft requires that the center of one of the gear's teeth be collinear with the centers of the two eccentric features—the centers of the upper eccentric shaft section 102 and the lower eccentric shaft section 103—and the center of the main shaft 101, forming a 180-degree angle. This indicates a strict orientation requirement for the teeth.

[0020] The fixture of this utility model is mainly composed of a drive center 200 and an eccentric positioning sleeve 300, which are fixedly connected by bolts 400 to form an integral fixture structure, ensuring the rigidity and stability of the clamping.

[0021] Please see Figure 2 and Figure 4 The drive tip 200 includes a centering drive base 201. The top of the centering drive base 201 is provided with a tip drive tooth surface 208, which is used to connect with the spindle or drive mechanism of the gear hobbing machine to transmit rotational power. The bottom of the centering drive base 201 is provided with a spring cavity 202, and the top of the spring cavity 202 is provided with a circular through hole 203. The centering tip 204 is disposed within the spring cavity 202 and extends out of the centering drive base 201 through the circular through hole 203. A positioning shoulder 205 is provided in the middle of the centering tip 204. A compression spring 206 is disposed within the spring cavity 202, one end of which acts on the positioning shoulder 205, and the other end is positioned and provides preload force through a plug 207 disposed at the lower opening of the spring cavity 202. With this design, the centering tip 204, under the action of the spring 206, can elastically tighten and initially center one end of the eccentric gear shaft 100, which is usually the center hole of the main shaft 101 or the center hole of the upper eccentric shaft section 102.

[0022] Please see Figure 2 , Figure 3 and Figure 5The eccentric positioning sleeve 300 includes a positioning sleeve outer shell 301. The positioning sleeve outer shell 301 is provided with an upper circular hole 302 and a lower circular hole 303. The upper circular hole 302 is used to mate with the lower eccentric shaft segment 103 of the eccentric gear shaft 100, and the axis of the upper circular hole 302 is coaxial with the axis of the lower eccentric shaft segment 103. In this embodiment, preferably, the upper circular hole 302 and the lower eccentric shaft segment 103 are interference-fitted to ensure that the lower eccentric shaft segment 103 is accurately positioned in the eccentric positioning sleeve 300 and will not rotate relative to it. The lower circular hole 303 is used to mate with the main shaft 101 of the eccentric gear shaft 100, and the axis of the lower circular hole 303 is coaxial with the axis of the main shaft 101. In this embodiment, preferably, the lower circular hole 303 and the main shaft 101 are fitted with a clearance, allowing the main shaft 101 to pass through smoothly, while the overall positioning accuracy is ensured by the precise positioning of the upper circular hole 302.

[0023] The key is that a positioning mark 304 is provided on the upper circular hole 302. This positioning mark 304 is crucial for achieving tooth orientation. Before clamping the eccentric gear shaft 100, the eccentric gear shaft 100 needs a reference mark related to the tooth profile required for tooth alignment with the specific tooth profile of the gear 104, or the angular position of this specific tooth profile relative to the eccentric shaft segments 102 and 103 needs to be predetermined in advance through other means. During clamping, the lower eccentric shaft segment 103 of the eccentric gear shaft 100 is pressed into the upper circular hole 302 of the eccentric positioning sleeve 300, while aligning the reference mark on the eccentric gear shaft 100 with the positioning mark 304 on the eccentric positioning sleeve 300. Due to the interference fit between the upper circular hole 302 and the lower eccentric shaft segment 103, once aligned and pressed in, the angular position of the eccentric gear shaft 100 relative to the eccentric positioning sleeve 300 is uniquely determined.

[0024] To facilitate the pressing of the lower eccentric shaft section 103 into the upper circular hole 302 and ensure a tight fit, or to facilitate the subsequent removal of the workpiece, the eccentric positioning sleeve 300 may selectively be provided with a number of opening slots 305 on the positioning sleeve outer shell 301. These opening slots 305 can cause slight elastic deformation of the positioning sleeve outer shell during pressing, or can be used to apply auxiliary force when needed.

[0025] Working Process and Principle: Workpiece Preparation: Mark the angular reference corresponding to the target tooth profile on the eccentric gear shaft 100, for example, on the end face or outer circular surface of the lower eccentric shaft section 103, according to the tooth alignment requirements. Clamping and Positioning: Align the lower eccentric shaft section 103 of the eccentric gear shaft 100 with the upper circular hole 302 of the eccentric positioning sleeve 300, and simultaneously rotate the eccentric gear shaft 100 so that its angular reference is aligned with the positioning mark point 304 of the upper circular hole 302 of the eccentric positioning sleeve 300. Then, press the lower eccentric shaft section 103 into the upper circular hole 302 to achieve a precise fit and fixation. At this time, the spindle 101 passes through the lower circular hole 303. Because the coaxiality of the upper circular hole 302 and the lower circular hole 303 is preset according to the eccentric requirements of the eccentric gear shaft, the axial and radial positions of the eccentric gear shaft 100 and the specific tooth profile direction are precisely defined. The centering tip 204 of the driving tip 200 is pressed against the other end of the eccentric gear shaft 100, such as the center hole of the main shaft 101, under the action of the spring 206.

[0026] The entire fixture, along with the workpiece, is mounted onto a conventional gear hobbing machine. The drive tooth surface 208 of the drive center 200 is connected to the main shaft of the gear hobbing machine to transmit power. Since the eccentric gear shaft 100 has been precisely oriented via the positioning mark point 304, after gear hobbing, the tooth profile of the gear 104 can meet the technical requirement of being collinear with the centers of each eccentric shaft and the main shaft center by 180 degrees.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A gear hobbing and orientation clamp for clamping an eccentric gear shaft (100), the eccentric gear shaft comprising an upper eccentric shaft section (102) and a lower eccentric shaft section (103) disposed on a main shaft (101), wherein a gear (104) is provided on the main shaft above the upper eccentric shaft section, characterized in that: It consists of a fixedly connected drive tip (200) and an eccentric positioning sleeve (300). The drive tip (200) includes a centering drive base (201). The centering drive base (201) has a spring cavity (202) at its bottom and a circular through hole (203) at its top. The centering tip (204) is disposed in the spring cavity (202) and extends through the circular through hole (203) to the outside of the centering drive base (201). The centering tip (204) has a positioning shoulder in its middle. (205) A compression spring (206) is disposed in the spring cavity (202) and positioned by the shoulder (205) and the plug (207) disposed at the lower opening of the spring cavity (202); the eccentric positioning sleeve (300) includes a positioning sleeve shell (301), the positioning sleeve shell is provided with an upper round hole (302) and a lower round hole (303), the upper round hole is coaxially disposed with the lower eccentric shaft, the lower round hole is coaxially disposed with the main shaft (101), and a positioning mark point (304) is provided on the upper round hole.

2. The eccentric gear shaft hobbing and directional gear-aligning fixture according to claim 1, characterized in that: The drive tip (200) and the eccentric positioning sleeve (300) are connected by bolts (400).

3. The eccentric gear shaft hobbing and directional gear-aligning fixture according to claim 1, characterized in that: The eccentric positioning sleeve (300) has several opening slots (305) on its outer shell (301).

4. The eccentric gear shaft hobbing and directional gear-aligning fixture according to claim 1, characterized in that: The upper circular hole (302) is precisely fitted with the lower eccentric shaft (103), and the lower circular hole (303) is clearance fitted with the main shaft (101).

5. The eccentric gear shaft hobbing and orienting clamp according to claim 1, characterized in that: The centering drive base (201) is provided with a top drive tooth surface (208) on its top.

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