CN220007361U - Pitch circle positioning device suitable for processing inner hole and end face of cylindrical straight gear - Google Patents

Abstract

The utility model belongs to the technical field of machining, and relates to a gear pitch circle positioning device suitable for internal grinding of an inner hole and an end face of a cylindrical straight gear. The pitch circle positioning device suitable for processing the inner hole and the end face of the cylindrical straight gear is provided with a positioning body; the positioning body is a hollow cylinder with a small middle part and large two ends, and the through hole in the center of the hollow cylinder is a stepped through hole with a large middle part and a small middle part; one end of the positioning body is connected with the main shaft of the internal grinding machine, and the other end of the positioning body is positioned in the screwing nut; the pitch circle positioning device is also provided with an elastic jacket; one end of the elastic jacket is positioned in a through hole at one end of the positioning body matched with the screwing nut, and the other end extends out of the through hole to be fixedly connected with the screwing nut; the elastic jacket is matched with the conical surface of the positioning body; the inner wall surface of the elastic jacket is provided with a plurality of positioning bulges uniformly distributed along the circumference; the plurality of positioning protrusions of the elastic jacket are in one-to-one correspondence with tooth grooves of the processed gear and are tightly attached. The utility model has simple structure, high positioning efficiency and convenient operation.

Description

A pitch circle positioning device suitable for inner hole and end face processing of cylindrical spur gears

Technical field

The utility model belongs to the field of mechanical processing technology, and specifically relates to a gear pitch circle positioning device suitable for internal grinding of the inner hole and end face of a cylindrical spur gear.

Background technique

As involute gears become more and more widely used, gears with highly hardened tooth surfaces are usually used to ensure service life. Highly hard tooth surface gears generally undergo heat treatment methods such as carburizing and quenching to obtain higher tooth surface hardness. Gears will inevitably deform after heat treatment. Involute gears mainly engage and drive through the contact of the involute tooth surfaces. Therefore, it is the most direct and effective to use pitch circle positioning to finish the inner hole and end face. In order to improve the efficiency of grinding and clamping and effectively achieve pitch circle positioning, various gear pitch circle positioning devices are also constantly optimized and improved.

It is understood that various related industries are constantly updating and optimizing gear pitch circle positioning devices. The design principles of the pitch circle clamps are roughly divided into three types: (1) Simple pitch circle clamps, which mainly use universal four-jaw chucks and three-jaw chucks. The method of matching the chuck and needle roller; (2) The method of using curved surface self-locking to cooperate with the positioning steel ball; (3) The method of using the elastic sleeve to cooperate with the steel ball or needle roller to achieve effective positioning.

The above positioning method is achieved by placing a round pin (Φd) or a ball in the tooth slot of the gear and then using an elastic jacket. Every positioning operation must first place the round pin into the tooth slot. If you accidentally , easy to fall off. Later, in order to prevent falling off, a cage was designed to fix the round rod, which was inconvenient to operate.

Contents of the invention

In order to solve the above technical problems, the purpose of this utility model is to propose a pitch circle positioning device suitable for the inner hole and end face processing of cylindrical spur gears.

In order to achieve the above purpose, the utility model adopts the following technical solutions:

A pitch circle positioning device suitable for processing the inner hole and end face of cylindrical spur gears. The pitch circle positioning device has a positioning body; the positioning body is a hollow cylinder with a small middle and large ends, and a through hole in the center of the hollow cylinder It is a stepped through hole with large ends and a small middle; one end of the positioning body is connected to the spindle of the internal grinder, and the other end of the positioning body is located in the tightening nut; the pitch circle positioning device also has a function for clamping the processed gear An elastic jacket; one end of the elastic jacket is located in the through hole at one end of the positioning body and the tightening nut, and the other end extends out of the through hole and is firmly connected to the tightening nut; the elastic jacket The tapered surface between the jacket and the positioning body cooperates to form a structure in which the elastic jacket can move relative to the positioning body under the action of tightening the nut; the inner wall surface of the elastic jacket has a plurality of positioning positions evenly distributed along the circumference. Protrusion; the outer wall surface of the positioning protrusion is arc-shaped; the plurality of positioning protrusions of the elastic jacket correspond one to one and closely fit the tooth grooves of the gear being processed, thereby realizing a gear pitch circle positioning device.

A support plate is also provided in the through hole at one end of the positioning body and the tightening nut; one end of the support plate is fitted to the processed gear, and the other end is fixed to the positioning body.

The utility model proposes a pitch circle positioning device suitable for processing the inner hole and end face of cylindrical spur gears. By rotating and tightening the nut, the elastic jacket is elastically deformed. The arc on the elastic jacket is in line with the tooth groove of the processed gear. Close fit to achieve gear pitch circle positioning; the positioning method adopted by this utility model is simple to operate and has high positioning accuracy. Designing different elastic jackets according to the technical parameters of the gear can realize the "positioning" of cylindrical spur gears with different modules and number of teeth. "Pitch circle" positioning.

Description of the drawings

Figure 1 is a schematic structural diagram of the utility model.

Figure 2 is a schematic structural diagram of the elastic jacket in the present utility model.

In the picture: 1. Positioning body, 2. Support plate, 3. Elastic jacket, 4. Tightening nut, 5. Bolt, 6. Gear to be processed, 7. Bolt, 8. Screw, 9. Internal grinder spindle, 10. Positioning bump.

Implementation

The utility model will be described with reference to the drawings and specific embodiments. In this embodiment, the internal cylindrical grinder, positioning body, support plate, and tightening nut are involved, and their structures all adopt existing structures in the prior art. Herein Without further explanation.

As shown in Figure 1, a pitch circle positioning device suitable for processing the inner hole and end face of cylindrical spur gears. The pitch circle positioning device has a positioning body 1; the positioning body 1 is a hollow cylinder with a small middle and large ends. And the through hole in the center of the hollow cylinder is a stepped through hole that is large at both ends and small in the middle; one end of the positioning body 1 is connected to the spindle 9 of the internal grinder, and the other end of the positioning body is located in the tightening nut 4; the pitch circle The positioning device also has an elastic jacket 3 for clamping the processed gear; one end of the elastic jacket 3 is located in the through hole at the end of the positioning body and the tightening nut, and the other end extends out of the through hole. It is firmly connected to the tightening nut; the cone surface between the elastic jacket and the positioning body cooperates to form a structure in which the elastic jacket can move relative to the positioning body under the action of the tightening nut; combined with Figure 2, The inner wall surface of the elastic jacket 3 has a plurality of positioning protrusions 10 evenly distributed along the circumference; the outer wall surface of the positioning protrusions 10 is arc-shaped; the plurality of positioning protrusions of the elastic jacket are not processed. The tooth slots of the gears correspond one to one and fit closely to realize the gear pitch circle positioning device.

A support plate 2 is also provided in the through hole at one end of the positioning body and the tightening nut; one end of the support plate 2 is fitted to the processed gear, and the other end is fixed to the positioning body.

The device is first connected to the spindle of the internal grinder through the screw 8 on the positioning body 1, and the tightening nut 4 is in a loosened state, and then the processed gear 6 is correctly installed into the elastic jacket 3, and one end surface of the processed gear is connected to the support plate 2. Fit the end faces, observe the fit between the arc and the tooth groove, and gradually tighten the nut 4. At this time, the inner cone surface on the positioning body 1 combines with the outer cone surface of the elastic jacket 3, causing the elastic jacket 3 to deform. , the arc of 3 on the elastic jacket closely fits the tooth groove of the processed gear to achieve gear pitch circle positioning.

In the utility model, the elastic jacket 3 and the positioning arc form an integral body, and the structure adopted is simple, the positioning is effective, and the operation is convenient.

Claims (2)

1. Pitch circle positioning device suitable for processing inner hole and end face of cylindrical straight gear, characterized in that: the pitch circle positioning device is provided with a positioning body; the positioning body is a hollow cylinder with a small middle part and large two ends, and the through hole in the center of the hollow cylinder is a stepped through hole with a large middle part and a small middle part; one end of the positioning body is connected with the main shaft of the internal grinding machine, and the other end of the positioning body is positioned in the screwing nut; the pitch circle positioning device is also provided with an elastic jacket for clamping the gear to be processed; one end of the elastic jacket is positioned in a through hole at one end of the positioning body matched with the screwing nut, and the other end of the elastic jacket extends out of the through hole to be fixedly connected with the screwing nut; the elastic jacket is matched with the conical surface of the positioning body to form a structure that the elastic jacket can move relative to the positioning body under the action of screwing the nut; the inner wall surface of the elastic jacket is provided with a plurality of positioning bulges uniformly distributed along the circumference; the outer wall surface of the positioning bulge is arc-shaped; the elastic clamping sleeve is provided with a plurality of positioning protrusions which are in one-to-one correspondence with tooth grooves of the processed gear and are tightly attached to the tooth grooves.

2. A pitch circle positioning device suitable for processing inner holes and end faces of spur gears as claimed in claim 1, wherein: a supporting plate is further arranged in the through hole at one end of the positioning body matched with the screwing nut; one end of the supporting plate is attached to the processed gear, and the other end of the supporting plate is fixed with the positioning body.