Powder metallurgy helical gear

Abstract

The utility model discloses a powder metallurgy helical gear which comprises a gear seat, inclined gear teeth are evenly arranged on the outer circumferential face of the gear seat, a shaft hole is formed in the center of the gear seat and connected with a transmission shaft, a positioning hole is formed in the inner circumferential face of the shaft hole, and the whole positioning hole is of a cylindrical structure. The utility model provides a powder metallurgy helical gear which solves the problems that an existing helical gear is not stable enough in connection with a transmission shaft, the transmission effect is not stable due to the fact that the gear and the transmission shaft possibly slide relative to each other, the transmission efficiency is not stable, and the service life of the helical gear is prolonged. And even normal operation of the machine is influenced, so that the working efficiency is reduced, and even certain potential safety hazards exist.

Description

Technical Field

[0001] The utility model relates to the technical field of powder metallurgy gears, in particular to powder metallurgy helical gears. Background Art

[0002] A powder metallurgy helical gear is a gear with a certain inclination angle manufactured by powder metallurgy technology. Such gears are widely used in various mechanical transmission systems. In woodworking machinery manufacturing, the power transmission system generally consists of a motor gear and an output gear meshing with each other to transmit the power from the electric motor to the saw blade part connected to the output shaft to achieve the operation. When installing and disassembling the saw blade, it is necessary to fix the lock block part connected to the main shaft by inserting a pin into the keyway to prevent the main shaft from rotating axially, and then lock the saw blade by applying a torque to the connecting thread part.

[0003] In the utility model patent with the patent publication number CN203796893U, a protruding locking block is provided on the front end face of the gear disc body, and the gear disc body and the locking block are of an integral structure and are formed by pressing. Although this method can achieve the locking purpose, there are also problems that the connection between the helical gear and the transmission shaft is not stable enough, relative sliding may occur between the gear and the transmission shaft, resulting in unstable transmission effect, even affecting the normal operation of the machine, thus reducing the work efficiency and even having certain potential safety hazards.

[0004] Therefore, it is necessary to provide a powder metallurgy helical gear to solve the above technical problems. Summary of the Utility Model

[0005] In view of the above situation, in order to overcome the defects of the prior art, the utility model provides a powder metallurgy helical gear to solve the problems existing in the existing gears, such as the connection between the helical gear and the transmission shaft is not stable enough, relative sliding may occur between the gear and the transmission shaft, resulting in unstable transmission effect, even affecting the normal operation of the machine, thus reducing the work efficiency and even having certain potential safety hazards.

[0006] To achieve the above object, the technical solution adopted by the utility model is as follows:

[0007] A powder metallurgy helical gear, comprising: a gear seat;

[0008] The outer peripheral surface of the gear seat is evenly provided with teeth in an inclined state. A shaft hole is opened at the center of the gear seat. The shaft hole is installed and connected to a transmission shaft. A positioning hole is opened on the inner peripheral surface of the shaft hole. The positioning hole is of an overall cylindrical structure. A positioning slot is opened in the direction of the shaft hole of the positioning hole. The positioning slot is of an overall rectangular structure.

[0009] In one embodiment, the positioning holes and the positioning slots are arranged in an annular array, and the number of both is preferably more than six.

[0010] In one embodiment, a rectangular opening is formed in the bottom surface of the gear seat. The rectangular openings are arranged in an annular array and are in an unpenetrated state. The rectangular openings are located between the positioning holes and the teeth.

[0011] In one embodiment, reinforcing strips in the shape of a rear rectangle are formed at intervals within the rectangular opening.

[0012] In one embodiment, the setting angle of the rectangular opening is between adjacent positioning holes.

[0013] The beneficial effects of the present utility model are as follows:

[0014] (1) Through the arrangement of the positioning holes and the positioning slots, after being installed on the transmission shaft, the positioning holes and the positioning slots are inserted into the corresponding structures in the transmission shaft, which helps to improve the working stability of the gear seat.

[0015] (2) Through the setting of the rectangular opening, it helps to reduce the self-weight of the overall gear seat, save raw materials while increasing the gear weight, and helps to reduce the weight of small handheld devices. The setting angle of the rectangular opening is between adjacent positioning holes, aiming to prevent the rectangular opening and the positioning holes from being on the same connection line, which helps to improve the overall strength of the gear. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is the overall structure diagram of the present utility model;

[0017] Figure 2 is the detailed structure diagram of the back side of the overall gear of the present utility model;

[0018] Figure 3 is the detailed bottom view of the gear structure of the present utility model.

[0019] Among them, the corresponding names of the reference numerals are: gear seat 1, teeth 2, shaft hole 3, positioning hole 4, positioning slot 5, rectangular opening 6, reinforcing strip 7. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The present utility model will be further described below in conjunction with the drawings and embodiments. The implementation manners of the present utility model include but are not limited to the following embodiments.

[0021] As Figure 1 - Figure 2 shown, the powder metallurgy helical gear provided by the present utility model includes: gear seat 1, teeth 2, shaft hole 3, positioning hole 4, positioning slot 5;

[0022] As Figure 1As shown, the outer peripheral surface of the gear seat 1 is evenly provided with inclined teeth 2. A shaft hole 3 is provided at the center of the gear seat 1. The shaft hole 3 is installed and connected to a transmission shaft. A positioning hole 4 is provided on the inner peripheral surface of the shaft hole 3. The positioning hole 4 is integrally in a cylindrical structure. A positioning slot 5 is provided in the direction of the shaft hole 3 in the positioning hole 4. The positioning slot 5 is integrally in a rectangular structure. Through the arrangement of the positioning hole 4 and the positioning slot 5, after being installed on the transmission shaft, the positioning hole 4 and the positioning slot 5 are inserted into the corresponding structures in the transmission shaft, which helps to improve the working stability of the gear seat 1.

[0023] Preferably, in one embodiment, as Figure 1 - Figure 2 shown, the positioning holes 4 and the positioning slots 5 are arranged in a circular array. The number of both is preferably more than six. The purpose is to enable the entire inner peripheral surface angle of the shaft hole 3 to receive the force of plugging support.

[0024] Preferably, in one embodiment, as Figure 2 - Figure 3 shown, a rectangular opening 6 is provided on the bottom surface of the gear seat 1. The rectangular openings 6 are arranged in a circular array. The rectangular openings 6 are in a non-through state. The rectangular openings 6 are located between the positioning holes 4 and the teeth 2. Through the setting of the rectangular openings 6, it helps to reduce the self-weight of the overall gear seat 1, save raw materials while increasing the gear weight, and helps to reduce the weight of small handheld use devices.

[0025] Preferably, in one embodiment, as Figure 2 - Figure 3 shown, rectangular strip-shaped reinforcing bars 7 are formed at intervals in the rectangular opening 6. Through the formation of the reinforcing bars 7, it helps to improve the strength of the rectangular opening 6.

[0026] Preferably, in one embodiment, as Figure 3 shown, the setting angle of the rectangular opening 6 is located between adjacent positioning holes 4. The purpose is to prevent the rectangular opening 6 and the positioning hole 4 from being on the same connection line, which helps to improve the strength of the overall gear.

[0027] Working principle of the present utility model:

[0028] During work, through the arrangement of the positioning hole 4 and the positioning slot 5, after being installed on the transmission shaft, the positioning hole 4 and the positioning slot 5 are inserted into the corresponding structures in the transmission shaft, which helps to improve the working stability of the gear seat 1. Through the setting of the rectangular opening 6, it helps to reduce the self-weight of the overall gear seat 1, save raw materials while increasing the gear weight, and helps to reduce the weight of small handheld use devices.

[0029] The above embodiments are only one of the preferred embodiments of the present utility model and should not be used to limit the protection scope of the present utility model. Any modifications or polishing that are made without substantial significance in the main design concept and spirit of the present utility model and whose solved technical problems are still consistent with those of the present utility model should be included within the protection scope of the present utility model.

Claims

1. Powder metallurgy helical gear, characterized in that, Including: Gear seat; The outer peripheral surface of the gear seat is evenly provided with teeth in an inclined state. A shaft hole is opened at the center of the gear seat. The shaft hole is installed and connected with a transmission shaft. A positioning hole is opened on the inner peripheral surface of the shaft hole. The positioning hole is integrally in a cylindrical structure. A positioning slot is opened in the orientation of the positioning hole facing the shaft hole. The positioning slot is integrally in a rectangular structure.

2. The powder metallurgy helical gear according to claim 1, wherein The positioning holes and the positioning slots are arranged in a circular array, and the number of both is more than six.

3. The powder metallurgy helical gear according to claim 1, characterized in that, A rectangular opening is opened on the bottom surface of the gear seat. The rectangular openings are arranged in a circular array. The rectangular openings are in a non-through state. The rectangular openings are located between the positioning holes and the teeth.

4. The powder metallurgy helical gear according to claim 3, characterized in that, Rectangular strip-shaped reinforcing strips are formed at intervals in the rectangular openings.

5. The powder metallurgy helical gear according to claim 3, characterized in that, The setting angle of the rectangular openings is located between adjacent positioning holes.

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