Automobile automatic gearbox duplicate gear

Abstract

The automobile automatic gearbox duplicate gear comprises a large gear and a small gear, the large gear and the small gear are integrally formed, a pressing shaft center hole is formed in the middle of the large gear and the small gear, and air escape holes for providing airflow and lubricating oil channels are symmetrically formed in the inner wall of the pressing shaft center hole; kidney-shaped lightening holes used for lightening the weight of the gears are symmetrically formed around the center hole of the pressing shaft and penetrate through the large gear and the small gear. Connection and assembly between the two gears are omitted through integrated forming, the situation that the coaxiality of the two gears is inconsistent due to assembly is reduced, and the precision and performance of the assembly are improved. The air escape hole promotes the gear to quickly exhaust air in the shaft press-fitting process, provides a channel for lubricating oil, improves the assembly precision of the pressing shaft, reduces mechanical faults caused by heat accumulation generated by friction, improves the mechanical properties of the duplicate gear and the rotating shaft, and prolongs the service life of the duplicate gear and the rotating shaft; and the kidney-shaped lightening holes are formed, so that the weight of the duplicate gear is greatly reduced on the premise that the mechanical strength of the duplicate gear is not affected, and light weight of an automobile is facilitated.

Description

Technical Field

[0001] The utility model relates to a double gear, in particular to a double gear for an automotive automatic transmission. Background Art

[0002] The double gear is a core transmission component of an automotive automatic transmission, including an output gear and an input gear. The two gears are coaxially press-fitted and work at different transmission ratios to achieve the transmission of the transmission. The existing double gears are mostly split structures. It is difficult to ensure the same coaxiality during the assembly connection between the two gears, resulting in poor perpendicularity after the shaft pressing, affecting the stability of gear transmission, causing high noise in the transmission and short service life of the gears. The existing double gears are press-fitted with interference fit between the circular central hole and the shaft. Since the contact surface between the gear and the shaft during press-fitting is large and air is difficult to discharge, the position accuracy is poor and the assembly efficiency is low due to air pressure problems. During the high-speed operation of the transmission, heat may accumulate due to friction on the inner wall of the central hole of the double gear shaft pressing. If the temperature is too high, the service life of the gear shaft will be reduced. For the double gears of the transmission with little difference in tooth diameter, the weights of both gears are relatively large, which is not conducive to the lightweight of the vehicle and results in high power loss of the transmission. The existing double gears of the transmission are symmetrically arranged on the upper and lower end faces, which is not convenient for positioning and assembling with other related components of the transmission, affecting the assembly efficiency. Summary of the Utility Model

[0003] Purpose of the Utility Model: The purpose of the utility model is to provide a double gear for an automotive automatic transmission to improve the coaxiality, stability of the rotation of the double gears of the transmission and the assembly efficiency of the assembly, optimize the cost, and be conducive to the lightweight of the vehicle.

[0004] Technical Solution: The double gear for an automotive automatic transmission described in the utility model includes a large gear and a small gear. The large gear and the small gear are integrally formed, and a shaft pressing central hole is arranged in the middle. Air escape holes for providing air flow and lubricating oil channels are symmetrically arranged on the inner wall of the shaft pressing central hole; weight reduction holes for reducing the weight of the gear are symmetrically arranged around the shaft pressing central hole and penetrate through the large gear and the small gear.

[0005] Furthermore, the large gear and the small gear of the double gear are integrally formed, ensuring the coaxiality between the two gears. The connection and assembly between the two gears are cancelled in the assembly, ensuring the consistency of perpendicularity after shaft pressing, reducing the power loss and noise of gear transmission, reducing the number of parts of the assembly, reducing the assembly difficulty of the assembly, improving the assembly efficiency, optimizing the cost, and at the same time improving the accuracy and performance of the assembly.

[0006] Further, three vent holes are symmetrically arranged. The vent holes penetrate through the inner wall of the central hole of the press shaft, and the vent holes are outward convex arcs with a central angle of 25° to 30°. The arrangement of the vent holes can, on the one hand, avoid the low assembly efficiency and position error caused by air pressure during the press-fitting process of the gear and the shaft due to the difficulty of exhausting air; on the other hand, it can avoid the heat generated by friction on the inner wall of the central hole of the double gear press shaft during the high-speed operation of the gearbox from being exhausted or not being cooled by lubricating oil, resulting in local overheating and mechanical failures. The vent holes can improve the mechanical properties and service life of the double gear and the rotating shaft.

[0007] Further, the weight-reducing holes are waist-shaped and are symmetrically arranged in 4 around the central hole of the press shaft. Compared with circular, elliptical or other shaped weight-reducing holes, the waist-shaped weight-reducing holes reduce the influence of the weight-reducing holes on the mechanical strength of the double gear, while greatly reducing the weight of the double gear, which is beneficial to the lightweight of the vehicle. At the same time, it reduces the influence of external environmental interference on the stability of gear rotation, improves the stability of the double gear during operation, reduces mechanical wear, and improves its service life.

[0008] Further, two assembly marks are arranged on the upper surface of the pinion to facilitate the assembly with other components of the gearbox, improving the positioning and assembly efficiency of the double gear and other parts of the automotive gearbox.

[0009] Beneficial effects: Compared with the prior art, the utility model has the following advantages: 1. Integrally form two double gears with similar tooth diameters, ensuring the coaxiality between the two gears. The connection and assembly between the two gears are cancelled in the assembly of the assembly, ensuring the consistency of perpendicularity after press-fitting, reducing the power loss and noise of gear transmission, reducing the number of parts of the assembly, reducing the assembly difficulty of the assembly, improving the assembly efficiency, optimizing the product cost, and at the same time improving the accuracy and performance of the assembly; 2. Symmetrically arrange 3 axial vent holes in the central hole of the press shaft to avoid assembly errors caused by the difficulty of exhausting air during the press-fitting process of the gear, and further improve the press-fitting coaxiality and assembly efficiency of the double gear; 3. The vent holes also provide a channel for lubricating oil, reducing the heat accumulation generated by friction on the inner wall of the central hole of the double gear press shaft, resulting in local overheating and mechanical failures, and thus improving the mechanical properties and service life of the double gear and the rotating shaft; 4. Symmetrically arrange 4 waist-shaped weight-reducing holes on the double gear body, greatly reducing the weight of the double gear without affecting the mechanical strength of the double gear, which is beneficial to the lightweight of the vehicle; 5. Add assembly marks to facilitate the rapid and accurate positioning and assembly of other components of the gearbox, improving the assembly efficiency. Description of the Drawings

[0010] Figure 1 is a schematic structural diagram of the utility model;

[0011] Figure 2 is the front view of the utility model;

[0012] Figure 3 This is a cross-sectional view of the present utility model Figure 2 in the A-A direction;

[0013] Figure 4 This is a cross-sectional view of the present utility model Figure 2 in the B-B direction. Specific embodiments

[0014] The technical solution of the present utility model will be further described below with reference to the accompanying drawings.

[0015] As Figures 1-4 shown, an automotive automatic transmission double gear includes a large gear 12 and a small gear 11 integrally formed. A press shaft center hole 13 is provided through the centers of the large gear 12 and the small gear 11. Escape holes 131 for providing air flow and lubricating oil channels are symmetrically arranged on the inner wall of the press shaft center hole 13. The escape holes 131 penetrate the inner wall of the press shaft center hole 13, are symmetrically arranged in 3 numbers, and the central angle of the arc is 30° (the escape holes can also be set as an outward convex arc with a central angle of 25 - 30° according to the requirements of double gear press shaft assembly or anti-wear). Around the press shaft center hole 13, and penetrating the large gear 12 and the small gear 11 symmetrically, weight reduction holes 14 for reducing the weight of the gear are provided. The weight reduction holes 14 are waist-shaped and symmetrically arranged in 4 numbers. Two assembly marks 111 for facilitating the assembly with other components of the transmission are provided on the upper surface of the small gear 11.

[0016] During use, according to the assembly marks 111, the integrally formed double gear can be quickly assembled with other components of the automotive transmission. The assembly is fast, the positioning is accurate, and the assembly efficiency is high. The tooth diameters of the large gear 12 and the small gear 11 do not differ much. The integrally formed setting of the two gears ensures the coaxiality between the two gears. The connection and assembly between the two gears are cancelled in the assembly of the assembly unit, ensuring the consistency of the perpendicularity after press shafting, and improving the accuracy and performance of the assembly unit. By symmetrically arranging 3 axial escape holes in the press shaft center hole 13, it can ensure that air is discharged in time during the press fitting process of the gear, further improving the coaxiality and press fitting efficiency of the double gear; at the same time, it is beneficial to the dispersion and filling of lubricating oil, effectively reducing the wear of the inner wall of the press shaft center hole 13 of the double gear, avoiding mechanical failures caused by excessive local temperature, and thus improving the mechanical properties and service life of the double gear and the rotating shaft. On the premise of not affecting the mechanical strength of the double gear, the waist-shaped weight reduction holes 14 greatly reduce the weight of the double gear, which is beneficial to the lightweight of the vehicle.

Claims

1. A double gear of an automobile automatic transmission, comprising a large gear (12) and a small gear (11), characterized in that: The described large gear (12) and small gear (11) are integrally formed, with a central shaft pressing hole (13) provided in the middle. Air escape holes (131) for providing air flow and lubricating oil channels are symmetrically arranged on the inner wall of the central shaft pressing hole (13); weight reduction holes (14) for reducing the weight of the gear are symmetrically arranged around the central shaft pressing hole (13) and penetrate through the large gear (12) and the small gear (11).

2. The dual gear of the automotive automatic transmission according to claim 1, characterized in that Three air escape holes (131) are symmetrically arranged.

3. The dual gear of the automotive automatic transmission according to claim 1 or 2, characterized in that, The air escape holes (131) penetrate through the inner wall of the central shaft pressing hole (13).

4. The duplex gear for an automotive automatic transmission according to claim 1 or 2, characterized in that, The air escape holes (131) are convex arcs with a central angle of 25 - 30°.

5. The double gear of the automotive automatic transmission according to claim 1, characterized in that The weight reduction holes (14) are kidney-shaped.

6. The double gear of the automotive automatic transmission according to claim 5, characterized in that, Four weight reduction holes (14) are symmetrically arranged.

7. The automobile automatic transmission double gear according to claim 1, characterized in that: Assembly marks (111) for facilitating the assembly with other components of the gearbox are provided on the upper surface of the small gear (11).

8. The double gear of the automotive automatic transmission according to claim 7, characterized in that Two assembly marks (111) are provided.

Images