Ball cage matched with transmission shaft in gearbox

Abstract

The utility model relates to a ball cage matched with a transmission shaft in a gearbox, which comprises a bell-shaped shell, the bell-shaped shell is provided with a shell main part and a tail shaft, an annular groove is formed on the outer side wall of the shell main part, an assembly ring table is formed in the annular groove, a first inclined surface is formed between the outer side wall and the bottom wall of the assembly ring table, and the first inclined surface is a welding surface. According to the technical scheme, the bell-shaped shell is connected with the gear ring in a welding mode, so that the ball cage and the gear ring form an integral structure, the connection strength is remarkably improved, gaps of matching positions are eliminated, and meanwhile the machining difficulty and cost are effectively reduced.

Description

Technical Field

[0001] This utility model relates to the field of ball cage technology, and more specifically to a ball cage adapted to the drive shaft inside a gearbox. Background Technology

[0002] The ball cage of the driveshaft in an automotive transmission is a key component of the automotive transmission system. It mainly consists of a bell-shaped housing, steel balls, and a cage. The bell-shaped housing has a certain strength and rigidity, which can withstand various forces during vehicle operation. Splines are formed on the outer wall of the bell-shaped housing tail shaft, and a cavity is opened inside. The inner wall of the cavity is opened with ball tracks, in which the steel balls are installed. It is the component that realizes power transmission and angular change compensation. The cage is used to fix the position of the steel balls, so that the steel balls are evenly distributed during the operation of the ball cage, avoiding collisions and interference between the steel balls. The structural design of the cage must ensure that the steel balls can roll freely within the cage, while restricting the axial and radial displacement of the steel balls.

[0003] The CV joint of the drive shaft in an automotive transmission is installed by its bell-shaped housing and gear ring. The conventional method of connection is through the external spline on the outer wall of the bell-shaped housing tail shaft and the spline of the gear ring. For example, Chinese Patent No. CN207278831U discloses a CV joint differential, which includes a differential housing, a left connecting bearing, a CV joint body, a left gear, planetary gears, a right gear, a CV joint end cover, and a right connecting bearing. Each planetary gear has a locating pin. The CV joint body has locating holes corresponding to each locating pin. The CV joint body is connected to the differential housing through the left connecting bearing, and the CV joint end cover is connected to the differential housing through the right connecting bearing. A protective sleeve covering each locating hole is fitted on the CV joint body. This differential also includes a drive gear ring, which is connected to the CV joint body through a spline. The drive gear ring is fitted on both the CV joint body and the CV joint end cover, and the drive gear ring covers the connection gap between the CV joint body and the CV joint end cover.

[0004] In the aforementioned technical solution, the CV joint body and the transmission gear ring are connected by a conventional spline connection. The spline connection mainly relies on the meshing between the spline teeth to transmit torque. Although the spline connection can withstand a large torque, under extreme conditions such as high-intensity off-road driving, rapid acceleration, or sudden braking, the transmission system will be subjected to huge impact forces and torque changes. At this time, the spline teeth will often wear, deform, or even break. Long-term use will greatly affect the efficiency and reliability of power transmission. Moreover, the gaps in the spline connection allow external dust, moisture, and impurities to easily enter. These contaminants will accelerate the wear of the spline teeth and affect the normal operation of the CV joint. At the same time, the spline connection requires high precision in the machining of components. It is necessary to precisely control the size, shape, and positional tolerances of the splines to ensure the fit accuracy between the spline teeth. This undoubtedly leads to an increase in the machining difficulty and cost of the components. Utility Model Content

[0005] To address the above issues, and to overcome the problems of the existing automotive transmission drive shaft using a spline connection between the ball cage and the gear ring, which leads to wear, deformation, and even breakage of the spline teeth under extreme conditions such as high-intensity off-road driving, rapid acceleration, or sudden braking, and the gaps at the spline mating point allowing external dust, moisture, and impurities to easily enter and further accelerate wear, while also increasing the processing difficulty and cost, this invention aims to provide a ball cage for the automotive transmission drive shaft that connects the ball cage and gear ring by welding, thereby forming an integral structure, significantly improving connection strength, eliminating gaps at the mating point, and effectively reducing processing difficulty and cost.

[0006] To achieve the above objectives, the technical solution of this utility model is:

[0007] A ball cage adapted to the internal drive shaft of a gearbox includes a bell-shaped shell having a main body and a tail shaft. An annular groove is formed on the outer side wall of the main body, and an assembly ring platform is formed in the annular groove. A first inclined surface is formed between the outer side wall and the bottom wall of the assembly ring platform, and the first inclined surface is a welding surface.

[0008] Preferably, the outer wall of the assembly ring is flush with the outer wall of the main body of the housing on the other side of the annular groove.

[0009] Preferably, the angle between the first inclined plane and the horizontal plane is 40°.

[0010] Preferably, the bell-shaped shell has a first positioning groove located at the transition between the main body of the shell and the tail shaft. The inner wall of the first positioning groove is successively an arc surface, a straight surface, and a second inclined surface.

[0011] Preferably, the first positioning groove has a length of 2.82 cm, a width of 0.7 cm, a radius of 0.8 cm for the arc surface, a length of 0.13 cm for the straight surface, and an angle of 22°±3° between the second inclined surface and the horizontal plane.

[0012] Preferably, the bell-shaped shell has a second positioning groove, which is located between the assembly ring and the first positioning groove. The inner wall of the second positioning groove has a third inclined surface, which communicates with the first positioning groove through the third inclined surface.

[0013] Preferably, the angle between the third inclined plane and the vertical plane is 45°.

[0014] Preferably, the main body of the shell has a cavity inside, and six ball tracks are arranged sequentially on the inner wall of the cavity.

[0015] Compared with the prior art, the advantages of this utility model are:

[0016] This utility model eliminates the spline design on the outer wall of the tail shaft. It is embedded in the gear ring through a bell-shaped shell. At this time, the outer wall of the mounting ring on the main part of the shell will abut against the inner wall of the gear ring. At the same time, the ball cage and the inner wall of the gear ring are connected as one piece by welding, which can withstand greater torque and axial force. Especially under extreme conditions such as high-intensity off-road driving, rapid acceleration or sudden braking, it avoids relative sliding and wear between the ball cage and the gear ring, and greatly reduces the possibility of deformation or even breakage at the mating point, thus ensuring the stability and reliability of power transmission. In addition, it also eliminates the gap between the inner wall of the gear ring and the ball cage, thus blocking the entry of external dust, moisture and impurities, and avoiding accelerated wear. At the same time, the spline fit has lower requirements for the machining precision of the parts, thus controlling the machining difficulty and cost. Attached Figure Description

[0017] Figure 1 This is a cross-sectional structural diagram of the ball cage of this utility model;

[0018] Figure 2 This utility model Figure 1 A magnified structural diagram of part A;

[0019] Figure 3 This utility model Figure 1 A schematic diagram of the enlarged structure of part B;

[0020] Figure 4 This utility model Figure 1 A magnified structural diagram of section C;

[0021] Figure 5 This is a top view of the structure of the ball cage of this utility model.

[0022] As shown in the figure:

[0023] 1. Bell-shaped shell; 1a. Main part of the shell; 1b. Tail shaft; 101. Annular groove; 102. Assembly ring platform; 102a. First inclined surface; 103. First positioning groove; 103a. Arc surface; 103b. Flat surface; 103c. Second inclined surface; 104. Second positioning groove; 104a. Third inclined surface; 105. Cavity; 105a. Ball track. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0025] In the description of this utility model, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the purpose of simplifying the description and do not indicate or imply that the orientation is a specific orientation or specific orientation structure and operation. Therefore, they should not be construed as limiting this utility model.

[0026] like Figure 1 and Figure 2 As shown, this utility model relates to a ball cage adapted to the drive shaft inside a gearbox. It includes a bell-shaped shell 1, which consists of a main shell 1a and a tail shaft 1b. The tail shaft 1b is located at the bottom of the main shell 1a. An annular groove 101 is formed on the outer wall of the main shell 1a, specifically on the side near the tail shaft 1b, which makes the entire bell-shaped shell 1 bell-shaped. An assembly ring platform 102 is formed in the annular groove 101, which is in contact with the bottom of the main shell 1a. A first inclined surface 102a is formed between the outer wall and the bottom wall of the assembly ring platform 102, which serves as the welding surface. This utility model eliminates the spline design on the outer wall of the tail shaft 1b. It is embedded into the gear ring through the bell-shaped shell 1. At this time, the outer wall of the assembly ring platform 102 on the main shell 1a will abut against the inner wall of the gear ring, while the first inclined surface 102a is exposed to the external view. During the welding process, The first inclined surface 102a and the inner wall of the gear ring are heated to their melting point, causing them to melt and mix. After the temperature drops and solidifies, the welding is completed. A molten pool is also formed between the first inclined surface 102a and the inner wall of the gear ring, which can be filled with metal. After the molten pool cools and solidifies, the gear ring and the bell-shaped shell 1 are connected as one unit. The welding method ensures a tight fit between the ball cage and the gear ring, enabling it to withstand greater torque and axial force. Especially under extreme conditions such as high-intensity off-road driving, rapid acceleration, or sudden braking, it avoids relative sliding and wear between the ball cage and the gear ring, and greatly reduces the possibility of deformation or even breakage at the mating point, thereby ensuring the stability and reliability of power transmission. In addition, it also eliminates the gap between the inner wall of the gear ring and the ball cage, thus preventing the entry of external dust, moisture, and impurities, and avoiding accelerated wear. At the same time, the spline fit has lower requirements for the machining precision of the parts, thereby controlling the machining difficulty and cost.

[0027] like Figure 1 As shown, the outer wall of the assembly ring platform 102 is flush with the outer wall of the main shell 1a on the other side of the annular groove 101. When the ball cage of this utility model is embedded in the toothed ring through the bell-shaped shell 1, it can increase the number of contact surfaces and the contact surface area with the inner wall of the toothed ring, thereby avoiding the ball cage from swinging during the welding process and improving the stability of the connection after welding and fixing.

[0028] like Figure 2 As shown, the angle between the first inclined plane 102a and the horizontal plane is 40°. In this way, when the first inclined plane 102a melts during the welding process, it can increase the amount of molten metal and also increase the depth of the molten pool formed between it and the inner wall of the gear ring, thereby increasing the area of ​​the welding surface and enabling a tighter connection between the ball cage and the gear ring.

[0029] like Figure 1 and Figure 3 As shown, a first positioning groove 103 is provided on the bell-shaped shell 1. The first positioning groove 103 is located at the transition between the main part 1a of the shell and the tail shaft 1b. The inner wall of the first positioning groove 103 is successively an arc surface 103a, a straight surface 103b, and a second inclined surface 103c. After the ball cage of this utility model is welded and fixed to the gear ring, a positioning component matching the shape of the first positioning groove 103 is embedded inside. The axial movement of the ball cage is restricted by the plug-in engagement, thereby achieving axial positioning, keeping the position of the ball cage stable, and keeping the position of the gear ring welded to the ball cage stable. This ensures stable and reliable power transmission. At the same time, the arc surface 103a can effectively disperse stress in the engagement state and transmit it through the straight surface 103b and the second inclined surface 103c, reducing the wear and deformation of the first positioning groove 103 and improving the service life of the entire ball cage.

[0030] like Figure 3 As shown, the length of the first positioning groove 103 is 2.82cm, the width is 0.7cm, the radius of the arc surface 103a is 0.8cm, the length of the straight surface 103b is 0.13cm, and the angle between the second inclined surface 103c and the horizontal plane is 22°±3°.

[0031] like Figure 1 and Figure 4 As shown, in order to further improve the stability of the ball cage and gear ring, a second positioning groove 104 is also provided on the bell-shaped shell 1. The second positioning groove 104 is located between the assembly ring platform 102 and the first positioning groove 103. That is to say, the second positioning groove 104 is located at the bottom of the main part 1a of the shell. The inner wall of the second positioning groove 104 has a third inclined surface 104a. When the ball cage and gear ring of this utility model are welded together, a positioning component that matches the shape of the second positioning groove 104 is embedded inside to support the ball cage. In this way, the axial movement of the ball cage can be further restricted by the plug-in fit, and axial positioning can be achieved.

[0032] like Figure 4 As shown, the angle between the third inclined plane 104a and the vertical plane is 45°.

[0033] like Figure 1 and Figure 5As shown, a cavity 105 is formed inside the main part 1a of the shell. Ball channels 105a are arranged sequentially on the inner wall of the cavity 105. There are 6 ball channels 105a. It can be understood that there are also 6 steel balls. This increases the contact points generated by the steel balls, disperses the contact pressure, reduces the wear of the contact points generated by individual steel balls, thereby improving the overall wear resistance and extending the service life of the entire outer ball cage.

[0034] Combination Figures 1 to 5 In this invention, the ball cage is embedded into the gear ring of the gearbox via a bell-shaped shell 1. The outer wall of the mounting ring 102 on one side of the annular groove 101 of the main part 1a of the bell-shaped shell 1 and the outer wall on the other side abut against the inner wall of the gear ring, and then welding can be performed. Specifically, the first inclined surface 102a and the inner wall of the gear ring are heated to their melting point, so that the two positions melt and mix. After the temperature drops and solidifies, the welding is completed. A molten pool is also formed between the first inclined surface 102a and the inner wall of the gear ring, so that metal can be filled into it. After the molten pool cools and solidifies, the gear ring and the bell-shaped shell 1 are connected as one piece. The welding method makes the ball cage and the gear ring tightly connected. Finally, a positioning component matching the shape of the first positioning groove 103 is embedded inside, and a positioning component matching the shape of the second positioning groove 104 is also embedded inside. The ball cage is axially positioned by means of plug-in fit, so that the position of the ball cage is kept stable, and the position of the gear ring welded to the ball cage is kept stable, thereby making the power transmission stable and reliable.

[0035] The embodiments and descriptions above are merely illustrative of the principles and preferred embodiments of this utility model. Various changes and modifications may be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of this utility model as claimed.

Claims

1. A ball joint cage adapted to the drive shaft inside a gearbox, characterized in that, It includes a bell-shaped shell (1) having a main shell portion (1a) and a tail shaft (1b). An annular groove (101) is formed on the outer side wall of the main shell portion (1a). An assembly ring platform (102) is formed in the annular groove (101). A first inclined surface (102a) is formed between the outer side wall and the bottom wall of the assembly ring platform (102), and the first inclined surface (102a) is a welding surface.

2. The ball joint cage adapted to the drive shaft inside a gearbox according to claim 1, characterized in that, The outer wall of the assembly ring platform (102) is flush with the outer wall of the main body of the housing (1a) on the other side of the annular groove (101).

3. The ball joint cage adapted to the internal drive shaft of a gearbox according to claim 2, characterized in that, The angle between the first inclined plane (102a) and the horizontal plane is 40°.

4. A ball joint for adapting to the drive shaft inside a gearbox according to any one of claims 1 to 3, characterized in that, The bell-shaped shell (1) is provided with a first positioning groove (103), which is located at the transition between the main part (1a) of the shell and the tail shaft (1b). The inner wall of the first positioning groove (103) is an arc surface (103a), a straight surface (103b), and a second inclined surface (103c) in sequence.

5. A ball joint for adapting to the drive shaft inside a gearbox according to claim 4, characterized in that, The first positioning groove (103) has a length of 2.82cm and a width of 0.7cm. The radius of the arc surface (103a) is 0.8cm. The length of the straight surface (103b) is 0.13cm. The angle between the second inclined surface (103c) and the horizontal surface is 22°±3°.

6. A ball joint for adapting to the drive shaft inside a gearbox according to claim 5, characterized in that, The bell-shaped shell (1) is provided with a second positioning groove (104), which is located between the assembly ring platform (102) and the first positioning groove (103). The inner wall of the second positioning groove (104) has a third inclined surface (104a), which is connected to the first positioning groove (103) through the third inclined surface (104a).

7. A ball joint for adapting to the drive shaft inside a gearbox according to claim 6, characterized in that, The angle between the third inclined plane (104a) and the vertical plane is 45°.

8. A ball joint for adapting to the drive shaft inside a gearbox according to any one of claims 1, 2, 3, 5, 6 or 7, characterized in that, The main part (1a) of the shell has a cavity (105) inside, and six ball tracks (105a) are arranged sequentially on the inner wall of the cavity (105).

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