Connecting structure of differential shaft and differential rod

Abstract

The utility model provides a connecting structure of a differential shaft and a differential rod, and belongs to the technical field of sewing equipment. The connecting structure comprises a differential shaft, a differential rod and a screw, an inserting hole is formed in the differential rod, one end of the differential shaft is provided with an inserting part, the inserting part is inserted into the inserting hole, and the screw is in threaded connection with the inserting part and fixes the differential rod and the differential shaft. A limiting groove does not need to be formed in the differential shaft of the connecting structure, torque transmission between the differential rod and the differential shaft is achieved through the inserting part and the inserting hole, the inserting part meeting the strength requirement can be machined through turning and milling of a round steel bar, a forging piece with the complex technology does not need to be adopted as a blank for machining, and the manufacturing cost is well reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewing equipment and relates to a connection structure of a differential shaft and a differential rod. Background Art

[0002] In sewing equipment, a differential adjustment mechanism is often required when feeding fabric. The differential adjustment mechanism includes a differential rod, a differential shaft, and screws that fix the two. Its specific structure can refer to a sewing machine provided by application number 201710412244.4.

[0003] In the prior art, a limit groove 11 is provided on the differential shaft 1, and the differential rod 2 is installed in the limit groove 11 (for example, the differential adjustment mechanism mentioned in application number 201710412244.4). The shortcomings of this differential shaft are: the differential shaft needs to be specially molded and cast; the limit groove has high dimensional accuracy requirements, and there is a tool withdrawal groove at the bottom of the limit groove, and there are many processing steps; in order to ensure sufficient connection strength, the limit groove also needs to be heat treated; during subsequent grinding, due to the presence of the limit groove, the cylindrical part of the differential shaft can only be ground one by one, which is inconvenient to process and has a relatively high manufacturing cost. Summary of the Invention

[0004] In view of the above problems existing in the prior art, the present invention provides a connection structure between a differential shaft and a differential rod. The technical problem to be solved by the present invention is: how to reduce the manufacturing cost by changing the connection structure between the differential shaft and the differential rod.

[0005] The purpose of this utility model can be achieved through the following technical solutions:

[0006] A connection structure between a differential shaft and a differential rod, the connection structure comprising a differential shaft, a differential rod and a screw, characterized in that a plug hole is provided on the differential rod, one end of the differential shaft has a plug portion, the plug portion is plugged into the plug hole, and the screw is threadedly connected to the plug portion and fixes the differential rod and the differential shaft.

[0007] In this connection structure, the screw thread is connected to the plug-in part and fixes the differential rod and the differential shaft. The plug-in part of the differential shaft is plugged into the plug-in hole of the differential rod, and the torque between the differential rod and the differential shaft is transmitted through the plug-in part and the plug-in hole.

[0008] In the existing technology, in order to open a limit groove on the differential shaft, a boss needs to be set on the end of the differential shaft, and the limit groove is opened on the boss. In order to better transmit torque, the two groove walls of the limit groove (the groove walls are in contact with the differential rod respectively) must have sufficient strength and hardness. Therefore, the differential shaft is made by forging, and heat treatment is required during the processing; in order to make the limit groove and the differential rod fit closely, it is necessary to ensure that the limit groove has high precision, and the groove bottom of the limit groove needs to increase the tool withdrawal groove, so that the processing precision of the limit groove is high and the processing difficulty is greater; the cylindrical part of the differential shaft needs to be processed by external cylindrical grinding. Due to the existence of the boss, it can only be ground one by one during grinding, which is less efficient.

[0009] In this connection structure, the differential shaft is made of ordinary steel and can be processed by turning and milling. The differential shaft does not need to be provided with a boss. Its shape is regular and the processing difficulty is low. During grinding, multiple parts can be ground at the same time, which greatly improves the processing efficiency.

[0010] In addition, there is no need to open a limit groove on the differential shaft. The torque between the differential rod and the differential shaft can be transmitted through the plug-in part and the plug-in hole. The plug-in part milled out of ordinary steel can meet the strength requirements, and no special forging and heat treatment are required, which greatly reduces manufacturing costs.

[0011] In the above-mentioned connection structure between a differential shaft and a differential rod, the shape of the plug-in portion is adapted to the shape of the plug-in hole, and the outer surface of the plug-in portion is in contact with the inner wall of the plug-in hole.

[0012] When the plug-in portion is inserted into the plug-in hole, the outer surface of the plug-in portion abuts against the inner wall of the plug-in hole. This structure can greatly improve the stability of the connection between the differential bar and the differential shaft and better transmit torque.

[0013] In the above-mentioned connection structure between a differential shaft and a differential rod, the plug-in hole is a special-shaped hole, and the plug-in portion has two oppositely arranged planes, which are respectively in contact with the inner walls of the special-shaped hole.

[0014] The special-shaped hole is completed by stamping and can meet the requirements of fitting accuracy. The special-shaped hole is long and has two oppositely arranged planes on its inner wall. The ends of the two planes are connected by an arc surface. When the plug-in part is plugged into the plug-in hole, the planes on the plug-in hole are respectively abutted against the corresponding planes on the inner wall of the special-shaped hole. This structure makes the plug-in part fully contact with the plug-in hole, greatly improves the stability of the connection between the differential bar and the differential shaft, and better transmits torque.

[0015] In the above-mentioned connection structure between a differential shaft and a differential rod, one end of the differential shaft abuts against one side of the differential rod, and the screw includes a main body portion having a screw portion thereon. The main body portion abuts against the other side of the differential rod, and the screw portion is threadedly connected to the plug-in portion.

[0016] The differential bar is located between the differential shaft and the screw, and the side surfaces of the differential bar respectively abut against one end portion of the differential shaft and the main body of the screw. This structure can greatly improve the stability of the connection between the differential shaft and the differential bar.

[0017] In the above-mentioned connection structure between the differential shaft and the differential rod, a gasket 1 is sleeved on the screw portion, one side of the gasket 1 abuts against one end of the main body portion, and the other side of the gasket 1 abuts against the differential rod.

[0018] The washer is located between the main body of the screw and the differential bar. The provision of the washer can increase the force-bearing surface between the screw and the differential bar, making the differential bar and the differential shaft more tightly connected and improving the stability of the connection between the two.

[0019] In the above-mentioned connection structure between the differential shaft and the differential rod, a second gasket is sleeved on the plug-in portion, one side surface of the second gasket abuts against one end portion of the differential shaft, and the other side surface of the second gasket abuts against the differential rod.

[0020] The second gasket is located between the differential shaft and the differential bar. The second gasket can increase the force-bearing surface between the differential bar and the differential bar, making the differential bar and the differential shaft more tightly connected and improving the stability of the connection between the two.

[0021] When the first gasket and the second gasket are provided at the same time, the connection between the differential bar and the differential shaft is more stable.

[0022] In the above-mentioned connection structure between the differential shaft and the differential rod, the screws are English screws.

[0023] Compared with the prior art, the advantages of the present invention are as follows:

[0024] 1. There is no need to provide a limit groove on the differential shaft of this connection structure. The torque transmission between the differential rod and the differential shaft is achieved through the plug-in part and the plug-in hole. The plug-in part that meets the strength requirements can be processed by turning and milling a round steel bar. There is no need to use complex forging parts as blanks for processing, which reduces the processing steps, reduces the manufacturing difficulty, and greatly reduces the manufacturing cost.

[0025] 2. The differential shaft of this connection structure does not need to be provided with a boss. Its shape is regular and the processing difficulty is low. During grinding, multiple parts can be ground at the same time, which greatly improves the processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a differential shaft and a differential rod in the prior art;

[0027] Figure 2 It is a structural diagram of this connection structure;

[0028] Figure 3 yes Figure 2 A magnified view of part A in FIG;

[0029] Figure 4 It is a structural diagram of the differential bar;

[0030] Figure 5 It is a structural diagram of the differential shaft;

[0031] Figure 6 It is a schematic diagram of the structure of a screw.

[0032] In the figure: 1 differential shaft, 2 differential rod, 3 screw, 4 plug-in hole, 5 plug-in portion, 6 plane, 7 main body, 8 screw portion, 9 gasket 1, 10 gasket 2, 11 limit groove, 12 boss. DETAILED DESCRIPTION

[0033] The following are specific embodiments of the present invention, and the technical solutions of the present invention are further described in conjunction with the accompanying drawings, but the present invention is not limited to these embodiments.

[0034] like Figure 2 、 4 As shown in Figure 5, the connection structure includes a differential shaft 1, a differential rod 2 and a screw 3. The differential rod 2 is provided with a plug-in hole 4. One end of the differential shaft 1 has a plug-in portion 5, which is plugged into the plug-in hole 4. The screw 3 is threadedly connected to the plug-in portion 5 and fixes the differential rod 2 to the differential shaft 1.

[0035] In this connection structure, the screw 3 is threadedly connected to the plug-in portion 5 and fixes the differential bar 2 and the differential shaft 1. The plug-in portion 5 of the differential shaft 1 is plugged into the plug-in hole 4 of the differential bar 2. The torque is transmitted between the differential bar 2 and the differential shaft 1 through the plug-in portion 5 and the plug-in hole 4.

[0036] like Figure 1As shown, in the prior art, in order to open the limit groove 11 on the differential shaft 1, a boss 12 needs to be set on the end of the differential shaft 1, and the limit groove 11 is opened on the boss 12, and in order to better transmit torque, the two groove walls of the limit groove 11 (the groove walls are respectively in contact with the differential rod 2) must have sufficient strength and hardness. Therefore, the differential shaft 1 is formed by forging, and heat treatment is required during the processing; in order to make the limit groove 11 fit closely with the differential rod 2, it is necessary to ensure that the limit groove 11 has high precision, and the groove bottom of the limit groove 11 also needs to add a tool withdrawal groove, so that the processing precision of the limit groove 11 is high and the processing difficulty is greater; the cylindrical part of the differential shaft 1 needs to be processed by external cylindrical grinding. Due to the existence of the boss 12, it can only be ground one by one during grinding, which is less efficient.

[0037] In this connection structure, the differential shaft 1 is made of ordinary steel and can be processed by turning and milling. The differential shaft 1 does not need to be provided with a boss 12. Its shape is regular and the processing difficulty is low. During grinding, multiple parts can be ground at the same time, which greatly improves the processing efficiency.

[0038] In addition, there is no need to provide a limiting groove 11 on the differential shaft 1. The torque transmission between the differential rod 2 and the differential shaft 1 is achieved through the plug-in portion 5 and the plug-in hole 4. The plug-in portion 5 milled out of ordinary steel can meet the strength requirements, and no special forging and heat treatment are required, which greatly reduces the manufacturing cost.

[0039] Preferably, the shape of the plug-in portion 5 is adapted to the shape of the plug-in hole 4 , and the outer surface of the plug-in portion 5 is in contact with the inner wall of the plug-in hole 4 .

[0040] When the plug-in portion 5 is inserted into the plug-in hole 4, the outer surface of the plug-in portion 5 abuts against the inner wall of the plug-in hole 4. This structure can greatly improve the stability of the connection between the differential bar 2 and the differential shaft 1 and better transmit torque.

[0041] like Figure 4 and 5 As shown, in this embodiment, the plug hole 4 is a special-shaped hole, and the plug portion 5 has two oppositely arranged flat surfaces 6, which are respectively in contact with the inner walls of the special-shaped hole.

[0042] The special-shaped hole is completed by stamping and can meet the requirements of fitting accuracy. The special-shaped hole is long and has two oppositely arranged planes 6 on its inner wall. The ends of the two planes 6 are connected by an arc surface. When the plug-in part 5 is plugged into the plug-in hole 4, the planes 6 on the plug-in hole 4 are respectively abutted against the corresponding planes 6 on the inner wall of the special-shaped hole. This structure makes the plug-in part 5 fully contact with the plug-in hole 4, greatly improves the stability of the connection between the differential bar 2 and the differential shaft 1, and better transmits torque.

[0043] like Figure 6As shown, the screw 3 includes a main body 7 with a screw portion 8 on the main body 7. As an embodiment, the main body 7 abuts against the other side of the differential bar 2, the screw portion 8 is threadedly connected to the plug-in portion 5, and one end of the differential shaft 1 abuts against one side of the differential bar 2.

[0044] The differential bar 2 is located between the differential shaft 1 and the screw 3. The side surfaces of the differential bar 2 abut against one end of the differential shaft 1 and the main body 7 of the screw 3, respectively. This structure can effectively improve the stability of the connection between the differential shaft 1 and the differential bar 2. As an embodiment, the screw 3 is an imperial screw 3.

[0045] like Figure 2 、 3 As shown in FIG6 , in this embodiment, a gasket 9 is sleeved on the screw portion 8 , one side of the gasket 9 abuts against one end of the main body portion 7 , and the other side of the gasket 9 abuts against the differential bar 2 .

[0046] The washer 9 is located between the main body 7 of the screw 3 and the differential bar 2. The provision of the washer 9 can increase the force-bearing surface between the screw 3 and the differential bar 2, making the differential bar 2 and the differential shaft 1 more tightly connected and improving the stability of the connection between the two.

[0047] like Figure 2 As shown, in this embodiment, a second gasket 10 is sleeved on the plug-in portion 5 , one side surface of the second gasket 10 abuts against one end of the differential shaft 1 , and the other side surface of the second gasket 10 abuts against the differential bar 2 .

[0048] The second gasket 10 is located between the differential shaft 1 and the differential bar 2. The second gasket 10 can increase the force-bearing surface between the differential bar 2 and the differential bar 2, so that the differential bar 2 and the differential shaft 1 are more tightly connected and the stability of the connection between the two is improved.

[0049] When the first gasket 9 and the second gasket 10 are provided at the same time, the connection between the differential bar 2 and the differential shaft 1 is more stable.

[0050] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. A connection structure between a differential shaft and a differential rod, the connection structure comprising a differential shaft (1), a differential rod (2) and a screw (3), characterized in that: The differential rod (2) is provided with a plug hole (4), one end of the differential shaft (1) has a plug portion (5), the plug portion (5) is plugged into the plug hole (4), and the screw (3) is threadedly connected to the plug portion (5) to fix the differential rod (2) and the differential shaft (1).

2. The connection structure between a differential shaft and a differential rod according to claim 1, characterized in that: The shape of the plug-in portion (5) is adapted to the shape of the plug-in hole (4), and the outer surface of the plug-in portion (5) is in contact with the inner wall of the plug-in hole (4).

3. The connection structure between a differential shaft and a differential rod according to claim 1 or 2, characterized in that: The plug-in hole (4) is a special-shaped hole, and the plug-in portion (5) has two oppositely arranged planes (6), and the planes (6) are respectively in contact with the inner walls of the special-shaped hole.

4. The connection structure between a differential shaft and a differential rod according to claim 1 or 2, characterized in that: One end of the differential shaft (1) abuts against one side of the differential rod (2); the screw (3) includes a main body (7); the main body (7) has a screw portion (8); the main body (7) abuts against the other side of the differential rod (2); and the screw portion (8) is threadedly connected to the plug portion (5).

5. The connection structure between a differential shaft and a differential rod according to claim 4, characterized in that: A gasket (9) is sleeved on the screw portion (8), one side of the gasket (9) abuts against one end of the main body (7), and the other side of the gasket (9) abuts against the differential rod (2).

6. The connection structure between a differential shaft and a differential rod according to claim 5, characterized in that: A second gasket (10) is sleeved on the plug-in portion (5), one side surface of the second gasket (10) abuts against one end of the differential shaft (1), and the other side surface of the second gasket (10) abuts against the differential rod (2).

7. The connection structure between a differential shaft and a differential rod according to claim 1 or 2, characterized in that: The screws (3) are British screws.

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