Engine metal pipe and ball head structure thereof

Abstract

The utility model provides an engine metal tube and a ball head structure thereof, comprising a ball head shell, wherein the ball head shell comprises a welding portion and a connecting portion, wherein the welding portion is provided with a welding hole, wherein the connecting portion is provided with a connecting hole, wherein straight pattern teeth are provided in the welding hole, wherein the straight pattern teeth form an inner tooth hole, wherein the straight pattern teeth and the ball head shell are integrally formed by cold heading, wherein the straight pattern teeth are provided, and when the tube is inserted into the welding hole, a certain gap is formed between the welding hole wall and the tube, and when brazing is performed, the brazing material is filled into the gap, thereby increasing the welding strength.

Description

Technical Field

[0001] The utility model relates to automobile engine accessories, in particular to an engine metal pipe and a ball head structure thereof. Background Art

[0002] Ball head parts are used in metal pipelines of automotive products. After the ball head is welded to the metal pipe, it is installed on the automobile engine. The ball head parts play a connecting and sealing role.

[0003] There are two main structures for connecting ball heads and metal pipes on the market: one is that the ball head hole diameter is larger than the pipe diameter, and a clearance fit structure is adopted. This structure requires welding to position the ball head and the pipe. During the welding process, problems such as damage to the base material of the parts, low welding efficiency, and cold welding may occur, which will have an adverse effect on the performance of the parts;

[0004] The other is a structure in which the ball head aperture is smaller than the tube diameter and a full interference fit is adopted. This structure requires the tube to be pressed into the ball head for positioning. There is no gap between the ball head part and the tube. The fitting tolerance requirements of the parts and the accuracy requirements of the parts themselves are high, the machining cost is high, and the brazing material cannot effectively penetrate the weld during the brazing process, resulting in insufficient brazing strength and parts leakage. Utility Model Content

[0005] In view of this, the first object of the present invention is to provide a ball head structure, which has the advantage of higher welding strength.

[0006] In order to solve the above technical problems, the technical solution of the utility model is: a ball head structure, including a ball head shell, the ball head shell including a welding part and a connecting part, the welding part is provided with a welding hole, the connecting part is provided with a connecting hole, the welding hole is provided with straight teeth, the straight teeth form an inner tooth hole, and the straight teeth and the ball head shell are integrally formed by cold heading.

[0007] Through the above technical means, by opening straight-grained teeth, when the pipe is inserted into the welding hole, a certain gap is created between the welding hole wall and the pipe, and the brazing material is filled into the gap during brazing, thereby increasing the welding strength.

[0008] Preferably, a limiting ring is further provided at the bottom of the welding hole, a through hole is provided in the middle of the limiting ring, and an inclined guide surface is further provided at the front end of the welding hole.

[0009] Through the above technical means, the depth of the tube inserted into the welding hole can be conveniently determined by the limit ring, so as to facilitate the control of the accuracy of the tube insertion depth, and prevent the solder from flowing into the connecting hole. It is convenient to observe whether the tube is inserted in place through the through hole, and the inclined guide surface is provided at the front end of the welding hole to guide the insertion of the tube and increase the insertion speed.

[0010] Preferably, a butt ring is provided at the bottom of the connecting hole, a ball head sleeve and a ball head body are provided in the connecting hole, the ball head body is provided in the ball head sleeve, the ball head sleeve is installed in the connecting hole, the bottom of the ball head sleeve is against the butt ring, and a fixing part for fixing the ball head sleeve is also provided in the connecting hole.

[0011] Through the above technical means, by arranging a ball head sleeve in the connecting hole, the installation efficiency of the ball head body is increased, the ball head sleeve is supported by a retaining ring, and the ball head sleeve is fixed by a fixing piece to achieve the installation of the ball head body.

[0012] Preferably, the fixing member comprises a retaining spring, and a retaining groove is further provided on the inner wall of the connecting hole, and the retaining spring cooperates with the retaining groove to press the ball head cover.

[0013] Through the above technical means, the fixing and disassembly of the ball head cover are facilitated by the cooperation between the retaining spring and the retaining groove.

[0014] Preferably, the ball head sleeve comprises a pair of semicircular ring sleeves, a first grease groove is provided inside the semicircular ring sleeves, and a second grease groove is provided on the ball head body, and the first grease groove and the second grease groove are used for storing grease.

[0015] Through the above technical means, a pair of semicircular ring sleeves are spliced ​​into a ball head sleeve, thereby facilitating the installation of the ball head body. By opening the first grease groove and the second grease groove, the friction between the ball head body and the ball head sleeve is reduced by grease, thereby increasing the service life of the ball head body.

[0016] The second object of the utility model is to provide an engine metal pipe, which has the advantages of high welding efficiency and welding precision.

[0017] The technical solution of the utility model is: an engine metal tube, comprising a tube body and a ball head structure, one end of the tube body is provided with a welding head matched with a welding hole, and the welding head and the inner tooth hole are in interference fit.

[0018] Through the above technical means, the welding head and the internal tooth hole are interference fit, so as to improve the torque after the welding head is pressed in, thereby ensuring the assembly accuracy and welding efficiency.

[0019] Preferably, a convex block is further provided on the welding head, and a positioning groove is further provided in the welding hole, and the convex block is adapted to the positioning groove.

[0020] Through the above technical means, through the cooperation between the protrusion and the positioning groove, the installation angle can be roughly confirmed before press-fitting, thus preventing press-fitting errors and further increasing the positioning accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of embodiment 1;

[0022] Figure 2 It is a structural schematic diagram of the ball head housing;

[0023] Figure 3 is a cross-sectional schematic diagram of embodiment 1;

[0024] Figure 4 It is a side view schematic diagram of embodiment 1;

[0025] Figure 5 It is a structural schematic diagram of Embodiment 2;

[0026] Figure 6 It is a structural schematic diagram of the welding head;

[0027] Figure 7 It is a side view schematic diagram of the ball head housing in the second embodiment.

[0028] Figure numerals: 1. ball head housing; 2. welding part; 3. connecting part; 4. welding hole; 5. connecting hole; 6. ball head sleeve; 7. ball head body; 8. output rod; 9. straight teeth; 10. inner tooth hole; 11. limit ring; 12. through hole; 13. inclined guide surface; 14. abutment ring; 15. fixing piece; 16. retaining ring; 17. retaining groove; 18. semicircular ring sleeve; 19. first grease groove; 20. second grease groove; 21. tube body; 22. welding head; 23. bump; 24. positioning groove. DETAILED DESCRIPTION

[0029] The specific implementation modes of the present invention are further described below in conjunction with the accompanying drawings to make the technical solutions of the present invention easier to understand and grasp. Embodiment 1:

[0030] A ball head structure includes a ball head shell 1, the ball head shell 1 includes a welding part 2 and a connecting part 3, the welding part 2 is provided with a welding hole 4, the connecting part 3 is provided with a connecting hole 5, a ball head sleeve 6 and a ball head body 7 are arranged in the connecting hole 5, the ball head body 7 is arranged in the ball head sleeve 6, output rods 8 are arranged on both sides of the ball head body 7, straight pattern teeth 9 are arranged in the welding hole 4, the highest tooth tops of the straight pattern teeth 9 form an inner tooth hole 10, the straight pattern teeth 9 and the ball head shell 1 are integrally formed by cold heading, and the inner tooth hole 10 is finely processed by a lathe after forming to ensure the accuracy of the inner tooth hole 10, when welding, the tube is in contact with the straight pattern teeth 9, and when the solder is melted, the solder will fill into the gap, so that the welding strength is higher and the welding is more stable.

[0031] A limiting ring 11 is also provided at the bottom of the welding hole 4, and the limiting ring 11 is also integrally formed with the ball head housing 1. Before welding, the pipe is first inserted into the welding hole 4, and the end of the pipe is pressed against the end face of the limiting ring 11. At this time, the solder cannot flow into the connecting hole 5. A through hole 12 is provided in the middle of the limiting ring 11. Through the connecting hole 5 and the through hole 12, it can be observed whether the pipe is plugged in place. An inclined guide surface 13 is also provided at the front end of the welding hole 4. When the pipe is plugged in, the inclined guide surface 13 can guide the pipe to increase the plug-in speed.

[0032] A butt ring 14 is provided at the bottom of the connecting hole 5, and the ball head sleeve 6 is installed in the connecting hole 5, and its bottom is against the butt ring 14. A fixing part 15 for fixing the ball head sleeve 6 is also provided in the connecting hole 5, and the fixing part 15 is preferably a retaining spring 16. A retaining groove 17 is also provided at the inner wall of the connecting hole 5, and the retaining spring 16 cooperates with the retaining groove 17 and presses the ball head sleeve 6. The ball head sleeve 6 is composed of a pair of semicircular ring sleeves 18. When installing the ball head body 7, first put the semicircular ring on the outside of the ball head body 7, and then put the semicircular ring and the ball head body 7 into the connecting hole 5 together, and make the bottom of the ball head sleeve 6 resist the butt ring 14, and then insert the retaining spring 16 into the retaining groove 17 to complete the installation. A first grease groove 19 is provided inside the semicircular ring sleeve 18, and a second grease groove 20 is provided on the ball head body 7. The first grease groove 19 and the second grease groove 20 are used to store grease. The grease reduces the friction between the ball head body 7 and the ball head sleeve 6, thereby increasing the service life of the ball head body 7. Embodiment 2:

[0033] An engine metal tube includes a tube body 21 and a ball head structure. The tube body 21 and the ball head structure are fixed by welding. A welding head 22 cooperating with the welding hole 4 is provided at one end of the tube body 21. The welding head 22 and the inner tooth hole 10 are in interference fit. When the welding head 22 and the inner tooth hole 10 are in interference fit, a press-fitting device is required to insert the welding head 22 into the inner tooth hole 10. When the welding head 22 is inserted into the inner tooth hole 10, the torque is increased due to the straight-grained teeth 9, making it more difficult to rotate between the welding head 22 and the ball head structure, thereby improving the assembly accuracy. A protrusion 23 is also provided on the welding head 22, and a positioning groove 24 is also provided in the welding hole 4. Through the cooperation of the protrusion 23 and the positioning groove 24, the installation angle can be roughly confirmed before press-fitting, thereby preventing press-fitting errors and further increasing the positioning accuracy.

[0034] Of course, the above are only typical examples of the present invention. In addition, the present invention may have many other specific implementations. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. A ball head structure, comprising a ball head shell (1), wherein the ball head shell (1) comprises a welding portion (2) and a connecting portion (3), wherein the welding portion (2) is provided with a welding hole (4), and the connecting portion (3) is provided with a connecting hole (5), wherein: A straight pattern tooth (9) is provided in the welding hole (4), the straight pattern tooth (9) forms an inner tooth hole (10), and the straight pattern tooth (9) and the ball head housing (1) are integrally formed by cold heading.

2. A ball head structure according to claim 1, characterized in that: A limiting ring (11) is also provided at the bottom of the welding hole (4), a through hole (12) is provided in the middle of the limiting ring (11), and an inclined guide surface (13) is also provided at the front end of the welding hole (4).

3. A ball head structure according to claim 1, characterized in that: A butt ring (14) is arranged at the bottom of the connecting hole (5), a ball head sleeve (6) and a ball head body (7) are arranged in the connecting hole (5), the ball head body (7) is arranged in the ball head sleeve (6), the ball head sleeve (6) is installed in the connecting hole (5), the bottom of the ball head sleeve (6) is against the butt ring (14), and a fixing part (15) for fixing the ball head sleeve (6) is also arranged in the connecting hole (5).

4. A ball head structure according to claim 3, characterized in that: The fixing member (15) comprises a retaining spring (16), and a retaining groove (17) is also provided on the inner wall of the connecting hole (5). The retaining spring (16) cooperates with the retaining groove (17) and presses the ball head cover (6).

5. The ball head structure according to claim 3, characterized in that: The ball head sleeve (6) comprises a pair of semicircular ring sleeves (18), a first grease groove (19) is provided inside the semicircular ring sleeve (18), and a second grease groove (20) is provided on the ball head body (7), and the first grease groove (19) and the second grease groove (20) are used to store lubricating grease.

6. An engine metal pipe, comprising a pipe body (21), characterized in that: It also includes a ball head structure as described in any one of claims 1 to 5, wherein a welding head (22) matching with the welding hole (4) is provided at one end of the tube body (21), and the welding head (22) is in interference fit with the inner tooth hole (10).

7. The engine metal pipe according to claim 6, characterized in that: The welding head (22) is also provided with a convex block (23), and the welding hole (4) is also provided with a positioning groove (24), and the convex block (23) is adapted to fit the positioning groove (24).

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