Cam shaft steel pipe and sub-part inner hole positioning tool

Abstract

The utility model discloses a camshaft steel pipe and sub-part inner hole positioning tool, which comprises a camshaft steel pipe, a bearing is arranged on the camshaft steel pipe, the bearing comprises an inner ring, an outer ring and a ball, the inner ring is arranged in an inner cavity of the outer ring, the ball is arranged between the inner ring and the outer ring in a rolling manner, and the outer ring is arranged in the inner cavity of the outer ring. The bearing is located at one end of the cam shaft steel pipe, the inner ring is in interference fit with the outer wall of one end of the cam shaft steel pipe, a plurality of cam shaft peach pieces are arranged on the cam shaft steel pipe and distributed at intervals, and a plurality of protrusions are arranged on the outer wall of the cam shaft steel pipe. Inner holes matched with the protrusions are formed in the cam shaft peach slices, and a plug is arranged on the cam shaft steel pipe. By arranging the protrusions, the mode that the protrusions are arranged on the outer wall of the camshaft steel pipe and matched with the inner holes in the camshaft peach piece for positioning is adopted, machining and assembling of sub-parts are better facilitated, and the mechanical performance of camshaft products is well guaranteed and improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of camshafts, and in particular relates to a camshaft steel pipe and a sub-component inner hole positioning tool. Background Art

[0002] As the core part of the automobile engine valve mechanism, the camshaft controls the movement law and opening and closing time of the valve, determines the engine's charging efficiency, and affects the engine's economy, power and emission performance. With the increasingly stringent fuel consumption and emission regulations, camshafts are developing in the direction of high performance, light weight and low cost. The combined camshaft is the product of this era. At present, major automobile manufacturers in the world are increasingly applying combined camshafts to high-performance engines. Therefore, the combined camshaft technology and development trend are of great significance to promoting the development of my country's automobile engine technology in the direction of high performance, light weight and low cost.

[0003] The current manufacturing technology of modular camshafts: The modular camshaft is a new type of combined design and modern manufacturing model that divides the camshaft into several assembleable parts such as cams, core shafts, plugs, etc., and performs material optimization and lean processing on each part, and then assembles them into an integral camshaft.

[0004] In the existing tube expansion assembly process, when positioning the camshaft, the connection strength between the camshaft and the inner holes of the sub-components is low and needs to be improved. Utility Model Content

[0005] In view of the above-mentioned problem that the connection strength between the camshaft and the inner holes of the sub-components is low when the camshaft is positioned, the utility model provides a camshaft steel pipe and a sub-component inner hole positioning tool.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a camshaft steel tube and sub-part inner hole positioning tool, including a camshaft steel tube, a bearing is arranged on the camshaft steel tube, the bearing includes an inner ring, an outer ring and a ball, the inner ring is arranged in the inner cavity of the outer ring, the ball is rolled and arranged between the inner ring and the outer ring, a plurality of camshaft peaches are arranged on the camshaft steel tube, the plurality of camshaft peaches are distributed at intervals, a plurality of protrusions are arranged on the outer wall of the camshaft steel tube, the plurality of camshaft peaches are each provided with an inner hole compatible with the plurality of protrusions, and a plug is arranged on the camshaft steel tube.

[0007] Preferably, the bearing is located at one end of the camshaft steel tube, and the inner ring is interference fit with the outer wall of one end of the camshaft steel tube.

[0008] Preferably, the specific number of the camshaft peach pieces is four, and the four camshaft peach pieces are arranged at different phase angles on the camshaft steel tube.

[0009] Preferably, a boss is provided on the camshaft steel tube, one end of the boss contacts one end of the inner ring, and the height of the boss is lower than that of the inner ring.

[0010] Preferably, the specific number of the protrusions and inner holes is six, and the six protrusions and inner holes are distributed in a ring array.

[0011] Preferably, the camshaft steel tube and the plurality of protrusions are an integrally formed structure.

[0012] Preferably, the camshaft steel pipe is cast from alloy cast iron or ductile iron.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. By setting a bearing and installing the bearing on one end of the camshaft steel tube, the sliding friction is converted into rolling friction through the bearing, which can significantly reduce the friction resistance at low and medium engine speeds and improve the engine thermal efficiency.

[0015] 2. By setting protrusions and adopting a positioning method in which multiple protrusions are set on the outer wall of the camshaft steel tube and matched with the inner hole on the camshaft peach, it is more conducive to the processing and assembly of sub-parts, and the mechanical properties of the camshaft product are well guaranteed and improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the bearing of the utility model;

[0018] Figure 3 For this utility model Figure 1 Schematic diagram of the structure enlarged at point A in the middle.

[0019] In the figure: 1. camshaft steel tube; 2. bearing; 21. inner ring; 22. outer ring; 23. ball; 3. camshaft peach; 4. protrusion; 5. inner hole; 6. boss; 7. plug. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0021] Reference Figure 1-3A camshaft steel tube and sub-component inner hole positioning tooling includes a camshaft steel tube 1, a bearing 2 is arranged on the camshaft steel tube 1, the bearing 2 includes an inner ring 21, an outer ring 22 and a ball 23, the inner ring 21 is arranged in the inner cavity of the outer ring 22, the ball 23 is rollingly arranged between the inner ring 21 and the outer ring 22, the bearing 2 is located at one end of the camshaft steel tube 1, and the inner ring 21 and the outer wall of one end of the camshaft steel tube 1 are interference fit, and the sliding friction is converted into rolling friction through the bearing 2, which can significantly reduce the friction resistance at low and medium speeds of the engine and improve the thermal efficiency of the engine.

[0022] A boss 6 is provided on the camshaft steel tube 1 , one end of the boss 6 contacts one end of the inner ring 21 , and the height of the boss 6 is lower than the inner ring 21 . By providing the boss 6 , the bearing 2 will not shift during operation.

[0023] Furthermore, a plurality of camshaft peaches 3 are provided on the camshaft steel tube 1, and the plurality of camshaft peaches 3 are distributed at intervals. The specific number of the camshaft peaches 3 is four, and the four camshaft peaches 3 are arranged at different phase angles on the camshaft steel tube 1. When the camshaft steel tube 1 rotates, the plurality of camshaft peaches 3 rotate accordingly, and the peach tips contact the valves paired with them in turn and push the valves open to perform air intake work.

[0024] Furthermore, a plurality of protrusions 4 are provided on the outer wall of the camshaft steel tube 1. The camshaft steel tube 1 and the plurality of protrusions 4 are an integrally formed structure. Inner holes 5 matching the plurality of protrusions 4 are provided on the plurality of camshaft peaches 3. The specific number of the protrusions 4 and the inner holes 5 is six. The six protrusions 4 and the inner holes 5 are distributed in a ring array. The plurality of protrusions 4 on the outer wall of the camshaft steel tube 1 are provided to match the inner holes 5 on the camshaft peaches 3, which is more conducive to the processing and assembly of sub-components and can well guarantee and improve the mechanical properties of the camshaft product.

[0025] Finally, a plug 7 is provided on the camshaft steel tube 1 . The camshaft steel tube 1 is cast from alloy cast iron or ductile iron, so that the camshaft steel tube 1 can withstand a large torque and can improve the strength and support of the camshaft steel tube 1 .

[0026] The operating principle of the utility model is now described as follows: by installing a bearing 2 at one end of the camshaft steel tube 1, the sliding friction is converted into rolling friction through the bearing 2, which can significantly reduce the friction resistance at low and medium engine speeds and improve the thermal efficiency of the engine. By arranging multiple protrusions 4 on the outer wall of the camshaft steel tube 1 and matching the inner hole 5 on the camshaft peach 3, it is more conducive to the processing and assembly of sub-parts, and the mechanical properties of the camshaft product are well guaranteed and improved.

[0027] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A camshaft steel tube and sub-component inner hole positioning tool, comprising a camshaft steel tube (1), characterized in that: The camshaft steel tube (1) is provided with a bearing (2), the bearing (2) comprising an inner ring (21), an outer ring (22) and a ball (23), the inner ring (21) being arranged in the inner cavity of the outer ring (22), the ball (23) being arranged to roll between the inner ring (21) and the outer ring (22), the camshaft steel tube (1) is provided with a plurality of camshaft peaches (3), the plurality of camshaft peaches (3) being distributed at intervals, the outer wall of the camshaft steel tube (1) is provided with a plurality of protrusions (4), the plurality of camshaft peaches (3) are each provided with an inner hole (5) matching the plurality of protrusions (4), and the camshaft steel tube (1) is provided with a plug (7).

2. A camshaft steel tube and sub-component inner hole positioning tool according to claim 1, characterized in that: The bearing (2) is located at one end of the camshaft steel tube (1), and the inner ring (21) is interference fit with the outer wall of one end of the camshaft steel tube (1).

3. A camshaft steel tube and sub-component inner hole positioning tool according to claim 1, characterized in that: The specific number of the camshaft peach pieces (3) is four, and the four camshaft peach pieces (3) are arranged on the camshaft steel tube (1) at different phase angles.

4. A camshaft steel tube and sub-component inner hole positioning tool according to claim 1, characterized in that: The camshaft steel tube (1) is provided with a boss (6), one end of the boss (6) is in contact with one end of the inner ring (21), and the height of the boss (6) is lower than that of the inner ring (21).

5. The camshaft steel tube and sub-component inner hole positioning tool according to claim 1, characterized in that: The specific number of the protrusions (4) and the inner holes (5) is six, and the six protrusions (4) and the inner holes (5) are distributed in a ring-shaped array.

6. A camshaft steel tube and sub-component inner hole positioning tool according to claim 1, characterized in that: The camshaft steel tube (1) and the plurality of protrusions (4) are an integrally formed structure.

7. A camshaft steel tube and sub-component inner hole positioning tool according to claim 1, characterized in that: The camshaft steel pipe (1) is cast from alloy cast iron or ductile iron.

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