Engine freewheel structure

Abstract

This utility model provides an engine idler gear structure, belonging to the field of engine technology. It includes an idler gear bearing, an idler gear shaft, and an idler gear assembly. The idler gear bearing is fixed to the engine block, and the idler gear shaft is threadedly connected to the idler gear bearing. The idler gear assembly is sleeved on the outside of the idler gear shaft and rotatably connected to it. This utility model, by disassembling the idler gear shaft into a separate unit, increases the installation space for the idler gear assembly, greatly simplifies the manufacturing process, and improves production efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of engine technology, and in particular relates to an engine idler gear structure. Background Technology

[0002] In off-road diesel engine applications, especially in machinery such as harvesters and silage harvesters, the engine front end needs to be equipped with a multi-grooved pulley to transmit power. To meet the crankshaft strength requirements of the multi-grooved pulley, engine manufacturers typically use a front-end heat-shrink crankshaft as the connection end for the engine front crankshaft pulley.

[0003] This type of heat-shrink crankshaft front end structure is simple and reliable in strength. However, in practical applications, the idler gear shaft is first installed on the engine block. Due to the excessively large size of the heat-shrink gear at the front end of the crankshaft, there is insufficient installation space for the idler gear assembly. In actual production, the engine needs to be inverted, the oil pan and crankshaft removed, the idler gear assembled, and finally the crankshaft put back and the oil pan reinstalled, which seriously affects production efficiency. Utility Model Content

[0004] In view of the defects or deficiencies in the existing technology, this utility model provides an engine idler gear structure. By splitting the idler gear shaft into a split type, the installation space of the idler gear assembly is increased, the production process is greatly simplified, and the production efficiency is improved.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An embodiment of this utility model provides an engine idler gear structure, including an idler gear bearing seat, an idler gear shaft, and an idler gear assembly. The idler gear bearing seat is fixed on the engine body, the idler gear shaft is threadedly connected to the idler gear bearing seat, and the idler gear assembly is sleeved on the outside of the idler gear shaft and rotatably connected to the idler gear shaft.

[0007] Furthermore, the longitudinal section of the idler gear shaft seat is T-shaped, including an installation section and an anti-wear section, which are coaxially arranged.

[0008] Furthermore, the mounting section is cylindrical, and the engine block is provided with an idler gear hole, with the mounting section and the idler gear hole being interference-fitted.

[0009] Furthermore, an installation hole is provided in the middle of the end face of the anti-wear section away from the installation section, and an internal thread is provided in the installation hole.

[0010] Furthermore, an inner stop is provided at one end of the mounting hole near the end face of the wear-resistant section, and an outer stop is provided on the idler gear shaft, with the inner stop and the outer stop cooperating with each other.

[0011] Furthermore, the idler gear shaft has a stepped structure, including a threaded section, a connecting section, a baffle, and an external hexagonal nut. The threaded section, connecting section, baffle, and external hexagonal nut are arranged in sequence, and the external stop is located at the end of the threaded section near the connecting section.

[0012] Furthermore, the outer wall of the threaded section is provided with an external thread, which is adapted to the internal thread of the mounting hole.

[0013] Furthermore, the diameter of the connecting section is larger than the diameter of the threaded section, and it is used to connect the idler gear assembly. The width of the connecting section is adapted to the idler gear assembly. The idler gear assembly is sleeved on the outside of the connecting section and is rotatably connected to the connecting section.

[0014] Furthermore, the baffle is located on the side of the connecting section away from the threaded section, and the baffle is disc-shaped with a diameter larger than the diameter of the idler gear assembly shaft hole.

[0015] Furthermore, the external hexagonal nut is disposed on the end face of the baffle away from the connecting section.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] This utility model, by setting an idler gear shaft seat and an idler gear shaft, wherein the idler gear shaft seat is fixed on the engine block, the idler gear shaft is threadedly connected to the idler gear shaft seat, and the idler gear assembly is sleeved on the outside of the idler gear shaft and rotatably connected to the idler gear shaft, thereby splitting the original idler gear shaft into a split type, increasing the installation space of the idler gear assembly, eliminating the need to flip the engine block, greatly simplifying the production process, and improving production efficiency. Attached Figure Description

[0018] Figure 1 This is an exploded view of the idler gear structure in an embodiment of this utility model;

[0019] Figure 2 This is a sectional view of the idler gear shaft seat in an embodiment of this utility model;

[0020] Figure 3 This is a sectional view of the idler gear shaft in an embodiment of this utility model;

[0021] Figure 4 This is a cross-sectional view of the idler gear assembly in an embodiment of this utility model;

[0022] Figure 5 This is a cross-sectional view of the idler gear structure in an embodiment of this utility model;

[0023] Among them, 1. Idler gear shaft seat; 101. Mounting section; 102. Anti-wear section; 103. Mounting hole; 104. Inner stop; 2. Idler gear shaft; 201. Threaded section; 202. Connecting section; 203. Baffle; 204. External hexagonal nut; 205. External stop; 3. Idler gear assembly; 301. Idler gear; 302. Bushing; 4. Engine block; 5. First oil hole; 6. Receiving cavity; 7. First annular oil groove; 8. Lubricating oil hole; 9. Second oil hole; 10. Second annular oil groove. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] A typical embodiment of this utility model is as follows: Figure 1 As shown, an engine idler gear structure includes an idler gear bearing 1, an idler gear shaft 2, and an idler gear assembly 3. The idler gear bearing 1 is fixed on the engine body 4. The idler gear shaft 2 is threadedly connected to the idler gear bearing 1. The idler gear assembly 3 is sleeved on the outside of the idler gear shaft 2 and is rotatably connected to the idler gear shaft 2.

[0026] like Figure 2 As shown, the longitudinal section of the idler gear bearing 1 is T-shaped, including an installation section 101 and an anti-wear section 102. The installation section 101 is cylindrical, and an idler gear hole is provided on the engine block 4. The installation section 101 and the idler gear hole are interference-fitted, thereby fixing the idler gear bearing 1 to the engine block 4. The anti-wear section 102 is disc-shaped, located at one end of the installation section 101, and is coaxially arranged with the installation section 101. By setting the anti-wear section 102, the idler gear 301 and the engine block 4 can be separated by a set distance, avoiding interference of the engine block 4 with the rotation of the idler gear 301.

[0027] A mounting hole 103 is provided in the middle of the end face of the wear-resistant section 102 away from the installation section 101. An internal thread is provided in the mounting hole 103, which can be used to connect and fix it with the idler gear shaft 2. An inner stop 104 is provided at the end of the mounting hole 103 near the end face of the wear-resistant section 102. An outer stop 205 is provided on the idler gear shaft 2. The inner stop 104 and the outer stop 205 cooperate to achieve the positioning of the idler gear shaft seat 1 and the idler gear shaft 2 by setting the inner stop 104 and the outer stop 205, and ensure the coaxiality of the idler gear shaft seat 1 and the idler gear shaft 2.

[0028] like Figure 3As shown, the idler gear shaft 2 has a stepped structure, including a threaded section 201, a connecting section 202, a baffle 203, and an external hexagonal nut 204. The threaded section 201, connecting section 202, baffle 203, and external hexagonal nut 204 are arranged in sequence. An external stop 205 is provided at one end of the threaded section 201 near the connecting section 202. The outer wall of the threaded section 201 is provided with an external thread, which is adapted to the internal thread of the mounting hole 103. The idler gear shaft 2 and the idler gear seat 1 are fixedly installed through the threaded connection between the threaded section 201 and the mounting hole 103. The diameter of the connecting section 202 is larger than the diameter of the threaded section 201 and is used to connect the idler gear assembly 3. The width of the connecting section 202 is adapted to the idler gear assembly 3. The idler gear assembly 3 is sleeved on the outside of the connecting section 202 and is rotatably connected to the connecting section 202.

[0029] The baffle 203 is located on the side of the connecting section 202 away from the threaded section 201. The baffle 203 is disc-shaped and its diameter is larger than the diameter of the shaft hole of the idler gear assembly 3. The baffle 203 cooperates with the anti-wear section 102 to limit the idler gear assembly 3 and prevent the idler gear 301 from shaking when rotating. The external hexagonal nut 204 is set on the end face of the baffle 203 away from the connecting section 202. By setting the external hexagonal nut 204, the idler gear shaft 2 can be directly fixed on the idler gear shaft seat 1 by an electric wrench, which improves the assembly efficiency.

[0030] like Figure 4 As shown, the idler gear assembly 3 includes an idler gear 301 and a bushing 302. The bushing 302 is fixed in the middle shaft hole of the idler gear 301. The bushing 302 is adapted to the connecting section 202 of the idler gear shaft 2, thereby ensuring the rotational connection between the idler gear 301 and the idler gear shaft 2.

[0031] like Figure 5 As shown, a first oil hole 5 is provided on the outer surface of the mounting section 101 of the idler gear bearing 1, and a receiving cavity 6 is provided at the bottom of the mounting hole 103. The first oil hole 5 is connected to the receiving cavity 6. A first annular oil groove 7 is provided on the outer surface of the mounting section 101. The first annular oil groove 7 is correspondingly provided to the first oil hole 5. A lubricating oil hole 8 is provided on the inner wall of the idler gear hole of the engine body 4. When the idler gear bearing 1 is fixed in the idler gear hole of the engine body 4, the lubricating oil hole 8 is connected to the first oil hole 5 through the first annular oil groove 7. The lubricating oil enters the receiving cavity 6 through the lubricating oil hole 8, the first annular oil groove 7 and the first oil hole 5.

[0032] A second oil hole 9 is provided on the idler gear shaft 2. The inlet end of the second oil hole 9 is located in the middle of the end face of the threaded section 201 away from the connecting section 202, and the outlet end of the second oil hole 9 is located on the outer wall of the connecting section 202. When the idler gear shaft 2 is fixed on the idler gear bearing 1, the second oil hole 9 is connected to the receiving cavity 6. A second annular oil groove 10 is provided on the inner wall of the bushing 302. When the idler gear assembly 3 is sleeved on the idler gear shaft 2, the outlet end of the second oil hole 9 corresponds to the second annular oil groove 10. The lubricating oil in the receiving cavity 6 flows to the inner surface of the connecting section 202 and the bushing 302 through the second oil hole 9 and the second annular oil groove 10, thereby achieving the lubrication effect.

[0033] This utility model, by setting an idler gear shaft seat and an idler gear shaft, wherein the idler gear shaft seat is fixed on the engine block, the idler gear shaft is threadedly connected to the idler gear shaft seat, and the idler gear assembly is sleeved on the outside of the idler gear shaft and rotatably connected to the idler gear shaft, thereby splitting the original idler gear shaft into a split type, increasing the installation space of the idler gear assembly, eliminating the need to flip the engine block, greatly simplifying the production process, and improving production efficiency.

[0034] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An engine idler gear structure, characterized in that, It includes an idler gear bearing seat, an idler gear shaft, and an idler gear assembly. The idler gear bearing seat is fixed to the engine block, the idler gear shaft is threaded to the idler gear bearing seat, and the idler gear assembly is sleeved on the outside of the idler gear shaft and rotatably connected to the idler gear shaft.

2. The engine idler gear structure as described in claim 1, characterized in that, The longitudinal section of the idler gear shaft seat is T-shaped, including an installation section and an anti-wear section, which are coaxially arranged.

3. The engine idler gear structure as described in claim 2, characterized in that, The mounting section is cylindrical, and the engine block is provided with an idler gear hole. The mounting section is interference-fitted with the idler gear hole.

4. The engine idler gear structure as described in claim 2, characterized in that, The wear-resistant section has a mounting hole in the middle of the end face away from the installation section, and the mounting hole has an internal thread.

5. The engine idler gear structure as described in claim 4, characterized in that, An inner stop is provided at one end of the mounting hole near the end face of the anti-wear section, and an outer stop is provided on the idler gear shaft. The inner stop and the outer stop cooperate with each other.

6. The engine idler gear structure as described in claim 5, characterized in that, The idler gear shaft has a stepped structure, including a threaded section, a connecting section, a baffle, and an external hexagonal nut. The threaded section, connecting section, baffle, and external hexagonal nut are arranged in sequence, and the external stop is located at the end of the threaded section near the connecting section.

7. The engine idler gear structure as described in claim 6, characterized in that, The outer wall of the threaded section is provided with an external thread, which is adapted to the internal thread of the mounting hole.

8. The engine idler gear structure as described in claim 7, characterized in that, The diameter of the connecting section is larger than that of the threaded section, and it is used to connect the idler gear assembly. The width of the connecting section is adapted to the idler gear assembly. The idler gear assembly is sleeved on the outside of the connecting section and is rotatably connected to the connecting section.

9. The engine idler gear structure as described in claim 7, characterized in that, The baffle is located on the side of the connecting section away from the threaded section. The baffle is disc-shaped and its diameter is larger than the diameter of the idler gear assembly shaft hole.

10. The engine idler gear structure as described in claim 7, characterized in that, The external hexagonal nut is located on the end face of the baffle away from the connecting section.

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