An idler gear shaft for an engine

Abstract

This utility model relates to the field of power component technology, specifically to an idler gear shaft for an engine. It includes a shaft body with a protrusion fixed at one end. An oil guide channel is formed inside the shaft body, and an oil outlet communicating with the oil guide channel is formed on the outer side of the shaft body. An oil inlet communicating with the oil guide channel is formed on the protrusion. A centrifugal guide mechanism is fixedly installed inside the oil outlet. The centrifugal guide mechanism includes at least one L-shaped guide vane. The horizontal section of the L-shaped guide vane is embedded in the inner wall of the oil outlet, and the vertical section of the L-shaped guide vane extends outward from the shaft body. An oblique guide groove is formed at the end of the vertical section, and the inclination direction of the oblique guide groove is consistent with the rotation direction of the idler gear. This utility model can solve the problems of fatigue wear and insufficient lubrication reliability of traditional spring-driven oil guide mechanisms.

Description

Technical Field

[0001] This utility model relates to the field of power component technology, specifically to an idler gear shaft for an engine. Background Technology

[0002] The idler gear shaft is a key component for transmitting power and changing steering, and its lubrication performance directly affects engine reliability. Existing technology, such as the patent with authorization publication number CN215521591U, discloses an idler gear shaft for engines. This shaft uses an internal oil guide channel to guide lubricating oil from the outlet, and a guide mechanism consisting of a moving sleeve, a return spring, and a limiting ring to adjust the lubricating oil distribution. When the idler gear rotates at high speed, the sliding sleeve opens the adjustment port, allowing lubricating oil to be discharged from the inside of the gear to achieve uniform distribution.

[0003] However, the above structure has reliability defects: the return spring needs to withstand frequent alternating pressure and centrifugal force, which can easily lead to fatigue failure after long-term use, resulting in poor reset of the moving sleeve; the sliding fit between the moving sleeve and the inner wall of the oil outlet is prone to accelerated wear when the lubricating oil contains impurities, causing increased clearance and leakage; the rubber abutment is prone to aging after long-term immersion in lubricating oil, affecting sealing performance. These problems cause the oil guiding mechanism to fail under long-term high-speed operating conditions, making it unable to continuously ensure uniform distribution of lubricating oil, which in turn leads to increased friction and wear of the idler wheel, affecting the service life of the engine. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide an idler gear shaft for an engine to solve the problems of easy fatigue wear and insufficient lubrication reliability of the above-mentioned spring-driven oil guide mechanism.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] An idler gear shaft for an engine includes a shaft body, a protrusion fixed at one end of the shaft body, an oil guide passage inside the shaft body, and an oil outlet communicating with the oil guide passage on the outer side of the shaft body. An oil inlet communicating with the oil guide passage is opened on the protrusion. A centrifugal flow guiding mechanism is fixedly installed inside the oil outlet. The centrifugal flow guiding mechanism includes at least one L-shaped flow guiding vane. The horizontal section of the L-shaped flow guiding vane is embedded in the inner wall of the oil outlet. The vertical section of the L-shaped flow guiding vane extends outward from the shaft body, and an oblique flow guiding groove is opened at the end of the vertical section. The inclination direction of the oblique flow guiding groove is consistent with the rotation direction of the idler gear.

[0007] As a further improvement of this utility model, the oil outlet is provided with three outlets, which are evenly distributed along the circumference of the shaft.

[0008] As a further embodiment of this utility model: the centrifugal guide mechanism includes two L-shaped guide vanes, which are symmetrically arranged on both sides of the oil outlet, corresponding to the forward and reverse rotation of the idler wheel respectively.

[0009] As a further improvement of this utility model, a connecting groove is provided on the outer peripheral surface of the shaft corresponding to the oblique guide groove.

[0010] As a further improvement of this utility model, the depth of the inclined guide channel gradually increases along the direction away from the oil outlet until the inclined guide channel connects with the connecting channel.

[0011] As a further improvement of this utility model, the surface roughness Ra of the inclined guide channel and the connecting channel is ≤0.8μm.

[0012] By adopting the above technical solution, this utility model will have the following beneficial effects:

[0013] By combining an L-shaped guide vane with an angled guide groove, centrifugal force is used to directly drive the directional flow of lubricating oil, eliminating the need for a traditional spring-sliding sleeve structure and fundamentally avoiding the risk of spring fatigue failure, thus significantly improving the long-term reliability of the oil guiding mechanism. The horizontal section of the L-shaped guide vane is embedded in the inner wall of the oil outlet for stable installation, while the extended vertical section ensures precise guidance of the lubricating oil under centrifugal force, solving the problem of uneven lubrication caused by sliding fit clearances in traditional structures and improving lubrication efficiency. The angled guide groove's inclination direction is consistent with the idler wheel's rotation direction, matching the lubricating oil flow direction with the gear meshing motion, reducing oil impact loss, and enhancing the timeliness and uniformity of lubrication.

[0014] Compared with the existing spring-driven oil guiding mechanism, the centrifugal guiding mechanism adopted in this utility model, together with the through design of the oil guiding channel, oil outlet and oil inlet, forms an oil circuit system with no power loss, which simplifies the transmission components, reduces maintenance requirements, and is suitable for stable lubrication requirements under high-speed conditions. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a perspective view of the idler gear shaft of the engine described in an embodiment of the present utility model;

[0017] Figure 2 for Figure 1 Right view of the idler gear shaft of the engine described in the embodiment;

[0018] Figure 3 for Figure 2 Sectional view along the middle AA direction;

[0019] Figure 4 for Figure 1 A partial sectional view of the idler gear shaft of the engine described in the embodiment, in its operating state.

[0020] The correspondence between the labels and component names in the attached figures is as follows:

[0021] 1. Shaft; 2. Protrusion; 3. Oil guide channel; 4. Oil outlet; 5. Oil inlet; 6. L-shaped guide vane; 7. Angled guide groove; 8. Connecting groove; 9. Idler wheel. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0023] Please refer to Figure 1-4 In one embodiment of the idler gear shaft of an engine provided by this utility model, the basic structure of the idler gear shaft is consistent with the original patent, including a shaft body 1. One end of the shaft body 1 is integrally formed with a protrusion 2 by forging. An oil guide channel 3 is opened axially inside the shaft body 1, and a plurality of oil outlets 4 are opened on the outer side of the shaft body 1 (the specific number is adapted according to the size of the idler gear 9). The oil outlets 4 are perpendicularly connected to the oil guide channel 3. An oil inlet 5 is opened on the protrusion 2, and the oil inlet 5 is connected to the oil guide channel 3 through an oblique oil channel, forming a complete oil circuit of "oil inlet 5 → oil guide channel 3 → oil outlet 4". The improvement of this embodiment is:

[0024] 1. Centrifugal flow guiding mechanism

[0025] A centrifugal flow guiding mechanism is fixedly installed inside the oil outlet 4. This mechanism includes two L-shaped flow guide vanes 6 symmetrically arranged on both sides of the oil outlet 4, with the two L-shaped flow guide vanes 6 corresponding to the forward and reverse rotation of the idler wheel 9, respectively. The L-shaped flow guide vanes 6 are made of 45# steel, and their horizontal sections are embedded in the mounting grooves on the inner wall of the oil outlet 4 through an interference fit. The embedding depth is 1 / 2 of the thickness of the L-shaped flow guide vane 6. The interference fit embedding structure can buffer vibration and avoid fluctuations in oil flow due to rigid contact. The vertical section of the L-shaped flow guide vane 6 extends outward from the shaft body 1 to near the outer circumference of the shaft body 1, and the extension length is 1 / 3 of the diameter of the shaft body 1. The end face of the vertical section of the flow guide vane is obliquely cut with a diagonal flow guide groove 7.

[0026] The inclined angle of the inclined guide channel 7 is 25°-45° (preferably 30°), and the inclined direction is consistent with the rotation direction of the idler wheel 9 (e.g., Figure 4 (As shown). A connecting groove 8 is provided on the outer circumference of the shaft 1 at the corresponding oblique guide groove 7 to extend the guide length. Specifically, the inclination angle of the connecting groove 8 is the same as that of the oblique guide groove 7, and the depth of the oblique guide groove 7 gradually increases in the direction away from the oil outlet 4 until the oblique guide groove 7 and the connecting groove 8 are connected. When the idler wheel 9 rotates at high speed, the lubricating oil enters the oil outlet 4 through the oil guide channel 3, and is thrown out along the oblique direction of the oblique guide groove 7 → connecting groove 8 under the action of centrifugal force, directly acting on the contact surface between the idler wheel 9 and the shaft 1. Preferably, the surfaces of the oblique guide groove 7 and the connecting groove 8 are treated with a honing process, and the surface roughness is controlled to Ra≤0.8μm to reduce the flow resistance of the lubricating oil.

[0027] 2. Distribution and number of oil outlets 4

[0028] In this embodiment, a shaft 1 with a diameter of 50-80mm is used. The shaft 1 has three square oil outlets 4 evenly distributed around its circumference. The central angle between adjacent oil outlets 4 is 120°. The side length of each oil outlet 4 is 8-10mm, ensuring that the lubricating oil is evenly covered under high-speed conditions (2000-4000r / min).

[0029] The working principle of this utility model is as follows:

[0030] Lubricating oil enters the oil guide channel 3 through the oil inlet 5. Under the centrifugal force generated by the rotation of the idler wheel 9, the lubricating oil flows through the oil outlet 4 to the L-shaped guide vane 6, and is guided along the inclined direction of the inclined guide groove 7 → connecting groove 8 to the contact surface between the idler wheel 9 and the shaft 1. Since the inclined direction of the inclined guide groove 7 is consistent with the rotation direction of the idler wheel 9, the lubricating oil, under the dual action of centrifugal force and the guidance of the inclined guide groove 7, forms a directional oil flow that matches the movement trajectory of the idler wheel 9, directly covering the contact surface between the idler wheel 9 and the shaft 1, avoiding the lubrication blind zone caused by oil scattering and the uneven lubrication caused by poor spring return in traditional structures.

[0031] Effect verification:

[0032] By comparing the performance of this utility model with the prior art (CN215521591U) through bench tests, after 500 hours of continuous operation at 4000r / min, the flow guiding mechanism of this utility model showed no wear and no leakage, while the traditional structure showed a lubricating oil distribution deviation of >15% after 300 hours due to spring fatigue; and the traditional structure required spring replacement on average every 200 hours, while this utility model can achieve 1000 hours of maintenance-free operation.

[0033] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An idler gear shaft of an engine, comprising a shaft body (1), a protrusion (2) fixed to one end of the shaft body (1), an oil guide channel (3) formed in the shaft body (1), an oil outlet (4) formed on the outer side of the shaft body (1) and communicating with the oil guide channel (3), and an oil inlet (5) formed on the protrusion (2) and communicating with the oil guide channel (3); characterized in that, A centrifugal guide mechanism is fixedly installed inside the oil outlet (4). The centrifugal guide mechanism includes at least one L-shaped guide vane (6). The horizontal section of the L-shaped guide vane (6) is embedded in the inner wall of the oil outlet (4). The vertical section of the L-shaped guide vane (6) extends outward from the shaft (1), and an oblique guide groove (7) is opened at the end of the vertical section. The inclination direction of the oblique guide groove (7) is consistent with the rotation direction of the idler wheel (9).

2. The idler gear shaft of the engine according to claim 1, characterized in that, There are 3 oil outlets (4), and the 3 oil outlets (4) are evenly distributed along the circumference of the shaft (1).

3. The idler gear shaft of the engine according to claim 1, characterized in that, The centrifugal guide mechanism includes two L-shaped guide vanes (6), which are symmetrically arranged on both sides inside the oil outlet (4) and correspond to the forward and reverse rotation of the idler wheel (9).

4. The idler gear shaft of the engine according to claim 1, characterized in that, The shaft (1) has a connecting groove (8) on its outer circumference corresponding to the oblique guide groove (7).

5. The idler gear shaft of the engine according to claim 4, characterized in that, The depth of the inclined guide channel (7) gradually increases in the direction away from the oil outlet (4) until the inclined guide channel (7) connects with the connecting channel (8).

6. The idler gear shaft of the engine according to claim 4 or 5, characterized in that, The surface roughness Ra of the inclined guide groove (7) and the connecting groove (8) is ≤0.8μm.

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