Efficient heavy-load overrunning belt pulley with double isolators

Abstract

The invention belongs to the technical field of automobile generators, and relates to an efficient heavy-load double-isolator overrunning belt pulley which comprises a belt pulley shell and a mandrel arranged in the belt pulley shell. A three-section type isolator assembly and a single-section type isolator assembly are arranged between the inner wall of the belt pulley shell and the outer wall of the mandrel side by side in a left-right mode and are arranged in a sealed mode through a rubber sealing ring and a metal sealing ring. In the three-section type isolator assembly, needle bearings used for supporting a belt pulley shell and a mandrel are arranged on the two sides, and a first one-way needle bearing is arranged in the middle of the three-section type isolator assembly. A second one-way needle bearing is arranged in the single-section isolator assembly; the first one-way needle bearing and the second one-way needle bearing are used for one-way overrunning and bearing supporting. The double-isolator overrunning belt pulley can improve the bearing capacity of the belt pulley, improves the reliability and the stability, is low in cost, and is particularly suitable for being applied to commercial vehicle generator belt pulleys.

Description

Technical Field

[0001] This invention belongs to the field of automotive generator technology and relates to a high-efficiency heavy-duty dual one-way repeater pulley. Background Technology

[0002] Traditional automotive alternator pulleys are typically rigid pulleys that operate synchronously with the engine speed. As the engine speed changes, the alternator speed also changes. Due to the alternating operation of the cylinders, the engine's output torque and speed are uneven (generally exhibiting a sinusoidal wave shape). Particularly in the front-end pulley system, where the engine and alternator speeds are relatively high, the alternator rotor's equivalent moment of inertia is large. This causes momentary asynchrony between the alternator rotor speed and the engine speed, resulting in impacts and slippage between the belt and pulley, generating noise and reducing belt life. This reduces the lifespan of the entire front-end pulley system. These vibrations, noises, and roughness (NVH) significantly reduce the overall vehicle comfort.

[0003] As the application of new energy vehicles becomes more widespread, the market growth of traditional gasoline vehicles has been captured by new energy vehicles, but completely replacing gasoline vehicles is impossible in the near future. Although the automotive industry is reducing its R&D investment in gasoline vehicles, the requirements for energy conservation and emission reduction in gasoline vehicles are becoming increasingly stringent. Small-displacement, high-pressure engines are the main direction of gasoline vehicle development. Therefore, engine speed fluctuations will also increase. On the other hand, due to the reduced incremental growth, the need for cost reduction is becoming increasingly urgent. The market needs a highly efficient, heavy-duty, and low-cost unidirectional overrunning generator pulley.

[0004] Commercial vehicles, in particular, are mostly equipped with diesel engines, which have large speed fluctuations and high generator power. Their load is two to three times that of gasoline vehicle generators, and the one-way pulleys in the current technology cannot meet the service life requirements.

[0005] Existing Chinese patent application CN201810131966.7 describes a double-row one-way pulley scheme with a ball bearing at each end. Chinese patent application CN202122839702.7 is essentially the same as CN201810131966.7, except that an inner ring is added to the one-way pulley. This double ball bearing scheme not only increases cost, but also, because ball bearings are point contact bearings, cannot meet the heavy-load requirements of the front-end pulley system composed of a diesel engine and generator in commercial vehicles.

[0006] Therefore, there is an urgent need in the market for a low-cost, shock-absorbing, stable, and low-cost unidirectional overtaking pulley. Summary of the Invention

[0007] To address the aforementioned technical problems in existing technologies, this invention provides a high-efficiency, heavy-duty double one-way pulley. It utilizes needle roller bearings on both sides of a three-section one-way pulley for radial support, and employs metal sealing rings and pulley housing groove riveting technology for axial limiting. This reduces costs and significantly enhances radial load-bearing capacity through the line contact of the needle roller bearings. The specific technical solution is as follows: A high-efficiency, heavy-duty, dual-one-way overtaking pulley includes: a pulley housing and a spindle disposed therein; a three-section one-way assembly and a single-section one-way assembly are arranged side-by-side between the inner wall of the pulley housing and the outer wall of the spindle and sealed by rubber and metal sealing rings; in the three-section one-way assembly, needle roller bearings for supporting the pulley housing and the spindle are arranged on both sides, and a first one-way needle roller bearing is arranged in the middle; a second one-way needle roller bearing is arranged in the single-section one-way assembly; the first and second one-way needle roller bearings are used for one-way overtaking and load-bearing support.

[0008] Preferably, the outer wall of the mandrel has a two-step surface, and the three-section one-way valve assembly and the single-section one-way valve assembly are respectively limited and installed on the left and right sides of the step surface.

[0009] Preferably, the three-section one-way valve assembly further includes a three-section one-way valve outer ring and a three-section one-way valve inner ring. The three-section one-way valve outer ring is connected to the inner wall of the pulley housing, and the three-section one-way valve inner ring is connected to the left outer wall of the spindle.

[0010] Preferably, a first retainer is provided between the outer ring and the inner ring of the three-section one-way valve. The first retainer has mounting cavities evenly distributed in the circumferential direction. The first one-way needle roller bearing is disposed in the mounting cavity and a first spring plate is provided between it and the inner wall of the mounting cavity.

[0011] Preferably, the outer surface of the inner ring of the three-section one-way valve has a three-step surface, which respectively limits the installation of needle roller bearings on both sides of the three-section one-way valve assembly and the first one-way needle roller bearing in the middle.

[0012] Preferably, the rubber sealing ring is located on the left side of the pulley housing, and the rubber sealing ring is in close contact with the inner wall of the pulley housing and the inner ring of the three-section one-way valve.

[0013] Preferably, the single-stage one-way valve assembly further includes a single-stage one-way valve outer ring and a single-stage one-way valve inner ring. The single-stage one-way valve outer ring is connected to the inner wall of the pulley housing, and the single-stage one-way valve inner ring is connected to the right outer wall of the spindle.

[0014] Preferably, a second retainer is provided between the outer ring and the inner ring of the single-section one-way valve. The second retainer has mounting cavities evenly distributed in the circumferential direction. The second one-way needle roller bearing is disposed in the mounting cavity and a second spring plate is provided between it and the inner wall of the mounting cavity.

[0015] Preferably, the right end of the pulley housing is covered with a dust cover by a snap-fit ​​connection.

[0016] Preferably, the metal sealing ring is located on the right side of the pulley housing, and the metal sealing ring is in contact with the inner wall of the pulley housing and the outer surface of the spindle; a groove is provided on the right end face of the pulley housing, and the dust cover is riveted to the groove during assembly, so that the edge of the groove is deformed, thereby pressing the metal sealing ring and making it in close contact with the outer surface of the spindle.

[0017] Compared with the prior art, the technical solution provided by the present invention has the following advantages: First, the present invention uses two line-contact needle roller bearings, which have a higher load-bearing capacity than the two point-contact ball bearings used in the prior art, thus solving the problem of early failure of pulleys in the front-end gear train of the engine.

[0018] Secondly, the present invention uses a three-section one-way valve assembly that integrates the one-way valve and the needle roller bearing. It has a simple structure, is easy to assemble, has low cost, and has stable and reliable performance.

[0019] Third, the present invention uses the riveting technology of pulley housing and metal sealing ring to achieve axial positioning, which has low process cost and robust and reliable structure. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a high-efficiency heavy-duty double one-way pulley structure according to an embodiment of the present invention; Figure 2 This is a cross-sectional view of the pulley housing in this embodiment; Figure 3 This is a schematic diagram of the three-section one-way transducer assembly in this embodiment; Figure 4 This is a schematic diagram of the single-segment unidirectional converter assembly in this embodiment; Figure 5 This is a cross-sectional view of the mandrel in this embodiment.

[0021] Explanation of markings in the diagram: 10—Pulley housing; 11—Groove; 12—Groove edge; 13—Pulley housing inner wall; 20—Three-section one-way valve assembly; 21—Three-section one-way valve outer ring; 22—Left needle roller bearing; 23—Right needle roller bearing; 24—First one-way needle roller bearing; 25—Three-section one-way valve inner ring; 26—First cage; 27—First spring plate; 30—Single-section one-way valve assembly; 31—Single-section one-way valve outer ring; 32—Single-section one-way valve inner ring; 33—Second one-way needle roller bearing; 34—Second cage; 35—Second spring plate; 40—Spindle; 41—Spindle left outer wall; 42—Spindle right outer wall; 50—Rubber seal; 60—Metal seal; 70—Dust cover. Detailed Implementation

[0022] In the following description, in order to clearly illustrate the structure and operation of the present invention, various directional terms will be used. However, terms such as "front," "rear," "left," "right," "outer," "inner," "outward," "inward," "up," and "down" should be understood as convenient terms and not as limiting terms. Furthermore, the term "inner" as used in the following description primarily refers to the direction closer to the drive shaft; the term "outer" primarily refers to the direction farther from the drive shaft; the term "axial" primarily refers to the direction parallel to the drive shaft; and the term "radial" primarily refers to the direction perpendicular to the drive shaft.

[0023] To better understand the purpose, structure, and function of this invention, the invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0024] like Figure 1 As shown, this embodiment discloses a high-efficiency heavy-duty dual one-way repeater pulley, comprising: The pulley housing 10 has an accommodating space formed on its inner surface.

[0025] The spindle 40 has a drive shaft fixed inside it.

[0026] In the three-section one-way valve assembly 20, the outer ring 21 of the three-section one-way valve is connected to the inner wall 13 of the pulley housing, and the inner ring 25 of the three-section one-way valve is connected to the left outer wall 41 of the spindle. In the single-section one-way valve assembly 30, the outer ring 31 of the single-section one-way valve is connected to the inner wall 13 of the pulley housing, and the inner ring 32 of the single-section one-way valve is connected to the right outer wall 42 of the spindle.

[0027] In one embodiment, the outer wall surface of the spindle 40 is set as a two-step surface, and the three-section one-way valve assembly 20 and the single-section one-way valve assembly 30 are respectively limited and installed on the left and right sides of the step surface, so that the structure of the two assemblies is more stable in the pulley.

[0028] The rubber sealing ring 50 is located on the left side of the pulley housing 10, and the rubber sealing ring 50 is in close contact with the inner wall 13 of the pulley housing and the outer surface of the inner ring 25 of the three-section one-way valve.

[0029] The metal sealing ring 60 is located on the right side of the pulley housing 10, and the metal sealing ring 60 is in contact with the inner wall 13 of the pulley housing and the outer surface of the spindle 40.

[0030] A dust cover 70 is attached to a slot on the outer surface of the right end of the pulley housing 10, thereby covering the right end face of the housing.

[0031] like Figure 2 As shown, a groove 11 is provided on the right end face of the pulley housing 10. During assembly, the groove 11 is riveted to deform the groove edge 12, thereby pressing the metal sealing ring 60 and playing a role in axial positioning of the pulley. This embodiment uses the riveting technology of the pulley housing 10 and the metal sealing ring 60 to achieve axial positioning, which has the advantages of low process cost and robust and reliable structure.

[0032] like Figure 3 As shown, the three-section one-way actuator assembly 20 has a left needle roller bearing 22 and a right needle roller bearing 23 arranged on both sides, which support the pulley housing 10 and the spindle 40. The first one-way needle roller bearing 24, the first cage 26, and the first spring plate 27 in the three-section one-way actuator assembly 20 realize the one-way overrunning function. This part of the structure uses two line-contact needle roller bearings, the left needle roller bearing 22 and the right needle roller bearing 23, which have a higher load-bearing capacity than the two point-contact ball bearings used in the prior art, thus solving the problem of early pulley failure in the front-end pulley system of the engine. Moreover, by integrating the one-way actuator with the needle roller bearings, the structure is simple, the assembly is convenient, the cost is low, and the performance is stable and reliable.

[0033] In one embodiment, the outer surface of the inner ring 25 of the three-section one-way valve is a three-step surface, which respectively limits the installation of needle roller bearings on both sides of the three-section one-way valve assembly 20 and the first one-way needle roller bearing 24 in the middle.

[0034] like Figure 4 As shown, the second one-way needle roller bearing 33, the second cage 34, and the second spring plate 35 in the single-section one-way actuator assembly 30 realize the one-way overtaking function. Furthermore, the parallel arrangement of the second one-way needle roller bearing 33 and the first one-way needle roller bearing 24 significantly increases the load-bearing capacity.

[0035] The three-section one-way pulley assembly 20 and the single-section one-way pulley assembly 30 are arranged side by side to improve the load-bearing capacity, stability and reliability of the pulley, and are particularly suitable for the working conditions of commercial vehicles.

[0036] like Figure 5As shown, the inner ring 25 of the three-section one-way valve is connected to the left outer wall 41 of the spindle, and the inner ring 32 of the single-section one-way valve is connected to the right outer wall 42 of the spindle.

[0037] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A high-efficiency, heavy-duty, double-one-way pulley, comprising: The pulley housing (10) and the spindle (40) disposed therein are characterized in that a three-section one-way valve assembly (20) and a single-section one-way valve assembly (30) are arranged side by side between the inner wall (13) of the pulley housing (10) and the outer wall of the spindle (40) and are sealed by a rubber sealing ring 50 and a metal sealing ring 60. In the three-section one-way actuator assembly (20), needle roller bearings for supporting the pulley housing (10) and spindle (40) are arranged on both sides, and a first one-way needle roller bearing (24) is arranged in the middle; a second one-way needle roller bearing (33) is arranged in the single-section one-way actuator assembly (30). The first one-way needle roller bearing (24) and the second one-way needle roller bearing (33) are used for one-way overrun and load support.

2. The double one-way pulley as described in claim 1, characterized in that, The outer wall of the spindle (40) is a two-step surface, and the three-section one-way device assembly (20) and the single-section one-way device assembly (30) are respectively limited and installed on the left and right sides of the step surface.

3. The double one-way pulley as described in claim 1, characterized in that, The three-section one-way valve assembly (20) also includes a three-section one-way valve outer ring (21) and a three-section one-way valve inner ring (25). The three-section one-way valve outer ring (21) is connected to the inner wall (13) of the pulley housing, and the three-section one-way valve inner ring (25) is connected to the left outer wall (41) of the spindle.

4. The double one-way pulley as described in claim 3, characterized in that, A first retainer (26) is provided between the outer ring (21) and the inner ring (25) of the three-section one-way valve. The first retainer (26) has a uniformly provided mounting cavity in the circumferential direction. The first one-way needle roller bearing (24) is provided in the mounting cavity and a first spring plate (27) is provided between it and the inner wall of the mounting cavity.

5. The double one-way pulley as described in claim 3, characterized in that, The outer surface of the inner ring (25) of the three-section one-way valve is a three-step surface, which respectively limits the installation of needle roller bearings on both sides of the three-section one-way valve assembly (20) and the first one-way needle roller bearing (24) in the middle.

6. The double one-way pulley as described in claim 3, characterized in that, The rubber sealing ring (50) is located on the left side of the pulley housing (10), and the rubber sealing ring (50) is in close contact with the inner wall (13) of the pulley housing and the inner ring (25) of the three-section one-way valve.

7. The double one-way pulley as described in claim 1, characterized in that, The single-stage one-way valve assembly (30) also includes a single-stage one-way valve outer ring (31) and a single-stage one-way valve inner ring (32). The single-stage one-way valve outer ring (31) is connected to the inner wall (13) of the pulley housing, and the single-stage one-way valve inner ring (32) is connected to the right outer wall (42) of the spindle.

8. The double one-way pulley as described in claim 7, characterized in that, A second retainer (34) is provided between the outer ring (31) and the inner ring (32) of the single-section one-way device. The second retainer (34) has a mounting cavity evenly provided in the circumferential direction. The second one-way needle roller bearing (33) is provided in the mounting cavity and a second spring plate (35) is provided between it and the inner wall of the mounting cavity.

9. The double one-way pulley as described in claim 1, characterized in that, The right end of the pulley housing (10) is covered with a dust cover (70) by a snap-fit ​​connection.

10. The double one-way pulley as described in claim 9, characterized in that, The metal sealing ring (60) is located on the right side of the pulley housing (10), and the metal sealing ring (60) is in contact with the inner wall (13) of the pulley housing and the outer surface of the spindle (40); The pulley housing (10) has a groove (11) on the right end face. The dust cover (70) is riveted to the groove (11) during assembly, so that the groove edge (12) is deformed, thereby pressing the metal sealing ring (60) and making it in close contact with the outer surface of the spindle (40).

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