An isolated pulley assembly

Abstract

This invention discloses an isolation pulley assembly, comprising a pulley body and a hub. A radial sliding bearing is pressed inside the pulley body. Between the hub and the pulley body, along the radial direction of the hub, a limiting flange A, a bushing, a soft rubber ring, a limiting flange B, and a hard rubber ring are sequentially arranged. Through rubber vulcanization, the soft rubber ring, bushing, and limiting flange B form a primary shock absorber, while the hard rubber ring, limiting flange B, and pulley body form a secondary shock absorber, constituting a two-stage rubber vibration-damping isolation pulley. The isolation pulley of this invention has the following advantages: it can isolate crankshaft speed fluctuations from engine front-end accessories, thereby effectively reducing torsional vibration of the engine front-end accessories and reducing belt wear, noise, and slippage.

Description

Technical Field

[0001] This invention relates to a pulley, and more specifically, to an isolation pulley. Background Technology

[0002] In automotive powertrains, pulleys are a common power transmission structure, often used in front-end accessories of the engine, such as alternators, air compressors, and water pumps. The engine's crankshaft transmits power to these front-end accessories via belts and pulleys. Existing pulleys are typically a single metal component with almost no vibration damping or noise reduction features. Summary of the Invention

[0003] The present invention mainly addresses the technical problems existing in the prior art, thereby providing an isolation pulley.

[0004] The above-mentioned technical problems of the present invention are mainly solved by the following technical solutions:

[0005] An isolation pulley, characterized in that the isolation pulley comprises a pulley body and a hub, and a radial sliding bearing is pressed inside the pulley body.

[0006] A limiting flange A, a bushing, a soft rubber ring, a limiting flange B, and a hard rubber ring are sequentially arranged along the radial direction of the hub between the hub and the pulley body.

[0007] As a preferred embodiment of the present invention,

[0008] The wheel hub includes an annular wheel hub sidewall and a circular wheel hub end cap. A wheel hub cylinder and a wheel hub rib are located at the center of the wheel hub end cap.

[0009] The pulley body includes an annular outer wheel sidewall and an annular outer wheel end cap. The outer circumference of the outer wheel sidewall is provided with several belt grooves.

[0010] The limiting flange A includes a columnar first limiting flange cylinder. An annular first limiting flange ring is provided on the outer end cover of the first limiting flange cylinder facing the pulley body. U-shaped limiting blocks A are evenly distributed around the circumference of the first limiting flange ring.

[0011] The limiting flange B includes a columnar second limiting flange cylinder. An annular second limiting flange ring is provided on the hub end cover of the second limiting flange cylinder facing the hub. U-shaped limiting blocks B are evenly distributed around the circumference of the second limiting flange ring. The limiting blocks B and the limiting blocks A restrict the torsional displacement of the soft rubber ring through a mechanical mechanism.

[0012] The soft rubber ring comprises an annular outer contour and an annular inner contour.

[0013] The rigid rubber ring includes an annular inner end face and an annular outer end face.

[0014] in,

[0015] The outer contour of the soft rubber ring is bonded to the second limiting flange cylinder of the limiting flange B.

[0016] The inner contour of the soft rubber ring is bonded to the bushing.

[0017] The inner end face of the rigid rubber ring is bonded to the second limiting flange ring disc of the limiting flange B.

[0018] The outer end face of the rigid rubber ring is bonded to the outer wheel end cap of the pulley body.

[0019] As a preferred embodiment of the present invention,

[0020] The hub sidewall of the wheel hub slides relative to the inner diameter of the radial sliding bearing, and the hub rib of the wheel hub is interference-fitted with the inner diameter of the limiting flange A.

[0021] As a preferred embodiment of the present invention,

[0022] Both the rigid rubber ring and the soft rubber ring have trapezoidal cross-sections.

[0023] As a preferred embodiment of the present invention,

[0024] The rigid rubber ring has a greater stiffness than the soft rubber ring.

[0025] As a preferred embodiment of the present invention,

[0026] Both the soft rubber ring and the hard rubber ring are made by rubber vulcanization.

[0027] As a preferred embodiment of the present invention,

[0028] The limiting block A and limiting block B are square in shape.

[0029] The isolation pulley of the present invention has the following advantages: the isolation pulley can isolate the crankshaft speed fluctuations from the engine front-end accessories, thereby effectively reducing the torsional vibration of the engine front-end accessories, and reducing belt wear, noise and slippage. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a three-dimensional structural diagram of the isolation pulley assembly of the present invention;

[0032] Figure 2 for Figure 1 A three-dimensional structural diagram of the isolation pulley assembly, from the main viewpoint;

[0033] Figure 3 for Figure 2 A cross-sectional view of the isolation pulley assembly along line AA;

[0034] Figure 4 for Figure 2 An exploded three-dimensional structural diagram of the isolation pulley assembly in the middle;

[0035] Figure 5 for Figure 4 A cross-sectional structural diagram of the pulley body of the isolation pulley assembly in the diagram;

[0036] Figure 6 for Figure 1 A three-dimensional structural diagram of the isolation pulley assembly, shown from the rear view;

[0037] Figure 7 for Figure 6 A detailed enlarged schematic diagram of area B of the isolation pulley assembly. Detailed Implementation

[0038] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0039] like Figures 1 to 5 As shown, the isolation pulley assembly M includes a pulley body 1 and a hub 8, and a radial sliding bearing 2 is pressed inside the pulley body 1.

[0040] Between the hub 8 and the pulley body 1, a limiting flange A4, a bushing 7, a soft rubber ring 5, a limiting flange B6 and a hard rubber ring 3 are arranged in sequence along the radial direction of the hub 8.

[0041] The hub 8 includes an annular hub sidewall 81 and a circular hub end cap 82. The hub end cap 82 has a hub cylinder 83 and a hub rib 84 at its center.

[0042] The pulley body 1 includes an annular outer wheel sidewall 11 and an annular outer wheel end cap 12. The outer circular contour of the outer wheel sidewall 11 is provided with a plurality of belt grooves 13.

[0043] The limiting flange A4 includes a columnar first limiting flange cylinder 41. An annular first limiting flange ring 42 is provided on the outer wheel end cover 12 facing the pulley body 1 of the first limiting flange cylinder 41. U-shaped limiting blocks A43 are evenly distributed around the circumference of the first limiting flange ring 42.

[0044] The limiting flange B6 includes a columnar second limiting flange cylinder 61. The second limiting flange cylinder 61 has an annular second limiting flange ring 62 on the hub end cover 82 facing the hub 8. U-shaped limiting blocks B63 are evenly distributed around the circumference of the second limiting flange ring 62. The limiting blocks B63 and the limiting blocks A43 restrict the torsional displacement of the soft rubber ring 5 through a mechanical mechanism.

[0045] The soft rubber ring 5 includes an annular outer contour 51 and an annular inner contour 52.

[0046] The rigid rubber ring 3 includes an annular inner end face 31 and an annular outer end face 32.

[0047] The outer contour 51 of the soft rubber ring 5 is bonded to the second limiting flange cylinder 61 of the limiting flange B6, the inner contour 52 of the soft rubber ring 5 is bonded to the bushing 7, and the inner end face 31 of the hard rubber ring 3 is bonded to the second limiting flange ring disc 62 of the limiting flange B6.

[0048] The outer end face 32 of the rigid rubber ring 3 is bonded to the outer wheel end cap 12 of the pulley body 1. It should be noted that this bonding process is completed through a rubber vulcanization process.

[0049] In addition, the hub sidewall 81 of the hub 8 slides relative to the inner diameter of the radial sliding bearing 2, and the hub rib 84 of the hub 8 is interference-fitted with the inner diameter of the limiting flange A4.

[0050] In addition, the limiting block A43 and the limiting block B63 are square.

[0051] like Figure 3 As shown, the cross-sections of both the rigid rubber ring 3 and the soft rubber ring 5 are trapezoidal.

[0052] The rigid rubber ring 3 has a greater stiffness than the soft rubber ring 5, which will be explained further later.

[0053] Through rubber vulcanization, the soft rubber ring 5, bushing 7, and limiting flange B6 form a primary shock absorber. Additionally, the second limiting flange ring 62 on the limiting flange B6 and the outer wheel end cap 12 on the pulley body 1 have corresponding bending angles, and through rubber vulcanization, the hard rubber ring 3, limiting flange B6, and pulley body 1 form another stage of shock absorber.

[0054] The working process of this isolation pulley is explained below.

[0055] The hub cylinder 83 of the hub 8 is connected to an external shaft through a keyway, and the belt groove 13 of the pulley 1 is connected to an external wheel through a belt.

[0056] When the external shaft rotates, the input torque is transmitted sequentially from the hub 8 to the soft rubber ring 5, the limiting flange B6, the hard rubber ring 3, and the pulley body 1.

[0057] In this process, such as Figure 6 and Figure 7 As shown, the limiting block B63 of the limiting flange B6 and the limiting block A43 of the limiting flange A4 restrict the torsional displacement of the soft rubber ring 5 through a mechanical mechanism.

[0058] Because bushing 7 and limiting flange A4 are interference-fitted, and limiting flange A4 and hub 8 are interference-fitted, the soft rubber ring 5 undergoes torsional displacement due to the elastic deformation of the rubber. When the torsional displacement reaches the maximum torsional angle of the rubber, the limiting block B63 of limiting flange B6 restricts the rotation of limiting flange A4, preventing the soft rubber ring 5 from failing due to plastic deformation. After the mechanical limiting structure is activated, the hard rubber ring 3 begins to work. During engine ignition or idling, the crankshaft speed fluctuation is isolated from the front-end accessories after being damped by the secondary rubber system, and the belt drives smoothly.

[0059] The rigid rubber ring 3 is located between the limiting flange B6 and the pulley body 1, which can effectively alleviate axial and longitudinal impacts.

[0060] In practical applications, the external shaft can be the crankshaft of a car engine, while the external pulley can be a front-end accessory of the car engine, such as a generator, air compressor, or water pump. This isolation pulley assembly M can isolate the crankshaft's speed fluctuations from these front-end engine accessories, thereby effectively reducing torsional vibrations of the engine's front-end accessories and decreasing belt wear, noise, and slippage.

[0061] Of course, the external shaft and external wheel can also be used in other power components.

[0062] Not limited to this, any variations or substitutions conceived without inventive effort should be included within the scope of protection of this invention. Therefore, the scope of protection of this invention should be determined by the scope defined in the claims.

Claims

1. An isolated pulley assembly, characterized by, The isolation pulley (M) includes a pulley body (1) and a hub (8), and a radial sliding bearing (2) is pressed inside the pulley body (1). A limiting flange A (4), a bushing (7), a soft rubber ring (5), a limiting flange B (6) and a hard rubber ring (3) are sequentially provided along the radial direction of the hub (8) between the hub (8) and the pulley body (1). The hub (8) includes an annular hub sidewall (81) and a circular hub end cap (82). The hub end cap (82) has a hub cylinder (83) and a hub rib (84) at its center. The pulley body (1) includes an annular outer wheel sidewall (11) and an annular outer wheel end cap (12). The outer circular contour of the outer wheel sidewall (11) is provided with several belt grooves (13). The limiting flange A (4) includes a columnar first limiting flange cylinder (41). The outer wheel end cap (12) of the first limiting flange cylinder (41) facing the pulley body (1) is provided with an annular first limiting flange ring disc (42). U-shaped limiting blocks A (43) are evenly distributed around the circumference of the first limiting flange ring disc (42). The limiting flange B (6) includes a columnar second limiting flange cylinder (61). The second limiting flange cylinder (61) has an annular second limiting flange ring disc (62) on the hub end cover (82) facing the hub (8). U-shaped limiting blocks B (63) are evenly distributed around the circumference of the second limiting flange ring disc (62). The limiting blocks B (63) and the limiting blocks A (43) restrict the torsional displacement of the soft rubber ring (5) through a mechanical mechanism. The soft rubber ring (5) comprises an annular outer contour (51) and an annular inner contour (52). The rigid rubber ring (3) includes an annular inner end face (31) and an annular outer end face (32). in, The outer contour (51) of the soft rubber ring (5) is bonded to the second limiting flange cylinder (61) of the limiting flange B (6). The inner contour (52) of the soft rubber ring (5) is bonded to the bushing (7). The inner end face (31) of the rigid rubber ring (3) is bonded to the second limiting flange ring disc (62) of the limiting flange B (6). The outer end face (32) of the rigid rubber ring (3) is bonded to the outer wheel end cap (12) of the pulley body (1).

2. The isolation pulley assembly according to claim 1, characterized in that, The hub sidewall (81) of the hub (8) slides relative to the inner diameter of the radial sliding bearing (2), and the hub rib (84) of the hub (8) is interference-fitted with the inner diameter of the limiting flange A (4).

3. The isolation pulley assembly according to claim 2, characterized in that, The cross-sections of both the rigid rubber ring (3) and the soft rubber ring (5) are trapezoidal.

4. The isolation pulley assembly according to claim 2, characterized in that, The rigid rubber ring (3) has a greater stiffness than the soft rubber ring (5).

5. The isolation pulley assembly according to claim 2, characterized in that, The soft rubber ring (5) and the hard rubber ring (3) are both made by rubber vulcanization.

6. The isolation pulley assembly according to claim 2, characterized in that, The limiting blocks A (43) and B (63) are square.

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