Silicone oil clutch based on PWM control
The optimized structure of the silicon oil clutch enhances response speed and reduces thermal stress, addressing mechanical lag and extending clutch life.
Patent Information
- Application Number
- CN202510722914.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-30
- Publication Date
- 2025-07-15
AI Technical Summary
The existing PWM-controlled silicone oil clutch has shortcomings in response speed and temperature rise, especially in the case of frequent dynamic load changes, which affect real-time and service life.
By optimizing the structural design of the driven plate and the oil distribution plate, the strong viscosity and shear force of silicone oil are used to speed up the bonding time between the driven plate and the front cover, and the temperature rise problem is reduced by setting a heat sink outside the front cover.
It improves the response speed of the silicone oil clutch, reduces mechanical response lag, extends service life, reduces temperature rise, and improves the ability to transmit torque.
Smart Images
Figure CN120312754A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of electronically controlled silicone oil clutch water pumps, and particularly to a silicone oil clutch based on PWM control. Background Art
[0002] A clutch water pump is a device that can automatically adjust the rotational speed of the water pump impeller according to the working temperature of the engine to control the amount of coolant pumped, which can achieve the effect of precisely cooling the engine and well reduce the power consumption of the engine.
[0003] The working principle of a silicone oil clutch controlled by PWM is that the shear force generated by the silicone oil in the clutch working chamber drives the rotation of the water pump impeller. The amount of silicone oil in the working chamber directly affects the magnitude of the silicone oil shear force, and thus affects the torque that the silicone oil can bear. The main disadvantages of a silicone oil clutch controlled by PWM are: 1) Response delay. On the one hand, PWM control requires a certain amount of time to adjust the duty cycle. On the other hand, the viscosity of the silicone oil itself will cause mechanical response lag, and the superposition of the two will further affect real-time performance, especially in the case of frequent dynamic load changes; 2) Temperature rise problem. The silicone oil will generate heat under high-frequency shearing, and the high-frequency switching of PWM control may exacerbate the temperature rise, which will reduce the viscosity of the silicone oil, and thus affect the torque transmission ability, forming a vicious cycle. High temperature may also accelerate the aging of the silicone oil and shorten the service life. Summary of the Invention
[0004] The technical problem to be solved by the invention is to provide a silicone oil clutch based on PWM control that can improve the response speed.
[0005] To solve the above technical problem, the technical solution of the invention is: A silicone oil clutch based on PWM control, including a housing, a rotating shaft, a pulley, a front cover, and an electromagnetic coil. The rotating shaft is rotatably installed on the housing; The pulley is movably connected to the rotating shaft through a shaft hole. The front cover is fixedly installed on the upper end surface of the pulley and forms a closed cavity with the pulley. A driven plate, an oil distribution plate, and a valve plate are sequentially installed in the cavity from top to bottom; The driven plate is fixedly connected to the rotating shaft. Both the upper surface of the driven plate and the inner side surface of the front cover are provided with multiple concentric annular protrusions. An annular groove is formed between two adjacent annular protrusions. The annular protrusions of the front cover and the annular protrusions of the driven plate are staggered with each other and enter into the annular grooves of each other; A plurality of radial oil discharge grooves are opened on the inner side surface of the front cover corresponding to the positions of the annular protrusions; a plurality of oil discharge holes are opened on the driven plate corresponding to the positions of the annular protrusions. A plurality of oil inlet grooves are opened on the periphery of the driven plate. A ring-shaped oil groove is provided at the position near the outer edge of the lower surface of the driven plate. The lower ends of the plurality of oil inlet grooves are all communicated with the oil groove; The oil distribution disc and the valve plate are both disc structures with a middle through hole. The outer edges of the oil distribution disc and the valve plate are clamped and fixed up and down by the front cover and the outer ring of the pulley. An oil storage groove is formed between the oil distribution disc and the annular disc of the pulley for storing silicone oil. The oil distribution disc is provided with an oil inlet boss, an oil inlet hole, an oil return boss and an oil return hole corresponding to the position of the oil groove of the driven plate; the valve plate includes an elastic piece, an armature, an oil inlet baffle and an oil return baffle fixed on the elastic piece. The oil inlet baffle and the oil return baffle are staggered by a certain angle and have a height difference.
[0006] The working principle of the above technical solution is as follows: When the pulley drives the front cover to rotate and the oil inlet baffle does not cover the oil inlet hole, under the action of centrifugal force, the silicone oil in the oil storage cavity can sequentially pass through the oil inlet hole, the oil groove and the oil inlet groove into the annular groove between the driven plate and the front cover. The strong viscosity and shear force of the silicone oil can combine the driven plate and the front cover together, so that the front cover drives the driven plate to rotate, and the driven plate then drives the rotating shaft to rotate. The invention can squeeze the silicone oil coming in from the oil inlet hole by matching the oil groove on the lower surface of the driven plate with the oil inlet boss of the oil distribution disc, so that the silicone oil quickly enters the annular groove between the driven plate and the front cover along the oil inlet groove on the periphery of the driven plate under the dual action of the extrusion force and the centrifugal force, accelerating the combination time of the driven plate and the front cover. When oil needs to be returned, the oil return boss can squeeze the silicone oil in the oil groove, increasing the silicone oil pressure at the oil return hole and increasing the pressure difference at both ends of the oil return hole, so that the silicone oil quickly flows back to the storage cavity, reducing the silicone oil return time, and thus accelerating the separation time of the silicone oil clutch. The invention optimizes the structures of the driven plate and the oil distribution disc, improves the response speed of the silicone oil clutch, and thus can offset the mechanical response lag problem caused by the viscosity of the silicone oil itself to a certain extent.
[0007] In one embodiment, the pulley includes an outer ring and an inner ring with a shaft hole. The outer ring and the inner ring are connected by an annular disc. The pulley is movably connected to the rotating shaft through the shaft hole of the inner ring. The front cover is fixedly installed on the upper end surface of the outer ring of the pulley by screws. The outer side surface of the front cover is provided with heat dissipation fins; a closed cavity is formed between the front cover and the pulley. A driven plate, an oil distribution disc and a valve plate are sequentially installed in the cavity from top to bottom. An electromagnetic coil is installed on the lower surface of the annular disc of the pulley. This technical solution can weaken the temperature rise problem of the silicone oil clutch to a certain extent by providing heat dissipation fins on the outer side surface of the front cover, avoiding reducing the viscosity of the silicone oil and accelerating the aging of the silicone oil due to high temperature.
[0008] In one embodiment, the oil discharge holes on the driven plate are all strip-shaped holes and all intersect with multiple annular grooves.
[0009] In one embodiment, the oil discharge holes are divided into two groups, with three in each group. One group is radial oil discharge holes, and the other group is oblique oil discharge holes. Each oblique oil discharge hole is parallel to the nearest radial oil discharge hole; a plurality of oil inlet grooves inclined to the right are provided on the periphery of the driven plate.
[0010] Further, a pressure balance groove is provided on the upper surface of the driven plate for communicating the radial oil discharge hole with the periphery of the driven plate.
[0011] Further, two exhaust holes are also provided on the driven plate. This can keep the pressure above and below the driven plate balanced.
[0012] Further, a magnetic isolation ring is welded at the position of the annular disc of the pulley corresponding to the electromagnetic coil.
[0013] Further, the magnetic isolation ring is made of stainless steel, and a groove is provided on the lower surface of the magnetic isolation ring. The groove provided on the magnetic isolation ring can reduce the weight, accelerate heat dissipation during welding, and position during welding.
[0014] In one embodiment, an annular oil inlet end face protrudes at the position of the upper end face of the oil distribution disc corresponding to the oil inlet hole, and an annular oil return end face protrudes at the position of the lower end face of the oil distribution disc corresponding to the oil return hole. The oil inlet baffle passes upward through the middle through hole of the oil distribution disc and then bends horizontally above the oil distribution disc and aligns with the oil inlet hole, while the oil return baffle is located below the oil distribution disc and aligns with the oil return hole; when the electromagnetic coil is energized, under the action of the electromagnetic force of the electromagnetic coil, the valve plate moves downward, driving the oil inlet baffle to tightly adhere to the oil inlet end face downward to cover the oil inlet hole, and the oil return baffle does not contact the oil return end face of the oil distribution disc; when the electromagnetic coil is de-energized, under the action of the elastic force of the elastic piece, the entire valve plate moves upward, driving the oil return baffle to tightly adhere to the oil return end face upward to cover the oil return hole, and the oil inlet baffle does not contact the oil inlet end face of the oil distribution disc. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a schematic cross-sectional structure diagram of the silicone oil clutch in the embodiment of the invention; Figure 2 It is a schematic structure diagram of the pulley in the embodiment of the invention; Figure 3 It is a schematic structure diagram of the front cover in the embodiment of the invention; Figure 4 It is a schematic structure diagram of the upper surface of the driven plate in the embodiment of the invention; Figure 5 It is a schematic structure diagram of the lower surface of the driven plate in the embodiment of the invention; Figure 6 It is a schematic structure diagram of the upper surface of the oil distribution disc in the embodiment of the invention; Figure 7 It is a schematic structure diagram of the lower surface of the oil distribution disc in the embodiment of the invention; Figure 8 It is a schematic structure diagram of the upper surface of the valve plate in the embodiment of the invention; Figure 9 It is a schematic structure diagram of the lower surface of the valve plate in the embodiment of the invention; The reference numerals are as follows: 10. housing; 20. rotating shaft; 30. pulley; 31. outer ring, 32. inner ring, 33. magnetic isolation ring, 40. front cover; 41. oil drain groove; 50. driven plate; 51. radial oil drain hole; 52. inclined oil drain hole; 53. oil inlet groove; 54. oil retaining groove; 55. vent hole; 56. pressure balance groove; 60. oil distribution plate; 61. oil inlet boss; 62. oil inlet hole; 63. oil return boss; 64. oil return hole; 70. valve plate; 71. shrapnel; 72. armature; 73. oil inlet baffle; 74. oil return baffle; 80. electromagnetic coil. Detailed implementation manners
[0016] For the convenience of understanding by those skilled in the art, the invention will be further described below in conjunction with the embodiments and the drawings. The content mentioned in the implementation manners does not limit the invention.
[0017] It should be noted in advance that in the invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. For those of ordinary skill in the art, the specific meanings of the above terms in the invention can be understood according to specific situations.
[0018] As Figures 1 to 9As shown in the figure, a silicone oil clutch based on PWM control includes a housing 10, a rotating shaft 20, a pulley 30, a front cover 40, a driven plate 50, an oil distribution disc 60, and a valve plate 70. The rotating shaft 20 is rotatably installed on the housing 10. The pulley 30 includes an outer ring 31 and an inner ring 32 with a shaft hole. The outer ring 31 and the inner ring 32 are connected by an annular disc. The pulley 30 is movably connected to the rotating shaft 20 through the shaft hole of the inner ring 32. The front cover 40 is fixedly installed on the upper end surface of the outer ring 31 of the pulley 30 by screws. The outer side surface of the front cover 40 is provided with heat dissipation fins. A closed cavity is formed between the front cover 40 and the pulley 30. Inside this cavity, a driven plate 50, an oil distribution disc 60, and a valve plate are installed in sequence from top to bottom. An electromagnetic coil 80 is installed on the lower surface of the annular disc of the pulley 30. A stainless steel magnetic isolation ring 33 is welded at the position of the annular disc of the pulley 30 corresponding to the electromagnetic coil. A groove is provided on the lower surface of the magnetic isolation ring 33. The driven plate 50 is fixedly connected to the rotating shaft 20. Multiple concentric annular protrusions are provided on the upper surface of the driven plate 50 and the inner side surface of the front cover 40. Annular grooves are formed between adjacent two annular protrusions. The annular protrusions of the front cover 40 and the annular protrusions of the driven plate 50 are staggered with each other and enter into the annular grooves of each other. Multiple radial oil discharge grooves 41 are provided on the inner side surface of the front cover 40 corresponding to the annular protrusions. Multiple oil discharge holes are provided at the positions of the driven plate 50 corresponding to the annular protrusions. Multiple oil inlet grooves 53 that incline to the right are provided on the periphery of the driven plate 50. An oil trough 54 is provided on the lower surface of the driven plate 50 near the outer edge. The lower ends of the oil inlet grooves 53 are all communicated with the oil trough 54. Both the oil distribution disc 60 and the valve plate are disc structures with a central through hole. The outer edges of the oil distribution disc 60 and the valve plate are clamped and fixed by the front cover 40 and the outer ring 31 of the pulley 30 from above and below. An oil storage tank is formed between the oil distribution disc 60 and the annular disc of the pulley 30 for storing silicone oil. An oil inlet boss 61, an oil inlet hole 62, an oil return boss 63, and an oil return hole 64 are provided on the oil distribution disc 60 corresponding to the oil trough 54 of the driven plate 50. The valve plate 70 includes a spring piece 71, an armature 72, an oil inlet baffle 73, and an oil return baffle 74 fixed on the spring piece 71. The oil inlet baffle 73 and the oil return baffle 74 are staggered by a certain angle and have a height difference.
[0019] As Figure 4 , 5 shown in the figure, the oil discharge holes on the driven plate 50 are all strip-shaped holes and all intersect with multiple annular grooves. The oil discharge holes are divided into two groups, with three in each group. One group is radial oil discharge holes 51, and the other group is oblique oil discharge holes 52. Each oblique oil discharge hole 52 is parallel to the nearest radial oil discharge hole 51. A pressure balance groove 56 is provided on the upper surface of the driven plate 50 to communicate the radial oil discharge holes 51 with the periphery of the driven plate 50. Two exhaust holes are also provided on the driven plate 50, so that the pressure above and below the driven plate 50 can be kept balanced.
[0020] As Figures 6 to 9As shown in the figure, an annular oil inlet end face protrudes at the position of the upper end face of the oil distribution disc 60 corresponding to the oil inlet hole 62, and an annular oil return end face protrudes at the position of the lower end face of the oil distribution disc 60 corresponding to the oil return hole 64. The oil inlet baffle 73 passes upward through the middle through hole of the oil distribution disc 60 and then bends horizontally above the oil distribution disc 60 and aligns with the oil inlet hole 62, while the oil return baffle 74 is located below the oil distribution disc 60 and aligns with the oil return hole 64. When the electromagnetic coil 80 is energized, under the action of the electromagnetic force of the electromagnetic coil 80, the valve plate 70 moves downward, driving the oil inlet baffle 73 to closely adhere to the oil inlet end face downward to cover the oil inlet hole 62, and the oil return baffle 74 does not contact the oil return end face of the oil distribution disc 60. When the electromagnetic coil 80 is de-energized, under the elastic force of the elastic piece 71, the entire valve plate 70 moves upward, driving the oil return baffle 74 to closely adhere to the oil return end face upward to cover the oil return hole 64, and the oil inlet baffle 73 does not contact the oil inlet end face of the oil distribution disc 60.
[0021] The working principle of this embodiment is as follows: When the pulley 30 drives the front cover 40 to rotate and the oil inlet baffle does not cover the oil inlet hole 62, under the action of centrifugal force, the silicone oil in the oil storage cavity can sequentially pass through the oil inlet hole 62, the oil groove 54, and the oil inlet groove 53 and enter the annular grooves of the driven plate 50 and the front cover 40. The strong viscosity and shear force of the silicone oil can combine the driven plate 50 and the front cover 40 together, enabling the front cover 40 to drive the driven plate 50 to rotate, and the driven plate 50 further drives the rotating shaft 20 to rotate. The invention cooperates the oil groove 54 on the lower surface of the driven plate 50 with the oil inlet boss 61 of the oil distribution disc 60, which can extrude the silicone oil entering from the oil inlet hole 62, so that the silicone oil quickly enters the annular grooves of the driven plate 50 and the front cover 40 along the oil inlet groove 53 on the periphery of the driven plate 50 under the dual action of the extrusion force and centrifugal force, accelerating the combination time of the driven plate 50 and the front cover 40. When oil return is required, the oil return boss 63 can extrude the silicone oil in the oil groove 54, which can increase the silicone oil pressure at the oil return hole 64, increase the pressure difference at both ends of the oil return hole 64, enable the silicone oil to quickly flow back to the storage cavity, reduce the silicone oil return time, and thus accelerate the separation time of the silicone oil clutch.
[0022] To make it more convenient for those of ordinary skill in the art to understand the improvements of the invention over the prior art, some drawings and descriptions of the invention have been simplified, and the above embodiments are the preferred implementation solutions of the invention. In addition, the invention can be implemented in other ways. Any obvious substitution without departing from the concept of the technical solution of the invention is within the protection scope of the invention.
Claims
1. A silicone oil clutch based on PWM control, characterized in that: It includes a housing (10), a rotating shaft (20), a pulley (30), a front cover (40), and an electromagnetic coil. The rotating shaft (20) is rotatably installed on the housing (10); The pulley (30) is movably connected to the rotating shaft (20) through a shaft hole. The front cover (40) is fixedly installed on the upper end surface of the pulley (30) and forms a closed cavity with the pulley (30). A driven plate (50), an oil distribution disk (60), and a valve plate are sequentially installed in this cavity from top to bottom; The driven plate (50) is fixedly connected to the rotating shaft (20). Multiple concentric annular protrusions are provided on the upper surface of the driven plate (50) and the inner side surface of the front cover (40). An annular groove is formed between adjacent two annular protrusions. The annular protrusions of the front cover (40) and the driven plate (50) are staggered with each other and enter into the annular grooves of each other; Multiple radial oil discharge grooves (41) are provided on the inner side surface of the front cover (40) corresponding to the positions of the annular protrusions; multiple oil discharge holes are provided on the driven plate (50) corresponding to the positions of the annular protrusions. Multiple oil inlet grooves (53) are provided on the periphery of the driven plate (50). A circumferential oil trough (54) is provided on the lower surface of the driven plate (50) near the outer edge. The lower ends of multiple oil inlet grooves (53) are communicated with the oil trough (54); Both the oil distribution disk (60) and the valve plate are disk structures with a central through hole. The outer edges of the oil distribution disk (60) and the valve plate are clamped and fixed by the front cover (40) and the outer ring (31) of the pulley (30) from top and bottom. An oil storage groove is formed between the oil distribution disk (60) and the annular disk of the pulley (30) for storing silicone oil. The oil distribution disk (60) is provided with an oil inlet boss (61), an oil inlet hole (62), an oil return boss (63), and an oil return hole (64) corresponding to the position of the oil trough (54) of the driven plate (50); The valve plate (70) includes a spring plate (71), an armature (72), an oil inlet baffle (73), and an oil return baffle (74).
2. The silicone oil clutch based on PWM control according to claim 1, wherein: The pulley (30) includes an outer ring (31) and an inner ring (32) with a shaft hole. The outer ring (31) and the inner ring (32) are connected by an annular disk. The pulley (30) is movably connected to the rotating shaft (20) through the shaft hole of the inner ring (32). The front cover (40) is fixedly installed on the upper end surface of the outer ring (31) of the pulley (30) by screws. Heat dissipation fins are provided on the outer side surface of the front cover (40); A closed cavity is formed between the front cover (40) and the pulley (30). A driven plate (50), an oil distribution disk (60), and a valve plate are sequentially installed in this cavity from top to bottom. An electromagnetic coil is installed on the lower surface of the annular disk of the pulley (30).
3. The silicone oil clutch based on PWM control according to claim 1 or 2, characterized in that: The oil discharge holes on the driven plate (50) are all strip-shaped holes and all intersect with multiple annular grooves.
4. The silicone oil clutch based on PWM control according to claim 3, wherein: The oil discharge holes are divided into two groups, with three in each group. One group is radial oil discharge holes (51), and the other group is oblique oil discharge holes (52). Each oblique oil discharge hole (52) is parallel to the nearest radial oil discharge hole (51); Multiple right-angled inclined oil inlet grooves (53) are provided on the periphery of the driven plate (50).
5. The silicone oil clutch based on PWM control according to claim 4, wherein: The upper surface of the driven plate (50) is provided with a pressure balance groove (56) for communicating the radial oil drain hole (51) with the periphery of the driven plate (50).
6. The silicone oil clutch based on PWM control according to claim 3, wherein: Two exhaust holes are also provided on the driven plate (50).
7. The PWM control-based silicone oil clutch according to any one of claims 2 to 6, characterized in that: A magnetic isolation ring (33) is welded at the position of the annular disc of the pulley (30) corresponding to the electromagnetic coil (80).
8. The silicone oil clutch based on PWM control according to claim 7, wherein: The magnetic isolation ring (33) is made of stainless steel, and a circle of grooves is provided on the lower surface of the magnetic isolation ring (33).
9. The silicone oil clutch based on PWM control according to any one of claims 2 to 6, characterized in that: At the position corresponding to the oil inlet hole (62) on the upper end face of the oil distribution disc (60), an annular oil inlet end face protrudes. At the position corresponding to the oil return hole (64) on the lower end face of the oil distribution disc (60), an annular oil return end face protrudes. The oil inlet baffle (73) passes upward through the middle through hole of the oil distribution disc (60) and then bends horizontally above the oil distribution disc (60) and aligns with the oil inlet hole (62). The oil return baffle (74) is located below the oil distribution disc (60) and aligns with the oil return hole (64). When the electromagnetic coil (80) is energized, under the action of the electromagnetic force of the electromagnetic coil (80), the valve plate (70) moves downward, driving the oil inlet baffle (73) to tightly adhere to the oil inlet end face downward to cover the oil inlet hole (62), and the oil return baffle (74) does not contact the oil return end face of the oil distribution disc (60). When the electromagnetic coil (80) is de-energized, under the elastic force of the elastic piece (71), the entire valve plate (70) moves upward, driving the oil return baffle (74) to tightly adhere to the oil return end face upward to cover the oil return hole (64), and the oil inlet baffle (73) does not contact the oil inlet end face of the oil distribution disc (60).