Electrically-controlled silicone oil clutch assembly with normally-open valve

Abstract

The utility model relates to the technical field of silicone oil clutches, in particular to a valve normally-open electric control silicone oil clutch assembly which comprises a driving shaft, a solenoid, a check ring, a shell, a wave spring washer, a flat washer, a driving wheel plate and a front cover. The driving shaft sequentially penetrates through the solenoid, the check ring, a bearing arranged on the shell, a wave spring washer and a flat washer and is fixedly connected with the driving wheel plate in the axial direction. A first labyrinth groove and a second labyrinth groove in the end faces of the two sides of the driving wheel plate are in clearance fit with a front cover labyrinth groove in the inner surface of the front cover and a shell labyrinth groove in the inner surface of the shell respectively to form a working cavity. An oil storage cavity in the driving wheel plate is communicated with the working cavity; and a valve assembly and a backflow mechanism are arranged on the driving wheel plate. The valve assembly adopts a normally open mode, when a solenoid fails or a circuit is powered off, silicone oil can still enter the working cavity to drive the fan to operate, an engine is prevented from being overheated, and high safety redundancy is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of silicone oil clutch, especially relates to a valve always open electric control silicone oil clutch assembly. BACKGROUND

[0002] The electric control silicone oil fan clutch is a key component in the cooling system of a vehicle engine, and belongs to a kind of hydraulic coupler. Its basic principle is to use high-viscosity silicone oil as transmission medium, and to transmit torque by controlling the circulation of silicone oil between the oil storage cavity and the working cavity, so as to realize the engagement and separation of the engine cooling fan. The device can dynamically adjust the fan speed according to the actual thermal condition of the engine, has the advantages of flexible transmission, impact reduction, torsional vibration isolation, etc., and has important significance for reducing fan power consumption, reducing operating noise, preventing engine overcooling or overheating, and saving energy.

[0003] In the prior art, a typical electric control silicone oil clutch generally includes a driving shaft, a housing, a driving wheel plate, a front cover and a valve assembly controlled by a solenoid valve. Its working process generally receives a water temperature sensor signal by an engine control unit (ECU), and outputs a pulse width modulation (PWM) voltage to a solenoid to drive the valve to act, thereby accurately controlling the amount of silicone oil entering the working cavity, and finally realizing the adjustment of the fan speed.

[0004] However, the existing electric control silicone oil clutch assembly still has some defects to be improved in design and application. First, many existing products adopt a valve always closed design mode. In this mode, when the solenoid fails (such as coil burning) or the vehicle circuit system fails to power off, the valve will always remain closed, preventing silicone oil from entering the working cavity. This will result in the fan being unable to be driven, the engine losing necessary auxiliary cooling, and a major safety hazard of causing engine overheating, and insufficient safety redundancy.

[0005] Secondly, in the silicone oil return link, the oil return efficiency of some designs is not high, or it relies on the oil scraping structure which is easy to produce wear debris. These debris may contaminate the silicone oil, affecting the stability and life of the clutch. In addition, unreasonable magnetic circuit design may cause the valve to act slowly and respond slowly, affecting the accuracy of control; and poor sealing performance may cause silicone oil leakage or external contaminants to enter, reducing product reliability.

[0006] Therefore, there is an urgent need in the art for an improved electric control silicone oil clutch assembly that can ensure the fan continues to run when the electromagnetic control system fails, providing basic safety protection; at the same time, it also needs to have high-efficiency and reliable silicone oil return capability, a responsive and accurate valve control mechanism, and excellent sealing performance. SUMMARY

[0007] The utility model discloses a valve always opens electric control silicon oil clutch assembly, valve subassembly adopts always open mode, when solenoid fails or circuit power off, silicon oil still can enter the working cavity and drive fan operation, prevent engine overheating, possess the high security redundancy.

[0008] In order to realize the utility model's purpose, the utility model adopts the technical scheme: the utility model discloses a valve always opens electric control silicon oil clutch assembly, including driving shaft, solenoid, baffle ring, shell, wave spring washer, flat washer, driving wheel board and front cover, the driving shaft is sequentially threaded the solenoid, baffle ring, the bearing of setting on the shell, wave spring washer and flat washer, and with the axial fixed connection of driving wheel board, the shell and the front cover butt joint inner wall between form the cavity for containing driving wheel board, the both sides end face of driving wheel board is provided with first labyrinth groove and second labyrinth groove respectively, first labyrinth groove, second labyrinth groove are respectively with the front cover labyrinth groove of front cover inner surface, the clearance cooperation of shell inner surface's shell labyrinth groove forms working cavity, the inside of driving wheel board is equipped with annular oil storage cavity, the middle part of oil storage cavity is surrounded by oil retaining ring and forms oil retaining groove, one end of oil retaining groove is closed, and the other end is communicated with oil storage cavity, the side wall on the closed end of oil retaining groove is provided with the oil outlet hole communicated with working cavity along the radial, be equipped with the valve subassembly for opening and closing oil outlet hole on driving wheel board, when solenoid is not electrified, the clearance is equipped between valve subassembly and oil outlet hole, still be provided with backflow mechanism on driving wheel board.

[0009] The backflow mechanism includes an oil scraping block, an oil blocking block, an oil return channel, and an oil return hole, the oil scraping block is arranged on the circumferential side wall of the driving wheel board, an oil return port is arranged on the outer wall of the oil scraping block, and the outer wall of the oil scraping block is in close contact with the circumferential inner wall of the front cover, a gap is arranged between the outer wall of the oil blocking block and the circumferential inner wall of the front cover, the oil return channel is arranged in the driving wheel board, one end of the oil return channel is communicated with the oil return port, and the other end is communicated with the closed end of the annular oil retaining groove through the oil return hole.

[0010] The outer side of the valve subassembly mounting groove is provided with the oil storage cavity, and the outer ends of the oil storage cavity and the oil retaining groove are closed by the oil storage cover plate, and the valve subassembly mounting groove is annularly arranged with three circular holes for fixing the driving wheel board.

[0011] The valve assembly comprises a valve seat, a spring sheet and a valve, the valve is elastically connected to the valve seat through the spring sheet, the spring sheet is fixed on the valve and the valve seat through a rivet head, the valve is in a ring structure, an oil outlet hole baffle is arranged at an end of the valve away from the spring sheet, the valve seat is fixed in a valve assembly mounting groove away from the oil outlet hole, an end of the valve assembly mounting groove close to the oil outlet hole is provided with a baffle hole for the oil outlet hole baffle to pass through, and the spring sheet has a gap between the oil outlet hole baffle and the oil outlet hole in a natural state.

[0012] The shell is in a ring structure, is axially and sealingly connected with the driving shaft through the bearing, the middle part of the outer wall of the shell is in a ring array and is provided with a plurality of sensing gear rings, the outer edge of the outer wall of the shell is in a ring array and is provided with a plurality of fan mounting screw holes, the middle part of the inner wall of the shell is provided with the shell labyrinth groove, the outer edge of the shell is provided with a shell boss for being connected with the front cover, and the axial side wall of the shell is provided with a notch for being mounted and positioned with the front cover.

[0013] The circumferential side wall of the front cover is provided with a positioning groove matched with the notch, the middle part of the inner wall of the front cover is provided with a front cover labyrinth groove, the outer edge of the inner wall of the front cover is provided with a front cover inner hole, and the front cover inner hole is tightly matched with the shell boss through a rectangular sealing ring.

[0014] The circumferential side walls of the front cover and the shell are in a ring array and are provided with a plurality of ear plates, and the ear plates are connected through toothed bolts with hexagonal flange faces.

[0015] The solenoid is fixedly connected with an external engine, is internally provided with a coil and a Hall sensor mounted on a PCB, the Hall sensor is opposite to the sensing gear ring arranged on the shell and is used for detecting the rotating speed of the shell, when the coil of the solenoid is electrified, an annular magnetic circuit is formed, the magnetic circuit sequentially passes through the magnetic core of the solenoid, the driving shaft, the blocking ring, the inner ring of the bearing, the wave spring washer, the flat washer, the oil outlet hole baffle and the sensing gear ring and returns to the magnetic core of the solenoid.

[0016] The utility model discloses the beneficial effect lies in:

[0017] (1) the utility model discloses valve assembly adopts normal open mode, when solenoid failure or circuit power failure, silicon oil still can enter the working cavity drive fan operation, prevent engine overheating, possess the height's safety redundancy;

[0018] (2) The utility model discloses a scraping oil block, oil blocking block and oil blocking groove of the backflow mechanism cooperate under the action of centrifugal force, and silicon oil in the working cavity can be rapidly rethreaded into the working cavity through the oil outlet hole, oil return port and oil return channel, simultaneously, the oil blocking groove can effectively prevent the silicon oil in the oil storage cavity from flowing back to the working cavity when parking, ensure that the fan is in the disengaged state during cold start, and reduce starting noise and oil consumption.

[0019] (3) When the coil of the solenoid is electrified, a ring-shaped magnetic circuit is formed, which sequentially passes through the magnetic core of the solenoid, the driving shaft, the blocking ring, the inner ring of the bearing, the wave spring washer, the flat washer, the oil outlet hole baffle and the induction gear ring, and returns to the magnetic core of the solenoid. The magnetic field can attract the valve to move downward, the oil outlet hole baffle at the end of the valve closes the oil outlet hole, the magnetic field is stable and concentrated, and it is ensured that the valve can rapidly and accurately respond to the on-off electric signal of the solenoid.

[0020] (4) The bearing adopts a double-sided sealing bearing, the rectangular sealing ring is tightly matched between the shell and the front cover, and double sealing ensures that the silicon oil leakage and the invasion of external water vapor and dirt are effectively prevented. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the assembly schematic view of the electric control silicon oil clutch assembly of the utility model valve always open.

[0022] Figure 2 It is the silicon oil return oil path schematic view of the electric control silicon oil clutch assembly of the utility model valve always open.

[0023] Figure 3 It is the shell outer wall schematic view of the electric control silicon oil clutch assembly of the utility model valve always open.

[0024] Figure 4 It is Figure 3 It is the section view along A-A.

[0025] Figure 5 It is the shell inner wall schematic view of the electric control silicon oil clutch assembly of the utility model valve always open.

[0026] Figure 6 It is the driving wheel plate front cover surface schematic view of the electric control silicon oil clutch assembly of the utility model valve always open.

[0027] Figure 7 It is the driving wheel plate shell surface schematic view of the electric control silicon oil clutch assembly of the utility model valve always open.

[0028] Figure 8 It is Figure 7 It is the section view along A-A.

[0029] Figure 9 It is the front cover inner wall structure schematic view of the utility model valve always open electric control silicon oil clutch assembly;

[0030] Figure 10 It is the valve assembly structure schematic view of the utility model valve always open electric control silicon oil clutch assembly.

[0031] In the drawing, 1 is front cover, 2 is driving wheel plate, 3 is shell, 4 is solenoid, 5 is driving shaft, 6 is baffle ring, 7 is wave spring washer, 8 is flat washer, 9 is rectangular sealing ring, 10 is hexagonal flange face toothed bolt;101 is positioning groove, 102 is front cover inner hole, 103 is front cover labyrinth groove;201 is oil scraping block, 202 is oil return port, 203 is oil outlet hole, 204 is oil blocking block, 205 is first labyrinth groove, 206 is round hole, 207 is second labyrinth groove, 208 is valve assembly, 209 is oil storage cover plate, 210 is oil return channel, 211 is oil return hole, 212 is oil storage cavity, 213 is oil blocking groove, 214 is oil blocking ring;20801 is valve seat, 20802 is spring piece, 20803 is valve, 20804 is rivet head, 20805 is oil outlet hole baffle;301 is notch, 302 is induction tooth ring, 303 is bearing, 304 is fan mounting screw hole, 305 is shell labyrinth groove, 306 is shell boss. DETAILED DESCRIPTION

[0032] The utility model is further explained as follows:

[0033] Please refer to Figures 1-10 ,

[0034] The utility model discloses a valve always open electric control silicon oil clutch assembly, such as Figure 1As shown, the driving wheel plate 2 is internally provided with an annular oil storage cavity 212, the middle part of the oil storage cavity 212 is surrounded by a semicircular annular oil retaining ring 214 to form an oil retaining groove 213, one end of the oil retaining groove 213 is closed, the other end is communicated with the oil storage cavity 212, and the oil retaining groove 213 is radially provided with an oil outlet hole 203 communicated with the working cavity on the side wall of the closed end; the driving wheel plate 2 is provided with a valve assembly 208 for opening and closing the oil outlet hole 203, when the solenoid 4 is not electrified, a gap is arranged between the valve assembly 208 and the oil outlet hole 203; the driving wheel plate 2 is further provided with a backflow mechanism, the valve assembly 208 of the utility model adopts a normally open mode, when the solenoid 4 fails or the circuit is powered off, the silicone oil can still enter the working cavity to drive the fan to rotate, so that the engine overheating is prevented, and a high safety redundancy is achieved; the gaps between the first labyrinth groove 205 and the second labyrinth groove 207 and the front cover labyrinth groove 103 on the inner surface of the front cover 1 and the shell labyrinth groove 305 on the inner surface of the shell 3 are uniform, so that the scratching is effectively prevented, and the generation of debris to contaminate the silicone oil is avoided. In the embodiment, the first labyrinth groove 205 and the second labyrinth groove 207 are both 11; the rib width is 1-1.5 mm, the groove width is 1-1.5 mm, and the groove depth is 4-5 mm; three wide 6 mm inclined oil grooves divide the labyrinth groove into three equal parts.

[0035] Further, as Figure 2 , Figure 7 and Figure 8As shown, the backflow mechanism includes an oil scraping block 201, an oil blocking block 204, an oil return channel 210 and an oil return hole 211. The oil scraping block 201 is arranged on the circumferential side wall of the driving wheel plate 2. An oil return port 202 is arranged on the outer wall of the oil scraping block 201. The outer wall of the oil scraping block 201 is in close contact with the circumferential inner wall of the front cover 1. A gap is arranged between the outer wall of the oil blocking block 204 and the circumferential inner wall of the front cover 1. The oil return channel 210 is arranged inside the driving wheel plate 2. One end of the oil return channel 210 is in communication with the oil return port 202. The other end is in communication with the closed end of the annular oil blocking groove 213 through the oil return hole 211. The outer wall of the oil scraping block 201 is in close contact with the circumferential inner wall of the front cover 1. The silicone oil moving to the edge of the working chamber under the centrifugal force can be collected through the oil return port 202. The silicone oil can flow to the oil return port 202 on the oil scraping block 201 through the blocking of the oil blocking block 204. The silicone oil return efficiency is improved. In the case of the valve being always open, the silicone oil in the oil return hole 211 directly flows into the oil outlet hole 203 into the working chamber, greatly reducing the silicone oil flow path. Through the cooperation of the oil scraping block 201, the oil blocking block 204 and the oil blocking groove 213 of the backflow mechanism, the silicone oil in the working chamber can be quickly squeezed into the oil blocking groove 213 through the oil return port 202, the oil return channel 210 and the oil return hole 211 under the action of the centrifugal force. When the valve assembly 208 closes the oil outlet hole 203, the silicone oil is returned to the oil storage chamber 212 through the siphon phenomenon generated during operation. At the same time, the oil blocking groove 213 can effectively prevent the silicone oil from flowing back to the working chamber when the vehicle is stopped. The fan is in a disengaged state during cold start, reducing the starting noise and oil consumption. In addition, the driving wheel plate 2 in the embodiment is made of die-cast aluminum alloy ADC12. The oil scraping block 201 and the oil blocking block 204 on the driving wheel plate 2 are integrally formed with the body.

[0036] Further, as shown in Figure 6 , Figure 7 and Figure 8 , the driving wheel plate 2 is arranged with a valve assembly mounting groove in the annular shape for mounting the valve assembly 208. The oil storage chamber 212 is arranged outside the valve assembly mounting groove. The outer end of the oil storage chamber 212 and the oil blocking groove 213 is closed by the oil storage cover plate 209. The valve assembly mounting groove is arranged with three circular holes 206 in the annular array for fixing the driving wheel plate 2. The circular hole 206 is used for tightening and fixing the driving wheel plate 2. The oil storage cover plate 209 is punched by cold-rolled plate ST12. The oil storage cover plate 209 is fixed on the driving wheel plate 2 by flanging and riveting process.

[0037] Further, as shown in Figure 1 , Figure 7 and Figure 10As shown, the valve assembly 208 includes a valve seat 20801, a spring plate 20802, and a valve 20803. The valve 20803 is elastically connected to the valve seat 20801 via the spring plate 20802. The valve 20803 has an annular structure, and an oil outlet baffle 20805 is provided at its end away from the spring plate 20802. The valve seat 20801 is fixed in the valve assembly mounting groove at one end away from the oil outlet 203. The valve assembly mounting groove is located near the oil outlet 203. One end is provided with a baffle hole for the oil outlet baffle 20805 to pass through. The oil outlet baffle 20805 can pass through the baffle hole to close the oil outlet 203. In its natural state, the spring plate 20802 creates a gap between the oil outlet baffle 20805 and the oil outlet 203. The spring plate 20802 is fixed to the valve 20803 and the valve seat 20801 by the rivet head 20804. The valve 20803 is normally open. In the event of solenoid failure, the fan will still run to prevent the engine from overheating. The rivet head 20804 is a riveting point using existing riveting technology.

[0038] Furthermore, such as Figure 3 , Figure 4 and Figure 5 As shown, the housing 3 has a ring-shaped structure, and its axial direction is sealed to the drive shaft 5 through the bearing 303. The outer wall of the housing 3 has a plurality of sensing gear rings 302 arranged in a ring in the middle, and the outer edge of the outer wall of the housing 3 has a plurality of fan mounting screw holes 304 arranged in a ring in the outer edge. The inner wall of the housing 3 has a housing labyrinth groove 305 in the middle, and the outer edge of the housing 3 has a housing boss 306 for connecting with the front cover 1. The axial sidewall of the housing 3 has a notch 301 for mounting and positioning with the front cover 1. The housing 3 is made of die-cast aluminum alloy ADC12, and its sensing gear rings 302 are made of powder metallurgy and fixed by riveting, combining speed sensing and magnetic conduction functions. The depth of the housing labyrinth groove 305 is 4~5 mm, and the outer diameter of the housing boss 306 is 232 mm, for precise fit with the front cover 1. Preferably, the bearing 303 is a double-sided sealed bearing, and the housing 3 and the front cover 1 are tightly fitted by a rectangular sealing ring 9, providing double sealing to effectively prevent silicone oil leakage and the intrusion of external moisture and dirt.

[0039] Furthermore, such as Figure 9 As shown, the front cover 1 has a positioning groove 101 on its circumferential sidewall that matches the notch 301. The front cover 1 has a front cover labyrinth groove 103 in the middle of its inner wall. The front cover 1 has a front cover inner hole 102 on the outer edge of its inner wall. The front cover inner hole 102 and the housing boss 306 are tightly fitted together by a rectangular sealing ring 9. The front cover 1 is made of die-cast aluminum alloy ADC12. The inner diameter of the front cover inner hole 102 is 232 mm, which fits tightly with the housing boss 306.

[0040] Furthermore, such as Figure 3 , Figure 5 and Figure 9 As shown, the front cover 1 and the housing 3 have several ear plates arranged in a ring on their circumferential sidewalls. The ear plates on the front cover 1 and the housing 3 are connected by 12 hexagonal flange toothed bolts 10 with threaded holes.

[0041] Furthermore, such as Figure 1 As shown, the solenoid 4 is fixedly connected to the external engine, keeping it stationary. Inside the solenoid 4 is a coil and a Hall sensor mounted on the PCB board. The Hall sensor is opposite to the sensing gear ring 302 mounted on the housing 3, used to detect the housing rotation speed. When the coil of the solenoid 4 is energized, it forms a ring-shaped magnetic circuit, which sequentially passes through: the magnetic core of the solenoid 4, the drive shaft 5, the retaining ring 6, the inner ring of the bearing 303, the wave spring washer 7, and the flat washer. 8. The oil outlet baffle 20805 and the induction gear ring 302 return to the magnetic core of the solenoid 4. The magnetic field can attract the valve 20803 to move down. The oil outlet baffle 20805 at the end of the valve 20803 closes the oil outlet 203. The magnetic field is stable and concentrated, ensuring that the valve 20803 can open and close quickly and freely when the solenoid 4 is powered on and off, with accurate response and smooth control, thereby improving the reliability of the valve 20803. The wave spring washer 7 and the flat washer 8 are made of magnetically conductive material.

[0042] Working process: The initial state of the electronically controlled silicone oil clutch assembly is that the valve is normally open.

[0043] When the engine starts, the drive shaft 5 drives the drive wheel plate 2 to rotate. Under the action of centrifugal force, the silicone oil in the oil reservoir 212 flows through the opening end of the oil baffle groove 213 to the oil outlet 203, and then enters the working cavity formed by the first labyrinth groove 205, the second labyrinth groove 207, the front cover labyrinth groove 103 on the inner surface of the front cover 1, and the housing labyrinth groove 305 on the inner surface of the housing 3. The shear force of the silicone oil drives the housing 3 and the front cover 1 to rotate synchronously with the drive wheel plate 2, and the fan enters a high-speed coupling state.

[0044] Meanwhile, some of the silicone oil in the working chamber is scraped off by the oil scraper block 201 on the drive wheel plate 2 under centrifugal force, and enters the return oil channel 210 through the return oil port 202, and then flows back to the working chamber through the return oil hole 211 and the oil outlet hole 203. It is squeezed into the oil baffle groove 213. The siphon effect generated by the oil baffle groove 213 during operation, together with the centrifugal force, accelerates the silicone oil back to the oil storage chamber 212, forming a dynamically balanced cycle.

[0045] When the engine coolant temperature drops, the ECU sends a command to energize solenoid 4, generating a magnetic field. The magnetic lines of force travel through the magnetic core of solenoid 4, drive shaft 5, retaining ring 6, inner ring of bearing 303, wave spring washer 7, flat washer 8, oil outlet baffle 20805, and induction gear ring 302, returning to the magnetic core of solenoid 4 to form a closed loop. Figure 1 As shown, the oil outlet baffle 20805 is axially displaced, and the oil outlet baffle 20805 closes the oil outlet 203. Under the action of centrifugal force, the silicone oil in the working chamber is gradually scraped off by the oil scraper block 201 on the drive wheel plate 2, and enters the oil return channel 210 through the oil return port 202, and then flows into the oil storage chamber 212 through the oil return hole 211 and the oil baffle groove 213. The silicone oil in the working chamber gradually decreases, and the fan speed decreases smoothly, entering a low-speed separation state, thus achieving energy saving and noise reduction.

[0046] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A normally open electronically controlled silicone oil clutch assembly, characterized in that: Includes drive shaft, solenoid, retaining ring, housing, wave spring washer, flat washer, drive wheel plate, and front cover. The drive shaft passes sequentially through the solenoid, the retaining ring, the bearing mounted on the housing, the wave spring washer, and the flat washer, and is axially fixedly connected to the drive wheel plate; A cavity for accommodating the drive wheel plate is formed between the inner wall of the housing and the front cover. A first labyrinth groove and a second labyrinth groove are respectively provided on the two end faces of the drive wheel plate. The first labyrinth groove and the second labyrinth groove are respectively fitted with the front cover labyrinth groove on the inner surface of the front cover and the housing labyrinth groove on the inner surface of the housing to form a working cavity. The drive wheel plate has an annular oil storage chamber inside. The middle of the oil storage chamber is surrounded by an oil baffle ring forming an oil baffle groove. One end of the oil baffle groove is closed, and the other end is connected to the oil storage chamber. An oil outlet hole communicating with the working chamber is radially opened on the side wall of the closed end of the oil baffle groove. The drive wheel plate is provided with a valve assembly for opening and closing the oil outlet hole. When the solenoid is not energized, there is a gap between the valve assembly and the oil outlet hole. The drive wheel plate is also provided with a return flow mechanism.

2. The electrically controlled silicone oil clutch assembly with a normally open valve according to claim 1, characterized in that: The return mechanism includes an oil scraper block, an oil baffle block, an oil return channel, and an oil return hole. The oil scraper block is disposed on the circumferential side wall of the drive wheel plate. An oil return port is provided on the outer wall of the oil scraper block, and the outer wall of the oil scraper block is in close contact with the circumferential inner wall of the front cover. A gap is provided between the outer wall of the oil baffle block and the circumferential inner wall of the front cover. The oil return channel is disposed inside the drive wheel plate. One end of the oil return channel is connected to the oil return port, and the other end is connected to the closed end of the annular oil baffle groove through the oil return hole.

3. The electrically controlled silicone oil clutch assembly with a normally open valve according to claim 2, characterized in that: The drive wheel plate has an annular valve assembly mounting groove on the inner side of the outer wall near the housing for installing the valve assembly. The oil storage chamber is located on the outer side of the valve assembly mounting groove. The outer ends of the oil storage chamber and the oil baffle groove are closed by an oil storage cover plate. The valve assembly mounting groove has three circular holes arranged in an annular array for fixing the drive wheel plate.

4. The normally open valve electronically controlled silicone oil clutch assembly according to claim 3, characterized in that: The valve assembly includes a valve seat, a spring plate, a valve, and a rivet head. The valve is elastically connected to the valve seat via the spring plate, and the spring plate is fixed to the valve and the valve seat via the rivet head. The valve has an annular structure, and an oil outlet baffle is provided at the end away from the spring plate. The valve seat is fixed in the valve assembly mounting groove at the end away from the oil outlet. The valve assembly mounting groove at the end near the oil outlet has a baffle hole for the oil outlet baffle to pass through. In its natural state, the spring plate creates a gap between the oil outlet baffle and the oil outlet.

5. The normally open valve electronically controlled silicone oil clutch assembly according to claim 4, characterized in that: The housing has a ring structure and is axially sealed to the drive shaft through the bearing. The outer wall of the housing has a number of sensing gear rings arranged in a ring in the middle. The outer edge of the housing has a number of fan mounting screw holes arranged in a ring in the outer edge. The inner wall of the housing has a housing labyrinth groove in the middle. The outer edge of the housing has a housing boss for connecting with the front cover. The axial side wall of the housing has a notch for mounting and positioning with the front cover.

6. The normally open valve electronically controlled silicone oil clutch assembly according to claim 5, characterized in that: The front cover has a positioning groove on its circumferential sidewall that matches the notch, a front cover labyrinth groove in the middle of the inner wall of the front cover, and a front cover inner hole on the outer edge of the inner wall of the front cover. The front cover inner hole and the housing boss are tightly fitted by a rectangular sealing ring.

7. The normally open valve electronically controlled silicone oil clutch assembly according to claim 6, characterized in that: The front cover and the shell have a number of ear plates arranged in a ring on their circumferential sidewalls, and the ear plates are connected by toothed bolts on hexagonal flange faces.

8. The normally open valve electronically controlled silicone oil clutch assembly according to claim 7, characterized in that: The solenoid is fixedly connected to an external engine. Inside the solenoid are a coil and a Hall sensor mounted on a PCB board. The Hall sensor is opposite to the sensing gear ring on the housing and is used to detect the rotational speed of the housing. When the coil of the solenoid is energized, it forms a circular magnetic circuit. This circular magnetic circuit passes sequentially through: the magnetic core of the solenoid, the drive shaft, the retaining ring, the inner ring of the bearing, the wave spring washer, the flat washer, the oil outlet baffle, and the sensing gear ring, and returns to the magnetic core of the solenoid.

Images