Automatic replacing device for HMCVT filter

Abstract

The invention relates to an HMCVT filter automatic replacing device which comprises an oil pan and a pump, the oil pan is internally and rotatably provided with the filter automatic replacing device, the filter automatic replacing device comprises a first gear, the first gear is fixedly connected with a fixing shell, and a plurality of telescopic mechanisms are evenly distributed on the face, moving in the circumferential direction, of the fixing shell; the end part of the telescopic mechanism is fixedly connected with a filter; a locking device used for limiting the filter is arranged at the upper end of the oil pan and comprises shells symmetrically arranged on the two sides of the filter, telescopic pistons are arranged in the shells in a sliding mode, the ends of the pistons are used for clamping clamping heads of the filter, and the clamping heads are soaked in transmission oil. And a replacement positioning device which coaxially rotates with the automatic filter replacement device is arranged outside the oil pan. The situation that the oil pollution degree of the transmission is increased due to the fact that the filter loses action is prevented, and the automatic filter replacing device has higher stability.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic mechanical continuously variable transmission (HMCVT), and in particular relates to an automatic filter replacement device for an HMCVT. Background Art

[0002] Hydromechanical Continuously Variable Transmission (HMCVT) is one of the key technologies in construction machinery and engineering equipment. HMCVT achieves power distribution through a continuously variable speed mechanism, allowing vehicles or mechanical equipment to operate with high efficiency and performance. It achieves power transmission through a pump-controlled motor system in the hydraulic system, providing users with excellent performance and fuel efficiency.

[0003] The use of transmission oil in HMCVT can reduce friction, reduce wear, control the friction of the clutch and the performance of the synchronizer, and at the same time has the functions of carrying low-speed high torque, vibration load, heat dissipation and removing pollutants at the meshing of teeth. The function of the transmission filter is to filter foreign impurities, filter the friction material fibers of the clutch friction plate, steel plate and friction products, and filter the debris generated by the friction of metal parts such as gears, steel belts and chains. During the operation of the transmission, the oil in the transmission will continue to become dirty. The function of the transmission oil filter is to filter out the impurities generated by the transmission during operation, and supply clean transmission oil to each moving pair, solenoid valve, and oil circuit, which plays a role in lubrication, cooling, cleaning, rust prevention, and anti-friction, thereby protecting parts, ensuring transmission performance, and extending the service life of the transmission.

[0004] The transmission filter needs to be replaced regularly. During the replacement process, the following technical problems were found: the transmission filter is installed inside the HMCVT. Whether the filter needs to be replaced can only be determined by the usage time or mileage. There is a lot of uncertainty. If the filter is used for too long, the transmission oil will contain too many impurities (clutch friction plates, steel plates and friction products of friction material fibers, as well as filtering gears, steel belts, chains and other metal parts friction debris). This will affect the friction of the clutch and the performance of the synchronizer and the function of filtering foreign matter. How to know the content of impurities in the transmission oil, and make the transmission oil contain less impurities during use, and reduce the problems caused by lubrication during the long use of HMCVT are the current problems.

[0005] In order to maintain the purity and performance of the hydraulic oil in the HMCVT system, the filter plays a key role. The solid particles and contaminants in the oil can easily damage the components of the hydraulic system, reduce the system efficiency, and even cause serious failures. At present, the replacement of the filter is generally done manually. It is necessary to first stop the vehicle, then raise the vehicle, drain the transmission oil, and then remove the bottom cover to replace the filter. The replacement time is long and the use is inconvenient. Therefore, it is very important to develop an efficient and reliable HMCVT filter replacement technology. At the same time, during work, the filter will be easily dislocated or unstable due to the vibration generated by other mechanical equipment (such as the engine), causing the filter to lose its function and unable to filter the transmission oil, which makes the transmission prone to failure. Summary of the invention

[0006] In order to solve the problems of the prior art, the present invention proposes an automatic HMCVT filter replacement device, which can detect the content of impurities in the transmission oil and determine whether the filter needs to be replaced, thereby realizing automatic replacement of the filter in the HMCVT.

[0007] The purpose of the present invention and the technical problem to be solved are achieved by adopting the following technical solutions. According to an automatic filter replacement device of HMCVT proposed by the present invention, it includes an oil pan filled with transmission oil and a pump. An automatic filter replacement device is rotatably arranged in the oil pan. The automatic filter replacement device includes a first gear. A fixed shell is fixedly connected to the first gear. A plurality of telescopic mechanisms are evenly distributed on the surface of the fixed shell moving along the circumferential direction. A filter is fixedly connected to the end of the telescopic mechanism. The oil inlet of the filter is in the transmission oil. The pump is plugged into the oil outlet of the filter through an oil inlet pipe. A locking device for limiting the filter is arranged at the upper end of the oil pan. The locking device It includes a shell symmetrically arranged on both sides of the filter, a retractable piston is slidably arranged in the shell, the end of the piston is used to clamp the clamping head of the filter, and the clamping head is immersed in the transmission oil, a through hole is arranged on the surface of the shell close to the filter, and the clamping head passes through the through hole to clamp the filter; a replacement positioning device coaxially rotating with the automatic filter replacement device is arranged on the outside of the oil pan, and the replacement positioning device includes a second gear, and a plurality of teeth are equidistantly arranged on the outer circumference of the second gear, and a magnetoelectric induction sensor is arranged on the teeth, and the magnetoelectric induction sensor corresponds to the filter one by one.

[0008] Furthermore, a plurality of lower bases are fixedly connected at equal intervals to the outer circumferential surface of the first gear, the telescopic mechanism comprises a scissor-type telescopic arm fixedly connected to the lower base, an upper base is provided at the telescopic end of the scissor-type telescopic arm, an electric cylinder is provided between the lower base and the upper base, the filter is fixedly connected to the upper base, and an inlet for oil inlet to the filter is provided through the upper base, and the inlet corresponds to the oil inlet of the filter.

[0009] Furthermore, symmetrically distributed particle sensors and capacitive sensors are respectively provided on the inner wall surface of the oil pan to monitor the quality of the transmission oil in the oil pan.

[0010] Furthermore, a motor is provided outside the oil pan, the second gear is fixedly connected to the output shaft of the motor, and the output shaft of the motor extends into the oil pan and is fixedly connected to the first gear.

[0011] Furthermore, a shaft seal is provided at the connection between the output shaft of the motor and the oil pan.

[0012] Furthermore, a first spring and a second spring are respectively provided in the two shells, and a first oil inlet passage and a second oil inlet passage are respectively penetrated through the upper ends of the two shells, the first oil inlet passage and the second oil inlet passage are both connected to the pump, a first solenoid valve and a fourth solenoid valve are respectively provided on the first oil inlet passage and the second oil inlet passage, a first piston is provided between the first oil inlet passage and the first spring, a second piston is provided between the second oil inlet passage and the second spring, the first oil inlet passage and the second oil inlet passage are respectively connected to a first oil return passage and a second oil return passage, a second solenoid valve and a third solenoid valve are respectively provided on the first oil return passage and the second oil return passage, and the oil outlet ends of the first oil return passage and the second oil return passage are connected to the oil pan.

[0013] Furthermore, a wedge is provided at the end of the clamping head.

[0014] In summary, the beneficial effects of the present invention are as follows: 1. Compared with the traditional HMCVT which cannot sense the transmission oil quality and filter, the present invention arranges a particulate matter sensor and a capacitive sensor to monitor the quality of the transmission oil. When the quality deteriorates, the filter can be automatically replaced through the automatic filter replacement device without disassembling vehicle parts. The replacement is convenient and can be replaced in real time, which can extend the service life of the transmission oil. At the same time, the excellent transmission oil quality is more conducive to working scenarios such as gear shifting and gear lubrication.

[0015] 2. The present invention adopts a magnetoelectric induction sensor to help the filter replacement device to perform positioning replacement, with fast response speed and high replacement accuracy.

[0016] 3. In the present invention, the filter is fixed by a locking device and a telescopic mechanism, which can prevent the filter from moving or misaligning due to vibration caused by other components, and prevent the filter from falling off due to unstable fixation, thereby preventing the filter from losing its function and causing increased transmission oil contamination, making the automatic filter replacement device more stable and reducing the probability of failure.

[0017] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The present invention is a schematic diagram of a locking device in an automatic HMCVT filter replacement device.

[0019] Figure 2 It is a schematic diagram of a telescopic structure in an automatic HMCVT filter replacement device of the present invention.

[0020] Figure 3 It is a schematic diagram of an automatic filter replacement device in an automatic filter replacement device for HMCVT of the present invention.

[0021] Figure 4 It is a schematic diagram of a replacement positioning device in an automatic replacement device for an HMCVT filter of the present invention. DETAILED DESCRIPTION

[0022] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and preferred embodiments.

[0023] See also Figure 1 , an automatic filter replacement device for HMCVT, comprising an oil pan 9 filled with transmission oil 10 and a pump 15, an automatic filter replacement device 7 is rotatably arranged in the oil pan 9, the automatic filter replacement device 7 comprises a first gear 6, a fixed shell is fixedly connected to the first gear, a plurality of telescopic mechanisms are evenly and evenly distributed on the surface of the fixed shell moving (rotating) in the circumferential direction, a filter 1 is fixedly connected to the end of the telescopic mechanism, a plurality of lower bases 5 are evenly fixedly connected to the outer circumferential surface of the first gear 6, the telescopic mechanism comprises a scissor-type telescopic arm 4 fixedly connected to the lower base 5, an upper base 2 is arranged at the telescopic end of the scissor-type telescopic arm 4, an electric cylinder 3 is arranged between the lower base 5 and the upper base 2, the filter 1 is fixedly connected to the upper base 2, and an inlet for oil inlet of the filter 1 is penetrated on the upper base 2, the oil inlet of the filter 1 is in the transmission oil 10, and the pump 15 is plugged with the oil outlet of the filter 1 through the oil inlet pipe 13; The upper end of the oil pan 9 is provided with a locking device for limiting the position of the filter 1, and the locking device includes a housing 21 symmetrically arranged on both sides of the filter 1, and the housing 21 is fixed to the transmission housing. The two housings 21 are respectively provided with a first spring 20 and a second spring 25, and the upper ends of the two housings 21 are respectively penetrated with a first oil inlet and a second oil inlet, and the first oil inlet and the second oil inlet are both connected to the pump 15. The first oil inlet and the second oil inlet are respectively provided with a first solenoid valve 18 and a fourth solenoid valve 27, and the first oil inlet and the first spring 20 are connected to each other. A first piston 22 is provided, and a second piston 24 is provided between the second oil inlet circuit and the second spring 25. The first oil inlet circuit and the second oil inlet circuit are respectively connected to the first oil return circuit and the second oil return circuit. The first oil return circuit and the second oil return circuit are respectively provided with a second solenoid valve 19 and a third solenoid valve 26, and the oil outlet ends of the first oil return circuit and the second oil return circuit are connected to the oil pan 9. Clamping heads for clamping the filter 1 on the upper base 2 are provided at the ends of the two pistons, and the clamping heads are immersed in the transmission oil 10. A wedge 23 is provided at the end of the clamping head to support the upper base 2.

[0024] See also Figure 2 , a replacement positioning device 12 coaxially rotating with the automatic filter replacement device 7 is provided on the outside of the oil pan 9, and the replacement positioning device 12 includes a second gear 17, and a plurality of teeth are equidistantly provided on the outer circumference of the second gear 17, and a magnetoelectric induction sensor 16 is provided on the teeth, and the magnetoelectric induction sensor 16 corresponds to the filter 1 one by one. At the same time, a motor 14 is provided on the outside of the oil pan 9, and the second gear 17 is fixedly connected to the output shaft of the motor 14, and the output shaft of the motor 14 extends into the oil pan 9 and is fixedly connected to the first gear 6, which is used to drive the first gear 6 and the second gear 17 to rotate coaxially. When the automatic filter replacement device 7 rotates, the magnetoelectric induction sensor 16 rotates at the same time. Every time a tooth is rotated, the magnetic resistance of the magnetic circuit of the magnetoelectric induction sensor 16 changes once, and the motor 14 stops working. A shaft seal is provided at the connection between the output shaft of the motor 14 and the oil pan 9 to prevent oil leakage in the oil pan 9; The inner wall surface of the oil pan 9 is provided with symmetrically distributed particle sensors 8 and capacitance sensors 11 for measuring the dielectric constant and particle content of the oil, and classifying it into four categories: excellent, good, medium and poor. At the same time, the judgment is based on the BP neural network method to establish a transmission oil quality identification and classification system. 36 transmission oil samples are selected based on the dielectric constant and particle content measured by the particle sensor 8 and the capacitance sensor 11. The transmission oil quality identification and classification system judges the quality of the transmission oil at this time. When the quality is poor, the transmission control unit sends a signal to replace the filter; when the quality is excellent, good or medium, it is maintained as it is.

[0025] Automatic replacement process of filter 1: According to the above judgment criteria, when the filter needs to be replaced, the pump 15 works, and at the same time, the first solenoid valve 18 and the fourth solenoid valve 27 are opened, the second solenoid valve 19 and the third solenoid valve 26 are closed, and the oil enters the piston, compressing the corresponding first spring 20 and the second spring 24 respectively, releasing the limit of the clamping head on the upper base 2, and controlling the electric cylinder 3 to shrink at the same time, the current filter 1 descends and separates from the oil inlet pipe 13, until the scissor-type telescopic arm 4 shrinks to the bottom, and then the motor 14 works to drive the first gear 6 and the second gear 17 to rotate, and when the next filter 1 rotates into place (reference Figure 1 When the oil outlet of the filter 1 corresponds to the oil inlet pipe 13, the magneto-electric induction sensor 16 sends a signal, the motor 14 stops, and then the electric cylinder 3 extends, driving the new filter 1 to rise until its oil outlet is plugged into the oil inlet pipe 13, and the movement of the electric cylinder 3 stops. Then the piston is reset, the second solenoid valve 19 and the third solenoid valve 26 are opened, the first solenoid valve 18 and the fourth solenoid valve 27 are closed, and the oil is pushed out by the first spring 20 and the second spring 24, and flows to the oil pan 9 through the first and second oil return paths. At the same time, the clamping head and the wedge 23 thereon lock the upper base 2, thereby fixing the filter 1, and the replacement is completed; After the replacement is completed, the oil in the oil pan 9 enters the filter 1 from the bottom of the upper base 2 through the pump 15, and is pumped out by the pump 15 through the oil inlet pipe 13 after being filtered by the filter 1.

[0026] The above is only a preferred embodiment of the present invention. Any technician familiar with the profession, without departing from the scope of the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. An automatic HMCVT filter replacement device, comprising an oil pan (9) filled with transmission oil (10) and a pump (15), characterized in that: An automatic filter replacement device (7) is rotatably provided in the oil pan (9), the automatic filter replacement device (7) comprising a first gear (6), a plurality of telescopic mechanisms being fixedly connected at equal intervals to the outer circumferential surface of the first gear (6), a filter (1) being fixedly connected to the end of the telescopic mechanism, an oil inlet of the filter (1) being located in the transmission oil (10), and the pump (15) being plugged into the oil outlet of the filter (1) via an oil inlet pipe (13); The upper end of the oil pan (9) is provided with a locking device for limiting the position of the filter (1), the locking device comprising a housing (21) symmetrically arranged on both sides of the filter (1), a retractable piston slidably arranged in the housing (21), the end of the piston being used to clamp a clamping head of the filter (1), and the clamping head being immersed in the transmission oil (10); The oil pan (9) is provided with a replacement positioning device (12) coaxially rotating with the filter automatic replacement device (7), the replacement positioning device (12) comprising a second gear (17), a plurality of magneto-electric induction sensors (16) being equidistantly provided on the outer circumference of the second gear (17), the magneto-electric induction sensors (16) corresponding one to one with the filters (1).

2. The HMCVT filter automatic replacement device according to claim 1, characterized in that: A plurality of lower bases (5) are fixedly connected at equal intervals to the outer circumferential surface of the first gear (6); the telescopic mechanism comprises a scissor-type telescopic arm (4) fixedly connected to the lower base (5); an upper base (2) is provided at the telescopic end of the scissor-type telescopic arm (4); an electric cylinder (3) is provided between the lower base (5) and the upper base (2); the filter (1) is fixedly connected to the upper base (2); and an inlet for oil inlet to the filter (1) is provided through the upper base (2).

3. The HMCVT filter automatic replacement device according to claim 1, characterized in that: Symmetrically distributed particle sensors (8) and capacitive sensors (11) are respectively arranged on the inner wall surface of the oil pan (9).

4. The HMCVT filter automatic replacement device according to claim 1, characterized in that: A motor (14) is provided outside the oil pan (9), the second gear (17) is fixedly connected to the output shaft of the motor (14), and the output shaft of the motor (14) extends into the oil pan (9) and is fixedly connected to the first gear (6).

5. The HMCVT filter automatic replacement device according to claim 4, characterized in that: A shaft seal is provided at the connection between the output shaft of the motor (14) and the oil pan (9).

6. The HMCVT filter automatic replacement device according to claim 1, characterized in that: A first spring (20) and a second spring (25) are respectively arranged in the two housings (21), and a first oil inlet passage and a second oil inlet passage are respectively penetrated through the upper ends of the two housings (21). The first oil inlet passage and the second oil inlet passage are both in communication with the pump (15). A first solenoid valve (18) and a fourth solenoid valve (27) are respectively arranged on the first oil inlet passage and the second oil inlet passage. A first piston (22) is arranged between the first oil inlet passage and the first spring (20), and a second piston (24) is arranged between the second oil inlet passage and the second spring (25). The first oil inlet passage and the second oil inlet passage are respectively in communication with a first oil return passage and a second oil return passage. A second solenoid valve (19) and a third solenoid valve (26) are respectively arranged on the first oil return passage and the second oil return passage. Oil outlet ends of the first oil return passage and the second oil return passage are in communication with the oil pan (9).

7. The HMCVT filter automatic replacement device according to claim 1, characterized in that: A wedge (23) is provided at the end of the clamping head.

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