Gearbox filter element structure with double oil outlets

Abstract

The utility model discloses a double-oil-outlet-hole gearbox filter element structure. A gearbox is provided with a mechanical pump and an electronic pump in a matched mode. Comprising a first fine filtration filter element, a coarse filtration filter element and a second fine filtration filter element which are coaxially connected together in sequence, the radial exteriors of the rough filtration filter element, the first fine filtration filter element and the second fine filtration filter element are all communicated with an oil outlet of the electronic pump and an oil outlet of the electronic pump; an oil outlet of the first fine filtration filter element and an oil outlet of the second fine filtration filter element are both used for supplying oil to the gearbox; one end of the rough filtration filter element is communicated with the oil purification cavity of the first fine filtration filter element through a first bypass valve, and the other end of the rough filtration filter element is communicated with the oil purification cavity of the second fine filtration filter element through a second bypass valve. The mechanical pump and the electronic pump can be matched with a gearbox, meanwhile, the filtering requirements of the mechanical pump and the electronic pump are set, the product size and cost are remarkably reduced, and the technical development direction of light weight and integration in the industry is met; and the smaller total volume can adapt to the installation space in more vehicle types.

Description

Technical Field

[0001] The utility model relates to the technical field of automotive filters, in particular to a filtering structure for a dual lubrication system of a motor vehicle transmission. Background Art

[0002] There are many parts in the motor vehicle transmission that are in contact with each other and move relative to each other, such as gears, bearings, and clutches, etc. Lubricating oil can form an oil film on the surfaces of these parts, reduce friction, and extend the service life of the parts. When the transmission is working, it generates heat due to friction, and the lubricating oil also has functions such as heat dissipation and cooling, anti-corrosion, and shock absorption.

[0003] When the motor vehicle is working, impurities such as worn metal debris, external pollutants, and lubricating oil oxides will be mixed into the transmission lubricating oil, so it is necessary to continuously circulate and filter the transmission lubricating oil.

[0004] The pumps that drive the circulation of the transmission lubricating oil include mechanical pumps and electronic pumps.

[0005] A mechanical pump is a pump driven by the engine. When the engine stops, the mechanical pump also stops. The mechanical pump has the functions of providing basic lubrication and generating hydraulic pressure.

[0006] An electronic pump is a pump driven by an electric motor and can operate independently according to requirements. Its operation does not depend on the engine speed.

[0007] Mechanical pumps usually have higher efficiency at high engine speeds and lower efficiency at low engine speeds. Therefore, in some high-end vehicles, two sets of transmission oil drive devices, namely electronic pumps and mechanical pumps, are used simultaneously. This has the following advantages:

[0008] 1. At low engine speeds, the electronic pump is used to make up for the insufficient power of the lubricating oil.

[0009] 2. In urban roads, the engine starts and stops frequently. The electronic pump is used to ensure the lubrication of the transmission; on highways, the lubricating oil is mainly driven by the mechanical pump.

[0010] 3. When the engine is cold-started, the lubricating oil becomes viscous and the engine speed is not high. At this time, it is not easy for the mechanical pump to effectively drive the lubricating oil through the filter element of the oil filter. The electronic pump can pre-work before the engine starts to generate lubricating oil pressure, avoiding increased wear of the transmission due to ineffective lubrication during cold start.

[0011] In short, the effective combination of electronic pumps and mechanical pumps has been more and more widely used in high-end vehicles.

[0012] Corresponding to the electronic pump and the mechanical pump, an oil filter for the electronic pump and an oil filter for the mechanical pump need to be set up simultaneously.

[0013] The oil filter has a filter element inside. During operation, the filter element intercepts impurities in the oil. The accumulation of impurities in the oil filter gradually increases the filtration resistance of the filter element. When the filter element becomes blocked, the oil filter fails.

[0014] After the oil filter fails, the transmission cannot be effectively lubricated, and problems such as increased wear and rising temperature will inevitably occur, leading to a shortened lifespan of the transmission. In severe cases, the transmission may be damaged. Therefore, it is necessary to design a bypass structure for the oil filter to ensure that lubricating oil can still flow downstream (to the transmission) when the filter element is blocked.

[0015] If the bypass lubricating oil is not filtered at all, it may also cause increased wear and a shortened lifespan of the transmission. Therefore, it is necessary to design a bypass coarse filtration structure.

[0016] If a coarse filtration structure is separately provided for each of the two oil filters, the cost is relatively high and the occupied space is relatively large.

[0017] In the development of the automotive industry, more and more technologies and devices have been integrated into automobiles, including safety systems, environmental protection devices, etc., making integration, lightweight, and reduction of component volume a design goal for automotive parts.

[0018] The design concept of the present utility model is to integrate the filter elements of two oil filters with the same coarse filter to form an integrated dual - filtration structure. The integrated design reduces the product volume compared to two separately - arranged filter elements. The two filter elements sharing one coarse filter further reduces the product volume and saves the cost of one coarse filter. Summary of the Utility Model

[0019] The purpose of the present utility model is to provide a spring - self - locking bypass filtration structure. For the case where the transmission is equipped with both an electronic pump and a mechanical pump, an integrated filtration structure and a bypass coarse filtration structure are provided for the oil filter, while enjoying the convenience of using both the electronic pump and the mechanical pump, minimizing the volume of the filtration structure and reducing the cost as much as possible.

[0020] To achieve the above - mentioned purpose, a dual - oil - outlet transmission filter element structure of the present utility model is provided. The transmission is equipped with a mechanical pump and an electronic pump; it includes a first fine - filter element, a coarse - filter element, and a second fine - filter element that are sequentially connected coaxially.

[0021] The radial outsides of the coarse - filter element, the first fine - filter element, and the second fine - filter element are all connected to the oil outlet of the electronic pump and the oil outlet of the mechanical pump.

[0022] The oil outlet of the first fine - filter element and the oil outlet of the second fine - filter element are both used to supply oil to the transmission.

[0023] One end of the coarse filter element communicates with the clean oil chamber of the first fine filter element through the first bypass valve, and the other end of the coarse filter element communicates with the clean oil chamber of the second fine filter element through the second bypass valve.

[0024] The first bypass valve and the second bypass valve are collectively referred to as the bypass valve.

[0025] The first fine filter element and the second fine filter element have the same structure, and both include a cylindrical hollowed-out skeleton. A fine filter layer is wound around the outside of the hollowed-out skeleton. An oil outlet end cover is installed at one axial end of the fine filter layer, and a connecting end cover is installed at the other axial end of the fine filter layer. An oil outlet is provided on the oil outlet end cover and communicates with the hollowed-out skeleton. The circumferential outer surface of the fine filter layer is its oil inlet end; a bypass port is provided on the connecting end cover, and an installation frame is provided inside the hollowed-out skeleton. A bypass valve is installed between the installation frame and the bypass port. The bypass valve includes a valve rod. One end of the valve rod facing the bypass port is provided with a large head end. A spring is sleeved on the valve rod. One end of the spring is press-fitted with the installation frame and the other end is press-fitted with the large head end; the spring is used to press the large head end against the bypass port to close the bypass port.

[0026] The coarse filter element includes a cylindrical coarse filter layer. A first end cover connected to the connecting end cover of the first fine filter element is provided at one axial end of the coarse filter layer, and a second end cover connected to the connecting end cover of the second fine filter element is provided at the other axial end of the coarse filter layer; the bypass ports of each bypass valve are all communicated with the inner cavity of the coarse filter element.

[0027] The utility model has the following advantages:

[0028] The utility model integrates the mechanical pump filter element (the first fine filter element) and the electronic pump filter element (the second fine filter element) together with the coarse filter element coaxially, and highly integrates a plurality of originally separately arranged filtering structures into one, reducing the number of components, reducing the overall volume of the product, and improving the assembly efficiency. The two fine filter elements share one coarse filter element, saving one coarse filter element, reducing the number of components, and reducing the volume and cost of the product. In short, the utility model can meet the filtering requirements of the mechanical pump and the electronic pump simultaneously set in the gearbox, and significantly reduces the volume and cost of the product, meeting the technical development direction of lightweight and integration in the industry; the smaller overall volume can also adapt to the installation space in more vehicle models.

[0029] The specific structural settings of the coarse filter element, the first fine filter element and the second fine filter element are simple and convenient for axial docking in sequence, ensuring that the product structure is compact and the volume is small; the structure of the bypass valve is very simple and does not have multiple components of a common bypass valve. It can rely on elasticity to press the large-head end against the bypass port to close the bypass valve during the normal operation of the filter element; when the filter element is blocked, the spring is naturally compressed by the oil pressure in the inner cavity of the coarse filter element, causing the large-head end to leave the bypass port, thereby opening the bypass port. Therefore, whether the first fine filter element or the second fine filter element is blocked, the bypass port of the blocked fine filter element will automatically open under the action of oil pressure, so that the lubricating oil after coarse filtration flows downward through the hollow skeleton and the oil outlet, avoiding the failure of the lubrication system due to the blockage of the fine filter element.

[0030] In addition to the case of the fine filter element being blocked, when the engine is cold-started, the viscosity of the transmission lubricating oil is relatively large, and it is also possible that the lubricating oil cannot pass through the fine filter element smoothly. In this case, the situation is similar to that of the fine filter element being blocked, and the bypass valve will automatically open under the action of the pressure difference to ensure the smooth flow of the lubricating oil path and protect the downstream moving pairs. Description of the Drawings

[0031] Figure 1 It is a schematic structural diagram of the present invention when the fine filter element is not blocked and the bypass port is not opened.

[0032] Figure 2 It is a schematic structural diagram of the present invention when the fine filter element is blocked and the bypass port is opened.

[0033] Figure 3 is Figure 2 The enlarged view of part A in Detailed Description of the Invention

[0034] As Figures 1 to 3 shown, the present invention provides a double-outlet-hole transmission filter element structure, and a mechanical pump and an electronic pump are provided for the transmission; the present invention includes a first fine filter element 1, a coarse filter element 2 and a second fine filter element 3 that are connected together coaxially in sequence;

[0035] The radial outsides of the coarse filter element 2, the first fine filter element 1 and the second fine filter element 3 are all communicated with the oil outlet of the electronic pump and the oil outlet of the electronic pump;

[0036] The oil outlet of the first fine filter element 1 and the oil outlet 4 of the second fine filter element 3 are both used to supply oil to the transmission of the motor vehicle;

[0037] One end of the coarse filter element 2 is communicated with the clean oil cavity of the first fine filter element 1 through a first bypass valve 5, and the other end of the coarse filter element 2 is communicated with the clean oil cavity of the second fine filter element 3 through a second bypass valve 6.

[0038] The utility model integrates the mechanical pump filter element (the first fine filter element 1) and the electronic pump filter element (the second fine filter element 3) coaxially together with the coarse filter element 2, highly integrating multiple originally separately arranged filtering structures into one, reducing the number of components, decreasing the overall volume of the product, and improving the assembly efficiency. The two fine filter elements share one coarse filter element 2, saving one coarse filter element 2, reducing the number of components, and decreasing the product volume and cost. In short, the utility model can meet the filtering requirements of both the mechanical pump and the electronic pump set in the transmission at the same time, significantly reducing the product volume and cost, and conforming to the technical development direction of lightweight and integration in the industry; the smaller overall volume can also adapt to the installation space in more vehicle models.

[0039] The first bypass valve 5 and the second bypass valve 6 are collectively referred to as the bypass valve;

[0040] The structures of the first fine filter element 1 and the second fine filter element 3 are the same, and both include a cylindrical hollowed-out skeleton 7. An outer fine filter layer 8 is wound around the hollowed-out skeleton 7. An oil outlet end cover 9 is installed at one axial end of the fine filter layer 8, and a communication end cover 10 is installed at the other axial end of the fine filter layer 8. An oil outlet 4 communicating with the hollowed-out skeleton 7 is provided on the oil outlet end cover 9, and the circumferential outer surface of the fine filter layer 8 is its oil inlet end; a bypass port 11 is provided on the communication end cover 10, and an installation frame 12 is provided inside the hollowed-out skeleton 7. A bypass valve is installed between the installation frame 12 and the bypass port 11. The bypass valve includes a valve stem 13. A large head end 14 is provided at one end of the valve stem 13 facing the bypass port 11. A spring 15 is sleeved on the valve stem 13. One end of the spring 15 is pressed against the installation frame 12 and the other end is pressed against the large head end 14; the spring 15 is used to press the large head end 14 against the bypass port 11 to close the bypass port 11; the other end of the valve stem 13 slides through the installation frame 12.

[0041] The coarse filter element 2 includes a cylindrical coarse filter layer 16. A first end cover 17 connected to the communication end cover 10 of the first fine filter element 1 is provided at one axial end of the coarse filter layer 16, and a second end cover 18 connected to the communication end cover 10 of the second fine filter element 3 is provided at the other axial end of the coarse filter layer 16; the bypass ports 11 of each bypass valve are all communicated with the inner cavity of the coarse filter element 2 (the inner cavity surrounded by the cylindrical coarse filter layer 16).

[0042] The specific structural settings of the coarse filter element 2, the first fine filter element 1 and the second fine filter element 3 are simple and convenient for axial docking in sequence, ensuring that the product structure is compact and the volume is small; the bypass valve structure is very simple, without multiple components of a common bypass valve, and relying on elasticity, the large head end 14 can be pressed against the bypass port 11 to close the bypass valve during the normal operation of the filter element; when the filter element is blocked, the spring 15 is naturally compressed by the oil pressure in the inner cavity of the coarse filter element 2, causing the large head end 14 to leave the bypass port 11, thus opening the bypass port 11. Therefore, whether the first fine filter element 1 or the second fine filter element 3 is blocked, the bypass port 11 of the blocked fine filter element will automatically open under the action of oil pressure, so that the lubricating oil after coarse filtration flows downward along the hollow skeleton 7 and the oil outlet 4, avoiding the failure of the lubrication system due to the blockage of the fine filter element.

[0043] During use, the utility model is installed on a motor vehicle and is located between an electronic pump, a mechanical pump and a gearbox in the circulating path of the lubricating oil. The electronic pump and the mechanical pump may work simultaneously or may be turned on separately. The electronic pump and the mechanical pump are collectively referred to as pumps; when the electronic pump and / or the mechanical pump works, the pump extracts the lubricating oil in the gearbox and sends the lubricating oil to the utility model after pressurization; no matter which pump works, the outer circumferential surface of the coarse filter element 2 bears the oil pressure; when the fine filter element is not blocked and filters normally, the elasticity of the spring 15 is greater than the pressure drop when the lubricating oil passes through the fine filter element. At this time, under the action of the elasticity of the spring 15, the large head end 14 is tightly pressed against the bypass port 11, so the lubricating oil in the coarse filter element 2 no longer flows after being disturbed at the start, and the fine filter element normally plays the filtering role. If only one of the two pumps is turned on, the entire circulating oil path where the closed pump is located is blocked, so there will be no continuous flow of lubricating oil in the fine filter element corresponding to the closed pump. The lubricating oil enters the hollow skeleton 7 after passing through the fine filter layer 8 of the fine filter element, and then flows from the oil outlet 4 downward to the gearbox.

[0044] When any fine filter element is blocked, the high pressure generated by the pump acts on the large head end 14, and the pressure in the hollow skeleton 7 is very low due to the blockage of the fine filter element. At this time, the oil pressure difference on both sides of the large head end 14 in the axial direction is greater than the elasticity of the spring 15, so the large head end 14 drives the valve stem 13 to displace in the direction of the oil outlet 4, causing the large head end 14 to leave the bypass port 11. At this time, the lubricating oil in the coarse filter can flow downward along the hollow skeleton 7 and the oil outlet 4 of the blocked fine filter element to ensure the uninterrupted circulation of the oil path.

[0045] The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications or equivalent substitutions can still be made to the present invention, and any modification or partial substitution without departing from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A dual-oil-outlet gearbox filter element structure, the gearbox is equipped with a mechanical pump and an electronic pump; it is characterized by: It comprises a first fine filter element, a coarse filter element and a second fine filter element which are coaxially connected in sequence; The radial outer portions of the coarse filter element, the first fine filter element and the second fine filter element are all connected to the oil outlet of the electronic pump and the oil outlet of the electronic pump; The oil outlet of the first fine filter element and the oil outlet of the second fine filter element are both used to supply oil to the gearbox; One end of the coarse filter element is communicated with the clean oil cavity of the first fine filter element through a first bypass valve, and the other end of the coarse filter element is communicated with the clean oil cavity of the second fine filter element through a second bypass valve.

2. A dual oil outlet transmission filter structure according to claim 1, characterized in that: The first bypass valve and the second bypass valve are collectively referred to as bypass valves; The first fine filter element and the second fine filter element have the same structure, both of which include a cylindrical hollow skeleton, a fine filter layer is arranged around the hollow skeleton, an oil outlet end cap is installed at one axial end of the fine filter layer, and a connecting end cap is installed at the other axial end of the fine filter layer, the oil outlet end cap is provided with an oil outlet communicated with the hollow skeleton, and the circumferential outer surface of the fine filter layer is its oil inlet end; a bypass port is provided on the connecting end cap, a mounting frame is provided in the hollow skeleton, a bypass valve is installed between the mounting frame and the bypass port, the bypass valve includes a valve stem, a large head end is provided at one end of the valve stem facing the bypass port, a spring is sleeved on the valve stem, one end of the spring is pressed against the mounting frame and the other end is pressed against the large head end; the spring is used to press the large head end against the bypass port to close the bypass port; The coarse filter element includes a cylindrical coarse filter layer, one axial end of the coarse filter layer is provided with a first end cover connected to the connecting end cover of the first fine filter element, and the other axial end of the coarse filter layer is provided with a second end cover connected to the connecting end cover of the second fine filter element; the bypass ports of each bypass valve are connected to the inner cavity of the coarse filter element.

Images