WO2014082474A1

WO2014082474A1 - Bypass valve and automatic transmission oil cooling system having same

Info

Publication number: WO2014082474A1
Application number: PCT/CN2013/082824
Authority: WO
Inventors: 李海亮; 殷红敏; 刘辉
Original assignee: 安徽江淮汽车股份有限公司
Priority date: 2012-11-28
Filing date: 2013-09-03
Publication date: 2014-06-05
Also published as: CN102954199B; CN102954199A

Abstract

Disclosed are a bypass valve (2) and an automatic transmission oil cooling system having the bypass valve, the system comprising a first circulation circuit (C1) and a second circulation circuit (C2), wherein an automatic transmission oil in the first circulation circuit (C1) flows back to an automatic transmission (1) via a cooling device that is connected to a cooling pipeline; the automatic transmission oil in the second circulation circuit (C2) directly flows back to the automatic transmission (1) via the cooling pipeline; valves are respectively arranged in the first and second circulation circuits (C1, C2) and are integrated on a temperature-sensing mechanical control valve (24) in a bypass valve; the valves can control the flowing of the automatic transmission oil through the first or second circulation circuit (C1, C2); and the flow direction of the automatic transmission oil is controlled according to the temperature of the automatic transmission oil, such that the automatic transmission oil selectively flows through the first or second circulation circuit (C1, C2), so that the oil temperature is always within a relatively reasonable temperature range, and a vehicle can be adapted to tropical conditions, as well as environmental conditions in frigid zones.

Description

Bypass Tonggang and automatic transmission oil cooling system with the bypass valve

Technical field

The present invention relates to the field of automotive technology, and more particularly to a bypass valve and an automatic transmission oil cooling system having the same. Background technique

Various automakers are now introducing more and more automatic transmission models, which has become a trend for customers to purchase cars. At the same time, the sales area of a certain automatic transmission has a large latitude and longitude span, which makes the same model adapt to the tropical conditions while adapting to the cold environment.

The automatic transmission must have a transmission oil cooling system. There are basically two types of cooling for the transmission oil cooling system of various automatic shifting models:

One is that, as shown in FIG. 1, the automatic transmission 1 is cooled by a water-cooled oil cooler 3 and an air-cooled oil cooler 4 built in the radiator: the automatic transmission 1 starts to work, and the transmission oil passes through The water-cooled oil cooler 3 and the air-cooled oil cooler 4 in the radiator are cooled and returned to the gearbox.

Alternatively, as shown in Fig. 2, the transmission is cooled by the air-cooled oil cooler 4: When the automatic transmission 1 starts operating, the transmission oil is cooled by the air-cooled oil cooler 4 and returned to the transmission.

These two forms of transmission oil cooling system are simple and easy to arrange, but as long as the transmission is working, the transmission oil is cooled by the oil cooler at any time, causing the two systems to be used only in warm, tropical areas. Under low temperature conditions in the cold zone, the transmission oil temperature is too low. For example, in the restart state, the transmission oil is very viscous, and the performance of the transmission is degraded or even damaged due to the unsmooth flow path.

In order to solve the above problems, various solutions have been proposed in the past.

One solution is to use a small bypass line to create a bypass path that creates a short circuit between the input and output lines of the oil cooler.

Although this method can prevent the performance of the transmission from being degraded or even damaged due to the unsmooth oil passage caused by the viscosity of the transmission oil under low temperature conditions, some transmission oils may not be cooled by the oil cooler, which may cause under high temperature conditions. The transmission oil temperature is too high.

Therefore, a bypass valve is usually provided in the bypass passage formed in the automatic transmission oil cooling system, and the transmission oil passage is controlled by the bypass valve. For example, U.S. Patent No. 6,253,837 describes a bypass valve In use, the bypass valve allows a short circuit formed between the heat exchanger input and the heat exchanger output to disable the heat exchanger under certain temperature conditions. The bypass valve includes a housing defining a valve chamber and three main ports in communication with the chamber, one of which is a valve port. A temperature responsive brake is located in the chamber and operates a spring loaded valve member to open and close a valve port that can be coupled to the heat exchanger input or output.

The use of a bypass valve for a heat exchange circuit is also described in U.S. Patent 7,735,546. The valve housing forms a valve chamber that houses a bypass valve port that is surrounded by the valve seat. A thermal brake is mounted in the chamber and an annular valve member is mounted on the brake. A turns spring extends around the brake and biases the valve member toward engagement with the valve seat, thereby closing the bypass port. A return spring is attached to one end of the brake and causes the brake to retract, causing the valve member to open the bypass port.

While these known thermal bypass valves have worked reasonably well for their intended purpose, it is desirable to improve the complex structure of such valves to increase work efficiency. Summary of the invention

The present invention provides a bypass valve for solving the problem that the transmission oil temperature is too low in a cold zone to cause a decrease or even damage of the transmission performance, and the complicated structure and working efficiency of the bypass valve. The utility model comprises: a valve cover, a push rod base, a push rod, a temperature sensitive mechanical control valve, a return spring; a valve cover, the valve cover forms a valve chamber which is closed at one end and open at the other end, and the push base is fixedly connected with the open end and closed Engaged, the valve cover is provided with a first port connected to the automatic transmission oil passage output port, a second port connected to the automatic transmission oil passage input port, and connected to the cooling device oil passage input port. a third port, a fourth port connected to the cooling device oil passage output port, wherein the first port, the second port, the third port, and the fourth port are in communication with the valve chamber, the first port and the first port The three ports, the second port and the fourth port are respectively disposed on two sides of the valve cover; the valve chamber is further provided with a bypass valve port, and the first port and the second port are provided. Fluid communication;

a push rod is mounted in the valve cover, fixed on the push rod base, and extends along the closed end of the valve cover center axial direction of the push rod base;

The temperature sensing mechanical control valve is set on the push rod, the return spring is installed in the valve cover, and is axially pressurized to the temperature sensing machine control valve and the closed end of the valve cover;

Wherein, the temperature sensing mechanical control valve is internally provided with a temperature sensing element whose volume changes with temperature; The temperature range is set, and the temperature sensing mechanical control valve reciprocates axially along the center of the push rod base, and has a state of blocking the third port (C) and blocking the bypass valve port (E).

Preferably, the temperature sensing mechanical control valve comprises a large end and a small end disposed axially along a center of the push rod base, the big end is located at one end of the push rod base, and the large end has a third port blocked The status and the status of the bypass valve port.

Preferably, the valve chamber is divided into a large valve chamber and a small valve chamber at the bypass valve port (the large valve chamber provides communication between the first port and the third port, the small valve chamber provides a second port And a communication between the fourth port; the large and small valve chambers are continuous from the third port to the fourth port side of the large valve chamber to the inner wall of the small valve chamber, forming a guiding block for guiding the large end Opening a large valve chamber from the first port to the second port to the inner wall of the small valve from the bypass valve port to the center of the valve chamber to form a blocking block for the large end, the large end diameter is not less than small The diameter of the valve chamber, the height of the large end is not less than the inner diameter of the third port.

Preferably, the temperature sensing element in the temperature sensing mechanical control valve (24) is paraffin wax.

Preferably, the set temperature range is greater than 65 ° C and less than or equal to 75 V.

The present invention also provides an automatic transmission oil cooling system including a first circulation loop and a second circulation loop;

The first circulation circuit, the automatic transmission oil is returned to the automatic transmission through a cooling device connected to the cooling pipe;

In the second circulation loop, the automatic transmission oil is directly returned to the automatic transmission through the cooling pipeline; a first valve is disposed in the cooling pipeline of the first circulation loop to control the conduction and closure of the first circulation loop, A second valve is disposed in the cooling circuit of the second circulation circuit to control conduction and closing of the second circulation circuit.

The first valve and the second valve are temperature sensitive mechanical control valves integrated in the bypass valve.

Preferably, the cooling device is formed by connecting a water-cooled oil cooler and an air-cooled oil cooler in series.

Preferably, the cooling circuit is made of PA612 material.

Preferably, the cooling pipe joint adopts a push-in fitting.

The beneficial effects of the invention are:

The automatic transmission oil temperature controls the flow direction of the automatic transmission oil. The automatic transmission oil selectively flows through the large and small cooling cycles, so that the oil temperature is always within a reasonable oil temperature range, and the vehicle adapts to the tropical conditions. Also adapts to cold zone environmental conditions; two valves that control the automatic transmission oil circuit are integrated One end of the temperature-sensing mechanical control valve inside the bypass valve, the structure is simple, easy to implement, and the work efficiency is high; the automatic transmission oil cooling pipe is made of PA612 material, and the joint adopts a quick-connect joint, which is compared with the general oil cooling pipe. Metal + AEM material, cost reduction of 1/2, weight reduction of 3/4, and convenient assembly of the production line. DRAWINGS

1 is an automatic transmission oil cooling system in the prior art;

2 is another automatic transmission oil cooling system in the prior art;

3 is a schematic structural view of an automatic transmission oil cooling system of the present invention;

4 is a schematic view showing the internal structure of a bypass valve when only the second circulation loop is cooled according to an embodiment of the present invention; FIG. 5 is a schematic diagram showing the internal structure of the bypass valve when only the first circulation loop is cooled according to an embodiment of the present invention; Schematic diagram of the bypass valve body structure;

7 is a schematic structural view of a temperature sensing mechanical control valve inside a bypass valve according to an embodiment of the present invention. Symbol Description:

1 automatic transmission 213 closed end

2 Bypass valve 214 Large end face

21 valve cover 215 middle end face

22 push rod base 3 water-cooled oil cooler

23 push rod 4 air-cooled oil cooler

24 temperature sensing mechanical control valve A first port

25 return spring B second port

26 big end C third port

27 little end D fourth port

28 guide block E bypass valve port

29 blocking block VI first valve

210 large valve chamber V2 second valve

211 small valve chamber C1 first circulation circuit

212 open end C2 second circulation loop detailed description

The above described objects, features and advantages of the present invention will become more apparent from the aspects of the appended claims.

In the following description, numerous specific details are set forth in order to provide a full understanding of the present invention, but the invention may be practiced in other ways than those described herein, and those skilled in the art can do without departing from the scope of the invention. The invention is not limited by the specific embodiments disclosed below.

As described in the background above, two different forms of cooling system provided by the automatic transmission oil are shown in Figures 1 and 2: As shown in Figure 1, the automatic transmission 1 is sequentially connected to the water-cooled oil-cooled through the cooling line. The air conditioner 4 and the air-cooled oil cooler 4 form a series automatic oil transmission oil cooling circuit; as shown in Fig. 2, the automatic transmission 1 is connected to the water-cooled oil cooler 3 through a cooling pipe to form a cooling circuit.

The above two automatic transmission oil cooling systems require cooling of the automatic transmission oil under any conditions. At low temperatures, it is not desirable for the automatic transmission oil to be cooled at the beginning of the transmission operation. Problem, the present invention provides an automatic transmission oil cooling system including an automatic transmission oil passing through a cooling device connected to a cooling pipe, returning to a first circulation circuit C1 formed by the automatic transmission 1, and automatic transmission oil The cooling circuit directly returns to the second circulation circuit C2 formed by the automatic transmission 1; a first valve VI is disposed in the cooling circuit of the first circulation circuit C1 to control the conduction and the closing of the first circulation circuit C1, A second valve V2 is provided in the cooling circuit of the second circulation circuit C2 to control the conduction and closing of the second circulation circuit C2.

As shown in FIG. 3, in a specific embodiment, the automatic transmission oil cooling system includes: an automatic transmission 1, a bypass valve 2, a water-cooled oil cooler 3, an air-cooled oil cooler 4, and a cooling circuit; The cooler 3 and the air-cooled oil cooler 4 are connected in series by a cooling pipe to form a cooling device, and the automatic transmission 1 communicates with the cooling device through a cooling pipe to form a cooling cycle, and the cooling of the automatic transmission 1 and the cooling device is connected. A bypass valve 2 is disposed in the pipeline, and the bypass valve 2 is internally provided with a first valve VI and a second valve V2; when the first valve VI is opened and the second valve V2 is closed, the automatic transmission oil passes through the bypass valve 2 flowing through the above cooling device and returning to the automatic transmission 1 to form a first circulation circuit C1; when the first valve VI is closed and the second valve V2 is open, the automatic transmission oil is directly returned to the automatic transmission through the internal passage of the bypass valve 2 1 , forming a second circulation loop C2; the first valve VI and the second valve V2 is concentrated in the bypass valve 2, and the two valves are in a linked state, that is, the first valve VI is fully open, the second valve V2 is in a closed state, the second valve V2 is fully open, the first valve VI is in a closed state, and the first Both the valve VI and the second valve V2 are partially open.

In a more preferred embodiment, the first valve VI and the second valve V2 are temperature-sensing mechanical air valves 24 integrated in the bypass valve 2, as shown in Figures 4, 5, 6, and 7. As an embodiment of the bypass valve 2 described above, in the present embodiment, the bypass valve 2 includes a valve housing 21, a push rod base 22, a push rod 23, a temperature sensitive mechanical control valve 24, and a return spring 25.

The valve cover 21 has a columnar shape, and one end has an opening, which is an open end 212, and the other end is a closed end 213. Two sides of the valve cover 21 are respectively provided with two corresponding ports, wherein the first port A and the second port B are disposed at On the same side of the valve cover 21, the first port A is connected to the oil passage output port of the automatic transmission 1, the second port B is connected to the oil passage input port of the automatic transmission 1, and the third port C and the fourth port D are correspondingly arranged. On the other side of the valve cover 21, the third port C is connected to the cooling device oil passage input port, and the fourth port D is connected to the cooling device oil passage output port; the valve housing 21 internally forms a valve chamber, the valve chamber A bypass valve port E is provided, and the bypass valve port E divides the valve chamber into a large valve chamber 210 and a small valve chamber 211, and the inner wall of the large valve chamber 210 and the small valve chamber 211 is at the third port C to the fourth port D. - the side is continuous,

The inner wall of the B-side large valve chamber 210 extends to the inner wall of the small valve chamber 211 perpendicular to the central axial valve chamber of the valve housing 21 at the bypass valve port E, forming a blocking block 29 for blocking the temperature sensing machine control valve 24. .

The push rod base 22 is fixedly engaged with the valve cover 21 at the open end 212 to form a firm seal. The push rod 23 is mounted in the valve cover 21, one end is fixed on the push rod base 22, and the other end is along the central axial valve of the push rod base 22. The closed end 213 of the outer cover extends to a certain length.

The temperature sensing machine control valve 24 is a hollow columnar structure, and is divided into a large end 26 and a small end 27, and a large end 26 is formed with a circular hole at the center of the large end surface 214 of the push rod base 22, the circular hole The diameter matches the diameter of the push rod 23 for fitting the temperature sensing mechanical control valve 24 to the push rod 23, the small end 27 having a diameter larger than the diameter of the push rod 23 and smaller than the diameter of the small valve chamber 211 for the temperature sensing mechanical control valve When the sleeve 23 is set on the push rod 23, the push rod 23 can extend through the large end 26 into the small end 27, and the diameter of the large end 26 is not less than the diameter of the small valve chamber 211, forming the valve of the bypass valve port ,, and the height is not The diameter of the third port C on the valve cover 21 is smaller, forming a valve of the third port C; the temperature sensing mechanical control valve 24 is set on the push rod 23 and filled with paraffin, and the paraffin can be solidified or melted according to the temperature change. The volume changes, and the temperature-sensitive mechanical control valve 24 reciprocates in the axial direction of the push rod 23, and can control the opening and closing of the third port C and the bypass valve port E described above.

The return spring 25 is mounted in the valve cover 21, one end is connected to the closed end 213 of the valve cover, and the other end is connected to the intermediate end surface 215 of the large end 26 of the temperature sensor control valve 24 and the small end 27, and is set in the temperature sense control. On the small end 27 of the valve 24, the return spring 25 is axially pressurized between the temperature sensing machine control valve 24 and the closed end 213 of the valve housing to provide a restoring force to the temperature sensing mechanical control valve 24.

The above paraffin wax begins to melt into a liquid state at a temperature of 65 ° C, and expands at a volume between 65 ° C and 75 ° C, and reaches a maximum at 75 ° C.

The temperature sensing mechanical control valve 24 expands the paraffin volume filled inside the temperature sensing mechanical control valve 24 to a maximum value when the temperature is 75 ° C or higher, and presses the push rod 23 and extrudes the push rod 23 to a maximum value. The push rod 23 is fixed to the push rod base 22, the temperature sensitive mechanical control valve 24 moves in the opposite direction, the large end end surface 214 is separated from the push rod base 22, and the temperature sensitive mechanical control valve 24 extends along the other end of the center of the push rod base 22 To the maximum value, the intermediate end surface 215 of the large end 26 and the small end 27 is connected to the blocking block 29, the bypass valve port E is closed, and the third port C is opened, that is, the large valve chamber 210 is small. The passage between the valve chambers 211 is closed, the internal passages of the bypass valves of the first port A to the second port B are closed, the passages of the first port A to the third port C are communicated, and the automatic transmission oil passes through the first port A and the third port. The C passage is connected to the above-described cooling device and flows through the fourth port D and the second port B passage, and flows back to the automatic transmission 1 to form a first circulation loop.

When the temperature is less than or equal to 65 ° C, the temperature-sensitive mechanical control valve 24 solidifies the paraffin filled inside the temperature-sensitive mechanical control valve 24, the volume of the paraffin is reduced to a minimum value, and the return spring 25 is axially pressurized to the middle of the temperature-sensitive mechanical control valve 24 On the end surface 215, the large end surface 214 of the temperature sensitive mechanical air valve 24 is connected to the push 4 dry base 22, the third port C is closed, and the passage between the first port A and the third port C is closed. The valve port E is opened, and at this time, the passage between the large valve chamber 210 and the small valve chamber 211 is communicated, the first port A to the second port B are in communication, and the automatic transmission oil is recirculated through the internal passage of the bypass valve 2 to the automatic The gearbox 1 forms a second circulation loop.

When the temperature of the temperature-sensitive mechanical control valve 24 is greater than 65 ° C and less than 75 ° C, the paraffin filled inside the temperature-sensitive mechanical control valve 24 is liquid and the volume has not expanded to the maximum value, and the large end face 214 of the temperature-sensitive mechanical control valve 24 Separating from the push rod base 22 and extending along the other end of the central axis and not reaching a maximum value, that is, the intermediate end surface 215 of the temperature sensing mechanical control valve 24 is not yet connected to the blocking block 29, at this time, the automatic transmission oil At the same time, the first circulation loop C1 and the second circulation loop C2 are returned to the automatic transmission to form a double loop circuit. Although the invention has been disclosed above in the preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention by using the methods and technical contents disclosed above, or modify the equivalents of equivalent changes without departing from the scope of the technical solutions of the present invention. Example. Therefore, any modification, equivalent changes, and modifications made to the above embodiments in accordance with the technical spirit of the present invention are still within the scope of protection of the technical solutions of the present invention.

Claims

Rights request

1. A bypass valve, comprising: a valve cover (21), a push rod base (22), a push rod (23), a temperature sensitive mechanical control valve (24), a return spring (25);

a valve cover (21), the valve cover (21) forms a valve chamber having one end closed at the other end, and the push base (22) is fixedly connected and closed to the open end (212), the valve cover (21) Provided with a first port (A) connected to the automatic transmission (1) oil passage output port, a second port (B) connected to the automatic transmission (1) oil passage input port, and the cooling device a third port (C) to which the oil passage input port is connected, a fourth port (D) connected to the cooling device oil passage output port, the first port (A), the second port (B), and the first port The three ports (C) and the fourth port (D) are in communication with the valve chamber, and the first port (A) and the third port (C), the second port (B) and the fourth port (D) are respectively disposed correspondingly The valve housing (21) is provided on both sides; the valve chamber is further provided with a bypass valve port (E) for providing fluid communication between the first port (A) and the second port (B);

Mf (23) is installed in the valve cover (21), is fixed on the push base (22), and extends along the closed end of the valve cover (21) along the center axial direction of the push rod base (22);

The temperature sensing mechanical control valve (24) is placed on the push rod (23), the return spring (25) is mounted in the valve housing (21), and is axially pressurized to the temperature sensitive mechanical control valve (24) and the valve a closed end (213) of the outer cover (21);

Wherein, the temperature sensing mechanical control valve (24) is internally provided with a temperature sensing element whose volume changes with temperature; in the set temperature range, the temperature sensing mechanical control valve (24) is along the central axis of the push rod base (22) The reciprocating motion has a state of blocking the third port (C) and blocking the bypass valve port (E) state.

2. A bypass valve according to claim 1 wherein said temperature sensitive mechanical control valve (24) includes a large end (26) and a small end disposed axially along a central axis of said pusher base (22) (27), the big end (26) is located at the end of the push rod base (22), and the large end (26) has a state of blocking the third port (C) and blocking the bypass valve port ( E) Status.

3. The bypass valve according to claim 2, wherein the valve chamber is divided into a large valve chamber (210) and a small valve chamber (211) at a bypass valve port (E), the large valve chamber (210) providing communication between the first port (A) and the third port (C), the small valve chamber (211) providing communication between the second port (B) and the fourth port (D); The large and small valve chambers (210, 211) are at the third port (C) The inner wall of the fourth port (D) - the side large valve chamber (210) to the small valve chamber (211) is continuous, forming a guiding block (28) for guiding the large end (26), at the first port (A) to the second port (B), the large valve chamber (210) to the small valve chamber (211) inner wall extends from the bypass valve port (E) toward the center of the valve chamber to form the large end ( 26) A blocking block (29) having a diameter not less than a diameter of the small valve chamber (211), the height of the large end (26) being not less than an inner diameter of the third port (C).

The bypass valve according to any one of claims 1 to 3, characterized in that the temperature sensing element in the temperature sensing mechanical control valve (24) is paraffin wax.

The bypass valve according to claim 1, wherein the set temperature range is greater than 65 ° C and less than or equal to 75 ° C.

6. An automatic transmission oil cooling system comprising a first circulation loop (C1) and a second circulation loop (C2);

The first circulation circuit (C1), the automatic transmission oil is returned to the automatic transmission through a cooling device connected to the cooling pipe (1);

The second circulation circuit (C2), the automatic transmission oil is directly returned to the automatic transmission through the cooling pipe (1);

A first valve (VI) is disposed in the cooling circuit of the first circulation circuit (C1) to control conduction and closing of the first circulation circuit, and a cooling circuit is provided in the cooling circuit of the second circulation circuit (C2) Two valves (V2) to control the conduction and closing of the second circulation loop.

The first valve (VI) and the second valve (V2) are temperature-sensitive mechanical control valves (24) integrated in the bypass valve (2) according to any one of claims 1-5. ).

7. The automatic transmission oil cooling system according to claim 6, wherein the cooling device is formed by connecting a water-cooled oil cooler (3) and an air-cooled oil cooler (4) in series.

8. The automatic transmission oil cooling system according to claim 6, wherein the cooling circuit is made of PA612 material.

9. The automatic transmission oil cooling system according to claim 6, wherein the cooling line joint employs a push-in fitting.