Cooling system and cooling method

Abstract

The invention belongs to the technical field of transport vehicles. In order to solve the problem that an existing electric vehicle cannot cool a motor and a brake through a set of cooling system.The cooling system comprises a bridge body, a cooling pump, the motor and the brake, and the motor is provided with a first inlet and a first outlet; the brake comprises a shell, a friction plate set, a first piston, a spring, a valve element and a flow channel, a second inlet and a second outlet are formed in the shell, the outlet end of the cooling pump communicates with the first inlet and the second inlet, an overflow valve is arranged between the outlet end of the cooling pump and the first inlet, and the first outlet communicates with the inlet end of the cooling pump. The elastic coefficient of the spring and the opening pressure of the valve element are changed by moving the first piston, the motor and the brake are fully cooled through a set of cooling system, energy consumption is reduced, and cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of transport vehicles, and in particular relates to a cooling system and a cooling method. Background Art

[0002] Electric mining vehicles driven by motors generate a lot of heat when the motors or brakes are working, and usually require cooling liquid. To ensure that the motors and brakes are adequately cooled, the vehicles are usually equipped with two cooling liquids, one for cooling the motors and the other for cooling the friction plates inside the brakes. To facilitate flow diversion management, two cooling systems are usually set up. Since the motors and brakes basically do not work at the same time, the long-term use of two cooling systems to supply coolants leads to unnecessary energy consumption and increased costs. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a cooling system and a cooling method capable of cooling a motor and a brake through a cooling system.

[0004] A first aspect of the present invention provides a cooling system, including a bridge body, a cooling pump, a motor and a brake, wherein the motor is connected to the bridge body, a rotating half shaft is arranged in the bridge body, the brake is sleeved on the rotating half shaft, a first inlet and a first outlet are arranged on the motor, the brake includes a housing, a friction plate group, a first piston, a spring, a valve core and a flow channel, a second inlet and a second outlet are arranged on the housing, the outlet end of the cooling pump is communicated with the first inlet and the second inlet respectively, and a relief valve is arranged between the outlet end of the cooling pump and the first inlet, the first outlet is communicated with the inlet end of the cooling pump, the friction plate group is arranged in the housing, and the friction plate group is arranged on the side of the first piston away from the second inlet, the flow channel is opened in the interior of the first piston, the two ends of the valve core are respectively abutted with the second inlet and the first piston, and the valve core can reciprocate along the horizontal extension direction of the flow channel, the spring is arranged between the valve core and the first piston, and the second inlet is communicated with the second outlet through the valve core and the flow channel.

[0005] Optionally, a first slide groove is provided on the housing, the first slide groove is provided corresponding to the second inlet, and a second slide groove is provided on the first piston, the second slide groove is provided corresponding to the first slide groove;

[0006] The first chute and the second chute have the same width, and the widths of the first chute and the second chute are both greater than the width of the flow channel.

[0007] Optionally, a radial hole and a valve core conduit are provided on the valve core, and the valve core conduit is communicated with the second inlet through the radial hole, and the radial hole is communicated with the flow channel through the valve core conduit.

[0008] Optionally, a wheel hub is provided on the outer periphery of the bridge body, and a second piston is also provided inside the shell, a first slot is provided between the friction plate group and the shell, a second slot is provided between the friction plate group and the second piston, a third slot is provided between the friction plate group and the wheel hub, and the second inlet, the flow channel, the first slot, the second slot, the third slot and the second outlet are connected.

[0009] Optionally, the position of the second outlet is higher than the position of the second inlet.

[0010] Optionally, a first sealing member is provided between the valve core and the housing, and a second sealing member is provided between the valve core and the first piston.

[0011] A second aspect of the present invention provides a cooling method for a cooling system, which is implemented based on a cooling system as described in any one of the above, and comprises the following steps:

[0012] When the brake is working, the first piston moves toward the friction plate group, the spring is extended, the cooling pump delivers coolant into the brake through the second inlet, the coolant pushes the valve core to move toward the friction plate group, and the coolant is delivered to the second outlet through the flow channel;

[0013] When the brake stops working, the first piston moves toward the second inlet, the spring is compressed, the overflow valve opens, and the coolant enters the first inlet through the overflow valve.

[0014] Compared with the prior art, the technical solution provided by the embodiment of the present invention has the following beneficial effects:

[0015] The embodiment of the present invention provides a cooling system and a cooling method. The cooling system is provided with a cooling pump, and the outlet end of the cooling pump is divided into two branches. The coolant can enter the motor and the brake respectively through the two branches for cooling. The brake is provided with a first piston, a valve core and a spring. The elastic coefficient of the spring is changed by moving the first piston to change the elastic force of the spring, thereby changing the opening pressure of the valve core. When the brake is braked, the spring is extended. At this time, the opening pressure of the valve core is lower than the opening pressure of the overflow valve, so that the coolant only enters the brake, and the coolant flow channel of the brake is automatically opened during braking, so that the motor and the brake are fully cooled through a cooling system, thereby reducing energy consumption and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0018] Figure 1 A schematic diagram of the structure of a cooling system according to an embodiment of the present invention;

[0019] Figure 2 for Figure 1 A partial enlarged view of point A in the middle.

[0020] Among them, 1. bridge body; 2. cooling pump; 3. motor; 301. first inlet; 302. first outlet; 4. brake; 5. rotating half shaft; 6. housing; 601. second inlet; 602. second outlet; 7. friction plate group; 8. first piston; 9. second piston; 10. spring; 11. valve core; 12. flow channel; 13. overflow valve; 14. wheel hub; 15. first notch; 16. second notch; 17. third notch; 18. first seal; 19. second seal. DETAILED DESCRIPTION

[0021] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the scheme of the present invention will be further described below. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0022] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present invention, rather than all of the embodiments.

[0023] Reference Figure 1 and Figure 2As shown, the first aspect of this embodiment provides a cooling system, including a bridge body 1, a cooling pump 2, a motor 3 and a brake 4, the motor 3 is connected to the bridge body 1, a rotating half shaft 5 is arranged in the bridge body 1, the brake 4 is sleeved on the rotating half shaft 5, the motor 3 is provided with a first inlet 301 and a first outlet 302, the brake 4 includes a housing 6, a friction plate group 7, a first piston 8, a spring 10, a valve core 11 and a flow channel 12, the housing 6 is provided with a second inlet 601 and a second outlet 602, the outlet end of the cooling pump 2 is connected to the first inlet 301 and the second inlet 601 respectively, and the cooling pump 2 An overflow valve 13 is arranged between the outlet end and the first inlet 301, the first outlet 302 is connected with the inlet end of the cooling pump 2, the friction plate group 7 is arranged in the housing 6, and the friction plate group 7 is arranged on the side of the first piston 8 away from the second inlet 601, the flow channel 12 is opened inside the first piston 8, the two ends of the valve core 11 are respectively abutted against the second inlet 601 and the first piston 8, and the valve core 11 can reciprocate along the horizontal extension direction of the flow channel 12, the spring 10 is arranged between the valve core 11 and the first piston 8, and the second inlet 601 is connected with the second outlet 602 through the valve core 11 and the flow channel 12.

[0024] Specifically, existing vehicles are usually provided with two cooling systems, that is, two cooling pumps are used to cool the friction plates inside the motor and the brake respectively. However, the motor and the brake basically do not work at the same time. Long-term use of two cooling systems to supply coolant will lead to energy consumption and increased costs. The present embodiment provides a cooling system, which provides a cooling pump 2 to supply coolant to the motor 3 and the brake 4. When the brake 4 is working, the first piston 8 moves to the right, so that the spring 10 is extended, and the elastic coefficient of the spring 10 is reduced, so that the opening pressure of the valve core 11 is lower than the opening pressure of the overflow valve 13. The coolant enters the brake 4 through the second inlet 601 and can push the valve core 11 to move to the right. The coolant enters the flow channel 12 and flows out from the second outlet 602, thereby realizing the cooling of the coolant. The friction plate group 7 in the brake 4 is compressed when the brake 4 is not working. The elastic coefficient of the spring 10 is relatively large, so that the opening pressure at the valve core 11 is greater than the opening pressure at the relief valve 13, so that the coolant is output by the cooling pump 2 and enters the first inlet 301 of the motor 3 through the relief valve 13 to cool the motor 3. That is to say, this cooling system changes the elastic coefficient of the spring 10 by moving the first piston 8, thereby changing the opening pressure of the valve core 11. When the spring 10 is extended, the opening pressure of the valve core 11 is lower than the opening pressure of the relief valve 13, so that the coolant flow channel of the brake 4 can be automatically opened during braking, thereby achieving sufficient cooling of the motor 3 and the brake 4 through a set of cooling system, reducing energy consumption and reducing costs.

[0025] Further, see Figure 2As shown, the housing 6 is provided with a first slide groove, which is provided corresponding to the second inlet 601, and the first piston 8 is provided with a second slide groove, which is provided corresponding to the first slide groove; the widths of the first slide groove and the second slide groove are the same, and the widths of the first slide groove and the second slide groove are both greater than the width of the flow channel 12. Specifically, the two ends of the first piston 8 are respectively placed in the first slide groove and the second slide groove, and the first piston 8 can reciprocate in the first slide groove and the second slide groove, and the widths of the first slide groove and the second slide groove are both greater than the width of the flow channel 12, that is, a step surface is formed at the connection between the second slide groove and the flow channel 12, so that the spring 10 can abut against the step surface, and when the first piston 8 moves, the spring 10 can achieve effective expansion and contraction.

[0026] In order to ensure that the coolant can enter the flow channel 12 from the second inlet 601, radial small holes and a valve core conduit are provided on the valve core 11, and the valve core conduit is connected to the second inlet 601 through the radial small holes, and the radial small holes are connected to the flow channel 12 through the valve core conduit. Specifically, the second inlet 601, the radial small holes, the valve core conduit and the flow channel 12 are connected. The radial small holes have a small diameter, so that the flow rate of the coolant entering the valve core 11 is reduced, thereby playing a role in stabilizing the pressure. The valve core conduit is used to guide and regulate the flow of the coolant to ensure the normal operation of the cooling system. At the same time, the radial small holes and the valve core conduit are conducive to heat dissipation inside the brake, preventing the vehicle brake system from losing its effectiveness due to excessive temperature, and can also suppress brake noise, making the braking process more stable.

[0027] To further ensure that the coolant can cool the friction plate group 7, a wheel hub 14 is provided on the outer periphery of the bridge body 1, and a second piston 9 is also provided inside the shell 6. The second piston 9 is in an open state when the vehicle is driving normally. A first slot 15 is provided between the friction plate group 7 and the shell 6, a second slot 16 is provided between the friction plate group 7 and the second piston 9, and a third slot 17 is provided between the friction plate group 7 and the wheel hub 14. The second inlet 601, the flow channel 12, the first slot 15, the second slot 16, the third slot 17 and the second outlet 602 are connected. That is to say, the first slot 15, the second slot 16 and the third slot 17 are provided on the outer periphery of the friction plate group 7. The coolant enters the flow channel 12 through the second inlet 601, and then flows out from the second outlet 602 through the first slot 15, the second slot 16 and the third slot 17, thereby realizing the cooling of the friction plate group 7.

[0028] In some embodiments, the position of the second outlet 602 is higher than the position of the second inlet 601, that is, the coolant return port of the brake 4 is at a high position. When the brake 4 is not working, the second inlet 601 is closed. At this time, the inside of the brake 4 is full of oil and is in a low-pressure state, which is conducive to exhausting the inside of the brake 4, ensuring the sensitivity and reliability of the braking system, and at the same time avoiding damage to the floating sealed bearing due to lack of oil or high pressure.

[0029] To ensure the sealing of the brake 4 , a first sealing member 18 is provided between the valve core 11 and the housing 6 , and a second sealing member 19 is provided between the valve core 11 and the first piston 8 .

[0030] A second aspect of the present embodiment provides a cooling method for a cooling system, which is implemented based on the above cooling system and specifically includes the following steps:

[0031] When the brake 4 is working, the first piston 8 moves toward the friction plate group 7, and at the same time drives the spring 10 to extend, the elastic coefficient of the spring 10 decreases, and its elastic force decreases, so that the opening pressure of the valve core 11 is lower than the opening pressure of the relief valve 13, and the coolant enters the brake 4 through the second inlet 601, and can push the valve core 11 to move toward the friction plate group 7. The coolant enters the flow channel 12 through the radial small holes and the valve core conduit, and then flows out from the second outlet 602 through the first notch 15, the second notch 16 and the third notch 17, so that the coolant cools the friction plate group 7 in the brake 4; when the brake 4 stops working, the first piston 8 moves toward the second inlet 601, at this time the spring 10 is in a compressed state, the elastic coefficient of the spring 10 is large, and its elastic force increases, so that the opening pressure at the valve core 11 is greater than the opening pressure at the relief valve 13, at this time the relief valve 13 is opened, and the coolant is output by the cooling pump 2, and enters the first inlet 301 of the motor 3 through the relief valve 13, so as to cool the motor 3.

[0032] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0033] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments described herein, but should conform to the widest scope consistent with the principles and novel features invented herein.

Claims

1. A cooling system, characterized in that: The invention comprises a bridge body (1), a cooling pump (2), a motor (3) and a brake (4), wherein the motor (3) is connected to the bridge body (1), a rotating half shaft (5) is arranged in the bridge body (1), the brake (4) is sleeved on the rotating half shaft (5), the motor (3) is provided with a first inlet (301) and a first outlet (302), the brake (4) comprises a housing (6), a friction plate group (7), a first piston (8), a spring (10), a valve core (11) and a flow channel (12), the housing (6) is provided with a second inlet (601) and a second outlet (602), the outlet end of the cooling pump (2) is respectively connected to the first inlet (301) and the second inlet (601), and the outlet end of the cooling pump (2) is connected to the first inlet (301). An overflow valve (13) is provided, the first outlet (302) is connected to the inlet end of the cooling pump (2), the friction plate group (7) is arranged in the housing (6), and the friction plate group (7) is arranged on the side of the first piston (8) away from the second inlet (601), the flow channel (12) is opened inside the first piston (8), the two ends of the valve core (11) are respectively in contact with the second inlet (601) and the first piston (8), and the valve core (11) can reciprocate along the horizontal extension direction of the flow channel (12), the spring (10) is arranged between the valve core (11) and the first piston (8), and the second inlet (601) is connected to the second outlet (602) through the valve core (11) and the flow channel (12).

2. A cooling system according to claim 1, characterized in that: The housing (6) is provided with a first slide groove, the first slide groove is provided corresponding to the second inlet (601), and the first piston (8) is provided with a second slide groove, the second slide groove is provided corresponding to the first slide groove; The widths of the first chute and the second chute are the same, and the widths of the first chute and the second chute are both greater than the width of the flow channel (12).

3. A cooling system according to claim 1, characterized in that: The valve core (11) is provided with radial small holes and a valve core conduit, and the valve core conduit is connected to the second inlet (601) through the radial small holes, and the radial small holes are connected to the flow channel (12) through the valve core conduit.

4. A cooling system according to claim 1, characterized in that: The outer periphery of the bridge body (1) is provided with a wheel hub (14), and a second piston (9) is also provided inside the shell (6). A first notch (15) is provided between the friction plate group (7) and the shell (6), a second notch (16) is provided between the friction plate group (7) and the second piston (9), and a third notch (17) is provided between the friction plate group (7) and the wheel hub (14), and the second inlet (601), the flow channel (12), the first notch (15), the second notch (16), the third notch (17) and the second outlet (602) are connected.

5. A cooling system according to claim 1, characterized in that: The position of the second outlet (602) is higher than the position of the second inlet (601).

6. A cooling system according to claim 1, characterized in that: A first sealing member (18) is provided between the valve core (11) and the housing (6), and a second sealing member (19) is provided between the valve core (11) and the first piston (8).

7. A cooling method for a cooling system, based on a cooling system according to any one of claims 1 to 6, characterized in that: The following steps are involved: When the brake (4) is working, the first piston (8) moves toward the friction plate group (7), the spring (10) stretches, the cooling pump (2) delivers cooling liquid into the brake (4) through the second inlet (601), the cooling liquid pushes the valve core (11) to move toward the friction plate group (7), and the cooling liquid is delivered to the second outlet (602) through the flow channel (12); When the brake (4) stops working, the first piston (8) moves toward the second inlet (601), the spring (10) is compressed, the overflow valve (13) opens, and the coolant enters the first inlet (301) through the overflow valve (13).

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