Hydraulic coupling fan rotating speed adjusting and controlling device for diesel engine

Abstract

The hydraulic coupling fan rotating speed adjusting and controlling device for the diesel engine comprises a body and a two-position three-way electromagnetic valve, and a first plunger cavity and a second plunger cavity are formed in the body; the two plunger cavities are divided into a plurality of cavities and are provided with oil channels communicated with the cavities. The hydraulic coupler is compact in structural design, the mechanical control mode that the self-operated temperature control valve element is in linkage with the plunger through the working characteristics of the self-operated temperature control valve element is achieved, the mode of control through the electromagnetic valve is also achieved, the mechanical control mode and the mode are in redundancy design, and control over the flow of engine oil entering the hydraulic coupler is more flexible and reliable.

Description

Technical Field

[0001] The invention belongs to the technical field of diesel engines, and in particular relates to a hydraulic coupling fan speed regulating and controlling device for a diesel engine. Background Art

[0002] The fan is installed at the free end of the diesel engine and is driven by gears or belts to meet the heat dissipation requirements of the circulating cooling water. During the operation of the diesel engine, the circulating cooling water temperature is too high or too low, which is not conducive to the operation of the whole machine and consumes the total power of the diesel engine. Therefore, a fan speed adjustment control device is required to adjust the fan speed according to the water temperature, reduce the total amount of fan drive power consumption, and achieve the purpose of energy saving. Summary of the invention

[0003] In view of the problems existing in the prior art, the present invention provides the following technical solutions:

[0004] A hydraulically coupled fan speed regulating and controlling device for a diesel engine comprises a body and a two-position three-way solenoid valve fixed on the body, wherein a first plunger cavity and a second plunger cavity are provided inside the body;

[0005] A first plunger is provided in the first plunger cavity and is sealed and slidably matched with the first plunger cavity. A self-operated temperature control valve core is sealed and fixed at the cavity opening of the first plunger cavity directly below the first plunger. The temperature sensing portion of the lower part of the self-operated temperature control valve core protrudes downward from the body, and the top end of the lifting portion can drive the first plunger to rise by abutting against the top. A first return spring is also provided between the plug disc of the first plunger and the top wall of the first plunger cavity.

[0006] The first plunger cavity is divided by the first plunger to form a fourth cavity and a first cavity located at the upper and lower parts respectively, and an oil hole connecting the fourth cavity and the first cavity is provided on the first plunger disk; a second cavity and a third cavity which can be raised and lowered synchronously with the first plunger are also constructed between the peripheral side wall of the first plunger and the cavity wall of the first plunger cavity;

[0007] The second plunger cavity is provided with a control plunger and a second plunger arranged at intervals in upper and lower positions and slidingly sealingly matched therewith, a second threaded pin is coaxially fixed and protrudes from the plug disc of the second plunger, and the top end of the second threaded pin abuts against the lower surface of the plug disc of the control plunger; a second return spring is provided between the plug disc of the second plunger and the bottom wall of the second plunger cavity;

[0008] The second plunger cavity is divided by the second plunger and the control plunger to form: a fifth cavity between the bottom of the second plunger cavity and the second plunger, a seventh cavity between the second plunger and the control plunger; an eighth cavity between the control plunger and the end cover sealed and fixed at the top of the second plunger cavity; and a sixth cavity that can rise and fall synchronously with the second plunger is formed between the peripheral side wall of the second plunger and the second plunger cavity;

[0009] The main body has:

[0010] An oil inlet communicated with the second chamber;

[0011] An oil return port, which is in communication with the first chamber;

[0012] an oil outlet, which is connected to one end of the fifth oil passage;

[0013] A first oil passage, one end of which is connected to the first chamber, and the other end of which is connected to the fifth chamber;

[0014] A second oil passage, one end of which is connected to the first chamber; the other end of the second oil passage is connected to the sixth chamber;

[0015] A third oil passage, one end of which is interconnected with the second oil passage, and the other end of which is interconnected with one end of the adjustable connecting hole, and the other end of the adjustable connecting hole is interconnected with the fifth oil passage, and the flow rate of the adjustable connecting hole is limited and adjusted by a needle valve installed on the body;

[0016] A fourth oil passage, one end of which is opened and connected to the third chamber when the first plunger is at a low position; when the first plunger is raised to a high position, the end of the opening is disconnected from the third chamber and connected to the second chamber instead; the other end of the fourth oil passage remains connected to the seventh chamber;

[0017] A fifth oil passage, one end opening of which is blocked by the second plunger when the second plunger is in a high position, and the end opening can be connected to the sixth chamber when the second plunger is lowered to a low position;

[0018] A sixth oil passage, one end of which is interconnected with the second oil passage, and the other end of which is connected to the P port of the solenoid valve;

[0019] An end cover oil passage, one end of which is connected to port A of the solenoid valve, and the other end of which is connected to the eighth chamber;

[0020] The T port of the solenoid valve is connected to the fourth chamber via a pipeline.

[0021] Furthermore, an annular first sealing shoulder, a first annular groove, a second sealing shoulder, a second annular groove and a third sealing shoulder are formed in sequence from bottom to top on the circumferential side wall of the first plunger, and the first, second and third sealing shoulders are slidably sealed in cooperation with the side wall of the first plunger cavity, so that the first annular groove and the second annular groove between the first plunger and the first plunger cavity respectively constitute an annular and sealed second chamber and a third chamber which can move synchronously axially with the first plunger.

[0022] Furthermore, a communication port is provided at the top end of the peripheral side wall of the first plunger, and the third chamber is connected to the fourth chamber through the communication port.

[0023] Furthermore, an annular fourth sealing shoulder, a third annular groove and a fifth sealing shoulder are formed in sequence from bottom to top on the circumferential side wall of the second plunger. The fourth sealing shoulder and the fifth sealing shoulder are respectively slidably sealed with the side wall of the second plunger cavity, so that the third annular groove between the second plunger and the second plunger cavity forms an annular and sealed sixth chamber that can move synchronously with the second plunger in the axial direction.

[0024] Furthermore, the axes of the first plunger cavity and the second plunger cavity are parallel to each other.

[0025] Furthermore, the axis lines of the control plunger and the second plunger are collinear.

[0026] Furthermore, the second threaded pin is screwed into the pin hole of the second plunger disk and the position is locked by tightening the nut.

[0027] Furthermore, the self-operated temperature control valve core is coaxial with the first plunger; the lifting part of the self-operated temperature control valve core extends into the first plunger cavity and the top end abuts against the bottom end of the first threaded pin, the first threaded pin is screwed onto the plug disc of the first plunger, and the position is locked by tightening the nut.

[0028] A diesel engine comprises the hydraulic coupling fan speed regulating and controlling device for the diesel engine as described above.

[0029] A vehicle comprises the diesel engine as described above.

[0030] The present invention has a compact structure and has both a mechanical control mode that utilizes the working characteristics of the self-powered temperature control valve core to link it with the plunger, and a mode controlled by a solenoid valve. Both are redundant designs, and the control of the oil flow entering the hydraulic coupling is more flexible and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings that constitute a part of the present invention are used to provide further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 It is a three-dimensional schematic diagram of the present invention;

[0033] Figure 2 It is a front view schematic diagram of the present invention;

[0034] Figure 3 for Figure 2 AA section view in FIG.

[0035] Figure 4 for Figure 2 BB section diagram in FIG.

[0036] Figure 5 for Figure 2 The CC section diagram in FIG.

[0037] Figure 6 It is a side view schematic diagram of the present invention;

[0038] Figure 7 for Figure 6 DD section diagram in FIG.

[0039] Figure 8 is a three-dimensional schematic diagram of a first plunger;

[0040] Fig. 9 It is a three-dimensional schematic diagram of the second plunger.

[0041] Reference numerals in the figure: body 1; first plunger cavity 11; second plunger cavity 12; first chamber 111; second chamber 112; third chamber 113; fourth chamber 114; fifth chamber 125; sixth chamber 126; seventh chamber 127; eighth chamber 128;

[0042] Oil inlet 21; oil return port 22; oil outlet 23;

[0043] Self-operated temperature control valve core 3; temperature sensing part 31; lifting part 32;

[0044] First plunger 4; plug disc 41; first annular groove 42; second annular groove 43; first return spring 44; first threaded pin 45; fastening nut 46; first sealing shoulder 401; second sealing shoulder 402; third sealing shoulder 403; communication port 431;

[0045] The second plunger 5; the plug disc 51; the third annular groove 52; the second return spring 54; the second threaded pin 55; the fastening nut 56; the fourth sealing shoulder 501; the fifth sealing shoulder 502; the pin hole 510;

[0046] First oil passage 61; second oil passage 62; third oil passage 63; fourth oil passage 64; fifth oil passage 65; sixth oil passage 66; adjustable connecting hole 635;

[0047] Needle valve 7;

[0048] Solenoid valve 8; pipeline 81;

[0049] Control plunger 91; end cover 92; end cover oil passage 921. DETAILED DESCRIPTION

[0050] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0051] In the description of the embodiments of the present invention, it should be noted that the indicated orientation or position relationship is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the application product is usually placed when in use, or is the orientation or position relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present invention or simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operate in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0052] The term "plurality" in the present invention refers to more than two (including two). The terms "first", "second", etc. are only used to distinguish and describe, and should not be understood as indicating or implying relative importance.

[0053] Unless otherwise clearly specified and limited, the terms "setting", "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0054] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0055] As shown in the figure, the present invention comprises a body 1, a first plunger cavity 11 and a second plunger cavity 12 are formed inside the body 1, and the axis lines of the two plunger cavities (11, 12) are parallel to each other;

[0056] A first plunger 4 with a sliding seal is provided in the first plunger cavity 11, and a self-operated temperature control valve core 3 is sealed and fixed at the cavity mouth of the first plunger cavity 11 directly below the first plunger 4. The self-operated temperature control valve core 3 and the first plunger 4 are coaxial, and a temperature sensing portion 31 at the lower portion of the self-operated temperature control valve core 3 protrudes downward from the main body 1, which is used to extend into and detect the circulating water temperature of the hydraulically coupled fan, and a lifting portion 32 at the upper portion of the self-operated temperature control valve core 3 extends into the first plunger cavity 11, and the top end of the lifting portion 32 abuts against the bottom end of the first threaded pin 45, and the first threaded pin 45 is coaxially fixed to the plug disc 41 of the first plunger 4; preferably, the first threaded pin 45 is screwed on the plug disc 41 of the first plunger 4 to facilitate adjustment of its axial protruding position from the plug disc 41, and the position is locked by a tightening nut 46.

[0057] A first return spring 44 is further sandwiched between the plug disc 41 of the first plunger 4 and the top wall of the first plunger cavity 11;

[0058] A control plunger 91 and a second plunger 5 with sliding seals are provided in sequence from top to bottom in the second plunger cavity 12 along its axial line, and the axial lines of the control plunger 91 and the second plunger 5 are collinear; the second threaded pin 55 is coaxially fixed and protrudes from the plug disc of the second plunger 5, and the top end of the second threaded pin 55 abuts against the lower surface of the plug disc 51 of the control plunger 91; a second return spring 64 abuts between the lower surface of the plug disc 51 of the second plunger 5 and the bottom wall of the second plunger cavity 12; preferably, the second threaded pin 55 is screwed into the pin hole 510 of the plug disc 51 of the second plunger 5 to facilitate adjustment of its axial protruding position from the plug disc 51, and the position is locked by tightening the nut 56.

[0059] The first plunger cavity 11 is divided by the first plunger 4 to form a fourth chamber 114 and a first chamber 111 located at the upper and lower parts respectively. An oil hole 411 is provided on the plug disk 41 of the first plunger 4 to connect the fourth chamber 114 and the first chamber 111. Preferably, two oil holes 411 are provided on the plug disk 41 of the first plunger 4, which are symmetrically located on both sides of the first threaded pin 45.

[0060] Combination Figure 3 and Figure 8 As shown, an annular first sealing shoulder 401, a first annular groove 42, a second sealing shoulder 402, a second annular groove 43 and a third sealing shoulder 403 are formed in sequence from bottom to top on the circumferential side wall of the first plunger 4. The first sealing shoulder 401, the second sealing shoulder 402 and the third sealing shoulder 403 are slidably sealed with the side wall of the first plunger cavity 11, so that the first annular groove 42 and the second annular groove 43 between the first plunger 4 and the first plunger cavity 11 respectively constitute the second chamber 112 and the third chamber 113 which are annular and sealed and can move synchronously with the first plunger 4 in the axial direction; a connecting port 431 is also provided at the top end of the circumferential side wall of the first plunger 4, and the third chamber 113 formed by the second annular groove 43 is connected with the fourth chamber 114 through the connecting port 431.

[0061] Combination Figure 3 and Fig. 9 As shown, the annular fourth sealing shoulder 501, the third annular groove 52 and the fifth sealing shoulder 502 are sequentially formed on the peripheral side wall of the second plunger 5 from bottom to top, and the fourth sealing shoulder 501 and the fifth sealing shoulder 502 are respectively slidably sealed with the side wall of the second plunger cavity 12, so that the third annular groove 52 between the second plunger 5 and the second plunger cavity 12 forms an annular and sealed sixth chamber 126 that can move synchronously with the second plunger 5 in the axial direction.

[0062] A concave middle groove is formed in the middle of the upper surface of the plug disc of the control plunger 91, and the top cavity opening of the second plunger cavity 12 is sealed by an end cover 92 fixedly connected to the body bolts. The upper surface of the plug disc of the control plunger 91 can be abutted against the lower surface of the end cover 92 to limit the rise and escape of the control plunger 91, and an eighth chamber 128 is formed between the middle groove and the lower surface of the end cover 92, and the volume of the eighth chamber 128 decreases and increases with the rise and fall of the control plunger 91.

[0063] The second plunger cavity 12 is further divided by the second plunger 5 and the control plunger 91 to form: a fifth chamber 125 located between the bottom of the second plunger cavity 12 and the second plunger 5, and a seventh chamber 127 located between the second plunger 5 and the control plunger 91. The volume of the fifth chamber 125 increases and decreases with the rise and fall of the second plunger 5, and the height of the seventh chamber 127 does not change due to the restriction of the second threaded pin 55, but the seventh chamber 127 as a whole can rise and fall together with the second plunger 5 and the control plunger 91.

[0064] The body 1 is also provided with an oil inlet 21, an oil return port 22, an oil outlet 23, a first oil passage 61, a second oil passage 62, a third oil passage 63, a fourth oil passage 64, a fifth oil passage 65, a sixth oil passage 66 and an end cover oil passage 921, and the layout structures of the oil passages are respectively:

[0065] The oil inlet 21 is always connected to the second chamber 112;

[0066] The oil return port 22 is always connected to the first chamber 111;

[0067] The oil outlet 23 is connected to one end of the fifth oil passage 65;

[0068] One end opening of the first oil channel 61 is located on the cavity wall of the first plunger cavity 11 and is always connected to the first chamber 111. More specifically, when the first plunger 4 is in a low position, the end opening is opened under the first plunger and is still connected to the first chamber 111; the other end opening of the first oil channel 61 is located on the cavity wall of the second plunger cavity 12 and is always connected to the fifth chamber 125, ensuring smooth oil return and preventing the oil in the fifth chamber 125 from affecting the descent of the second plunger.

[0069] One end opening of the second oil passage 62 is located on the wall of the first plunger cavity 11 and is always connected to the first chamber 111; the other end opening of the second oil passage 62 is located on the wall of the second plunger cavity 12 and is always connected to the sixth chamber 126;

[0070] One end of the third oil channel 63 is interconnected with the second oil channel 62, and the other end is interconnected with one end of the adjustable connecting hole 635. The other end of the adjustable connecting hole 635 is interconnected with the middle part of the fifth oil channel 65. The hole flow rate of the adjustable connecting hole 635 is limited and adjusted by the needle valve 7 installed on the body. Specifically, the conical needle tip of the needle valve 7 is inserted into the adjustable connecting hole 635 and is coaxial with its hole axis. The needle valve is rotated to adjust the length of the needle tip extending into the adjustable connecting hole 635, thereby adjusting the size of the annular gap between the needle tip and the hole wall of the adjustable connecting hole 635 to achieve the size of the effective flow rate flowing through the adjustable connecting hole 635. The structure is simple and the effect is reliable.

[0071] Combination Figure 4 As shown, one end opening of the fourth oil passage 64 is located on the wall of the first plunger cavity 11, and when the first plunger 4 is in a low position, the end opening is connected to the third chamber 113; when the first plunger 4 rises to a high position, the end opening is disconnected from the third chamber 113 and connected to the second chamber 112 (at this time, the second chamber 112 is also connected to the corresponding end opening of the second oil passage 62). The other end opening of the fourth oil passage 64 is located on the wall of the second plunger cavity 12, and the end opening is always connected to the seventh chamber 127.

[0072] One end opening of the fifth oil passage 65 is located on the wall of the second plunger chamber 12, and when the second plunger 5 is in a high position, the end opening is blocked by the second plunger 5, and when the second plunger 5 drops to a low position, the end opening can be connected to the sixth chamber 126 (at this time, the sixth chamber 126 is also connected to the corresponding end opening of the second oil passage 62). The other end opening of the fifth oil passage 65 is located on the outer surface of the body and connected to the oil outlet 23. The oil outlet 23 supplies oil to the hydraulic coupling fan.

[0073] One end of the sixth oil passage 66 is interconnected with the second oil passage 62, and the other end is connected to the P port of the two-position three-way solenoid valve 8 fixed on the body 1;

[0074] One end of the end cover oil passage 921 is connected to the A port of the solenoid valve 8, and the other end is connected to the eighth chamber 128. Preferably, in order to save volume and facilitate processing, an oil passage groove is formed on the bottom surface of the end cover 92, and the oil passage groove is sealed and fixed on the body 1 through the end cover 92 to form the end cover oil passage 921.

[0075] The T port of the solenoid valve 8 is connected to the fourth chamber 114 via the pipeline 81 .

[0076] Working principle:

[0077] The temperature sensing part 3 of the self-operated temperature control valve core 3 of the device extends into the cooling water of the diesel engine. When the cooling water temperature does not reach 80°C, the lifting part 32 of the self-operated temperature control valve core 3 will not move upward, and the first plunger 4 will not move upward while keeping the low position. At this time, the engine oil enters the second chamber 112 through the oil inlet 21, and then flows into the second oil passage 62 after being opened.

[0078] ① The third oil passage 63 → needle valve 7 + adjustable connecting hole 635 → the fifth oil passage 65 → the oil outlet hole (23) to enter the hydraulic coupling device; this passage is always open and plays a role in lubricating the hydraulic coupling device when it rotates;

[0079] ② The second oil passage 62 → the sixth chamber 126. At this time, the oil in the sixth chamber 126 does not circulate;

[0080] ③ The sixth oil passage 66 → the P port of the solenoid valve 8. The solenoid valve 8 is a two-position three-way solenoid valve. When no power is supplied, PA is disconnected (i.e., the sixth oil passage 66 is disconnected from the end cover oil passage 921 of the A port), and this passage is closed, and the engine oil does not circulate; TA is connected, i.e., the end cover oil passage 921 of the A port is connected to the pipeline 81 of the T port;

[0081] When the cooling water temperature of the diesel engine reaches 80°C, the lifting part 32 of the self-operated temperature control valve core 3 moves upward, and drives the first plunger 4 to move upward synchronously through the first threaded pin 46. At this time, the synchronously rising second chamber 112 is connected to the fourth oil channel 64. At this time, the engine oil enters the second chamber 112 through the oil inlet 21, and the engine oil enters the second chamber 112 respectively:

[0082] ① The oil flows through the second oil passage 62 to the third oil passage 63 → needle valve 7 + adjustable connecting hole 635 → fifth oil passage 65 → oil outlet hole 23 and enters the hydraulic coupling device. This passage is always open and plays a role in lubricating the hydraulic coupling device when it rotates;

[0083] ② The fourth oil passage 64 → the seventh chamber 127, the second plunger 5 moves downward under the action of the oil in the seventh chamber 127, and the second return spring 54 is in a compressed state. At this time, the sixth chamber 126 that descends synchronously with the second plunger 5 connects the second oil passage 62 and the fifth oil passage 65, increasing the amount of oil flowing out of the oil outlet. The oil enters the hydraulic coupling device through the oil outlet 23. At this time, the fan speed increases, achieving the effect of cooling the circulating water of the diesel engine;

[0084] The above is a mechanical control using the upward displacement of the lifting part 32 of the self-operated temperature control valve core 3 as input. If the self-operated temperature control valve core 3 fails, the present invention also has a redundant design for the solenoid valve 8 control, using a temperature sensor (not shown in the figure) to monitor the cooling water temperature of the diesel engine as a signal, and giving a signal to the solenoid valve through the upper layer to make it work. Both mechanical control and solenoid valve control are redundant designs. Specifically, when the temperature sensor (not shown in the figure) monitors that the cooling water temperature of the diesel engine reaches 80°C, the solenoid valve 8 is energized, PA is connected, AT is disconnected, and because the self-operated temperature control valve core 3 fails, the first plunger 4 is still in a low position and does not change, and the engine oil enters the second chamber 112 through the oil inlet 21, and is diverted into the second oil channel 62 after opening:

[0085] The sixth oil passage 66 → the P port of the solenoid valve 8 → the A port of the solenoid valve 8 → the end cover oil passage 921 → the eighth chamber 128 above the control plunger 91, so that the control plunger 91 moves downward, and the second plunger 5 is driven downward by the second threaded pin 55 and the fastening nut 56. The second return spring 54 is in a compressed state. At this time, the sixth chamber 126 connects the second oil passage 62 and the fifth oil passage 65, and also increases the amount of oil entering the hydraulic coupling device from the oil outlet 23. At this time, the fan speed is increased to achieve the effect of cooling the circulating water of the diesel engine.

[0086] When the cooling water temperature of the diesel engine drops, the solenoid valve 8 is de-energized, the solenoid valve AT is connected, and the second return spring 54 drives the second plunger 5 and the control piston 91 to rise. At this time, the oil in the eighth chamber 128 above the control piston passes through the solenoid valve A port → solenoid valve T port → pipeline 81 → fourth chamber 114 → oil hole 411 → first chamber 111 → oil return port 22, and is discharged and returned smoothly.

[0087] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A hydraulically coupled fan speed regulating control device for a diesel engine, characterized in that: It comprises a body (1) and a two-position three-way solenoid valve (8) fixed on the body, wherein a first plunger cavity (11) and a second plunger cavity (12) are provided inside the body; A first plunger (4) is provided in the first plunger cavity and is in sealing and sliding cooperation with the first plunger cavity. A self-operated temperature control valve core (3) is sealed and fixed at the opening of the first plunger cavity directly below the first plunger. The temperature sensing portion (31) at the lower part of the self-operated temperature control valve core protrudes downward from the body. The top end of the lifting portion (32) can drive the first plunger to rise by abutting against the top. A first return spring (44) is also provided between the plug disc of the first plunger and the top wall of the first plunger cavity. The first plunger cavity is divided by the first plunger to form a fourth cavity (114) and a first cavity (111) located at the upper and lower parts respectively; an oil hole (411) connecting the fourth cavity and the first cavity is provided on the first plunger disk (41); a second cavity (112) and a third cavity (113) which can be raised and lowered synchronously with the first plunger are also constructed between the peripheral side wall of the first plunger and the cavity wall of the first plunger cavity; The second plunger cavity is provided with a control plunger (91) and a second plunger (5) arranged in an upper and lower spaced relationship and slidingly sealingly matched therewith; a second threaded pin (55) is coaxially fixed and protrudes from the plug disc of the second plunger (5), and the top end of the second threaded pin (55) abuts against the lower surface of the plug disc of the control plunger (91); a second return spring (64) is provided between the plug disc of the second plunger and the bottom wall of the second plunger cavity; The second plunger cavity (12) is divided by the second plunger and the control plunger to form: a fifth cavity (125) located between the bottom of the second plunger cavity and the second plunger, a seventh cavity (127) located between the second plunger and the control plunger; an eighth cavity (128) located between the control plunger (91) and an end cover (92) sealed and fixed at the top of the second plunger cavity (12); and a sixth cavity (126) is formed between the peripheral side wall of the second plunger (5) and the second plunger cavity (12) and can rise and fall synchronously with the second plunger; The main body (1) is provided with: An oil inlet (21) communicating with the second chamber (112); An oil return port (22) communicating with the first chamber (111); An oil outlet (23) communicated with one end of the fifth oil passage (65); A first oil passage (61), one end of which is in communication with the first chamber (111), and the other end of which is in communication with the fifth chamber (125); A second oil passage (62), one end of which is in communication with the first chamber (111); the other end of the second oil passage (62) is in communication with the sixth chamber (126); A third oil passage (63), one end of which is interconnected with the second oil passage (62), and the other end of which is interconnected with one end of an adjustable connecting hole (635), and the other end of which is interconnected with the fifth oil passage (65), and the flow rate of the adjustable connecting hole (635) is limited and adjusted by a needle valve (7) installed on the body; A fourth oil passage (64), one end of which is open and communicates with the third chamber (113) when the first plunger is in a low position; when the first plunger is raised to a high position, the end of the opening is disconnected from the third chamber and communicates with the second chamber (112); the other end of the fourth oil passage remains in communication with the seventh chamber (127); a fifth oil passage (65), one end opening of which is blocked by the second plunger when the second plunger is in a high position, and when the second plunger is lowered to a low position, the end opening can be connected to the sixth chamber (126); a sixth oil passage (66), one end of which is interconnected with the second oil passage (62) and the other end of which is connected to the P port of the solenoid valve (8); An end cover oil passage (921), one end of which is connected to port A of the solenoid valve (8), and the other end of which is connected to the eighth chamber (128); The T port of the solenoid valve (8) is connected to the fourth chamber (114) via a pipeline (81).

2. The hydraulic coupling fan speed regulating control device for a diesel engine as claimed in claim 1, characterized in that: An annular first sealing shoulder (401), a first annular groove (42), a second sealing shoulder (402), a second annular groove (43) and a third sealing shoulder (403) are sequentially formed on the peripheral side wall of the first plunger (4) from bottom to top. The first, second and third sealing shoulders are slidably sealed in cooperation with the side wall of the first plunger cavity, so that the first annular groove and the second annular groove between the first plunger and the first plunger cavity respectively constitute a second chamber and a third chamber which are annular and sealed and can move synchronously with the first plunger in the axial direction.

3. The hydraulic coupling fan speed regulating control device for a diesel engine as claimed in claim 1, characterized in that: A communication port (431) is also provided at the top end of the peripheral side wall of the first plunger, and the third chamber (113) and the fourth chamber (114) are connected via the communication port.

4. The hydraulic coupling fan speed regulating control device for a diesel engine as claimed in claim 1, characterized in that: A fourth annular sealing shoulder (501), a third annular groove (52) and a fifth sealing shoulder (502) are formed on the peripheral side wall of the second plunger (5) from bottom to top in sequence. The fourth sealing shoulder and the fifth sealing shoulder are respectively slidably sealed with the side wall of the second plunger cavity, so that the third annular groove between the second plunger and the second plunger cavity forms a sixth chamber (126) which is annular and sealed and can move synchronously with the second plunger in the axial direction.

5. The hydraulic coupling fan speed regulating control device for a diesel engine as claimed in claim 1, characterized in that: The axial center lines of the first plunger cavity (11) and the second plunger cavity (12) are parallel to each other.

6. The hydraulic coupling fan speed regulating control device for a diesel engine as claimed in claim 1, characterized in that: The axis lines of the control plunger and the second plunger are collinear.

7. The hydraulic coupling fan speed regulating control device for a diesel engine as claimed in claim 1, characterized in that: The second threaded pin is screwed into the pin hole of the second plunger disk and is locked in position by a tightening nut.

8. The hydraulic coupling fan speed regulating control device for a diesel engine as claimed in claim 1, characterized in that: The self-operated temperature control valve core is coaxial with the first plunger; the lifting part (32) of the self-operated temperature control valve core extends into the first plunger cavity and the top end abuts against the bottom end of the first threaded pin (45); the first threaded pin is screwed onto the plug disc of the first plunger and locked in position by a tightening nut.

9. A diesel engine, characterized in that: It comprises the hydraulically coupled fan speed regulating control device for a diesel engine as claimed in claim 1.

10. A vehicle, characterized in that: Comprising the diesel engine as claimed in claim 9.

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