Hydraulic pump motor sealed lead-out device

Abstract

The present invention belongs to the technical field of motors, and specifically relates to a sealed lead-out device for a hydraulic pump motor. The sealed lead-out device is installed at the mounting hole of the rear end cover of the hydraulic pump motor, and includes: a terminal post, which is sequentially divided into a winding connection section for connecting to the winding, a support connection section, and a threaded connection section for threaded connection to the controller drive board of the hydraulic pump motor, and the support connection section of the terminal post is inserted and installed at the mounting hole of the rear end cover; an insulating sleeve, the insulating sleeve is arranged between the terminal post and the mounting hole of the rear end cover; a locking piece, the locking piece is installed in the threaded connection section of the terminal post, and the outer end surface of the locking piece stops against the inner wall surface of the controller drive board to lock and fix the terminal post. Compared with the prior art, the sealed lead-out device has a simple structure, reduces material cost and procurement cost, and reduces the risk of sealing failure due to complex structure; at the same time, it improves the stability and durability of the sealing structure.

Description

Technical Field

[0001] The invention belongs to the technical field of motors, and in particular relates to a sealed lead-out wire device for a hydraulic pump motor. Background Art

[0002] The hydraulic pump motor drives the reciprocating motion of the plunger inside the hydraulic piston pump through its rotation, thereby realizing the hydraulic pump to suck and pressurize oil. The reversing part of the motor is composed of a controller and a sensor, and the controller and the sensor are composed of various precise, sensitive components and integrated circuits. Once they are contaminated by hydraulic oil, they will malfunction or fail.

[0003] The prior art is that when the motor phase line passes through the terminal and is connected to the controller circuit board, a multi-layer sealing structure is set on the outside of the motor terminal to ensure that the hydraulic oil in the motor cavity is isolated from the controller cavity. However, during the use of the motor, the internal vibration is often large, and a gap is easily generated between the motor phase line and the terminal. There is no anti-loosening measure designed between them, which easily leads to relative rotation, hydraulic oil leakage into the controller cavity, causing the controller to malfunction or fail. The prior art also uses glass sintered terminals, but the manufacturing difficulty is large and the production cost is high.

[0004] Based on this, the present invention provides a hydraulic pump motor sealed lead-out device to overcome the above-mentioned defects. Summary of the invention

[0005] The first object of the present invention is to provide a hydraulic pump motor sealed lead-out wire device, which has a simple structure, reduces material cost and procurement cost, reduces assembly difficulty, reduces the probability of errors during assembly, improves production efficiency and reduces the risk of sealing failure due to complex structure; at the same time, reduces looseness caused by factors such as vibration, thereby reducing the risk of hydraulic oil leakage and improving the stability and durability of the sealing structure.

[0006] The present invention adopts the following technical solution: a hydraulic pump motor sealed lead-out device, which is installed at the mounting hole of the rear end cover of the hydraulic pump motor, and comprises:

[0007] A terminal post, the terminal post is sequentially divided into a winding connection section for connecting with the winding, a support connection section, and a threaded connection section for threaded connection with a controller drive plate of a hydraulic pump motor, the support connection section of the terminal post being inserted and installed at the installation hole of the rear end cover;

[0008] An insulating sleeve, the insulating sleeve being arranged between the terminal and the mounting hole of the rear end cover;

[0009] A locking piece is installed on the threaded connection section of the terminal, and the outer end surface of the locking piece abuts against the inner wall surface of the controller drive board to lock and fix the terminal.

[0010] Furthermore, the sealed lead-out device further comprises:

[0011] An insulating gasket, the insulating gasket comprises an annular connecting portion and a first polygonal connecting portion, the annular connecting portion is sleeved and installed on one end of the insulating sleeve close to the locking piece, and the first polygonal connecting portion is sleeved and installed on the locking piece.

[0012] Furthermore, the locking member is a special-shaped nut member having a second polygonal connecting portion;

[0013] The sealed lead-out device also includes:

[0014] A stop gasket, the stop gasket includes an axial limiting portion, an insulating gasket abutting portion and a locking member abutting portion, the axial limiting portion is installed between the locking member and the insulating gasket, the insulating gasket abutting portion abuts against the A surface of the first polygonal connecting portion, the locking member abutting portion abuts against the B surface of the second polygonal connecting portion, and there is an angle between the A surface and the B surface.

[0015] Furthermore, the axial limiting portion, the insulating gasket abutting portion and the locking member abutting portion are integrally formed to form the stop gasket.

[0016] Furthermore, a first limiting portion is formed at one end of the supporting connection section of the terminal near the locking member, the first limiting portion is a planar structure, and a first protrusion matching with the first limiting portion is formed at a corresponding position of the insulating sleeve;

[0017] And / or, a second limiting portion is formed on the outer wall surface of the insulating sleeve near one end of the locking piece, and the second limiting portion is a planar structure, and a second protrusion that cooperates with the second limiting portion is formed at the connection between the insulating gasket and the rear end cover and the insulating sleeve.

[0018] Furthermore, at least one first sealing ring notch is provided on the outer wall surface of the insulating sleeve, and a first sealing ring is placed in the first sealing ring notch, so that the rear end cover is sealed and connected with the insulating sleeve;

[0019] And / or, at least one second sealing ring notch is provided on the outer wall surface of the terminal, and a second sealing ring is placed in the second sealing ring notch, so that the terminal is sealed and connected to the insulating sleeve;

[0020] Furthermore, the outer wall surface of the supporting connection section of the terminal is a first stepped structure, and the shape of the inner wall surface of the insulating sleeve matches the first stepped structure;

[0021] The outer wall surface of the insulating sleeve is a second step structure, and the shape of the inner wall surface at the mounting hole of the rear end cover matches the second step structure;

[0022] The first step structure and the second step structure both include a first step, a second step ... an Nth step, N≥2; the first step, the second step ... the Nth step each have at least one first sealing ring notch or a second sealing ring notch.

[0023] Furthermore, a boss is formed on one end of the terminal winding connection section away from the insulating sleeve.

[0024] Furthermore, the terminal post is a copper terminal post.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1) The hydraulic pump motor sealed lead-out device in the present invention is mainly composed of a terminal, an insulating sleeve and a locking piece, and has a simple structure, which not only reduces the number of parts, reduces material costs and procurement costs, but also reduces the difficulty of assembly, reduces the probability of errors in the assembly process, improves production efficiency and reduces the risk of sealing failure due to complex structure.

[0027] At the same time, on the one hand, the terminal adopts a segmented design, which makes the connection with the winding, rear end cover and controller driver board clearer and more stable, improving the reliability and safety of the connection. On the other hand, the setting of the insulating sleeve effectively ensures the electrical insulation performance and prevents safety hazards such as leakage.

[0028] In addition, the locking piece can ensure the firm fixation of the terminal and reduce loosening caused by factors such as vibration, thereby reducing the risk of hydraulic oil leakage and improving the stability and durability of the sealing structure.

[0029] 2) Add the design of insulating gasket: The two ends of the insulating gasket are connected to the insulating sleeve and the locking piece, forming a complete insulating path, which prevents the current from being conducted from the locking piece to the rear cover through other paths, ensuring the tightness of electrical insulation. At the same time, the connecting function of the insulating gasket can make the combination between the locking piece, the insulating sleeve and other related parts tighter and more stable, reducing looseness and displacement during the operation of the motor.

[0030] 3) Add a stop gasket design: The stop gasket abuts the polygonal connection between the insulating gasket and the locking piece, increasing the rotation resistance and limiting the relative rotation between the two. In a vibration and impact environment, this limiting effect can prevent loosening and rotation caused by slight displacement between components. This ensures the stability of the fixing of the insulating gasket and the locking piece, limits the relative rotation of the insulating gasket and the locking piece, and effectively prevents loosening in mechanical environments such as vibration and impact.

[0031] 4) Add the design of the limiter and the protrusion: Through the cooperation of the limiter and the protrusion, the relative rotation between the components is effectively limited, so that the entire sealing structure can maintain the relative position of the components when facing mechanical effects such as vibration and impact, reduce the possibility of loosening and displacement, and thus improve the overall stability of the structure. At the same time, it avoids the wear or dislocation of the sealing surface caused by relative rotation, ensures the sealing of the sealing structure, effectively prevents the leakage of liquids such as hydraulic oil, and ensures the normal operation of the motor. In addition, it reduces the risk of failure caused by the relative rotation of components, extends the service life of the sealing structure, and improves the reliability of the motor in complex working environments.

[0032] The second object of the present invention is to provide a hydraulic pump motor, which includes a motor body and a sealed lead-out wire structure installed in the motor body, wherein the sealed lead-out wire structure is the above-mentioned hydraulic pump motor sealed lead-out wire device. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] 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, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 The explosion of the sealed lead-out device of the hydraulic pump motor in one embodiment of the present invention Figure 1 ;

[0035] Figure 2 The explosion of the sealed lead-out device of the hydraulic pump motor in one embodiment of the present invention Figure 2 ;

[0036] Figure 3 It is a schematic diagram of the structure of the assembled hydraulic pump motor sealed lead-out device in one embodiment of the present invention;

[0037] Figure 4 for Figure 3 The main view;

[0038] Figure 5 for Figure 4 Sectional view at AA;

[0039] Figure 6 This is an application view of a sealed lead-out wire device for a hydraulic pump motor in one embodiment of the present invention;

[0040] Figure 7 for Figure 6 Schematic diagram of the structure of the middle and rear end covers;

[0041] Among them: rear end cover 1, mounting hole 10; terminal 2, winding connection section 20, support connection section 21, threaded connection section 22, first limiting portion 23, second sealing ring notch 24, first step structure 25, boss 26; controller drive board 3; insulating sleeve 4, first protruding portion 40, second limiting portion 41, first sealing ring notch 42, second step structure 43; locking piece 5, second polygonal connection portion 50; insulating gasket 6, annular connection portion 60, first polygonal connection portion 61, second protruding portion 62; stop gasket 7, axial limiting portion 70, insulating gasket abutment portion 71, locking piece abutment portion 72. DETAILED DESCRIPTION

[0042] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention.

[0043] The following is combined with Figure 1 To Attachment Figure 7 And specific embodiments, the present invention is described in detail:

[0044] The hydraulic pump motor includes a motor body and a controller body. The motor body has a built-in motor cavity, in which the stator assembly and the rotor assembly are both arranged; the controller body has a controller cavity, in which the controller and the sensor are arranged. The controller is used to energize the winding of the stator assembly, and at the same time, it cooperates with the sensor to realize closed-loop control of the rotor rotation angle.

[0045] The motor cavity of the hydraulic pump motor is filled with hydraulic oil, and the controller cavity needs to be kept sealed to prevent the hydraulic oil in the motor cavity from entering the controller cavity. Based on the above existing design, the present invention designs a sealed lead-out device for the hydraulic pump motor, through which the controller and the winding are connected. The controller energizes the winding through the sealed lead-out device, achieving power supply from the controller to the winding in a closed space, thereby driving the hydraulic pump motor to operate.

[0046] like Figures 1 to 7 As shown, the present invention provides a hydraulic pump motor sealed lead-out device, which is installed at the mounting hole 10 of the rear end cover 1 of the hydraulic pump motor, as shown in FIG. Figure 6 As shown, including:

[0047] The terminal 2 is sequentially divided into a winding connection section 20 for connecting with the winding, a support connection section 21, and a threaded connection section 22 for threaded connection with the controller drive board 3 of the hydraulic pump motor. The support connection section 21 of the terminal 2 is inserted and installed at the installation hole 10 of the rear end cover 1. In this embodiment, the terminal 2 is a copper column with good electrical conductivity and corrosion resistance.

[0048] The insulating sleeve 4 is tightly sleeved between the terminal 2 and the mounting hole 10 of the rear end cover 1 to prevent the electricity from the terminal 2 from being transmitted to the rear end cover 1, thereby preventing the motor from leaking electricity and ensuring electrical insulation. The insulating sleeve 4 can be made of a material that is resistant to high temperature, oil, and wear and has good insulation properties, such as polyimide, polytetrafluoroethylene, etc.

[0049] The locking member 5 is installed on the threaded connection section 22 of the terminal 2, and the outer end surface of the locking member 5 abuts against the inner wall surface of the controller driving board 3, so as to achieve the locking and fixing of the terminal 2.

[0050] When in use, the sealed lead-out device connects the controller and the winding with the help of the terminal 2. The controller energizes the terminal 2, thereby energizing the winding, so that the controller supplies power to the winding in a closed space, thereby driving the hydraulic pump motor to operate.

[0051] The hydraulic pump motor sealed lead-out device in the present invention is mainly composed of a terminal 2, an insulating sleeve 4 and a locking piece 5, and has a simple structure. It not only reduces the number of parts, reduces material costs and procurement costs, but also reduces the difficulty of assembly, reduces the probability of errors in the assembly process, improves production efficiency and reduces the risk of sealing failure due to complex structure.

[0052] At the same time, on the one hand, the terminal 2 adopts a segmented design, which makes the connection between it and the winding, the rear end cover 1 and the controller drive board 3 clearer and more stable, improving the reliability and safety of the connection. On the other hand, the setting of the insulating sleeve 4 effectively ensures the electrical insulation performance and prevents safety hazards such as leakage.

[0053] In addition, the locking member 5 can ensure the firm fixation of the terminal 2 and reduce looseness caused by factors such as vibration, thereby reducing the risk of hydraulic oil leakage and improving the stability and durability of the sealing structure.

[0054] Furthermore, in order to prevent the electrical conduction of the terminal to the rear end cover, causing the motor to leak, the design of an insulating gasket 6 is added to the sealed lead-out device. The specific design scheme is as follows:

[0055] The sealed lead-out device may further include:

[0056] The insulating gasket 6 includes an annular connecting portion 60 and a first polygonal connecting portion 61. The annular connecting portion 60 is sleeved on the end of the insulating sleeve 4 close to the locking member 5, and the first polygonal connecting portion 61 is sleeved on the locking member 5. In this embodiment, the insulating gasket 6 can be made of a material that is resistant to high temperature, oil, has good insulation performance, and has certain elasticity and mechanical strength. In this embodiment, the first polygonal connecting portion 61 is a hexagonal connecting portion.

[0057] The two ends of the insulating gasket 6 are respectively connected to the insulating sleeve 4 and the locking member 5, forming a complete insulating path, which prevents the current from being conducted from the locking member 5 to the rear end cover through other paths, and ensures the tightness of electrical insulation. At the same time, the connecting function of the insulating gasket 6 can make the combination between the locking member 5, the insulating sleeve 4 and other related parts more compact and stable, reducing looseness and displacement during the operation of the motor.

[0058] Furthermore, in order to enhance the stability of the sealed lead-out device and effectively solve the possible relative rotation loosening problem, a stop gasket 7 is added between the insulating gasket 6 and the locking member 5. The specific technical solution is as follows:

[0059] The locking member 5 is a special-shaped nut member having a second polygonal connecting portion 50 . In this embodiment, the second polygonal connecting portion 50 is a hexagonal connecting portion, so the special-shaped nut member is a hexagonal special-shaped nut.

[0060] The sealed lead-out device also includes:

[0061] The stop gasket 7 includes an axial limiting portion 70, an insulating gasket abutting portion 71 and a locking member abutting portion 72. The axial limiting portion 70 is installed between the locking member 5 and the insulating gasket 6, and the axial limiting portion 70, the locking member 5 and the insulating gasket 6 are coaxially arranged. The insulating gasket abutting portion 71 abuts against the A surface of the first polygonal connecting portion 61, and the locking member abutting portion 72 abuts against the B surface of the second polygonal connecting portion 50; the stop gasket 7 abuts against the polygonal connecting portions of the insulating gasket 6 and the locking member 5, thereby increasing the rotation resistance and limiting the relative rotation between the two. In a vibration and impact environment, this limiting effect can prevent loosening and rotation caused by slight displacement between components. Thereby ensuring the stability of the fixing of the insulating gasket 6 and the locking member 5, limiting the relative rotation of the insulating gasket 6 and the locking member 5, and effectively preventing loosening in mechanical environments such as vibration and impact.

[0062] It should be noted that surface A of the first polygonal connection part 61 and surface B of the second polygonal connection part 50 are both planes, and surface A and surface B are not arranged in parallel, that is, there is a certain angle between surface A and surface B. The existence of the angle makes it possible for a self-locking tendency to be generated between the components when subjected to external forces such as vibration and impact, which can more effectively prevent relative rotation between the insulating gasket 6 and the locking member 5, enhance the stability of the connection, and reduce the risk of loosening due to vibration.

[0063] More specifically, the connection among the axial limiting portion 70, the insulating gasket abutting portion 71 and the locking member abutting portion 72 in the present invention is not specifically limited, and the stop gasket 7 can be formed by welding a split structure, or can be formed by an integrally formed structure. Preferably, the axial limiting portion 70, the insulating gasket abutting portion 71 and the locking member abutting portion 72 are integrally formed to form the stop gasket 7, which can better withstand axial and radial forces, and is not prone to breakage or deformation in harsh working environments. At the same time, the integrally formed stop gasket 7 can provide more stable performance during operation, ensuring a reliable connection between the insulating gasket 6 and the locking member 5, etc.

[0064] Furthermore, in order to prevent the relative rotation between the insulating sleeve 4 and the terminal 2, the insulating sleeve 4 and the insulating gasket 6 or the rear end cover 1, the design of the limiting part and the protruding part is added, and the specific design scheme is as follows:

[0065] A first limiting portion 23 is formed at one end of the supporting connection section 21 of the terminal 2 near the locking piece 5. The first limiting portion 23 is a planar structure. A first protrusion 40 that cooperates with the first limiting portion 23 is formed at a corresponding position of the insulating sleeve 4 to limit the relative rotation between the insulating sleeve 4 and the terminal 2.

[0066] A second limiting portion 41 is formed on the outer wall surface of the insulating sleeve 4 near one end of the locking piece 5. The second limiting portion 41 is a planar structure. The insulating gasket 6 and the connection between the rear end cover 1 and the insulating sleeve 4 are both formed with a second protrusion 62 that cooperates with the second limiting portion 41, which can limit the relative rotation between the insulating gasket 6 or the rear end cover 1 and the insulating sleeve 4.

[0067] The cooperation between the limiting part and the protruding part effectively limits the relative rotation between the components, so that the entire sealing structure can maintain the relative position of the components when facing mechanical effects such as vibration and impact, reduce the possibility of loosening and displacement, and thus improve the overall stability of the structure. At the same time, it avoids the wear or dislocation of the sealing surface caused by relative rotation, ensures the sealing of the sealing structure, effectively prevents the leakage of liquids such as hydraulic oil, and ensures the normal operation of the motor. In addition, it reduces the risk of failure caused by the relative rotation of components, extends the service life of the sealing structure, and improves the reliability of the motor in complex working environments.

[0068] Furthermore, in order to ensure the sealing performance, in the specific embodiment, sealing ring grooves are provided on the insulating sleeve 4 and the terminal 2. The specific design scheme is as follows:

[0069] At least one first sealing ring groove 42 is formed on the outer wall surface of the insulating sleeve 4, and a first sealing ring is placed in the first sealing ring groove 42, so as to realize a sealed connection between the mounting hole 10 of the rear end cover 1 and the insulating sleeve 4, thereby ensuring the sealing between the insulating sleeve 4 and the rear end cover 1.

[0070] At least one second sealing ring notch 24 is provided on the outer wall surface of the terminal 2, and a second sealing ring is placed in the second sealing ring notch 24, so as to realize a sealed connection between the terminal 2 and the insulating sleeve 4, and ensure the sealing between the insulating sleeve 4 and the terminal 2. It should be noted that the present invention does not limit the number of the first sealing ring notches 42 and the first sealing ring notches 42, and preferably there are multiple, such as two in the present embodiment.

[0071] By setting the sealing ring notch at a specific position and placing the sealing ring, the tiny gaps between the components can be effectively filled, forming a good sealing barrier, significantly improving the sealing performance and preventing the leakage of hydraulic oil or other liquids and gases. At the same time, the design of multiple sealing ring notches and sealing rings increases the redundancy of the seal, and even under harsh working conditions, such as high temperature, high pressure, vibration, etc., it can still maintain a reliable sealing effect and adapt to different working conditions.

[0072] More specifically, the outer wall surface of the supporting connection section 21 of the terminal 2 is a first stepped structure 25 , and the shape of the inner wall surface of the insulating sleeve 4 matches the first stepped structure 25 .

[0073] The outer wall surface of the insulating sleeve 4 is a second step structure 43, and the shape of the inner wall surface at the mounting hole 10 of the rear end cover 1 matches the second step structure 43. As in this embodiment, the outer diameters of the first step structure 25 and the second step structure 43 decrease in the direction from the rear end cover 1 to the controller drive board 3, so as to prevent the lead wire sealing structure from moving toward the controller drive board 3.

[0074] The coordination of the stepped structure enables more precise positioning and installation, reduces the shaking between components, and thus improves the stability of the entire structure. At the same time, the tightly matched stepped structure helps to reduce gaps, improve the sealing effect, and protect the working environment inside the motor.

[0075] In addition, the stepped structure increases the support bearing area and can disperse the stress acting on the component more evenly to different step surfaces, thereby reducing local stress concentration and the risk of component damage.

[0076] Meanwhile, the first stepped structure 25 and the second stepped structure 43 both include a first step, a second step, ..., an Nth step, where N is a positive integer ≥2.

[0077] The first step, the second step, ... the Nth step all have at least one first sealing ring notch 42 or second sealing ring notch 24. In this embodiment, N is 2, that is, only the first step and the second step are provided, and only two steps are provided.

[0078] Sealing ring slots are opened on multiple steps, increasing the number and distribution range of sealing rings, providing multiple sealing lines of defense, and greatly improving the reliability and stability of sealing. At the same time, multiple sealing rings can work together to ensure good sealing performance under various working conditions.

[0079] Furthermore, a boss 26 is formed at one end of the winding connection section 20 of the terminal 2 away from the insulating sleeve 4; when in use, the winding is wound and then welded to the winding connection section 20 of the terminal 2, and the boss 26 plays a limiting role to prevent the winding from being wound out of the end of the terminal 2; at the same time, the boss 26 can also play a positioning role to help the winding be accurately placed in a predetermined position, thereby improving production efficiency and product quality.

[0080] Based on the above-mentioned sealed lead-out device for a hydraulic pump motor, the present invention further provides a hydraulic pump motor, which includes a motor body and a sealed lead-out structure installed in the motor body, wherein the sealed lead-out structure is the above-mentioned sealed lead-out device for a hydraulic pump motor. The hydraulic pump motor has at least all the technical solutions of the above-mentioned sealed lead-out device for a hydraulic pump motor and all the advantages of the sealed lead-out device for a hydraulic pump motor, which will not be described in detail here.

[0081] The present invention is further described above with the aid of specific embodiments. However, it should be understood that the specific description here should not be construed as limiting the essence and scope of the present invention. Various modifications made to the above embodiments by ordinary technicians in the field after reading this specification are all within the scope of protection of the present invention.

Claims

1. A sealed lead-out device for a hydraulic pump motor, mounted at the mounting hole of the rear end cover of the hydraulic pump motor, characterized in that: It includes: A terminal post, the terminal post is sequentially divided into a winding connection section for connecting with the winding, a support connection section, and a threaded connection section for threaded connection with a controller drive plate of a hydraulic pump motor, the support connection section of the terminal post being inserted and installed at the installation hole of the rear end cover; An insulating sleeve, the insulating sleeve being arranged between the terminal and the mounting hole of the rear end cover; A locking member, wherein the locking member is mounted on the threaded connection section of the terminal, and the outer end surface of the locking member abuts against the inner wall surface of the controller driving board to lock and fix the terminal; The sealed lead-out device also includes: An insulating gasket, the insulating gasket comprising an annular connecting portion and a first polygonal connecting portion, the annular connecting portion is sleeved and mounted on one end of the insulating sleeve close to the locking member, and the first polygonal connecting portion is sleeved and mounted on the locking member; At least one first sealing ring notch is provided on the outer wall surface of the insulating sleeve, and a first sealing ring is placed in the first sealing ring notch, so that the rear end cover is sealed and connected with the insulating sleeve; And / or, at least one second sealing ring notch is provided on the outer wall surface of the terminal, and a second sealing ring is placed in the second sealing ring notch, so that the terminal is sealed and connected to the insulating sleeve; The outer wall surface of the supporting connection section of the terminal is a first step structure, and the shape of the inner wall surface of the insulating sleeve matches the first step structure; The outer wall surface of the insulating sleeve is a second step structure, and the shape of the inner wall surface at the mounting hole of the rear end cover matches the second step structure; The first step structure and the second step structure both include a first step, a second step ... an Nth step, N≥2; the first step, the second step ... the Nth step each have at least one first sealing ring notch or a second sealing ring notch.

2. The hydraulic pump motor sealed lead-out device according to claim 1, characterized in that: The locking member is a special-shaped nut member having a second polygonal connecting portion; The sealed lead-out device also includes: A stop gasket, the stop gasket includes an axial limiting portion, an insulating gasket abutting portion and a locking member abutting portion, the axial limiting portion is installed between the locking member and the insulating gasket, the insulating gasket abutting portion abuts against the A surface of the first polygonal connecting portion, the locking member abutting portion abuts against the B surface of the second polygonal connecting portion, and there is an angle between the A surface and the B surface.

3. The hydraulic pump motor sealed lead-out device according to claim 2, characterized in that: The axial limiting portion, the insulating gasket abutting portion and the locking member abutting portion are integrally formed to form the stop gasket.

4. The hydraulic pump motor sealed lead-out device according to claim 2, characterized in that: A first limiting portion is formed at one end of the supporting connection section of the terminal near the locking member, the first limiting portion is a planar structure, and a first protrusion matching the first limiting portion is formed at a corresponding position of the insulating sleeve; And / or, a second limiting portion is formed on the outer wall surface of the insulating sleeve near one end of the locking piece, and the second limiting portion is a planar structure, and a second protrusion that cooperates with the second limiting portion is formed at the connection between the insulating gasket and the rear end cover and the insulating sleeve.

5. The hydraulic pump motor sealed lead-out device according to claim 1, characterized in that: A boss is formed at one end of the winding connection section of the terminal away from the insulating sleeve.

6. The hydraulic pump motor sealed lead-out device according to claim 1, characterized in that: The connecting post is a copper post.

7. A hydraulic pump motor, characterized in that: It comprises a motor body and a sealed lead-out wire structure installed in the motor body, wherein the sealed lead-out wire structure is the hydraulic pump motor sealed lead-out wire device according to any one of claims 1 to 6.

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