Variable plunger motor with zero position feedback

Abstract

The utility model discloses a variable plunger motor with zero position feedback. The problem that an existing variable displacement motor has no position feedback when the oil distribution disc is in the zero position is solved. The oil cylinder comprises a shell, a rear cover, a containing cavity and an oil inlet and outlet, and further comprises a cylinder body arranged in the containing cavity; a working plunger is arranged on the cylinder body; the oil distribution disc is arranged in the accommodating cavity; pressure oil of the oil inlet and outlet is communicated with the working plunger through the oil distribution disc and drives the cylinder body to rotate; the rotor assembly is arranged in the accommodating cavity; the output shaft is arranged on the rotor assembly; the working plunger is connected with the output shaft through the rotor assembly and drives the output shaft to rotate. The variable piston is used for driving the oil distribution disc to swing; the feedback switch assembly is arranged on the shell and inserted into the shell; the variable piston is connected with the oil distribution disc and switches the feedback switch assembly when the oil distribution disc swings to the zero position. The utility model also has the advantages of simple structure, convenience in assembly, reliable action, long service life and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to a power element, concretely relates to a variable plunger motor with zero feedback. BACKGROUND

[0002] The hydraulic motor is usually the energy conversion device that the output rotation motion is provided with the hydraulic energy of the hydraulic pump and is changed into the mechanical energy, and the plunger motor is a type of the hydraulic motor, and the working medium (hydraulic oil etc.) acts on the piston or plunger. Its working principle is: the working medium (hydraulic oil etc.) acts on the end face of the piston or plunger, makes the piston or plunger do linear reciprocating motion, and then through the motion conversion mechanism (swash plate, cam, crank etc.), the reciprocating motion of the piston or plunger is converted into the circular motion of the output shaft. The existing motor usually works at zero displacement and maximum displacement. In actual application scene, when the vehicle needs to shift, since the motor and the gear of the gearbox are engaged, the motor needs to be at zero displacement to realize the shift, so as to avoid the impact on the gear of the motor and the gear of the gearbox during the shift. The variable motor usually controls the motor displacement to zero through the control valve part in use, but in actual work, due to the sticking of the control valve part or other reasons, the motor that should be at zero displacement still has output after the input control current of the electric proportional control valve, so as to cause the system impact and affect the service life of the product. SUMMARY

[0003] In order to solve the problem that the existing variable motor has no position feedback at zero position in the background art, the utility model provides a variable plunger motor with zero feedback.

[0004] The technical scheme of the utility model is: a variable plunger motor with zero feedback, comprising a shell and a rear cover, the rear cover and the shell are matched to form a containing cavity, the rear cover is provided with an oil inlet and outlet, and further comprising:

[0005] A cylinder body is arranged in the containing cavity, and a working plunger is arranged on the cylinder body.

[0006] An oil distribution disc is arranged in the containing cavity, and the pressure oil of the oil inlet and outlet passes through the oil distribution disc and communicates with the working plunger to drive the cylinder body to rotate.

[0007] A rotor assembly is arranged in the containing cavity.

[0008] An output shaft is arranged on the rotor assembly, and the working plunger is connected with the output shaft through the rotor assembly and drives the output shaft to rotate.

[0009] A variable piston is arranged to drive the oil distribution disc to swing.

[0010] The feedback switch assembly is arranged on the shell and inserted into the shell; the variable piston is connected with the oil distribution disc and switches the feedback switch assembly when the oil distribution disc swings to zero position.

[0011] As a further improvement of the utility model, the feedback switch assembly comprises a switch part, a mounting sleeve and a pushing part, the pushing part is inserted into the shell and pushes the switch part when the oil distribution disc is at zero position, so that the switch part switches.

[0012] As a further improvement of the utility model, the mounting sleeve is arranged on the shell, the pushing part is arranged in the mounting sleeve and is in sliding cooperation with the mounting sleeve, and a sealing ring is arranged in the mounting sleeve.

[0013] As a further improvement of the utility model, a reset part is further arranged, one end of the reset part abuts against the pushing part, and the other end abuts against the mounting sleeve, and the reset part has a movement trend of driving the pushing part to move away from the shell.

[0014] As a further improvement of the utility model, a limiting gasket is further arranged, a pressure receiving head and a pushing head for pushing the switch part are arranged on the pushing part, the area of the pressure receiving head is larger than that of the pushing head, and the limiting gasket is arranged at one end of the pushing head and cooperates with the pressure receiving head to limit the movement of the pushing part.

[0015] As a further improvement of the utility model, the mounting sleeve is threadedly connected with the shell and is locked by a first locking nut, the switch part is inserted into the mounting sleeve and is threadedly connected with the mounting sleeve and is locked by a second locking nut, and a sealing pad is arranged between the second locking nut and the mounting sleeve.

[0016] As a further improvement of the utility model, a limiting screw is further arranged on the shell and is used for limiting the oil distribution disc when the oil distribution disc swings to the maximum displacement, and the oil distribution disc cooperates with the spherical surface of the cylinder body.

[0017] As a further improvement of the utility model, a variable rod is further arranged on the variable piston and is driven to move by the variable piston, and the variable rod is inserted into the oil distribution disc and is used for driving the oil distribution disc to swing.

[0018] As a further improvement of the utility model, an electric proportional valve, an adjusting assembly, a valve seat, a top block, a first elastic part, a second elastic part and a third elastic part are further arranged, the electric proportional valve abuts against the top block and is used for driving the top block to act, and the adjusting assembly abuts against the valve seat; one end of the second elastic part abuts against the variable piston, and the other end abuts against the top block, the electric proportional valve abuts against the top block through a top rod, the third elastic part is sleeved outside the top rod, one end of the third elastic part abuts against the valve seat, and the other end abuts against the top rod.

[0019] As a further improvement of the utility model, the adjusting assembly comprises an adjusting screw rod and a push rod, the adjusting screw rod is in abutment with the push rod and is used for driving the push rod to move, and the push rod is in abutment with the valve seat.

[0020] The utility model discloses the beneficial effect is, be provided with feedback switch subassembly, can switch feedback switch subassembly at zero time through feedback switch subassembly, with system can reliable cooperation thereby, avoid motor malfunction damage spare part. The utility model still has simple structure, convenient assembly, action reliable, long service life and so on advantage. BRIEF DESCRIPTION OF DRAWINGS

[0021] BRIEF DESCRIPTION OF DRAWINGS Figure 1 It is structural schematic diagram of the utility model embodiment.

[0022] BRIEF DESCRIPTION OF DRAWINGS Figure 2 It is structural schematic diagram of the utility model embodiment oil distribution disc at zero position.

[0023] BRIEF DESCRIPTION OF DRAWINGS Figure 3 It is structural schematic diagram of the utility model embodiment feedback switch subassembly.

[0024] BRIEF DESCRIPTION OF DRAWINGS Figure 4 It is structural schematic diagram of the utility model embodiment variable piston place.

[0025] In the drawing, 1, shell;11, accommodating cavity;2, cylinder body;21, working plunger;3, oil distribution disc;4, rotor assembly;5, output shaft;6, variable piston;61, variable rod;7, feedback switch subassembly;71, switch piece;72, mounting sleeve;73, push piece;731, pressure head;732, push head;74, reset piece;75, limit gasket;76, first locking nut;77, second locking nut;78, sealing pad block;79, sealing ring;8, limit screw;91, electric proportional valve;92, adjusting assembly;921, adjusting screw rod;922, push rod;93, valve seat;94, top block;95, first elastic piece;96, second elastic piece;97, third elastic piece;98, top rod. DETAILED DESCRIPTION

[0026] The utility model embodiment is further explained in connection with the drawings:

[0027] By Figure 1 Combined Figures 2-4 As shown in a kind of variable plunger motor with zero feedback, including shell 1 and back cover, the back cover and shell 1 are mutually matched to form accommodating cavity 11;The back cover is equipped with inlet and outlet oil port, and further include:

[0028] Cylinder body 2, is located in accommodating cavity 11;The cylinder body 2 is equipped with working plunger 21;

[0029] The oil distribution disc 3 is arranged in the accommodating cavity 11; the pressure oil of the inlet and outlet oil port is communicated with the working plunger 21 through the oil distribution disc 3 and drives the cylinder body 2 to rotate;

[0030] The rotor assembly 4 is arranged in the accommodating cavity 11;

[0031] The output shaft 5 is arranged on the rotor assembly 4; the working plunger 21 is connected with the output shaft 5 through the rotor assembly 4 and drives the output shaft 5 to rotate;

[0032] The variable piston 6 is arranged on the cylinder body 2 and drives the oil distribution disc 3 to swing;

[0033] The feedback switch assembly 7 is arranged on the shell 1 and is inserted into the shell 1; the variable piston 6 is connected with the oil distribution disc 3 and switches the feedback switch assembly 7 when the oil distribution disc 3 swings to zero position. The feedback switch assembly is arranged, the feedback switch assembly can be switched at zero position, so that the system can be reliably matched, and damage of parts caused by misoperation of the motor is avoided. The feedback switch assembly can be connected with the control module of the system, and the feedback switch assembly can be switched only when the oil distribution disc is at zero position (at the lowest speed or zero speed), the feedback switch assembly can be unlocked for gear shifting, and impact of the motor gear on the gearbox gear during gear shifting is avoided. That is, when the electric proportional valve controls zero displacement (current required for output zero displacement), even if the variable piston is faulty or stuck, the system receives the electric proportional valve control signal, but the feedback switch assembly cannot be switched and gear shifting is not performed.

[0034] The feedback switch assembly 7 comprises a switch piece 71, a mounting sleeve 72 and a pushing piece 73; the pushing piece 73 is inserted into the shell 1 and pushes the switch piece 71 when the oil distribution disc 3 is at zero position, so that the switch piece 71 is switched. Such structure makes the pushing piece simple in action and convenient in operation.

[0035] The mounting sleeve 72 is arranged on the shell 1, the pushing piece 73 is arranged in the mounting sleeve 72 and is in sliding cooperation with the mounting sleeve 72, and the mounting sleeve 72 is internally provided with a sealing ring 79. Specifically, the reset piece 74 is arranged, one end of the reset piece 74 is in abutment with the pushing piece 73, the other end of the reset piece 74 is in abutment with the mounting sleeve 72, and the reset piece 74 has a movement tendency of driving the pushing piece 73 to move away from the shell 1. More specifically, the limiting gasket 75 is arranged, the pushing piece 73 is internally provided with a pressure receiving head 731 and a pushing head 732 for pushing the switch piece 71, the area of the pressure receiving head 731 is greater than the area of the pushing head 732, and the limiting gasket 75 is arranged at one end of the pushing head 732 and is in cooperation with the pressure receiving head 731 to limit the movement of the pushing piece 73. The limiting gasket and the pressure receiving head are cooperated to avoid over-movement of the pushing piece. The product has simple structure and reliable action. The pushing piece can replace the limiting screw of the zero position of the oil distribution disc, thereby reducing the cost. The sealing ring can isolate the influence of the oil pressure of the shell cavity (accommodation cavity) on the switch piece

[0036] The mounting sleeve 72 is in threaded connection with the shell 1 and is locked through the first locking nut 76, the switch piece 71 is inserted into the mounting sleeve 72 and is in threaded connection with the mounting sleeve 72 and is locked through the second locking nut 77, and the second locking nut 77 is provided with the sealing gasket 78 between the mounting sleeve 72. Such a structure facilitates product installation, is simple in structure and convenient and reliable in assembly. The sealing gasket reduces impact and avoids wear of the switch piece.

[0037] The utility model further includes the limiting screw 8, is arranged on the shell 1, is used for limiting the oil distribution disc 3 when the oil distribution disc 3 swings to the maximum displacement, the oil distribution disc 3 is cooperated with the spherical surface of cylinder body 2. The limiting screw makes the product action more stable, can adjust the maximum displacement of the product, thereby adjusts the output shaft speed.

[0038] The utility model further includes the variable lever 61, is arranged on the variable piston 6 and is driven to move by the variable piston 6, the variable lever 61 is inserted on the oil distribution disc 3 and is used for driving the oil distribution disc 3 to swing. Such a structure can reliably drive the oil distribution disc to act through the variable lever

[0039] The utility model also includes electric proportional valve 91, adjusting assembly 92, valve seat 93, top block 94, first elastic part 95, second elastic part 96 and third elastic part 97, electric proportional valve 91 with top block 94 and be used for driving top block 94 action, adjusting assembly 92 with valve seat 93 and be opposite, second elastic part 96 one end with variable piston 6 and be opposite, the other end with top block 94 and be opposite, electric proportional valve 91 pass through top rod 98 with top block 94 and be opposite, third elastic part 97 is set up in top rod 98 outside, third elastic part 97 one end with valve seat 93 and be opposite, the other end with top rod 98 and be opposite, specifically, adjusting assembly 92 includes adjusting screw rod 921 and push rod 922, adjusting screw rod 921 with push rod 922 and be used for driving push rod 922 movement, push rod 922 with valve seat 93 and be opposite, the setting of adjusting assembly can adjust the starting current size, host control is not easy to fluctuate, adapts market demand, makes product adaptation range be wider. Such structure pushes valve seat through push rod, makes first elastic part, second elastic part and third elastic part elasticity force change, thereby make the starting current of adjusting electric proportional valve, make host control not easy to fluctuate, can adjust according to host and market demand, make product adaptation range be wider.

[0040] In the description of the utility model, it is to explain that, the orientation or position relation that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" indicate is based on the orientation or position relation shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and it is not indicated or implied that the indicated device or element must have a particular orientation, a particular orientation and operation, therefore it can not be understood as the limitation of the utility model. In addition, the terms "first", "second" are only for the purpose of description, and can not be understood as indicating or implying relative importance.

[0041] In the description of the utility model, it is to explain that, unless otherwise specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, can be detachable connection, or integrally connected, can be mechanical connection, can be electrical connection, can be directly connected, or indirectly connected through intermediate medium, can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances. In addition, in the description of the utility model, unless otherwise stated, the meaning of "multiple" is two or more.

[0042] Skilled persons should know: although the utility model has been described according to the above specific embodiment, the utility model idea of the utility model is not limited to this utility model, and any modification using the utility model idea will be included in the utility model patent protection range.

Claims

1. A variable displacement piston motor with zero-position feedback, comprising a housing (1) and a rear cover, wherein the rear cover and the housing (1) cooperate to form a receiving cavity (11); the rear cover is provided with an oil inlet and outlet port, characterized in that: Also includes: A cylinder body (2) is located inside a receiving cavity (11); a working plunger (21) is provided on the cylinder body (2); The oil distribution plate (3) is located in the accommodating cavity (11); the pressure oil in the inlet and outlet ports is connected to the working plunger (21) through the oil distribution plate (3) and drives the cylinder (2) to rotate; The rotor assembly (4) is located within the accommodating cavity (11); The output shaft (5) is mounted on the rotor assembly (4); the working plunger (21) is connected to the output shaft (5) through the rotor assembly (4) and drives the output shaft (5) to rotate; The variable piston (6) is used to drive the oil distribution plate (3) to swing. Feedback switch assembly (7) is located on housing (1) and inserted into housing (1); the variable piston (6) is connected to oil distribution plate (3) and switches the feedback switch assembly (7) when oil distribution plate (3) swings to zero position.

2. A variable displacement piston motor with zero-position feedback according to claim 1, characterized in that... The feedback switch assembly (7) includes a switch (71), a mounting sleeve (72) and a pusher (73). The pusher (73) is inserted into the housing (1) and pushes the switch (71) to switch when the oil distribution plate (3) is in the zero position.

3. A variable displacement piston motor with zero-position feedback according to claim 2, characterized in that... The mounting sleeve (72) is provided on the housing (1), and the pusher (73) is provided inside the mounting sleeve (72) and slides in cooperation with the mounting sleeve (72); a sealing ring (79) is provided inside the mounting sleeve (72).

4. A variable displacement piston motor with zero-position feedback according to claim 3, characterized in that... It also includes a reset member (74), one end of which abuts against the push member (73) and the other end against the mounting sleeve (72). The reset member (74) has a tendency to drive the push member (73) away from the housing (1).

5. A variable displacement piston motor with zero-position feedback according to claim 4, characterized in that... It also includes a limiting pad (75). The pusher (73) is provided with a pressure head (731) and a pusher head (732) for pushing the switch (71). The area of ​​the pressure head (731) is larger than the area of ​​the pusher head (732). The limiting pad (75) is located at one end of the pusher head (732) and cooperates with the pressure head (731) to limit the movement of the pusher (73).

6. A variable displacement piston motor with zero-position feedback according to claim 2, characterized in that... The mounting sleeve (72) is threaded to the housing (1) and locked by the first locking nut (76). The switch (71) is inserted into the mounting sleeve (72) and threaded to the mounting sleeve (72) and locked by the second locking nut (77). A sealing gasket (78) is provided between the second locking nut (77) and the mounting sleeve (72).

7. A variable displacement piston motor with zero-position feedback according to claim 1, characterized in that... It also includes a limiting screw (8), which is located on the housing (1) and is used to limit the oil distribution plate (3) when the oil distribution plate (3) swings to the maximum displacement. The oil distribution plate (3) is spherically engaged with the cylinder body (2).

8. A variable displacement piston motor with zero-position feedback according to claim 1, characterized in that... It also includes a variable rod (61), which is mounted on the variable piston (6) and driven by the variable piston (6). The variable rod (61) is inserted into the oil distribution plate (3) to drive the oil distribution plate (3) to swing.

9. A variable displacement piston motor with zero-position feedback according to claim 1, characterized in that... It also includes an electro-proportional valve (91), an adjusting assembly (92), a valve seat (93), a top block (94), a first elastic element (95), a second elastic element (96), and a third elastic element (97). The electro-proportional valve (91) abuts against the top block (94) and is used to drive the top block (94) to move. The adjusting assembly (92) abuts against the valve seat (93). One end of the second elastic element (96) abuts against the variable piston (6), and the other end abuts against the top block (94). The electro-proportional valve (91) abuts against the top block (94) through a top rod (98). The third elastic element (97) is sleeved outside the top rod (98). One end of the third elastic element (97) abuts against the valve seat (93), and the other end abuts against the top rod (98).

10. A variable displacement piston motor with zero-position feedback according to claim 9, characterized in that... The adjustment assembly (92) includes an adjustment screw (921) and a push rod (922). The adjustment screw (921) abuts against the push rod (922) and is used to drive the push rod (922) to move. The push rod (922) abuts against the valve seat (93).

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