Reciprocating driving unit

Abstract

The utility model relates to a reciprocating driving unit which comprises a shell, a first motor, a second motor, a first transmission assembly, a second transmission assembly, a planet wheel speed reduction assembly, a first execution assembly and a second execution assembly. The first transmission assembly is in transmission connection between the first motor and a sun gear of the planet gear speed reduction assembly, and the second transmission assembly is in transmission connection between the second motor and an inner gear ring of the planet gear speed reduction assembly. The first execution assembly comprises a first cylinder body, a first push rod and a first roller lead screw, and the first roller lead screw can convert rotary motion output by the planet carrier into linear reciprocating motion; the second execution assembly comprises a second cylinder body, a second push rod and a second roller lead screw. The second roller lead screw can convert rotary motion output by the planet carrier into linear reciprocating motion. According to the utility model, the bearing capacity is improved, the noise is reduced, the service life is prolonged, the stroke is improved, the mechanical transmission efficiency is improved, the power density is improved, the standardization level is improved and the cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of drive devices, in particular to a reciprocating drive unit. Background Art

[0002] Devices such as piston high-pressure pumps and high-pressure compressors require the use of the linear reciprocating motion of the piston to form a high-pressure fluid. In these devices, a crank-connecting rod mechanism is usually used to convert the rotational motion into linear reciprocating motion, thereby using the crank-connecting rod mechanism to drive the piston to reciprocate linearly.

[0003] The solution of using a crank-connecting rod mechanism to drive the piston to reciprocate linearly has the following technical problems:

[0004] According to the motion characteristics of the crank-connecting rod mechanism, there is a large radial friction force between the piston and the cylinder wall during the movement of the piston, which will accelerate the wear of the piston and the cylinder wall, thereby causing problems such as increased leakage, reduced pressure, reduced volumetric efficiency and shortened service life.

[0005] Limited by the crank eccentricity, the stroke of the existing piston is limited;

[0006] There is relative rotation between the crank and the connecting rod, and between the connecting rod and the piston, resulting in high heat generation and low mechanical transmission efficiency.

[0007] The sinusoidal motion of the crank-connecting rod mechanism causes the piston speed to fluctuate, which in turn has an adverse effect on the flow stability of the high-pressure fluid;

[0008] Using a crank-connecting rod mechanism to drive the piston to reciprocate linearly has the problem of low power density, which is not conducive to standardized combination. Utility Model Content

[0009] The purpose of the utility model is to provide a reciprocating drive unit and a vehicle to alleviate or eliminate at least one of the above-mentioned technical problems.

[0010] The utility model discloses a reciprocating drive unit, comprising a housing, a first motor, a second motor, a first transmission assembly, a second transmission assembly, a planetary gear reduction assembly, a first actuator assembly and a second actuator assembly;

[0011] The planetary gear reduction assembly comprises a sun gear, an inner gear ring, a planet carrier and a plurality of planetary gears mounted on the planet carrier, wherein the sun gear, the inner gear ring and the planet carrier are rotatably mounted in the housing, respectively, and the plurality of planetary gears are meshed between the sun gear and the inner gear ring;

[0012] The first motor and the second motor are respectively mounted on the housing, the first transmission assembly and the second transmission assembly are respectively mounted in the housing, the first transmission assembly is transmission-connected between the first motor and the sun gear, the first transmission assembly can transmit the rotational motion output by the first motor to the sun gear, the second transmission assembly is transmission-connected between the second motor and the inner gear ring, the second transmission assembly can transmit the rotational motion output by the second motor to the inner gear ring;

[0013] The first actuator assembly includes a first cylinder body installed on the left side of the housing, a first push rod matched with the first cylinder body, and a first roller screw arranged in the first cylinder body, the first roller screw is drivingly connected between the planet carrier and the first push rod, and the first roller screw can convert the rotational motion output by the planet carrier into a linear reciprocating motion to drive the first push rod to perform a linear reciprocating motion;

[0014] The second actuator includes a second cylinder body installed on the right side of the housing, a second push rod cooperating with the second cylinder body, and a second roller screw arranged in the second cylinder body. The second roller screw is transmission-connected between the planetary carrier and the second push rod. The second roller screw can convert the rotational motion output by the planetary carrier into linear reciprocating motion to drive the second push rod to perform linear reciprocating motion.

[0015] Optionally, a central axis of the first roller screw, a central axis of the second roller screw, and a central axis of the planet carrier are collinear.

[0016] Optionally, the output end of the first push rod is arranged to face left, and the output end of the second push rod is arranged to face right.

[0017] Optionally, the first transmission assembly and the second transmission assembly are respectively gear transmission assemblies.

[0018] Optionally, the first transmission assembly includes a first gear mounted on the output shaft of the first motor, a second gear mounted on the sun gear, and a first duplex gear meshed between the first gear and the second gear.

[0019] Optionally, the second transmission assembly includes a third gear mounted on the output shaft of the second motor, a fourth gear mounted on the sun gear, and a second double gear meshed between the third gear and the fourth gear.

[0020] Optionally, an adapter sleeve is further included, wherein the lead screw of the first roller screw and the lead screw of the second roller screw are respectively connected to the inner spline of the adapter sleeve, and the planet carrier is connected to the outer spline of the adapter sleeve.

[0021] Optionally, the left end of the inner gear ring and the right end of the inner gear ring are respectively supported on the housing via a first bearing; the adapter sleeve is spline-connected to the right end of the planet carrier, and the left end of the planet carrier and the adapter sleeve are respectively supported on the housing via a second bearing; the left end of the sun gear is supported on the housing via a third bearing, and the right end of the sun gear is supported on the planet carrier via a fourth bearing.

[0022] Optionally, the nut of the first roller screw is fixedly connected to the first push rod, and the nut of the second roller screw is fixedly connected to the second push rod.

[0023] Optionally, the housing includes a first housing member, a second housing member, a third housing member, a fourth housing member and a fifth housing member connected in sequence from left to right, the first transmission assembly is installed between the first housing member and the second housing member, the second transmission assembly is installed between the second housing member and the third housing member, and the fourth housing member surrounds the periphery of the inner gear ring.

[0024] The utility model uses a roller screw to convert rotary motion into linear motion, which helps to improve load-bearing capacity, reduce noise, increase life, increase stroke, improve mechanical transmission efficiency, and reduce speed fluctuation of the push rod. The utility model uses a planetary gear reduction assembly to synthesize the rotary motion output by two motors, and uses two actuators to output linear motion respectively, which helps to improve power density, improve standardization level and reduce cost, and also helps to ensure the life of the two motors. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of a reciprocating drive unit described in some embodiments;

[0026] Figure 2 for Figure 1 A partial enlarged view of .

[0027] Among them, 1-housing; 2-first motor; 3-second motor; 4-first transmission assembly; 5-second transmission assembly; 6-planetary gear reduction assembly; 7-adapter sleeve; 8-first actuator assembly; 9-second actuator assembly;

[0028] 101-first housing member; 102-second housing member; 103-third housing member; 104-fourth housing member; 105-fifth housing member;

[0029] 401-first gear; 402-fifth gear; 403-sixth gear; 404-second gear; 405-first gear shaft;

[0030] 501-third gear; 502-seventh gear; 503-eighth gear; 504-fourth gear; 505-second gear shaft;

[0031] 601-sun gear; 602-inner ring gear; 603-planet carrier; 604-planet gear;

[0032] 801-first cylinder body; 802-first push rod; 803-first lead screw; 804-first nut; 805-extension rod section;

[0033] 901 - second cylinder body; 902 - second push rod; 903 - second lead screw; 904 - second nut. DETAILED DESCRIPTION

[0034] The following will describe the implementation of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, not for limiting the scope of protection of the present invention.

[0035] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0036] like Figure 1 and Figure 2A reciprocating drive unit shown in the figure includes a housing 1, a first motor 2, a second motor 3, a first transmission assembly 4, a second transmission assembly 5, a planetary gear reduction assembly 6, a first actuator assembly 8 and a second actuator assembly 9; the planetary gear reduction assembly 6 includes a sun gear 601, an inner gear ring 602, a planet carrier 603 and a plurality of planetary gears 604 rotatably mounted on the planet carrier 603 through gear shafts, the sun gear 601, the inner gear ring 602 and the planet carrier 603 are rotatably mounted in the housing 1, and the plurality of planetary gears 604 are meshed between the sun gear 601 and the inner gear ring 602; the first motor 2 and the second motor 3 are respectively mounted on the housing 1, the first transmission assembly 4 and the second transmission assembly 5 are respectively mounted in the housing 1, the first transmission assembly 4 is transmission-connected between the first motor 2 and the sun gear 601, the first transmission assembly 4 can transmit the rotational motion output by the first motor 2 to the sun gear 601, and the second transmission assembly 5 is transmission-connected between the second motor 3 and the inner gear ring 60 2, the second transmission assembly 5 can transmit the rotational motion output by the second motor 3 to the inner gear ring 602; the first actuator assembly 8 includes a first cylinder body 801 installed on the left side of the housing 1, a first push rod 802 cooperating with the first cylinder body 801, and a first roller screw arranged in the first cylinder body 801, the first roller screw is transmission-connected between the planet carrier 603 and the first push rod 802, the first roller screw can convert the rotational motion output by the planet carrier 603 into a linear reciprocating motion, so as to drive the first push rod 802 to perform a linear reciprocating motion; the second actuator assembly 9 includes a second cylinder body 901 installed on the right side of the housing 1, a second push rod 902 cooperating with the second cylinder body 901, and a second roller screw arranged in the second cylinder body 901, the second roller screw is transmission-connected between the planet carrier 603 and the second push rod 902, the second roller screw can convert the rotational motion output by the planet carrier 603 into a linear reciprocating motion, so as to drive the second push rod 902 to perform a linear reciprocating motion.

[0037] By adopting the above technical solution, the rotary motion is converted into linear motion by using a roller screw. The roller screw has the characteristics of high efficiency and strong load-bearing capacity, which helps to improve the load-bearing capacity and mechanical transmission efficiency of the reciprocating drive unit. According to the motion characteristics of the roller screw, the movement direction of the nut of the roller screw is consistent with the direction of the central axis of the push rod, which helps to reduce the noise of the reciprocating drive unit and the device driven by the reciprocating drive unit, helps to improve the life of the reciprocating drive unit and the device driven by the reciprocating drive unit, and helps to reduce the speed fluctuation of the push rod, thereby ensuring the flow stability of the high-pressure fluid in the device driven by the reciprocating drive unit. In addition, due to the use of the roller screw, the stroke of the reciprocating drive unit is adjustable, and the stroke of the roller screw is less restricted than the stroke of the crank-connecting rod mechanism, which helps to improve the stroke of the reciprocating drive unit.

[0038] In the above technical solution, the planetary gear reduction assembly 6 is used to synthesize the rotational motion output by the two motors, and the two actuators are used to output linear motion respectively. The planetary gear reduction assembly 6 can increase the torque, and the two actuators output linear motion respectively, which helps to improve the power density, improve the standardization level and reduce the cost. In the specific implementation, one reciprocating drive unit can drive two pistons. The reciprocating drive unit constitutes a modular unit, which can be standardized and combined to meet different power requirements by increasing or decreasing the number of reciprocating drive units.

[0039] Since the motor has the problems of high power consumption and easy damage under the condition of frequent forward and reverse rotation, in the above technical solution, the planetary gear reduction assembly 6 is used to synthesize the rotational motion output by the two motors, and the rotation direction of the planet carrier 603 can be changed by adjusting the rotation speed of the first motor 2 and the second motor 3, that is, the forward and reverse rotation of the planet carrier 603 is achieved by motion synthesis and speed difference change. Without changing the rotation direction of the first motor 2 and the second motor 3, the reciprocating motion of the first push rod 802 and the second push rod 902 can also be achieved, which helps to ensure the life of the first motor 2 and the second motor 3.

[0040] It should also be noted that the above-mentioned reciprocating drive unit combines the planetary gear reduction assembly 6 and the two roller screws to transmit and convert the rotational motion into linear reciprocating motion, and is particularly suitable for driving a high-power fluid piston pump (1000CC, 35mpa or above), and can meet the performance requirements of a high-power fluid piston pump.

[0041] In some embodiments, the central axis of the first roller screw, the central axis of the second roller screw, and the central axis of the planet carrier 603 are collinear. With the above technical solution, the rotational motion of the planet carrier 603 can be better transmitted to the first roller screw and the second roller screw. In specific implementation, the central axis of the first roller screw, the central axis of the second roller screw, the central axis of the planet carrier 603, the central axis of the first push rod 802, and the central axis of the second push rod 902 are collinear and extend in the left-right direction.

[0042] In some embodiments, the output end of the first push rod 802 is set to the left, and the output end of the second push rod 902 is set to the right. The first push rod 802 and the second push rod 902 are in opposite directions, and can drive two piston pumps respectively, which helps to improve the power density of the reciprocating drive unit.

[0043] In some embodiments, the first transmission assembly 4 and the second transmission assembly 5 are gear transmission assemblies, respectively. The gear transmission assembly has the characteristics of being easy to realize, easy to maintain and having a strong load-bearing capacity.

[0044] In some embodiments, the first transmission assembly 4 includes a first gear 401 mounted on the output shaft of the first motor 2, a second gear 404 mounted on the sun gear 601, and a first duplex gear meshed between the first gear 401 and the second gear 404. The first duplex gear includes a first gear shaft 405, a fifth gear 402 fixedly connected to the first gear shaft 405, and a sixth gear 403 fixedly connected to the first gear shaft 405, the fifth gear 402 meshes with the first gear 401, the sixth gear 403 meshes with the second gear 404, and the first gear shaft 405 is rotatably supported on the housing 1 through a bearing. The first duplex gear is used to transmit between the first gear 401 and the second gear 404, which has the characteristic of easy layout.

[0045] In some embodiments, the second transmission assembly 5 includes a third gear 501 mounted on the output shaft of the second motor 3, a fourth gear 504 mounted on the sun gear 601, and a second duplex gear meshed between the third gear 501 and the fourth gear 504. The second duplex gear includes a second gear shaft 505, a seventh gear 502 fixedly connected to the second gear shaft 505, and an eighth gear 503 fixedly connected to the second gear shaft 505, the seventh gear 502 meshes with the third gear 501, the eighth gear 503 meshes with the fourth gear 504, and the second gear shaft 505 is rotatably supported on the housing 1 through a bearing. The second duplex gear is used to transmit between the third gear 501 and the fourth gear 504, which has the characteristic of easy layout.

[0046] In some embodiments, the reciprocating drive unit further includes an adapter sleeve 7, the first lead screw 803 of the first roller screw and the second lead screw 903 of the second roller screw are respectively connected to the internal spline of the adapter sleeve 7, and the planet carrier 603 is connected to the external spline of the adapter sleeve 7. The provision of a connecting sleeve can reduce the difficulty of assembling the reciprocating drive unit. In a specific implementation, the right end of the first lead screw 803 is provided with an extension rod segment 805 extending to the right, and the extension rod segment 805 is used to pass through the center hole of the planet carrier 603 and connect to the internal spline of the connecting sleeve, and the left end of the second lead screw 903 is directly connected to the internal spline of the adapter sleeve 7.

[0047] In some embodiments, the left end of the inner gear ring 602 and the right end of the inner gear ring 602 are supported on the housing 1 through the first bearing, and the two first bearings are sleeved on the periphery of the inner gear ring 602; the adapter sleeve 7 is splined with the right end of the planetary carrier 603, and the left end of the planetary carrier 603 and the adapter sleeve 7 are supported on the housing 1 through the second bearing, and the two second bearings are sleeved on the left end of the planetary carrier 603 and the periphery of the adapter sleeve 7; the left end of the sun gear 601 is supported on the housing 1 through the third bearing, and the third bearing is sleeved on the periphery of the left end of the sun gear 601, and the right end of the sun gear 601 is supported on the planetary carrier 603 through the fourth bearing, and the fourth bearing is arranged between the outer cylindrical surface of the right end of the sun gear 601 and the inner cylindrical surface of the right part of the planetary carrier 603. The above technical solution and the reasonable arrangement of the bearings can ensure the stable operation of the planetary gear reduction assembly 6, and also have the characteristics of easy assembly.

[0048] In some embodiments, the first nut 804 of the first roller screw is fixedly connected to the first push rod 802, and the second nut 904 of the second roller screw is fixedly connected to the second push rod 902. The first nut 804 can be used to drive the first push rod 802 to reciprocate, and the second nut 904 can be used to drive the second push rod 902 to reciprocate.

[0049] In some embodiments, the housing 1 includes a first housing member 101, a second housing member 102, a third housing member 103, a fourth housing member 104, and a fifth housing member 105 connected in sequence from left to right, the first transmission assembly 4 is installed between the first housing member 101 and the second housing member 102, the second transmission assembly 5 is installed between the second housing member 102 and the third housing member 103, and the fourth housing member 104 surrounds the periphery of the inner gear ring 602. By adopting the above technical solution, the housing 1 is split into multiple housing members 1, which helps to reduce the difficulty of assembling the reciprocating drive unit. In a specific implementation, the first housing member 101, the second housing member 102, the third housing member 103, the fourth housing member 104, and the fifth housing member 105 can be fastened together by bolts.

[0050] As a preferred example, the first motor 2 and the second motor 3 are fixedly connected to the left and right sides of the shell 1 respectively, the first motor 2 is fixedly connected to the upper part of the first shell member 101, and the second motor 3 is fixedly installed on the upper part of the third shell member 103.

[0051] The above embodiments are only preferred embodiments for fully illustrating the present utility model, and the protection scope of the present utility model is not limited thereto. Equivalent substitutions or changes made by technicians in the technical field on the basis of the present utility model are all within the protection scope of the present utility model. In the description of this specification, the description of reference terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics of the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0052] In the description of the present invention, it should be understood that the terms "left", "right" and the like indicate directions based on the attached Figure 1 and attached Figure 2 The orientations represented by the coordinate system are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention.

Claims

1. A reciprocating drive unit, characterized in that: It includes a housing, a first motor, a second motor, a first transmission assembly, a second transmission assembly, a planetary gear reduction assembly, a first actuator assembly, and a second actuator assembly; The planetary gear reduction assembly comprises a sun gear, an inner gear ring, a planet carrier and a plurality of planetary gears mounted on the planet carrier, wherein the sun gear, the inner gear ring and the planet carrier are rotatably mounted in the housing, respectively, and the plurality of planetary gears are meshed between the sun gear and the inner gear ring; The first motor and the second motor are respectively mounted on the housing, the first transmission assembly and the second transmission assembly are respectively mounted in the housing, the first transmission assembly is transmission-connected between the first motor and the sun gear, the first transmission assembly can transmit the rotational motion output by the first motor to the sun gear, the second transmission assembly is transmission-connected between the second motor and the inner gear ring, the second transmission assembly can transmit the rotational motion output by the second motor to the inner gear ring; The first actuator assembly includes a first cylinder body installed on the left side of the housing, a first push rod matched with the first cylinder body, and a first roller screw arranged in the first cylinder body, the first roller screw is drivingly connected between the planet carrier and the first push rod, and the first roller screw can convert the rotational motion output by the planet carrier into a linear reciprocating motion to drive the first push rod to perform a linear reciprocating motion; The second actuator includes a second cylinder body installed on the right side of the housing, a second push rod cooperating with the second cylinder body, and a second roller screw arranged in the second cylinder body. The second roller screw is transmission-connected between the planetary carrier and the second push rod. The second roller screw can convert the rotational motion output by the planetary carrier into linear reciprocating motion to drive the second push rod to perform linear reciprocating motion.

2. The reciprocating drive unit according to claim 1, characterized in that: The central axis of the first roller screw, the central axis of the second roller screw, and the central axis of the planet carrier are collinear.

3. The reciprocating drive unit according to claim 1, characterized in that: The output end of the first push rod is arranged toward the left, and the output end of the second push rod is arranged toward the right.

4. The reciprocating drive unit according to claim 1, characterized in that: The first transmission assembly and the second transmission assembly are respectively gear transmission assemblies.

5. The reciprocating drive unit according to claim 4, characterized in that: The first transmission assembly includes a first gear mounted on the output shaft of the first motor, a second gear mounted on the sun gear, and a first duplex gear meshed between the first gear and the second gear.

6. The reciprocating drive unit according to claim 4, characterized in that: The second transmission assembly includes a third gear mounted on the output shaft of the second motor, a fourth gear mounted on the sun gear, and a second duplex gear meshed between the third gear and the fourth gear.

7. The reciprocating drive unit according to claim 1, characterized in that: It also includes an adapter sleeve, the lead screw of the first roller screw and the lead screw of the second roller screw are respectively connected to the internal splines of the adapter sleeve, and the planet carrier is connected to the external splines of the adapter sleeve.

8. The reciprocating drive unit according to claim 7, characterized in that: The left end portion of the inner gear ring and the right end portion of the inner gear ring are respectively supported on the housing through a first bearing; the adapter sleeve is spline-connected to the right end portion of the planet carrier, and the left end portion of the planet carrier and the adapter sleeve are respectively supported on the housing through a second bearing; the left end portion of the sun gear is supported on the housing through a third bearing, and the right end portion of the sun gear is supported on the planet carrier through a fourth bearing.

9. The reciprocating drive unit according to claim 1, characterized in that: The nut of the first roller screw is fixedly connected to the first push rod, and the nut of the second roller screw is fixedly connected to the second push rod.

10. The reciprocating drive unit according to claim 1, characterized in that: The housing includes a first housing member, a second housing member, a third housing member, a fourth housing member and a fifth housing member connected in sequence from left to right, the first transmission assembly is installed between the first housing member and the second housing member, the second transmission assembly is installed between the second housing member and the third housing member, and the fourth housing member surrounds the periphery of the inner gear ring.

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