Pure electric oscillating cylinder and engineering machinery

Abstract

The pure electric oscillating cylinder comprises a cylinder body, an output shaft, an electric driving mechanism and a quadruple speed reducing mechanism, the output shaft is arranged in the cylinder body and is of a solid structure, and the end, away from an end cover, of the output shaft is of a step-shaped structure; the electric driving mechanism is used for driving the output shaft to rotate; and the quadruple reducing mechanism is arranged between the output shaft and the electric driving mechanism and is used for increasing the torque transmitted to the output shaft by the electric driving mechanism and reducing the rotating speed of the output shaft. The electric driving mechanism, the quadruple reducing mechanism and the output shaft are in transmission connection, so that the output shaft is only in transmission connection with the transition sun gear, the rotation speed ratio of the whole reducing mechanism is further increased through the quadruple reducing mechanism, and torque capable of being output by the oscillating cylinder is increased under the condition that the motor performance is the same.

Description

Technical Field

[0001] The utility model relates to the technical field of oil cylinders, in particular to a pure electric swing cylinder and also to an engineering machine. Background Art

[0002] With the acceleration of the electrification process in the construction machinery industry, aerial work vehicles, as a common type of construction machinery, currently use conventional swing cylinders for the left and right swinging of their working baskets, which are driven by hydraulic pressure.

[0003] The hydraulically driven swing cylinder has the problems of unstable oil pressure and slow response speed in actual application. Therefore, a solution of replacing the hydraulic drive with electric drive is proposed to drive the swing cylinder.

[0004] The existing electric-driven swing cylinder combines a motor structure and a gear reduction transmission structure to control the rotation of the output shaft. The output shaft passes through the reduction transmission structure and is connected to the motor structure. A central through hole is opened on the output shaft to connect the working basket. However, since this structure requires a through hole to be opened on the output shaft, the outer diameter of the output shaft is large, and the diameter of the gear connected to the output shaft is also large, which results in a smaller deceleration ratio of the gear reduction transmission structure. When the motor performance is the same, the torque output by the swing cylinder is reduced.

[0005] In view of this, it is necessary to design a pure electric swing cylinder to solve the above problems. Utility Model Content

[0006] The utility model aims to solve at least one of the technical problems existing in the prior art.

[0007] To this end, the utility model provides a pure electric swing cylinder that can obtain greater output torque.

[0008] The first aspect of the present invention provides a pure electric swing cylinder, comprising:

[0009] Cylinder body;

[0010] An output shaft is disposed in the cylinder body and is a solid structure, with one end of the output shaft away from the end cover being formed into a stepped structure;

[0011] an electric drive mechanism, the electric drive mechanism being used to drive the output shaft to rotate;

[0012] A quadruple reduction mechanism is provided between the output shaft and the electric drive mechanism, and is used to increase the torque transmitted from the electric drive mechanism to the output shaft and reduce the rotational speed of the output shaft.

[0013] Preferably, the quadruple reduction mechanism includes four groups of reduction assemblies, the first to third groups of reduction assemblies all include planetary gears and sun gears, the fourth group of reduction assemblies includes planetary gears and transition sun gears, the planetary gears are connected to the sun gears or the transition sun gears via pins so as to drive the sun gears or the transition sun gears to rotate while the planetary gears revolve.

[0014] Further preferably, the sun gear of the first group of reduction assembly is meshed with the planetary gear of the second group of reduction assembly to drive the second group of reduction assembly to rotate via the first group of reduction assembly; the sun gear of the second group of reduction assembly is meshed with the planetary gear of the third group of reduction assembly to drive the third group of reduction assembly to rotate via the second group of reduction assembly; the sun gear of the third group of reduction assembly is meshed with the planetary gear of the fourth group of reduction assembly to drive the fourth group of reduction assembly to rotate via the third group of reduction assembly, and the transition sun gear of the fourth group of reduction assembly is transmission-connected to the output shaft to drive the output shaft to rotate.

[0015] Preferably, the inner wall of the cylinder body corresponding to the quadruple reduction mechanism portion is provided with transmission teeth, and the transmission teeth are suitable for engaging with the planetary gears in each group of the reduction assembly.

[0016] Further preferably, the electric drive mechanism includes a frameless motor and a motor output shaft, the output end of the frameless motor is transmission-connected to the motor output shaft, and the motor output shaft is transmission-connected to the first group of the reduction assembly at the same time.

[0017] Preferably, the frameless motor is bonded and fixed to the inner wall of the cylinder.

[0018] Further preferably, an end cover is provided at one end of the cylinder body, the end cover is fixed via a locking nut, and a lower limit ring is further provided between the end cover and the frameless motor.

[0019] Preferably, an upper limit ring is provided between the stepped structure of the output shaft and the quadruple reduction mechanism.

[0020] Further preferably, a needle roller bearing is provided between the upper limit ring and the stepped structure of the output shaft.

[0021] The beneficial effects of the present invention are as follows: through the transmission connection between the electric drive mechanism, the quadruple reduction mechanism and the output shaft, the output shaft is only connected to the transition sun gear transmission, and through the quadruple reduction mechanism, the speed ratio of the overall reduction mechanism is further increased, so that when the motor performance is the same, the torque that the swing cylinder can output is increased.

[0022] A second aspect of the present invention provides an engineering machine, which adopts the pure electric swing cylinder described in the first aspect of the present invention.

[0023] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the present invention. The objectives and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] Figure 1 This is a schematic diagram of the internal structure of the pure electric swing cylinder of the present utility model;

[0027] Figure 2 This is a transmission structure diagram of the internal deceleration component of the pure electric swing cylinder of the present utility model.

[0028] Description of reference numerals:

[0029] 1. Cylinder body; 2. Output shaft; 3. Quadruple reduction mechanism; 31. Reduction assembly; 311. Sun gear; 312. Planetary gears; 313. Transition sun gear; 4. Electric drive mechanism; 41. Motor output shaft; 42. Frameless motor; 5. End cover; 6. Lower limit ring; 7. Upper limit ring; 8. Needle roller bearing; 9. Locking nut; 10. Transmission gear. DETAILED DESCRIPTION

[0030] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams that illustrate the basic structure of the present invention only in a schematic manner, and therefore only show components relevant to the present invention. In the description of the present invention, it should be understood that, unless otherwise specified, "multiple" means two or more, "bottom" refers to the bottom of the structure shown in the drawings, and "top" refers to the top of the structure shown in the drawings.

[0031] See also Figures 1 to 2The embodiment of the present invention provides a pure electric swing cylinder, comprising a cylinder body 1, an output shaft 2, an electric drive mechanism 4 and a quadruple reduction mechanism 3. The output shaft 2 is arranged in the cylinder body 1 and is transmission-connected to the output end of the quadruple reduction mechanism 3. The output shaft 2 is configured as a solid structure, and the end of the output shaft 2 away from the end cover is formed into a stepped structure. The input end of the quadruple reduction mechanism 3 is transmission-connected to the electric drive mechanism 4 to increase the torque transmitted to the output shaft 2 by the electric drive mechanism 4 and reduce the rotational speed of the output shaft 2. The output shaft 2 is a solid structure and one end is formed into a stepped structure, so that the output shaft 2 can withstand a large bending moment.

[0032] In some embodiments, the quadruple reduction mechanism 3 includes four groups of reduction assemblies 31, each group of reduction assemblies 31 includes a planetary gear 312 and a sun gear 311, wherein the planetary gear 312 and the sun gear 311 are connected via a pin shaft, and can drive the sun gear 311 to rotate while the planetary gear 312 revolves.

[0033] In some embodiments, the quadruple reduction mechanism 3 is driven to work by an electric drive mechanism 4, wherein the electric drive mechanism 4 includes a frameless motor 42 and a motor output shaft 41, and the motor output shaft 41 is transmission-connected to the frameless motor 42, and the motor output shaft 41 is also transmission-connected to the quadruple reduction mechanism 3, thereby driving the quadruple reduction mechanism 3 to work.

[0034] In addition, the inner wall of the cylinder body 1 is provided with a transmission tooth 10 corresponding to the inner wall of the quadruple reduction mechanism 3, and the transmission tooth 10 is suitable for engaging the planetary gear 312 in each group of reduction assembly 31. The frameless motor 42 is connected to the inner wall of the cylinder body 1 by an adhesive. The quadruple reduction mechanism 3 includes four groups of reduction assemblies 31, and the first to third groups of reduction assemblies 31 all include planetary gears 312 and sun gears 311. The fourth group of reduction assemblies 31 includes planetary gears 312 and transition sun gears 313. The planetary gears 312 are connected to the sun gear 311 or the transition sun gear 313 via a pin shaft so that the sun gear 311 or the transition sun gear 313 can be driven to rotate while the planetary gear 312 revolves.

[0035] In this embodiment, the output shaft 2 used is a solid structure output shaft 2. When the electric drive mechanism 4 drives the quadruple reduction mechanism 3 to rotate, the motor output shaft 41 is connected to the first reduction assembly 31, and the planetary gears 312 of the first reduction assembly 31 are meshed with the meshing teeth on the motor output shaft 41 and the transmission teeth 10 provided on the inner wall of the cylinder 1. The sun gear 311 of the first reduction assembly 31 is located on the side of the planetary gears 312 of the first reduction assembly 31 away from the electric drive mechanism 4; the planetary gears 312 of the second reduction assembly 31 are located between the sun gears 311 of the first reduction assembly 31 and the sun gears 311 of the second reduction assembly 31, and the planetary gears 312 of the second reduction assembly 31 are meshed with the sun gears 311 of the first reduction assembly 31 and the transmission teeth 10 on the inner wall of the cylinder 1. The sun gear 311 of the second reduction assembly 31 is located on the side of the planetary gears 312 of the second reduction assembly 31 away from the electric drive mechanism 4; The planetary gear 312 of the component 31 is located between the sun gear 311 of the third group of reduction assembly 31 and the sun gear 311 of the second group of reduction assembly 31. The planetary gear 312 of the third group of reduction assembly 31 is engaged with the sun gear 311 of the second group of reduction assembly 31 and the transmission teeth 10 on the inner wall of the cylinder body 1. The transition sun gear 313 of the fourth group of reduction assembly 31 is located on the side of the planetary gear 312 of the third group of reduction assembly 31 away from the electric drive mechanism 4. The planetary gear 312 of the fourth group of reduction assembly 31 is located between the transition sun gear 313 of the fourth group of reduction assembly 31 and the sun gear 311 of the third group of reduction assembly 31. The planetary gear 312 of the fourth group of reduction assembly 31 is engaged with the sun gear 311 of the third group of reduction assembly 31 and the transmission teeth 10 on the inner wall of the cylinder body 1, and the transition sun gear 313 of the fourth group of reduction assembly 31 is transmission-connected to the output shaft 2 so as to drive the output shaft 2 to rotate.

[0036] Therefore, when the frameless motor 42 drives the motor output shaft 41 to rotate, the motor output shaft 41 drives the planetary gear 312 of the first reduction assembly 31 to rotate, and the planetary gear 312 of the first reduction assembly 31 revolves around the sun gear 311 of the first reduction assembly 31 while rotating itself, and drives the sun gear 311 of the first reduction assembly 31 to rotate around the axis of the cylinder 1 in the cylinder 1, and then the sun gear 311 of the first reduction assembly 31 drives the planetary gear 312 of the second reduction assembly 31 to rotate, and the planetary gear 312 of the second reduction assembly 31 revolves around the sun gear 311 of the second reduction assembly 31 while rotating itself, and drives the second reduction assembly 31 The sun gear 311 of the first reduction assembly 31 rotates, the sun gear 311 of the second reduction assembly 31 drives the planet gears 312 of the third reduction assembly 31 to rotate, the planet gears 312 of the third reduction assembly 31 revolve around the sun gear 311 of the third reduction assembly 31 while rotating, and drive the sun gear 311 of the third reduction assembly 31 to rotate, the sun gear 311 of the third reduction assembly 31 drives the planet gears 312 of the fourth reduction assembly 31 to rotate, the planet gears 312 of the fourth reduction assembly 31 revolve around the transition sun gear 313 of the fourth reduction assembly 31, and drive the transition sun gear 313 of the fourth reduction assembly 31 to rotate. The transition sun gear 313 of the fourth reduction assembly 31 is in transmission connection with the output shaft 2, thereby driving the output shaft 2 to rotate.

[0037] Therefore, through the above-mentioned transmission connection of the output shaft 2, the output shaft 2 is only connected to the transition sun gear 313, and through the quadruple reduction mechanism 3, the speed ratio of the overall reduction mechanism is further increased, so that when the motor performance is the same, the torque that the swing cylinder can output is increased.

[0038] In addition, an end cap 5 is provided at one end of the cylinder body 1, secured by a locking nut 9. A lower stop ring 6 is provided between the end cap 5 and the frameless motor 42. The end of the output shaft 2 away from the end cap 5 is formed into a stepped structure. An upper stop ring 7 is provided between this stepped structure and the fourth reduction assembly 31 of the quadruple reduction mechanism 3, and a needle roller bearing 8 is provided between the upper stop ring 7 and the stepped structure. Therefore, the provision of the upper stop ring 7 and the lower stop ring 6 can limit the position of the quadruple reduction mechanism 3 and prevent axial movement of the quadruple reduction mechanism 3.

[0039] A specific implementation manner of the present invention is an engineering machine, which adopts the pure electric swing cylinder described in any of the above embodiments, and the engineering machine includes equipment such as a forklift.

[0040] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0041] The above description is based on the ideal embodiment of the present invention. Based on the above description, relevant personnel can make various changes and modifications without departing from the technical scope of this utility model. The technical scope of this utility model is not limited to the content of the specification, but must be determined by the scope of the claims.

Claims

1. A pure electric swing cylinder, characterized in that: include: Cylinder (1); An output shaft (2), the output shaft (2) being arranged in the cylinder body (1), and the output shaft (2) being a solid structure, and an end of the output shaft (2) away from the end cover (5) being formed into a stepped structure; An electric drive mechanism (4), the electric drive mechanism (4) being used to drive the output shaft (2) to rotate; A quadruple reduction mechanism (3) is provided between the output shaft (2) and the electric drive mechanism (4), and is used to increase the torque transmitted from the electric drive mechanism (4) to the output shaft (2) and reduce the rotational speed of the output shaft (2).

2. The pure electric swing cylinder according to claim 1, characterized in that: The quadruple reduction mechanism (3) includes four groups of reduction assemblies (31), wherein the first to third groups of reduction assemblies (31) each include a planetary gear (312) and a sun gear (311), and the fourth group of reduction assemblies (31) includes a planetary gear (312) and a transition sun gear (313), wherein the planetary gear (312) is connected to the sun gear (311) or the transition sun gear (313) via a pin shaft so as to drive the sun gear (311) or the transition sun gear (313) to rotate while the planetary gear (312) revolves.

3. The pure electric swing cylinder according to claim 2, characterized in that: The sun gear (311) of the first group of reduction components (31) is meshed with the planet gear (312) of the second group of reduction components (31) to drive the second group of reduction components (31) to rotate via the first group of reduction components (31); the sun gear (311) of the second group of reduction components (31) is meshed with the planet gear (312) of the third group of reduction components (31) to drive the third group of reduction components (31) to rotate via the second group of reduction components (31); the sun gear (311) of the third group of reduction components (31) is meshed with the planet gear (312) of the fourth group of reduction components (31) to rotate via the third group of reduction components (31); the transition sun gear (313) of the fourth group of reduction components (31) is transmission-connected to the output shaft (2) to drive the output shaft (2) to rotate.

4. The pure electric swing cylinder according to claim 3, characterized in that: Transmission teeth (10) are provided on the inner wall of the cylinder body (1) corresponding to the quadruple reduction mechanism (3), and the transmission teeth (10) are suitable for engaging with the planetary gears (312) in each group of the reduction assemblies (31).

5. The pure electric swing cylinder according to claim 3, characterized in that: The electric drive mechanism (4) comprises a frameless motor (42) and a motor output shaft (41), wherein the output end of the frameless motor (42) is in transmission connection with the motor output shaft (41), and the motor output shaft (41) is simultaneously in transmission connection with the first group of the reduction assembly (31).

6. The pure electric swing cylinder according to claim 5, characterized in that: The frameless motor (42) is bonded and fixed to the inner wall of the cylinder body (1).

7. The pure electric swing cylinder according to claim 6, characterized in that: An end cover (5) is provided at one end of the cylinder body (1), the end cover (5) is fixed via a locking nut (9), and a lower limit ring (6) is further provided between the end cover (5) and the frameless motor (42).

8. The pure electric swing cylinder according to claim 7, characterized in that: An upper limit ring (7) is provided between the stepped structure of the output shaft (2) and the quadruple reduction mechanism (3).

9. The pure electric swing cylinder according to claim 8, characterized in that: A needle roller bearing (8) is provided between the upper limit ring (7) and the stepped structure of the output shaft (2).

10. An engineering machine, characterized in that: It comprises the pure electric swing cylinder as claimed in any one of claims 1 to 9.

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