Compact high-power-density power takeoff

Abstract

A compact high-power-density power takeoff comprises a shell, a driving shaft arranged in the shell, an inner spline arranged on the driving shaft in a sleeving mode and an upper gear device arranged on the side of the shell. One end of the driving shaft is an input end, and the other end is an output end. A groove is formed in the end, close to the output end, of the inner spline. The gear-up device comprises a piston space arranged on the inner side of the shell, a piston arranged in the piston space, a connecting piece arranged on the side, close to the output end, of the piston, an air cavity formed in the piston space, an air inlet hole communicated with the air cavity, and an air outlet hole communicated with the air cavity. And the spring is arranged in the piston space. According to the compact high-power-density power takeoff, the central axis of the input end and the central axis of the output end are arranged on the same straight line, and the shell is combined with the internal spline to be in parallel with the action of the piston space, so that the compact high-power-density power takeoff is more compact in structure.

Description

Technical Field

[0001] The utility model relates to the field of machinery, in particular to a compact high-power density power take-off. Background Art

[0002] A power take-off is a group or multiple groups of speed gears, also known as a power output device. It is generally composed of a gearbox, a clutch, and a controller. It is connected to the low-speed gear of the gearbox or the output shaft of the auxiliary box to output power to an external working device, such as a lifting pump. Depending on the control method, the power take-off has mechanical control, hydraulic control, pneumatic control, vacuum source control, and electronic control, among which pneumatic control is more common. The pneumatic control power take-off uses air intake to push the upshift, and uses the pressure generated by high-pressure gas on low-pressure gas to control the upshift device.

[0003] As new energy vehicle models increase their market share, the strength requirements for their matching gearboxes and power take-offs are further increased. Chinese patent publication number CN202222161178.7 A compact broken-shaft power take-off, its structure, including a box, an active input group, a concentric output group, a transition group, a broken-shaft output group and a sealed transmission assembly, the bottom side of the box is provided with an active input group, one end of the active input group is provided with a concentric output group, the top of the active output group is provided with a transition group, the top of the transition group is provided with a broken-shaft output group, and the outer sides of the ends of the active input group and the concentric output group are both provided with sealed transmission assemblies. The compact broken-shaft power take-off reduces the overall volume of the power take-off through a three-stage structure, and there is no need to add other auxiliary gears to the output shaft of the power take-off, and the needle bearings are used reasonably to effectively reduce the overall thickness and reduce the space occupied by parts, thereby making the overall structure compact.

[0004] However, the above power take-off does not solve the problem that the input and output shafts in the power take-off are separately arranged, resulting in an excessively large volume. The overall volume of the power take-off is large and not compact enough. Utility Model Content

[0005] In view of this, the utility model provides a compact high power density power take-off that can solve the above problems and meet the above needs.

[0006] A compact high power density power take-off device comprises a housing, a drive shaft arranged in the housing, an internal spline sleeved on the drive shaft, and a shifting device arranged on the housing side. One end of the drive shaft is an input end, and the other end is an output end. The internal spline is movably sleeved on the outer side wall of the input end, and the rotation of the internal spline drives the drive shaft to rotate. The shifting device comprises a piston space arranged on the inner side of the housing, a piston arranged in the piston space, a connecting piece arranged on the side of the piston close to the output end, an air cavity arranged in the piston space close to the output end, an air inlet hole connected to the air cavity, and a spring arranged in the piston space. The piston slides along the central axis of the drive shaft. A groove is arranged at one end of the internal spline close to the output end. The connecting piece is sleeved on the groove and connected to the piston. The spring is sleeved on the outer side wall of the internal spline. One end of the spring is arranged on the inner side wall of the housing, and the other end is against the end of the piston facing the input end. The piston can drive the internal spline to slide in the direction in which the output end and the input end are arranged.

[0007] Furthermore, the output end is provided with a second internal spline.

[0008] Furthermore, the piston space is composed of the spacing space between the housing and the internal spline.

[0009] Furthermore, both ends of the piston are sealed with the inner wall of the housing and the middle position of the piston is spaced apart from the inner wall of the housing to form the air cavity.

[0010] Furthermore, one end of the air inlet is connected to the outer wall of the shell, and the other end is connected to the air cavity.

[0011] Furthermore, the spring is arranged on a side close to the input end, the spring is squeezed when it is in gear, and returns to a natural state when it is out of gear, pushing the piston to move toward the direction of the output end.

[0012] Compared with the prior art, the compact high power density power take-off provided by the utility model places the input end and the output end of the drive shaft on the same shaft and shortens the axial distance between the input end and the output end, so that the volume proportion of the shaft where the input end and the output end are located in the compact high power density power take-off is reduced, thereby making the compact high power density power take-off more compact. At the same time, the upper gear device is provided to control the displacement of the internal spline, thereby controlling the separation of the internal spline from the transmission to complete the gear shifting. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1A cross-sectional view of a compact high power density power take-off provided by the utility model.

[0014] Figure 2 This is a schematic structural diagram of a compact high power density power take-off provided by the utility model. DETAILED DESCRIPTION

[0015] The specific embodiments of the present invention are further described in detail below. It should be understood that the description of the embodiments of the present invention herein is not intended to limit the protection scope of the present invention.

[0016] like Figure 1 As shown, it is a schematic diagram of the structure of a compact high power density power take-off provided by the utility model. The compact high power density power take-off includes a housing 11, a drive shaft 12 arranged in the housing 11, an internal spline 13 sleeved on the drive shaft, and an upper gear device 14 arranged on the side of the housing 11. It can be imagined that the compact high power density power take-off also includes some other functional modules, such as sealing holes, detection devices, etc., which are well known to those skilled in the art and will not be repeated here.

[0017] The material used for the shell 11 is die-cast aluminum alloy material, which is produced by die-casting. Compared with the production method of first stamping and then welding, die-casting production makes full use of the low-density characteristics of aluminum alloy on large-sized castings, thereby greatly reducing the mass of the castings. At the same time, under the chilling effect and pressure of the die-casting mold, the hardness, strength and tensile resistance of the casting surface are enhanced. The shell 11 is used to carry the above-mentioned functional modules, so the shell 11 is provided with a variety of functional structures, such as screws, bolts, clamps, etc. to complete the installation and assembly of the above-mentioned functional modules. It can be set according to actual needs and will not be described in detail one by one here.

[0018] One end of the drive shaft 12 is an input end 121, and the other end is an output end 122. The surface of the drive shaft 12 is smooth, so that the internal spline 13 can slide on the drive shaft 12. The output end 122 is provided with a second internal spline 1221, which is used to transmit the force from the input end 121 to the load gear pump connected to the output end 122. The input end 121 and the output end 122 adopt a coaxial design, which can reduce the axial distance by two-thirds compared with the non-coaxial design at the same power. The compact high power density power take-off reduces the volume of the housing 11 by reducing the axial distance between the input end 121 and the output end 122.

[0019] The internal spline 13 is movably mounted on the outer wall of the input end 121, and the rotation of the internal spline 13 drives the drive shaft 12 to rotate. The internal spline 13 is used to connect the transmission to take power from the transmission. When shifting up, the internal spline 13 is connected to the transmission power take-off shaft, and when shifting out of gear, the internal spline 13 is disengaged from the transmission power take-off shaft. The connection method between the internal spline 13 and the transmission power take-off shaft is a common technology and will not be described here. The internal spline 13 is connected to the transmission to take power and transmit it to the drive shaft 12. The structure of the internal spline 13 is related to the shifting device 14, and will be specifically described in conjunction with the shifting device 14.

[0020] The shifting device 14 includes a piston space 141 disposed inside the housing 11, a piston 142 disposed in the piston space 141, a connecting piece 143 disposed on the side of the piston 142 close to the output end 122, an air cavity 144 disposed in the piston space 141 close to the output end 122, an air inlet 145 connected to the air cavity, and a spring 146 disposed in the piston space 141. The piston space 141 is composed of the interval space between the housing 11 and the internal spline 13, and is used to provide a moving space for the piston 142.

[0021] The two ends of the piston 142 are sealed with the inner wall of the housing 11 through sealing members, such as sealing rings, and the middle position is spaced apart from the inner wall of the housing 11 to form the air cavity 144. The piston 142 can slide along the central axis of the drive shaft 12.

[0022] The inner spline 13 is provided with a groove 131 at one end close to the output end 122. The connecting member 143 is sleeved on the groove 131 and connected to the piston 142, so that the piston 142 is connected to the inner spline 13 to drive the inner spline 13 to move axially, but will not rotate with the inner spline 13. When shifting up and down, the piston 142 drives the inner spline 13 to slide in the direction in which the output end 122 and the input end 121 are arranged.

[0023] The air cavity 144 is connected to the air inlet 145 and is used for storing and releasing high-pressure gas.

[0024] One end of the air inlet 145 is connected to the outer wall of the housing 11, and the other end is connected to the air cavity 144. The air inlet 145 is used to control the high-pressure gas to enter and exit the housing 11. When the gear is up, the high-pressure gas enters the air cavity 144 from the air inlet 145, pushing the piston 142 to move toward the direction of the input end 121. When the gear is disengaged, the high-pressure gas leaves from the air inlet 145.

[0025] The spring 146 is arranged in the piston space 141 near the input end 121. The spring 146 is sleeved on the outer side wall of the inner spline 13. One end of the spring 146 is arranged on the inner side wall of the housing 11, and the other end abuts against the end of the piston 142 facing the input end 121. The spring 146 is squeezed when shifting up, and returns to a natural state when shifting out, pushing the piston 142 to move in the direction of the output end 122.

[0026] When shifting up, high-pressure gas enters the air cavity 144 from the air inlet 145 to push the piston 142 to move in the direction of the input end 121. The piston 142 squeezes the spring 146. The piston 142 pushes the internal spline 13 to connect with the power take-off shaft of the transmission. The internal spline 13 drives the drive shaft 12 to rotate, and the shifting is completed. When disengaging, the high-pressure gas leaves the air inlet 145, and the spring 146 loses pressure and rebounds to push the piston 142 to reset. The resetting of the piston 142 drives the resetting of the internal spline 13, so that the internal spline 13 is separated from the transmission, and the disengagement is completed.

[0027] Compared with the prior art, the compact high power density power take-off provided by the utility model places the input end 121 and the output end 122 of the drive shaft 12 on the same axis, and shortens the axial distance between the input end 121 and the output end 122, so that the volume proportion of the axis where the input end 121 and the output end 122 are located in the compact high power density is reduced, thereby making the compact high power density power take-off more compact. At the same time, the upper gear device 14 is provided to control the displacement of the internal spline 13, thereby controlling the separation of the internal spline 13 from the transmission to complete the gear shifting.

[0028] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modification, equivalent substitution or improvement within the spirit of the present invention are included in the scope of the claims of the present invention.

Claims

1. A compact high power density power take-off, characterized in that: The compact high power density power take-off comprises a housing, a drive shaft arranged in the housing, an internal spline sleeved on the drive shaft, and an upper gear device arranged on the housing side, wherein one end of the drive shaft is an input end, and the other end is an output end, the internal spline is movably sleeved on the outer side wall of the input end, and the rotation of the internal spline drives the drive shaft to rotate, and the upper gear device comprises a piston space arranged on the inner side of the housing, a piston arranged in the piston space, a connecting piece arranged on the side of the piston close to the output end, and a connecting piece arranged on the housing side. An air cavity in the piston space near the output end, an air inlet hole connected to the air cavity, and a spring arranged in the piston space, the piston slides along the central axis of the drive shaft, a groove is arranged at one end of the internal spline near the output end, the connecting piece is sleeved on the groove and connected to the piston, the spring is sleeved on the outer side wall of the internal spline, one end of the spring is arranged on the inner side wall of the shell, and the other end is against the end of the piston facing the input end, and the piston can drive the internal spline to slide in the direction in which the output end and the input end are arranged.

2. The compact high power density power take-off according to claim 1, characterized in that: The output end is provided with a second internal spline.

3. The compact high power density power take-off according to claim 1, characterized in that: The piston space is composed of the space between the housing and the internal spline.

4. The compact high power density power take-off according to claim 1, characterized in that: The two ends of the piston are sealed with the inner wall of the shell, and the middle position of the piston is spaced from the inner wall of the shell to form the air cavity.

5. The compact high power density power take-off according to claim 1, characterized in that: One end of the air inlet hole is connected to the outer wall of the shell, and the other end is connected to the air cavity.

6. The compact high power density power take-off according to claim 1, characterized in that: The spring is arranged on a side close to the input end. The spring is squeezed when it is in gear and returns to a natural state when it is out of gear, pushing the piston to move toward the direction of the output end.

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