CN209557628U - Connection spline lubrication structure of electric commercial vehicle motor and gearbox - Google Patents

Abstract

The present application discloses a spline lubricating structure for the connection between the electric motor and the gearbox of an electric commercial vehicle, including the output shaft of the motor and the input shaft of the gearbox. The gearbox input shaft cooperates; the motor output shaft is provided with an oil pump, and the power source of the oil pump is the motor output shaft; the outlet of the oil pump is connected to the Connect splines. The utility model adopts the forced lubrication of the oil pump and increases the lubricating oil circuit, so that the lubricating oil in the gearbox can lubricate the connecting splines and take away the heat generated during high-speed operation, which can effectively prolong the service life of the connecting splines and reduce maintenance costs.

Description

Connection spline lubrication structure of electric commercial vehicle motor and gearbox

technical field

The utility model belongs to the technical field of transmission lubrication, in particular to a spline lubrication structure connecting a motor of an electric commercial vehicle and a gearbox.

Background technique

At present, most new energy electric vehicles use a motor connected to a gearbox with two or more gears. Unlike traditional cars, the motor and gearbox are directly connected through splines, eliminating the clutch system in traditional cars. In traditional cars, the clutch system needs to be maintained and replaced regularly, and the connecting splines also need to be cleaned and maintained. In new energy vehicles, the clutch system is canceled, which saves the maintenance of the clutch system, and the motor and gearbox The connecting spline has not been maintained for a long time at high speed, and it has been operated at high temperature and high speed for a long time, which makes the connecting spline easy to damage. In addition, with the gradual popularization of electric vehicles, the noise and lubrication problems of the powertrain have been paid more and more attention by various vehicle manufacturers. Many vehicle manufacturers require high-speed motors to match corresponding gearboxes. application, of course more noise and lubrication problems.

For example, the utility model patent with application number CN201721214334.4 provides a driving motor and gearbox coupling lubrication structure, including a gearbox input shaft and a drive motor shaft, and a through hole is provided in the axial direction of the gearbox input shaft. The gearbox input shaft is sleeved on the drive motor shaft through the through hole, and a lubricating device is arranged between the gearbox input shaft and the drive motor shaft. In one embodiment, the lubricating device includes a sealing device and a lubricating medium, and the lubricating medium is encapsulated in the sealing device. This scheme greatly reduces the friction at the joint between the motor and the reducer by installing a lubricating device between the gearbox input shaft and the drive motor shaft. On the premise of ensuring the reliability of power transmission, the transmission splines can be lubricated for a long time. ; However, the sealing device and lubricating medium in this scheme need regular maintenance, and this scheme cannot meet the lubrication requirements under high speed conditions.

Utility model content

Aiming at the deficiencies of the prior art, the purpose of this utility model is to provide a spline lubricating structure connecting the electric motor and the gearbox of an electric commercial vehicle. By adding an oil circuit on the output shaft of the motor, the overall lubricating effect of the gearbox is enhanced.

The technical scheme for solving the problem of the utility model is: a spline lubricating structure connecting the motor of an electric commercial vehicle and the gearbox, including the output shaft of the motor and the input shaft of the gearbox, and is characterized in that the output shaft of the motor extends into the transmission The input shaft of the box is matched with the input shaft of the gearbox through the connecting spline; an oil pump is arranged on the output shaft of the motor, and the power source of the oil pump is the output shaft of the motor; the outlet of the oil pump passes through the The oil circuit of the motor output shaft is connected with the connecting spline.

Preferably, the oil passage includes a motor output shaft oil passage arranged axially on the motor output shaft, and the motor output shaft oil passage is connected to the connecting spline.

Preferably, the gearbox input shaft is connected to the gearbox main shaft, the oil passage includes an output shaft oil passage axially arranged in the output shaft of the motor, and the output shaft oil passage has a The oil hole of the key, the output shaft oil passage is connected to the transmission main shaft oil passage arranged in the transmission main shaft through the oil pipe.

Preferably, the main shaft of the gearbox is installed inside the input shaft of the gearbox through a first bearing, and holes are opened on the oil pipe, and lubricating oil can lubricate the first bearing through the holes.

Preferably, said first bearing is an RN taper bearing.

Preferably, the oil pump is positioned on the output shaft of the motor through an oil pump end cover, and the oil pump end cover is provided with an oil seal; the oil pump is connected with the output shaft of the motor through a cylindrical pin.

Preferably, the oil pump is provided with oil pump fixing bolts, and the oil pump fixing bolts are used to connect the stator of the oil pump and the casing of the oil pump together; The part cooperates with the groove, thereby preventing the stator of the oil pump from rotating.

Preferably, the gearbox input shaft is installed in the gearbox through a second bearing, and the oil passage can lubricate the second bearing.

Preferably, the bearing is a conical bearing, and an adjusting shim for adjusting the axial clearance is provided between the conical bearing and the gearbox.

Preferably, the oil pump is an involute gear pump.

Compared with the prior art, the beneficial effects of the utility model are as follows: 1. The output shaft of the motor extends into the input shaft of the gearbox, so that the overall structure is more compact, the maintenance is convenient, and the maintenance cost is lower. 2. There is a corresponding oil circuit for lubrication, so that the connecting splines of the motor and the gearbox are fully lubricated, and the high temperature caused by high-speed operation is not affected and damaged on the connecting splines. 3. The output shaft of the motor is used as the power source of the oil pump. The speed of the oil pump is the same as the output shaft of the motor. The flow rate of the oil pump increases with the increase of the speed, which better meets the lubrication requirements of the gearbox under high-speed operation.

Description of drawings

Fig. 1 is a structural schematic diagram of an embodiment of a spline lubrication structure connecting a motor of an electric commercial vehicle and a gearbox.

Explanation of reference signs: 1-motor output shaft; 2-oil pump end cover; 3-oil seal; 4-oil pump fixing bolt; 5-oil pump; 6-adjusting gasket; 7-second bearing; 8-gearbox input shaft; 9-oil pipe; 10-gearbox main shaft; 11-first bearing; 12-oil passage; 13-oil hole; 14-hole; 15-connecting spline; 16-motor output shaft oil channel; 17-gearbox spindle oil Road; 18 - cylindrical pin.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment, the utility model is described further.

As shown in Figure 1, a connection spline lubrication structure between the motor and gearbox of an electric commercial vehicle includes a motor output shaft 1 and a gearbox input shaft 8; the motor output shaft 1 extends into the inside of the gearbox input shaft 8 and passes through the spline The key 15 cooperates with the gearbox input shaft 8 to make the overall structure more compact; the motor output shaft 1 is provided with an oil pump 5, and the outlet of the oil pump 5 is connected to the connecting spline 15 through the oil passage 12 arranged on the motor output shaft 1; The passage 12 includes a motor output shaft oil passage 16 arranged axially in the motor output shaft 1 , and the motor output shaft oil passage 16 is connected to the connecting spline 15 .

The gearbox input shaft 8 is connected to the gearbox main shaft 10 , and the motor output shaft oil passage 16 is connected to the gearbox main shaft oil passage 17 provided in the gearbox main shaft 10 through the oil pipe 9 . The gearbox main shaft 10 is installed inside the gearbox input shaft 8 through the first bearing 11 ; the first bearing 11 is an RN cone bearing, which can play a supporting role and reduce the deformation of the gearbox main shaft 10 . The oil pipe 9 connects the motor output shaft oil passage 16 and the gearbox main shaft oil passage 17, so that lubricating oil can enter the gearbox main shaft 10 smoothly, and lubricate the gears and bearings at the rear end (not shown in the figure); the oil pipe 9 has a hole 14 , the lubricating oil leaking from the hole 14 can lubricate the first bearing 11; the installation of the oil pipe 9 makes the lubricating effect of the lubricating oil in the whole gearbox better and the flow distribution more uniform.

The oil pump 5 uses the motor output shaft 1 as the power source. The speed of the oil pump 5 is the same as that of the motor output shaft 1. The flow rate of the oil pump 5 increases with the increase of the speed, which better meets the lubrication requirements of the gearbox under high-speed operation. The oil pump 5 is positioned on the motor output shaft 1 through the oil pump end cover 2, and the oil pump end cover 2 is provided with an oil seal 3; the oil pump fixing bolt 4 assembles the oil pump stator and the oil pump shell parts; Groove, the end of the oil pump fixing bolt 4 and the groove of the oil pump end cover 2 have a hole axis fit, so that the stator of the oil pump can be radially fixed to prevent the stator of the oil pump 5 from rotating; the oil pump 5 is connected to the output shaft of the motor through a cylindrical pin 18 1 connected; the cylindrical pin 18 is used for the radial positioning of the rotor of the oil pump 5, which can prevent the rotor of the oil pump 5 from rotating; as the motor output shaft 1 rotates, the oil pump 5 sucks the lubricating oil in the gearbox housing.

The gearbox input shaft 8 is installed in the gearbox through the second bearing 7, and the oil passage 12 is provided with an oil hole 13 leading to the bearing 7, so that the lubricating oil can lubricate the bearing; there is an adjustment between the second bearing 7 and the gearbox. Adjusting shim 6 for axial play.

Further, the second bearing 7 is a tapered bearing.

Further, the oil pump 5 is an involute gear pump.

The utility model is not limited to the above-mentioned embodiments. Without departing from the essential content of the utility model, any deformation, improvement and replacement conceivable by those skilled in the art all fall within the protection scope of the utility model.

Claims (10)

1. A connection spline lubrication structure for an electric commercial vehicle motor and a gearbox, comprising a motor output shaft and a gearbox input shaft, characterized in that: the motor output shaft extends into the gearbox input shaft and passes through the connection spline The key is matched with the input shaft of the gearbox; the output shaft of the motor is provided with an oil pump, and the power source of the oil pump is the output shaft of the motor; the outlet of the oil pump is connected to the The connecting splines. 2. The spline lubricating structure for connecting the motor of an electric commercial vehicle and the gearbox according to claim 1, wherein the oil passage includes a motor output shaft oil passage arranged axially on the motor output shaft, so The motor output shaft oil passage is connected with the connecting spline. 3. The spline lubricating structure for connecting the electric commercial vehicle motor and the gearbox according to claim 1, characterized in that: the gearbox input shaft is connected to the gearbox main shaft, and the oil circuit includes The output shaft oil passage in the output shaft of the motor, the output shaft oil passage has an oil hole leading to the connecting spline, and the output shaft oil passage is connected to the transmission main shaft arranged in the transmission main shaft through an oil pipe oil passage. 4. The spline lubricating structure for connecting the electric commercial vehicle motor and the gearbox according to claim 3, characterized in that: the gearbox main shaft is installed inside the gearbox input shaft through the first bearing, and the oil pipe is There are holes through which lubricating oil can lubricate the first bearing. 5. The spline lubricating structure for the connection between the electric motor and the gearbox of an electric commercial vehicle according to claim 4, wherein the first bearing is an RN taper bearing. 6. The spline lubricating structure for connecting the motor of an electric commercial vehicle and the gearbox according to claim 1, wherein the oil pump is positioned on the output shaft of the motor through an oil pump end cover, and the oil pump end cover is provided with an oil seal; The oil pump is connected with the output shaft of the motor through a cylindrical pin. 7. The spline lubricating structure for connecting the motor of an electric commercial vehicle and the gearbox according to claim 6, characterized in that: the oil pump is provided with an oil pump fixing bolt, and the oil pump fixing bolt is used to connect the stator of the oil pump to the oil pump The casings are connected together; the oil pump end cover is provided with a groove, and the end of the oil pump fixing bolt fits with the groove, thereby preventing the stator of the oil pump from rotating. 8. The spline lubricating structure for connecting the motor of an electric commercial vehicle and the gearbox according to claim 1, characterized in that: the gearbox input shaft is installed in the gearbox through a second bearing, and the oil passage can lubricate all Describe the second bearing. 9. The spline lubricating structure for connecting the motor of an electric commercial vehicle and the gearbox according to claim 8, characterized in that: the bearing is a tapered bearing, and there is a device for adjusting the axial clearance between the tapered bearing and the gearbox. Adjusting washer. 10. The spline lubricating structure for connecting the electric motor and the gearbox of an electric commercial vehicle according to claim 1, wherein the oil pump is an involute gear pump.