Electric fork cross-country rear steering drive axle structure

Abstract

The utility model discloses an electric fork cross-country rear steering drive axle structure which comprises a rear axle body, and the front wall face of the middle of a rear axle shell of the rear axle body is fixedly connected with a rear speed reduction seat of a rear main speed reduction box through bolts. The middle of the rear speed reduction seat is movably connected with a rear axle input shaft through a bearing, and a conical tooth part formed at the rear end of the rear axle input shaft is meshed with an annular gear of a differential mechanism installed in the middle of a rear axle shell of the rear axle body. A middle inner cavity is formed in the middle of the lower portion of the rear main reduction gearbox and communicated with a main inner cavity in the front of the rear main reduction gearbox. When power input is not needed, power transmission of the rear axle connecting shaft and the lower connecting shaft is cut off, and therefore it is guaranteed that a rotating shaft of a driving motor connected with an upper input shaft does not rotate, the rotating shaft is not prone to damage, and the service life is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to drive axle technical field more specifically relates to a kind of electric fork cross-country rear steering drive axle structure. BACKGROUND

[0002] At present, the drive mechanism in electric cross-country fork truck is generally divided into two drive and four drive, for four drive electric cross-country fork truck, its front steering drive axle and rear steering drive axle will be installed with driving motor as power;

[0003] It is generally two driving motors that run simultaneously to provide power to ensure four-wheel drive operation, however, in conventional operation, four-wheel drive operation is very power-consuming, it can be used two drive, and the driving motor of rear drive needs to be stopped running, but since the driving motor of rear drive is connected with rear steering drive axle to transmit power, when the driving motor of rear drive stops running, the rotation of the wheel on rear steering drive axle will drive the rotation of the shaft of the driving motor of rear drive, which is easy to damage the driving motor of rear drive and affect its service life. UTILITY MODEL CONTENTS

[0004] The utility model aims at overcoming the deficiency of prior art, and provides a kind of electric fork cross-country rear steering drive axle structure, it disconnects the power transmission of rear axle connecting shaft and lower connecting shaft when not power input, to ensure that the shaft of driving motor connected with upper input shaft does not rotate, so that it is not easy to be damaged, and the service life is guaranteed.

[0005] The utility model solves the technical problem by the following scheme:

[0006] A kind of electric fork cross-country rear steering drive axle structure, including rear axle main body, the middle part front wall surface of the rear axle housing of rear axle main body is connected with the rear reduction seat of rear main reduction gearbox by bolt fixedly, and the rear reduction seat of rear axle main body is connected with the rear axle input shaft of rear axle main body by bolt fixedly,

[0007] The middle part of the rear reduction seat is movably connected with the rear axle input shaft by bearing, and the tapered tooth portion formed at the rear end of the rear axle input shaft is engaged with the ring gear of differential installed in the middle part of the rear axle housing of rear axle main body,

[0008] The middle part of the lower part of the rear main reduction gearbox is formed with middle inner cavity, and the middle inner cavity is communicated with the main inner cavity at the front part of the rear main reduction gearbox.

[0009] The middle inner cavity is a stepped cavity, which sequentially forms a first stepped section, a second stepped section and a third stepped section with gradually increasing inner diameters from rear to front. A rear mounting groove extending forward is formed in the middle of the rear end face of the lower part of the rear main reduction gearbox. A central through hole is formed in the middle of the front end face of the rear mounting groove, which is communicated with the middle inner cavity. The front part of the rear reduction seat is inserted into the rear mounting groove and fixedly connected with the rear main reduction gearbox. The middle part of the front part of the rear reduction seat is movably connected with the rear axle connecting shaft through a bearing. The rear part of the rear axle connecting shaft is inserted into the rearwardly extending insertion hole formed in the middle of the front end face of the rear axle input shaft. The rear part of the rear axle connecting shaft is inserted into the spline groove formed in the inner side wall of the insertion hole through the spline part of the outer side wall of the rear part of the rear axle connecting shaft. The front part of the rear axle connecting shaft is formed with an inner hub part in the middle inner cavity. The unlocking piston is inserted into the second stepped section and the third stepped section. The front radially extending edge part is formed on the outer side wall of the front part of the unlocking piston and is located in the third stepped section. The outer side wall of the unlocking piston and the outer side wall of the front radially extending edge part are close to the inner side walls of the second stepped section and the third stepped section, and the outer wall surfaces of the outer side walls and the outer side wall of the front radially extending edge part are formed with annular grooves. The sealing rings are nested in the corresponding annular grooves, and the outer side walls of the sealing rings are pressed against the inner side walls of the second stepped section or the third stepped section.

[0010] The middle part of the unlocking piston is formed with a stepped through hole with a smaller rear inner diameter and a larger front inner diameter. The spring seat is inserted into the stepped through hole. The radially extending edge part is formed on the outer side wall of the front part of the spring seat and is located in the front part of the stepped through hole. The rear part of the spring seat is located in the rear part of the stepped through hole. The thrust needle bearing is installed in the front part of the stepped through hole. The rear end face of the radially extending edge part faces the front end face of the thrust needle bearing. The clutch housing is inserted into the middle through hole of the spring seat. The outer hub of the rear part of the clutch housing is inserted into the first stepped section. The inner hub part is located in the first stepped section and is inserted into the outer hub. The inner hub part and the outer hub are provided with a plurality of spacers and friction plates.

[0011] The front part of the clutch housing is fixedly connected with the annular limiting plate extending radially outward. A plurality of mounting holes are formed on the front end face of the spring seat. The parking spring is inserted into the corresponding mounting hole. The front end of the parking spring is pressed against the rear wall face of the annular limiting plate. The rear end of the parking spring is pressed against the rear end face of the corresponding mounting hole.

[0012] The return spring seat is inserted into the third stepped section. The outer side wall of the return spring seat is close to the inner side wall of the third stepped section. The rear end face of the return spring seat is pressed against the front end face of the unlocking piston.

[0013] The front wall plate at the lower part of the main inner cavity of the rear main reduction gearbox is movably connected with the lower connecting shaft through a bearing. The lower output gear is installed on the middle part of the lower connecting shaft through spline cooperation. The rear end of the lower connecting shaft is movably connected with the limiting pressure plate through a bearing. The rear end face of the limiting pressure plate faces the front end face of the return spring seat.

[0014] A plurality of first installation holes are formed on the front end surface of the return spring seat, and all the first installation holes are uniformly distributed on the front end surface of the return spring seat with the center axis of the return spring seat as the center;

[0015] A pressure disc return spring is inserted into each first installation hole, and the rear end of the pressure disc return spring is pressed against the inner end of the first installation hole, and the front end is pressed against the rear end surface of the limiting pressure disc.

[0016] A plurality of first positioning holes are formed on the front end surface of the return spring seat, and all the first positioning holes are uniformly distributed on the front end surface of the return spring seat with the center axis of the return spring seat as the center;

[0017] A radially extending annular groove is formed on the front end inner side wall of each first positioning hole, the rear part of the positioning pin is inserted into the corresponding first positioning hole, the radially extending edge formed on the middle outer side wall of the positioning pin is located in the annular groove, the rear end surface of the positioning pin is pressed against the rear end surface of the annular groove, a front positioning through hole is formed at the corresponding position of the edge of the limiting pressure disc, and the front part of the positioning pin is inserted into the corresponding front positioning through hole.

[0018] All the spacers and friction plates are arranged between the inner hub and the outer hub, the frontmost end is a spacer, and the last end is a friction plate;

[0019] All the friction plates are inserted into the inner hub, the inner tooth part formed on the inner side wall of the middle through hole is engaged with the outer tooth on the inner hub, the inner hub is inserted into the middle through hole of the spacer, and the spline protrusion formed on the outer side of the spacer is inserted into and matched with the spline groove on the outer hub.

[0020] A plurality of pressing through holes are formed on the edge of the front end plate of the outer hub, a pressing pin is inserted into the pressing through hole, the outer side wall of the pressing pin is tightly attached to the inner side wall of the pressing through hole, the rear end surface of the pressing pin is pressed against the front end surface of the frontmost spacer, all the friction plates and spacers are pressed against each other, the rear end surface of the last friction plate is pressed against the front end surface of the pressure bearing plate, a protruding part is formed in the middle of the front end surface of the pressing pin, the protruding part is clamped in the corresponding clamping hole formed on the rear end surface of the spring seat, and the front end surface of the pressing pin is pressed against the rear end surface of the spring seat.

[0021] A limiting column is clamped in the middle of the rear end surface of the lower connecting shaft, the limiting column is inserted into the clutch housing, the rear end of the limiting column is located in the inner hub, a connecting hole is formed in the middle of the rear end surface of the inner hub, a radially extending annular groove is formed on the front end inner side wall of the connecting hole, a wear plug is clamped in the connecting hole, a radially extending part is formed on the front end outer side wall of the wear plug, the rear end surface of the radially extending part is pressed against the rear end surface of the annular groove, and the front end surface of the wear plug is a spherical surface, which is close to the rear end surface of the limiting column.

[0022] The middle part of the main inner cavity is movably connected with a transmission gear through a bearing, the transmission gear is engaged with a lower output gear, the upper part of the main inner cavity is movably connected with an upper input shaft through a bearing, an input gear part is formed on the outer side wall of the middle part of the upper input shaft, the input gear part is engaged with the transmission gear, an axial connecting through hole is formed in the middle part of the upper input shaft, a spline groove is formed on the inner side wall of the rear part of the axial connecting through hole, a sealing cover is clamped on the inner side wall of the front end of the axial connecting through hole, and the rear end of the upper input shaft is inserted into the connecting through hole in the rear wall plate of the upper part of the rear main reduction gearbox.

[0023] The prominent effect of the utility model is:

[0024] Compared with the prior art, it disconnects the power transmission of the rear axle connecting shaft and the lower connecting shaft when no power is input, so that the rotating shaft of the driving motor connected with the upper input shaft does not rotate, so that it is not easy to be damaged, and the service life is guaranteed. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a partial structure schematic view of the prior rear steering drive axle;

[0026] Figure 2 is a partial structure schematic view of the rear steering drive axle of the utility model;

[0027] Figure 3 is a partial structure schematic view when the power transmission of the rear axle connecting shaft and the lower connecting shaft is connected;

[0028] Figure 4 is Figure 3 a partial enlarged view;

[0029] Figure 5 is Figure 3 a partial enlarged view of another part of

[0030] Figure 6 is a partial structure schematic view when the power transmission of the rear axle connecting shaft and the lower connecting shaft is disconnected (the partial structure such as the sealing ring is omitted);

[0031] Figure 7 is Figure 6 a partial enlarged view (the partial structure such as the sealing ring is omitted). DETAILED DESCRIPTION

[0032] In an embodiment, as shown in Figures 2 to 7 Fig. 1, a rear steering drive axle structure of an electric fork off-road vehicle comprises a rear axle body 10, a rear reduction seat 111 of a rear main reduction gearbox 11 is fixedly connected to the middle part of the front wall surface of the rear axle shell of the rear axle body 10 through bolts;

[0033] The middle part of the rear deceleration seat 111 is movably connected with a rear axle input shaft 12 through a bearing, and the rear end of the rear axle input shaft 12 is shaped into a conical tooth part which is engaged with a ring gear of a differential 100 installed in the middle part of the rear axle housing of the rear axle body 10;

[0034] The middle part of the lower part of the rear main deceleration box 11 is shaped into a middle inner cavity which is communicated with the main inner cavity at the front part of the rear main deceleration box 11;

[0035] The middle inner cavity is a stepped cavity which is sequentially formed with a first stepped section 131, a second stepped section 132 and a third stepped section 133 with gradually increasing inner diameters from rear to front, an oil inlet through hole 1 is shaped at the side wall between the second stepped section 132 and the third stepped section 133, the outer end of the oil inlet through hole 1 extends out of the outer wall surface of the rear main deceleration box 11, the middle part of the rear end surface of the lower part of the rear main deceleration box 11 is shaped into a rear mounting groove which extends forward, the middle part of the front end surface of the rear mounting groove is shaped into a central through hole which is communicated with the middle inner cavity, the front part of the rear deceleration seat 111 is inserted into the rear mounting groove and fixedly connected with the rear main deceleration box 11, the middle part of the front part of the rear deceleration seat 111 is movably connected with a rear axle connecting shaft 14 through a bearing, the rear part of the rear axle connecting shaft 14 is inserted into a rearwardly extending insertion hole shaped in the middle part of the front end surface of the rear axle input shaft 12, the rear part of the rear axle connecting shaft 14 is a spline part which is inserted into a spline groove shaped in the inner side wall of the insertion hole, the two are matched, the front part of the rear axle connecting shaft 14 is shaped into an inner hub part 141 which is in the middle inner cavity, the unlocking piston 15 is inserted into the second stepped section 132 and the third stepped section 133, the front part of the unlocking piston 15 is shaped into a front radially extending edge part 151, the front radially extending edge part 151 is in the third stepped section 133, the outer side wall of the unlocking piston 15 and the outer side wall of the front radially extending edge part 151 are close to the inner side wall of the second stepped section 132 and the third stepped section 133, the outer wall surfaces of the two are shaped into annular grooves, sealing rings are nested in the corresponding annular grooves, the outer side wall of the sealing ring is pressed against the inner side wall of the second stepped section 132 or the third stepped section 133;

[0036] The middle part of the unlocking piston 15 is shaped into a stepped through hole with a smaller rear inner diameter and a larger front inner diameter, a spring seat 16 is inserted into the stepped through hole, the front part of the spring seat 16 is shaped into a radially extending edge 161 which is in the front part of the stepped through hole, the rear part of the spring seat 16 is in the middle part of the stepped through hole, a thrust needle bearing 162 is installed in the front part of the stepped through hole, the rear end surface of the radially extending edge 161 faces the front end surface of the thrust needle bearing 162, a clutch housing 17 is inserted into the middle through hole of the spring seat 16, the rear part of the clutch housing 17 is shaped into an outer hub 171 which is inserted into the first stepped section 131, the inner hub part 141 is in the first stepped section 131 and inserted into the outer hub 171, the inner hub part 141 and the outer hub 171 are provided with multiple spacers 142 and friction plates 143;

[0037] The front part of the clutch housing 17 is fixed with an annular limiting plate 1720 extending radially outward, and a plurality of mounting holes are formed on the front end face of the spring seat 16, the parking spring 163 is inserted into the corresponding mounting hole, the front end thereof is pressed against the rear wall face of the annular limiting plate 1720, and the rear end thereof is pressed against the rear end face of the corresponding mounting hole.

[0038] Further, the return spring seat 134 is inserted into the third stepped section 133, the outer side wall of the return spring seat 134 is close to the inner side wall of the third stepped section 133, and the rear end face of the return spring seat 134 is pressed against the front end face of the unlocking piston 15.

[0039] Further, the front wall plate at the lower part of the main inner cavity of the rear main reduction gearbox 11 is movably connected with the lower connecting shaft 18 through a bearing, the middle part of the lower connecting shaft 18 is installed with the lower output gear 181 through a spline fit, the rear end of the lower connecting shaft 18 is movably connected with the limiting pressure plate 19 through a bearing, and the rear end face of the limiting pressure plate 19 is opposite to the front end face of the return spring seat 134.

[0040] Further, a plurality of first mounting holes are formed on the front end face of the return spring seat 134, and all the first mounting holes are uniformly distributed on the front end face of the return spring seat 134 with the center axis of the return spring seat 134 as the center;

[0041] The pressure plate return spring 135 is inserted into each first mounting hole, the rear end of the pressure plate return spring 135 is pressed against the inner end of the first mounting hole, and the front end thereof is pressed against the rear end face of the limiting pressure plate 19.

[0042] Further, a plurality of first positioning holes are formed on the front end face of the return spring seat 134, and all the first positioning holes are uniformly distributed on the front end face of the return spring seat 134 with the center axis of the return spring seat 134 as the center;

[0043] A radially extending annular groove is formed on the front end inner side wall of each first positioning hole, the rear part of the positioning pin 136 is inserted into the corresponding first positioning hole, the radially extending edge formed on the middle part outer side wall of the positioning pin 136 is located in the annular groove, the rear end face of the positioning pin 136 is pressed against the rear end face of the annular groove, a front positioning through hole is formed at the corresponding position of the edge part of the limiting pressure plate 19, and the front part of the positioning pin 136 is inserted into the corresponding front positioning through hole.

[0044] Further, all the spacers 142 and the friction plates 143 are installed between the inner hub part 141 and the outer hub 171 in a spaced manner, the front end is the spacer 142, and the rear end is the friction plate 143;

[0045] All the friction plates 143 are inserted on the inner hub 141, the inner tooth part formed on the inner side wall of the middle through hole is engaged with the outer tooth part on the inner hub 141, the inner hub 141 is inserted in the middle through hole of the spacer 142, the spline projection formed on the outer side part of the spacer 142 is inserted in and matched with the spline groove on the outer hub 171.

[0046] Further, the pressure plate 144 is inserted at the rear end of the inner hub 141, the spline projection formed on the outer side of the pressure plate 144 is inserted in and matched with the spline groove on the outer hub 171, all the spacers 142 and the friction plates 143 are in front of the pressure plate 144;

[0047] The annular clamping groove is formed on the inner side wall of the rear end of the outer hub 171, the clamping ring is clamped in the annular clamping groove, the front end surface of the clamping ring is pressed against the rear end surface of the pressure plate 144.

[0048] Further, the edge part of the front end plate of the outer hub 171 is formed with a plurality of pressing through holes 172, the pressing pin 173 is inserted in the pressing through hole 172, the outer side wall of the pressing pin 173 is tightly attached to the inner side wall of the pressing through hole 172, the rear end surface of the pressing pin 173 is pressed against the front end surface of the frontmost spacer 142, all the friction plates 143 and the spacers 142 are pressed against each other, the rear end surface of the last friction plate 143 is pressed against the front end surface of the pressure plate 144, the front end surface of the pressing pin 173 is formed with a protrusion part in the middle, which is clamped in the corresponding clamping hole formed on the rear end surface of the spring seat 16, the front end surface of the pressing pin 173 is pressed against the rear end surface of the spring seat 16.

[0049] The rear end surface of the lower connecting shaft 18 is clamped with the limiting column 20, the limiting column 20 is inserted in the clutch housing 17, the rear end of the limiting column 20 is in the inner hub 141, the middle part of the rear end surface of the inner hub 141 is formed with a connecting hole, the front end inner side wall of the connecting hole is formed with a radially extending annular groove, the wear plug 21 is clamped in the connecting hole, the radially extending part formed on the front end outer side wall of the wear plug 21 is pressed against the rear end surface of the annular groove, the front end surface of the wear plug 21 is spherical, which is close to the rear end surface of the limiting column 20. This wear plug 21 and the limiting column 20 can ensure the intermediate support between the lower connecting shaft 18 and the rear axle connecting shaft 14.

[0050] The middle part of the main inner cavity is movably connected with a transmission gear 30 through a bearing, the transmission gear 30 is engaged with the lower output gear 18, the upper part of the main inner cavity is movably connected with an upper input shaft 31 through a bearing, an input gear part 32 is formed on the outer side wall of the middle part of the upper input shaft 31, the input gear part 32 is engaged with the transmission gear 30, an axial connecting through hole is formed in the middle part of the upper input shaft 31, a spline groove is formed on the inner side wall of the rear part of the axial connecting through hole, a sealing cover 33 is clamped on the inner side wall of the front end of the axial connecting through hole, and the rear end of the upper input shaft 31 is inserted into the connecting through hole in the rear wall plate of the upper part of the rear main reduction gearbox 11.

[0051] In use, the connection oil pipe at the oil inlet through hole 1 is not connected with oil, at this time, the parking spring 163 is elastically pressed against the rear wall surface of the annular limiting plate 1720, the spring seat 16 is pushed backward, the unlocking piston 15 is moved backward, the edge of the rear end surface of the unlocking piston 15 is pressed against the rear end surface of the second stepped section 132, the rear end surface of the compression pin 173 is pressed against the front end surface of the frontmost spacer 142, all the friction plates 143 and the spacers 142 are pressed against each other, the rear end surface of the last friction plate 143 is pressed against the front end surface of the pressure bearing plate 144, at this time, the output shaft of the driving motor fixed on the rear wall surface of the upper part of the rear main reduction gearbox 11 extends into the axial connecting through hole formed in the middle part of the upper input shaft 31, the spline protrusion on the outer side wall of the output shaft is inserted into the spline groove of the axial connecting through hole of the upper input shaft 31 and cooperates with the spline groove, transmission is realized, the upper input shaft 31 is rotated, the input gear part 32 drives the transmission gear 30 to rotate, the transmission gear 30 drives the lower output gear 18 to rotate, the lower connecting shaft 18 is rotated, and all the friction plates 143 and the spacers 142 are compressed, therefore, the rotation of the lower connecting shaft 18 drives the rotation of the rear axle connecting shaft 14, the rotation of the rear axle connecting shaft 14 drives the rotation of the rear axle input shaft 12, the rotation of the rear axle input shaft 12 drives the operation of the differential 100, thereby realizing the rotation of the two half shafts of the rear axle body 10 and the operation of the corresponding wheel hubs (the rear axle body 10 of the embodiment is basically the same as the existing structure, and will not be described in detail).

[0052] When the driving motor fixed on the rear wall surface of the upper part of the rear main reduction gearbox 11 is not needed to input power, that is, when the operation is stopped, at this time, oil is introduced into the connection oil pipe at the oil inlet through hole 1, the unlocking piston 15 is moved forward, at this time, the parking spring 163 is compressed, the compression plate return spring 135 is compressed, the compression pin 173 is moved forward, the spring seat 16 and the return spring seat 134 are also moved forward, the friction plates 143 and the spacers 142 are separated, and the connection is disconnected, at this time, the rotation of the two half shafts of the rear axle body 10 will not feed back power to the driving motor, the normal use of the driving motor is ensured, the driving motor will not be damaged, and the service life of the driving motor is ensured.

[0053] When the connection oil pipe of the oil inlet through hole 1 stops pressurizing and oiling, the corresponding components are returned through the elastic return of the parking spring 163 and the pressure plate return spring 135, so that the rear end surface of the compression pin 173 is pressed against the front end surface of the frontmost spacer 142, all the friction plates 143 and the spacers 142 are pressed against each other, the rear end surface of the last friction plate 143 is pressed against the front end surface of the pressure bearing plate 144, power transmission is realized, it is ensured that the driving motor can drive the differential 100 to operate, so that the two half shafts of the rear axle body 10 rotate, and the corresponding wheel hub operates.

[0054] Finally, the above embodiments are only used to illustrate the present application, and are not intended to limit the present application. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application. Therefore, all equivalent technical solutions also belong to the scope of the present application, and the patent protection scope of the present application should be defined by the claims.

Claims

1. An electrically all-wheel drive rear transverse drive axle construction comprising a rear axle body (10), characterized in that: The middle part of the rear axle housing of the rear axle body (10) is fixedly connected with the rear reduction seat (111) of the rear main reduction gearbox (11) through bolts; The middle part of the rear reduction seat (111) is movably connected with the rear axle input shaft (12) through a bearing, and the tapered tooth part formed at the rear end of the rear axle input shaft (12) is engaged with the ring gear of the differential (100) installed in the middle part of the rear axle housing of the rear axle body (10); The middle part of the lower part of the rear main reduction gearbox (11) is formed with a middle inner cavity, which is communicated with the main inner cavity at the front part of the rear main reduction gearbox (11); The middle inner cavity is a stepped cavity, which sequentially forms a first stepped section (131), a second stepped section (132) and a third stepped section (133) with gradually increasing inner diameters from rear to front, an oil inlet through hole (1) is formed at the side wall between the second stepped section (132) and the third stepped section (133), the outer end of the oil inlet through hole (1) extends out of the outer wall surface of the rear main reduction gearbox (11), a rear mounting groove extending forward is formed in the middle part of the rear end surface of the lower part of the rear main reduction gearbox (11), a central through hole is formed in the middle part of the front end surface of the rear mounting groove, which is communicated with the middle inner cavity, the front part of the rear reduction seat (111) is inserted into the rear mounting groove and fixedly connected with the rear main reduction gearbox (11), the rear axle connecting shaft (14) is movably connected with the middle part of the front part of the rear reduction seat (111) through a bearing, the rear part of the rear axle connecting shaft (14) is inserted into the rearward extending insertion hole formed in the middle part of the front end surface of the rear axle input shaft (12), the rear part of the rear axle connecting shaft (14) is a spline part which is inserted into the spline groove formed on the inner side wall of the insertion hole, the front part of the rear axle connecting shaft (14) is formed with an inner hub part (141) in the middle inner cavity, the unlocking piston (15) is inserted into the second stepped section (132) and the third stepped section (133), the front part of the unlocking piston (15) is formed with a front radial extension edge (151), the front radial extension edge (151) is located in the third stepped section (133), the outer side wall of the unlocking piston (15) and the outer side wall of the front radial extension edge (151) are close to the inner side wall of the second stepped section (132) and the third stepped section (133), and the outer wall surfaces of the outer side wall of the unlocking piston (15) and the outer side wall of the front radial extension edge (151) are formed with annular grooves, and the sealing rings are nested in the corresponding annular grooves, and the outer side wall of the sealing ring is pressed against the inner side wall of the second stepped section (132) or the third stepped section (133); The middle part of the unlocking piston (15) is formed with a stepped through hole with a small rear inner diameter and a large front inner diameter, a spring seat (16) is inserted into the stepped through hole, a radially extending edge (161) is formed on the front outer side wall of the spring seat (16) and is located in the front part of the stepped through hole, the rear part of the spring seat (16) is located in the middle part of the stepped through hole, a thrust needle bearing (162) is installed in the front part of the stepped through hole, the rear end surface of the radially extending edge (161) faces the front end surface of the thrust needle bearing (162), a clutch housing (17) is inserted into the middle through hole of the spring seat (16), the outer hub (171) of the rear part of the clutch housing (17) is inserted into the first stepped section (131), the inner hub part (141) is located in the first stepped section (131) and is inserted into the outer hub (171), and a plurality of spacers (142) and friction plates (143) are arranged at the inner hub part (141) and the outer hub (171). The front part of the clutch housing (17) is fixedly connected with an annular limiting plate (1720) extending radially outward, a plurality of mounting holes are formed on the front end surface of the spring seat (16), a parking spring (163) is inserted into the corresponding mounting hole, the front end of the parking spring (163) is pressed against the rear wall surface of the annular limiting plate (1720), and the rear end of the parking spring (163) is pressed against the rear end surface of the corresponding mounting hole.

2. An electrically all-wheel drive rear-steering axle structure according to claim 1, characterized in that: The third stepped section (133) is inserted with a return spring seat (134), the outer side wall of the return spring seat (134) is close to the inner side wall of the third stepped section (133), and the rear end surface of the return spring seat (134) is pressed against the front end surface of the unlocking piston (15).

3. An electrically all-wheel drive rear-steering axle structure according to claim 2, characterized in that: The front wall plate at the lower part of the main inner cavity of the rear main reduction gearbox (11) is movably connected with a lower connecting shaft (18) through a bearing, the middle part of the lower connecting shaft (18) is movably connected with a lower output gear (181) through a spline fit, the rear end of the lower connecting shaft (18) is movably connected with a limiting pressure plate (19) through a bearing, and the rear end surface of the limiting pressure plate (19) faces the front end surface of the return spring seat (134).

4. An electrically all-wheel drive rear-steer axle structure according to claim 3, characterized in that: A plurality of first mounting holes are formed on the front end surface of the return spring seat (134), and all the first mounting holes are uniformly distributed on the front end surface of the return spring seat (134) with the center axis of the return spring seat (134) as the center. A pressure plate return spring (135) is inserted into each first mounting hole, the rear end of the pressure plate return spring (135) is pressed against the inner end of the first mounting hole, and the front end of the pressure plate return spring (135) is pressed against the rear end surface of the limiting pressure plate (19).

5. An electrically all-wheel drive rear-steer axle structure according to claim 3, characterized in that: A plurality of first positioning holes are formed on the front end surface of the return spring seat (134), and all the first positioning holes are uniformly distributed on the front end surface of the return spring seat (134) with the center axis of the return spring seat (134) as the center. A radially extending annular groove is formed on the front end inner side wall of each first positioning hole, the rear part of a positioning pin (136) is inserted into the corresponding first positioning hole, a radially extending edge is formed on the middle part outer side wall of the positioning pin (136) and is located in the annular groove, the rear end surface of the positioning pin (136) is pressed against the rear end surface of the annular groove, a front positioning through hole is formed at the corresponding position of the edge part of the limiting pressure plate (19), and the front part of the positioning pin (136) is inserted into the corresponding front positioning through hole.

6. An electrically all-wheel drive rear-steer axle structure according to claim 1, characterized in that: All the spacers (142) and friction plates (143) are arranged between the inner hub (141) and the outer hub (171), the front end is the spacer (142), and the rear end is the friction plate (143); All the friction plates (143) are sleeved on the inner hub (141), the inner tooth part formed on the inner side wall of the middle through hole is engaged with the outer tooth on the inner hub (141), the inner hub (141) is sleeved in the middle through hole of the spacer (142), and the spline protrusion formed on the outer side of the spacer (142) is sleeved in and matched with the spline groove on the outer hub (171).

7. An electrically all-wheel drive rear-steer axle structure according to claim 6, characterized in that: The rear end of the inner hub (141) is sleeved with the pressure plate (144), the spline protrusion formed on the outer side of the pressure plate (144) is sleeved in and matched with the spline groove on the outer hub (171), and all the spacers (142) and friction plates (143) are in front of the pressure plate (144); The inner side wall of the rear end of the outer hub (171) is formed with an annular clamping groove, the clamping ring is clamped in the annular clamping groove, and the front end face of the clamping ring is pressed against the rear end face of the pressure plate (144).

8. An electrically all-wheel drive rear-steer axle structure according to claim 7, characterized in that: The edge part of the front end plate of the outer hub (171) is formed with a plurality of pressing through holes (172), the pressing pin (173) is sleeved in the pressing through hole (172), the outer side wall of the pressing pin (173) is tightly attached to the inner side wall of the pressing through hole (172), the rear end face of the pressing pin (173) is pressed against the front end face of the frontmost spacer (142), all the friction plates (143) and spacers (142) are pressed against each other, the rear end face of the rearmost friction plate (143) is pressed against the front end face of the pressure plate (144), the middle part of the front end face of the pressing pin (173) is formed with a protruding part which is clamped in the corresponding clamping hole formed on the rear end face of the spring seat (16), and the front end face of the pressing pin (173) is pressed against the rear end face of the spring seat (16).

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