Wet-type electric bridge adopting key positioning

Abstract

The utility model discloses a wet-type electric axle adopting key positioning, which comprises a brake shell fixed on one side of a motor and a hub assembly fixed on the outer side of the brake shell, an output shaft is arranged in the brake shell, the output shaft is movably connected to the middle part of a parking brake shell through a bearing, and the hub assembly is connected with the brake shell through a bearing. The outer end of the output shaft extends into a shell of the hub assembly, a sun wheel shaft is arranged in the middle of the shell of the hub assembly, a driven gear is inserted into the inner end of the sun wheel shaft in a sleeved mode, the driven gear and the sun wheel shaft are connected, positioned and fixed through a flat key, and the outer side wall of the sleeve body portion of the driven gear is movably connected into the parking brake shell through a bearing. The driven gear and the sun gear shaft are connected through the flat keys, meanwhile, the planetary gear ring and the shell are connected through the first flat keys, the centering effect is improved, and operation is more stable.

Description

Technical field:

[0001] The utility model relates to the technical field related to drive axles, and more specifically to a wet electric axle using key positioning. Background technology:

[0002] With the development of the domestic forklift industry, the design and manufacture of wet drive axles have gradually matured. As one of the main drive systems of forklifts, drive axles are used in various types of forklifts. Due to the development of electric vehicles, a large number of existing forklifts also use electric forklifts, and their drive axles are also driven by motors. Therefore, the existing electric drive axles are constantly being created and updated.

[0003] For example, an electric drive axle assembly with Chinese patent application number 202311404674.3 includes a motor, a bridge housing, a differential and a hub unit assembly; wherein a hub unit is installed at the bridge housing, a sun gear shaft is provided inside the hub unit, and a driven gear is installed on the sun gear shaft, while the existing sun gear shaft and the driven gear are connected by splines, which is troublesome to manufacture and has limited coaxial centering effect, so that the coaxiality of the driven gear and the sun gear shaft is average;

[0004] Similarly, an internal gear ring is installed inside the existing hub unit, and the planetary gear is meshed with the internal gear ring. The existing internal gear ring and the inner wall surface of the hub unit are spline-connected and fixed by bolts, which is troublesome to install and the centering accuracy of the spline connection is not high. Utility model content:

[0005] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a wet electric bridge using key positioning, which uses a flat key to achieve the connection between the driven gear and the sun gear shaft, and transmits power through the contact between the side of the flat key and the keyway and the side of the axial connecting groove, so that the sun gear shaft directly drives the driven gear to run when it is running, and the centering accuracy of the flat key is higher than that of the spline, so that the coaxiality effect of the driven gear and the sun gear shaft is greatly improved, ensuring that the hub assembly runs more smoothly, and at the same time, a plurality of first flat keys are also used to connect the planetary ring gear and the housing, so as to improve its centering effect and make its operation more stable, and the first flat key is limited by the first retaining spring, and there is no need to use bolts and other structures, so that its installation and disassembly are more convenient.

[0006] The solution of the utility model to solve the technical problem is:

[0007] A key-positioned wet electric bridge comprises a brake housing fixed to one side of a motor and a wheel hub assembly fixed to the outside of the brake housing, wherein the brake housing comprises a service brake housing and a parking brake housing, wherein the inner end of the service brake housing is fixed to a corresponding end face of the motor, the parking brake housing is fixed to the outer end of the service brake housing, and the inner end of the housing of the wheel hub assembly is fixed to the outer end of the parking brake housing;

[0008] An output shaft is provided in the brake housing, and the output shaft is movably connected to the middle part of the parking brake housing through a bearing, the outer end part of the output shaft extends into the housing of the wheel hub assembly, and an outer tooth portion is formed on the outer side wall of the outer end part of the output shaft. A sun gear shaft is provided in the middle part of the housing of the wheel hub assembly, and a center through hole is formed in the middle part of the outer end surface of the housing of the wheel hub assembly, and the center through hole extends into the housing, and a driven gear is inserted into the inner end of the sun gear shaft, and the driven gear and the sun gear shaft are connected and positioned and fixed by a flat key, and the outer side wall of the sleeve part of the driven gear is movably connected in the parking brake housing through a bearing.

[0009] The outer end of the sun gear shaft is formed with a first extension shaft portion, which is inserted into a mounting hole in the middle of the inner end of the rotating shaft portion at the inner end of the hub connecting portion and movably connected to the rotating shaft portion at the inner end of the hub connecting portion through a bearing.

[0010] A keyway is formed on one side wall of the inner end of the sun gear shaft, an axial connection groove is formed on the inner side wall of the sleeve body of the driven gear, and the flat key is located in the keyway and the axial connection groove;

[0011] A retaining spring groove is formed on the outer side wall of the sun gear shaft at the outer end and rear end of the driven gear, and the retaining spring is clamped in the corresponding retaining spring groove, and the outer end and rear end of the driven gear are located between the two retaining springs.

[0012] A stepped hole extending inward is formed at the upper outer end surface of the parking brake housing, the inner diameter of the outer end hole section of the stepped hole is larger than that of the inner end hole section, the inner end of the sun gear shaft is inserted into the stepped hole, the outer ring of the corresponding bearing is clamped on the inner side wall of the outer end hole section, the inner end surface of the outer ring of the corresponding bearing is pressed against the inner end surface of the outer end hole section, the inner ring of the corresponding bearing is clamped on the outer side wall of the sleeve body of the driven gear, a radial extension portion is formed at the outer end of the outer side wall of the sleeve body, the inner end surface of the radial extension portion is pressed against the outer end surface of the inner ring of the corresponding bearing, a first retaining spring is nested in the retaining spring groove on the outer side wall at the inner end of the sleeve body, and the inner end surface of the inner ring of the corresponding bearing is close to or close to the first retaining spring;

[0013] An external spline is formed on the outer side of the rotating shaft portion at the inner end of the hub connecting portion, the planet carrier is in the shell of the hub assembly, the sleeve body portion formed at the outer end of the planet carrier is inserted into the central through hole of the shell, the outer wall of the sleeve body portion is movably connected to the inner wall of the central through hole of the shell through a bearing, a spline groove is formed on the inner wall of the sleeve body portion, and the external spline is inserted into the spline groove. The two cooperate with each other, and a planet shaft is formed on the radially extending edge formed on the outer wall of the inner end of the planet carrier, and a planetary gear is movably connected to the planetary gear through a bearing, and the outer tooth portion of the planetary gear is meshed with the outer tooth portion formed on the outer wall of the sun gear shaft;

[0014] An annular groove is formed on the inner side wall of the shell facing the planetary gear, the inner end of the annular groove is communicated with the mounting opening in the middle of the inner end surface of the shell, the planetary gear ring is inserted into the annular groove, the outer side wall of the planetary gear ring is tightly attached to the inner side wall of the annular groove, the outer end surface of the planetary gear ring is pressed against the outer end surface of the annular groove, the planetary gear ring is connected to the shell through a plurality of first flat keys, and the outer tooth portion of the planetary gear is meshed with the inner tooth portion of the planetary gear ring.

[0015] The outstanding effects of the utility model are:

[0016] 1. It uses a flat key to connect the driven gear to the sun gear shaft. The side of the flat key contacts the keyway and the side of the axial connection groove to transmit power, so that the sun gear shaft directly drives the driven gear to run when it runs. There is basically no collision between the two, and the operation is stable.

[0017] 2. The centering accuracy of the flat key is higher than that of the spline, which greatly improves the coaxiality of the driven gear and the sun gear shaft, ensuring that the hub assembly runs more smoothly.

[0018] 3. Its flat key and driven gear are positioned and installed with two retaining springs, making it stable to install and easy to disassemble and assemble.

[0019] 4. Its planetary gear ring and housing are connected by multiple first flat keys to improve its centering effect and make its operation more stable. In addition, the first flat key is limited by the first retaining spring, and there is no need to use bolts and other structures, making its installation and disassembly more convenient. Description of the drawings:

[0020] Figure 1 It is a partial structural schematic diagram of the utility model on a single motor;

[0021] Figure 2 It is a schematic diagram of the partial structure of the utility model in the dual motor;

[0022] Figure 3 yes Figure 1 A partial enlarged view of

[0023] Figure 4It is a partial cross-sectional view between the planetary gear ring and the first flat key. Specific implementation method:

[0024] For example, see Figures 1 to 4 As shown, a key-positioned wet electric bridge comprises a brake housing 20 fixed to one side of a motor 10 and a wheel hub assembly 30 fixed to the outside of the brake housing 20, wherein the brake housing 20 comprises a service brake housing 21 and a parking brake housing 22, wherein the inner end of the service brake housing 21 is fixed to a corresponding end face of the motor 10 by bolts, the parking brake housing 22 is fixed to the outer end of the service brake housing 21 by bolts, and the inner end of the housing of the wheel hub assembly 30 is fixed to the outer end of the parking brake housing 22 by bolts;

[0025] An output shaft 40 is provided in the brake housing 20, and the output shaft 40 is movably connected to the middle part of the parking brake housing 22 through a bearing, the outer end of the output shaft 40 extends into the housing of the hub assembly 30, and an outer tooth portion is formed on the outer side wall of the outer end of the output shaft 40, and a sun gear shaft 31 is provided in the middle part of the housing of the hub assembly 30, and a central through hole is formed in the middle part of the outer end surface of the housing of the hub assembly 30, and the central through hole extends into the housing, and the hub connecting part 50 is at the outer end of the housing, and the rotating shaft part of the inner end of the hub connecting part 50 is inserted into the central through hole of the housing and movably connected to the housing through a bearing, the outer end of the sun gear shaft 31 is movably connected to the rotating shaft part of the inner end of the hub connecting part 50 through a bearing, and the inner end of the sun gear shaft 31 is inserted with a driven gear 32, and the driven gear 32 and the sun gear shaft 31 are connected and positioned and fixed by a flat key, and the outer side wall of the sleeve part of the driven gear 32 is movably connected in the parking brake housing 22 through a bearing. The driven gear 32 meshes with the external tooth portion formed on the outer side wall of the outer end portion of the output shaft 40. A connecting shaft portion is formed in the middle portion of the outer end portion of the output shaft 40. The connecting shaft portion is located in a socket in the outer end surface of the inner cavity of the shell of the hub assembly 30 and is movably connected through a bearing.

[0026] Furthermore, the outer end of the sun gear shaft 31 is formed with a first extension shaft portion 311, which is inserted into the mounting hole in the middle of the inner end of the rotating shaft portion of the inner end of the hub connecting portion 50 and is movably connected to the rotating shaft portion of the inner end of the hub connecting portion 50 through a bearing.

[0027] Furthermore, a keyway is formed on one side wall of the inner end of the sun gear shaft 31, an axial connecting groove is formed on the inner side wall of the sleeve body of the driven gear 32, and the flat key 1 is located in the keyway and the axial connecting groove; both side walls of the flat key 1 are tightly attached to or clamped with the inner side walls of the keyway and the axial connecting groove.

[0028] A retaining spring groove is formed on the outer wall of the sun gear shaft 31 at the outer end and rear end of the driven gear 32 , and the retaining spring 2 is clamped in the corresponding retaining spring groove, and the outer end and rear end of the driven gear 32 are located between the two retaining springs 2 .

[0029] Furthermore, a stepped hole 23 extending inward is formed at the upper outer end surface of the parking brake housing 22, the inner diameter of the outer end hole section of the stepped hole 23 is larger than the inner end hole section, the inner end of the sun gear shaft 31 is inserted into the stepped hole 23, the outer ring of the corresponding bearing is clamped on the inner side wall of the outer end hole section, the inner end surface of the outer ring of the corresponding bearing is pressed against the inner end surface of the outer end hole section, the inner ring of the corresponding bearing is clamped on the outer side wall of the sleeve body of the driven gear 32, a radial extension portion 321 is formed at the outer end of the outer side wall of the sleeve body, the inner end surface of the radial extension portion 321 is pressed against the outer end surface of the inner ring of the corresponding bearing, a first retaining spring is embedded in the retaining spring groove on the outer side wall at the inner end of the sleeve body, and the inner end surface of the inner ring of the corresponding bearing is close to or close to the first retaining spring;

[0030] An annular cover 24 is fixedly connected to the upper outer end surface of the parking brake housing 22 by bolts, and the inner end surface of the annular cover 24 is pressed against the outer end surface of the outer ring of the corresponding bearing.

[0031] Furthermore, a notch is formed on the outer side of the inner end of the flat key 1, and a groove body formed on the inner wall of the notch corresponds to the retaining spring groove on the outer wall of the sun gear shaft 31 at the inner end of the driven gear 32, and the corresponding retaining spring 2 is clamped in this groove body and the retaining spring groove.

[0032] like Figure 1 As shown, this embodiment is installed in a single-motor state, and a differential is installed in the service brake housing 21 on the right side of the motor. The motor transmits power to the differential, and the two drive shafts of the differential transmit power to the two output shafts 40. This is a conventional connection method and will not be described in detail here.

[0033] like Figure 2 As shown, this embodiment is installed in a dual-motor state, and the output shafts of the two motors are individually connected to the corresponding output shafts 40 to achieve power transmission.

[0034] In this embodiment, a flat key 1 is provided between the driven gear 32 and the sun gear shaft 31, so that the coaxiality is better and the operation is more stable. At the same time, two retaining springs 2 are used to limit the position between the driven gear 32 and the sun gear shaft 31, so as to ensure a firm connection and facilitate loading and unloading.

[0035] The brake housing 20 includes a service brake housing 21 and a parking brake housing 22, which are fixed by bolts, so that the two are easy to disassemble, thereby making it easier to repair, maintain, install, disassemble and replace the internal parts, and the difficulty is greatly reduced.

[0036] Further, an external spline is formed on the outer side of the rotating shaft portion at the inner end of the hub connecting portion 50, the planet carrier 60 is in the shell of the hub assembly 30, the sleeve body portion 61 formed on the outer end of the planet carrier 60 is inserted into the central through hole of the shell, the outer side wall of the sleeve body portion 61 is movably connected to the inner side wall of the central through hole of the shell through a bearing, a spline groove is formed on the inner side wall of the sleeve body portion 61, and the external spline is inserted into the spline groove, and the two cooperate with each other, and a planet shaft is formed on the radially extending edge formed on the outer side wall of the inner end of the planet carrier 60, and a planetary gear 62 is movably connected to the planetary shaft through a bearing, and the outer tooth portion of the planetary gear 62 is meshed with the outer tooth portion formed on the outer side wall of the sun gear shaft 31;

[0037] An annular groove is formed on the inner wall of the shell facing the planetary gear 62, and the inner end of the annular groove is communicated with the mounting port in the middle of the inner end surface of the shell. The planetary ring gear 70 is inserted into the annular groove, and the outer wall of the planetary ring gear 70 is tightly attached to the inner wall of the annular groove. The outer end surface of the planetary ring gear 70 is pressed against the outer end surface of the annular groove. The planetary ring gear 70 is connected to the shell through a plurality of first flat keys 72, and the outer tooth portion of the planetary gear 62 is meshed with the inner tooth portion of the planetary ring gear 70.

[0038] The outer wall of the planetary gear ring 70 is formed with a plurality of external mounting grooves, and all the external mounting grooves are evenly distributed on the outer wall of the planetary gear ring 70 with the central axis of the planetary gear ring 70 as the center;

[0039] An inner mounting groove is formed on the inner side wall of the annular groove corresponding to the outer mounting groove, and the inner end of the inner mounting groove is connected to the mounting port in the middle of the inner end surface of the shell. The first flat key 72 is clamped in the corresponding outer mounting groove and inner mounting groove, and the front and rear side walls of the first flat key 72 are tightly attached to the inner side walls of the corresponding outer mounting groove and inner mounting groove to achieve clamping and fixing.

[0040] An annular groove is formed on the inner side wall at the inner end of the annular groove, and the first clamping spring 73 is clamped in the annular groove. The inner end faces of all the first flat keys 72 are close to or in close contact with the outer end face of the first clamping spring 73 .

[0041] The planetary gear ring 70 is connected to the housing by a plurality of first flat key connections 72, which improves the centering effect and makes the operation more stable. The first flat key 72 is limited by the first retaining spring 73, and there is no need to use bolts or other structures, making the installation and disassembly more convenient.

Claims

1. A wet electric axle using key positioning, comprising a brake housing (20) fixed to one side of a motor (10) and a hub assembly (30) fixed to the outside of the brake housing (20), characterized in that: The brake housing (20) comprises a service brake housing (21) and a parking brake housing (22), wherein the inner end of the service brake housing (21) is fixed to a corresponding end face of the motor (10), the parking brake housing (22) is fixed to the outer end of the service brake housing (21), and the inner end of the housing of the wheel hub assembly (30) is fixed to the outer end of the parking brake housing (22); An output shaft (40) is provided in the brake housing (20), and the output shaft (40) is movably connected to the middle part of the parking brake housing (22) through a bearing, and the outer end of the output shaft (40) extends into the housing of the hub assembly (30), and an outer tooth portion is formed on the outer side wall of the outer end of the output shaft (40), and a sun gear shaft (31) is provided in the middle part of the housing of the hub assembly (30), and a central through hole is formed in the middle part of the outer end surface of the housing of the hub assembly (30), and the central through hole extends into the housing, and the hub connecting portion (50) is located in the housing. The outer end of the hub connecting part (50) is inserted into the central through hole of the housing and is movably connected to the housing through a bearing. The outer end of the sun gear shaft (31) is movably connected to the inner end of the hub connecting part (50) through a bearing. The inner end of the sun gear shaft (31) is inserted with a driven gear (32). The driven gear (32) and the sun gear shaft (31) are connected and fixed by a flat key (1). The outer side wall of the sleeve of the driven gear (32) is movably connected to the parking brake housing (22) through a bearing.

2. A wet electric axle using key positioning according to claim 1, characterized in that: The outer end of the sun gear shaft (31) is formed with a first extension shaft portion (311), which is inserted into a mounting hole in the middle of the inner end of the rotating shaft portion at the inner end of the hub connecting portion (50) and is movably connected to the rotating shaft portion at the inner end of the hub connecting portion (50) via a bearing.

3. A wet electric axle using key positioning according to claim 1, characterized in that: A keyway is formed on one side wall of the inner end of the sun gear shaft (31), an axial connection groove is formed on the inner side wall of the sleeve body of the driven gear (32), and the flat key (1) is located in the keyway and the axial connection groove; A retaining spring groove is formed on the outer side wall of the sun gear shaft (31) at the outer end and rear end of the driven gear (32), and the retaining spring (2) is clamped in the corresponding retaining spring groove. The outer end and rear end of the driven gear (32) are located between the two retaining springs (2).

4. A wet electric axle using key positioning according to claim 3, characterized in that: A stepped hole (23) extending inward is formed at the upper outer end surface of the parking brake housing (22); the inner diameter of the outer end hole section of the stepped hole (23) is larger than that of the inner end hole section; the inner end of the sun gear shaft (31) is inserted into the stepped hole (23); the outer ring of the corresponding bearing is clamped on the inner side wall of the outer end hole section; the inner end surface of the outer ring of the corresponding bearing is pressed against the inner end surface of the outer end hole section; the inner ring of the corresponding bearing is clamped on the outer side wall of the sleeve body of the driven gear (32); a radial extension portion (321) is formed at the outer end of the outer side wall of the sleeve body; the inner end surface of the radial extension portion (321) is pressed against the outer end surface of the inner ring of the corresponding bearing; a first retaining spring is embedded in the retaining spring groove on the outer side wall at the inner end of the sleeve body; the inner end surface of the inner ring of the corresponding bearing is close to or in close contact with the first retaining spring; An annular cover (24) is fixedly connected to the upper outer end surface of the parking brake housing (22) by means of bolts, and the inner end surface of the annular cover (24) is pressed against the outer end surface of the outer ring of the corresponding bearing.

5. A wet electric axle using key positioning according to claim 3, characterized in that: A notch is formed on the outer side of the inner end of the flat key (1), and a groove body formed on the inner side wall of the notch corresponds to a retaining spring groove on the outer side wall of the sun gear shaft (31) at the inner end of the driven gear (32), and a corresponding retaining spring (2) is clamped in the groove body and the retaining spring groove.

6. A wet type electric axle using key positioning according to claim 1, characterized in that: An external spline is formed on the outer side of the rotating shaft portion at the inner end of the hub connecting portion (50); the planet carrier (60) is located in the shell of the hub assembly (30); the sleeve portion (61) formed on the outer end of the planet carrier (60) is inserted into the central through hole of the shell; the outer wall of the sleeve portion (61) is movably connected to the inner wall of the central through hole of the shell through a bearing; a spline groove is formed on the inner wall of the sleeve portion (61); the external spline is inserted into the spline groove, and the two cooperate with each other; a planet shaft is formed on the radially extending edge formed on the outer wall of the inner end of the planet carrier (60); a planetary gear (62) is movably connected to the planetary gear via a bearing; the outer tooth portion of the planetary gear (62) meshes with the outer tooth portion formed on the outer wall of the sun gear shaft (31); An annular groove is formed on the inner side wall of the housing facing the planetary gear (62), the inner end of the annular groove is communicated with the mounting opening in the middle of the inner end surface of the housing, the planetary gear ring (70) is inserted into the annular groove, the outer side wall of the planetary gear ring (70) is tightly attached to the inner side wall of the annular groove, the outer end surface of the planetary gear ring (70) is pressed against the outer end surface of the annular groove, the planetary gear ring (70) is connected to the housing via a plurality of first flat keys (72), and the outer tooth portion of the planetary gear (62) is meshed with the inner tooth portion of the planetary gear ring (70).

7. A wet electric axle using key positioning according to claim 6, characterized in that: A plurality of external mounting grooves are formed on the outer side wall of the planetary gear ring (70), and all the external mounting grooves are evenly distributed on the outer side wall of the planetary gear ring (70) with the central axis of the planetary gear ring (70) as the center. An inner mounting groove is formed on the inner side wall of the annular groove corresponding to the outer mounting groove, the inner end of the inner mounting groove communicates with the mounting opening in the middle of the inner end surface of the shell, and the first flat key (72) is clamped in the corresponding outer mounting groove and the inner mounting groove.

8. A wet-type electric axle using key positioning according to claim 7, characterized in that: An annular groove is formed on the inner side wall at the inner end of the annular groove, the first clamping spring (73) is clamped in the annular groove, and the inner end faces of all the first flat keys (72) are close to or in close contact with the outer end face of the first clamping spring (73).

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