Zero-steering drive axle and garden vehicle

Abstract

The zero-steering drive axle comprises a power unit, a transmission unit and a drive axle housing, and the power unit is provided with an output shaft and a rotation axis; the transmission unit is provided with a central axis; the rotating axis of the power unit coincides with the central axis of the transmission unit. The whole driving axle housing is in a spindle shape and is hollow, the power unit and the transmission unit are matched to form independent driving modules, the driving modules are symmetrically distributed at the two ends of the interior of the driving axle housing, and the transmission unit in the driving modules is driven by the power unit. Zero steering is achieved through cooperative use of advancing and retreating of the driving module.

Description

Technical Field

[0001] The utility model relates to the field of garden vehicles, in particular to a zero-steering drive axle and a garden vehicle. Background Art

[0002] As the country pays more and more attention to environmental pollution, garden vehicles driven by electric motors have become an inevitable trend in the development of garden vehicles in my country due to their advantages of low environmental pollution, low noise, high efficiency, simple structure, easy use and maintenance, and durability. The transmission device of garden vehicles is a key technology of garden vehicles. At present, many garden vehicles use electric drive axles that use motor speed regulation to control the transmission device. The motor is directly installed on the drive axle, and the controller controls the voltage or current of the motor to complete the control of the driving torque and rotation direction of the motor. The drive axle of this structure generally integrates the functional modules of the reducer and differential in the bridge housing to enhance the load-bearing capacity and realize the differential between the wheels, making it difficult to make the weight and volume of the entire drive axle relatively light and small, and the structure is also relatively complex.

[0003] There are two types of riding lawn mowers in the prior art. One type is a gasoline-driven engine. This type of lawn mower generates a lot of noise when running and vibrates a lot when in use, so the user's comfort is poor. However, because of its good endurance, it only needs to prepare enough gasoline for unlimited endurance. The other type is a lithium-ion battery-driven motor. Because it uses a brushless motor, the overall noise is low and the vibration is small, so the user's comfort is high. However, because the lithium battery capacity is limited, the overall endurance is poor. In addition, because electric garden vehicles are different from electric cars, the turning radius requirements in the working scene of garden vehicles are extremely strict, otherwise the garden vehicle will have to pay a lot of repetitive tracks to complete the entire working environment. Utility Model Content

[0004] The purpose of the utility model is to solve the above-mentioned needs and provide a zero-steering drive axle, whose bridge body is isolated from external impurities, thereby protecting internal parts, increasing service life, maintaining the operating stability of the entire drive axle, and ensuring the safety of the operator.

[0005] The advantage of the utility model is that it provides a zero-turn drive axle comprising: a power unit, the power unit having an output shaft and a rotation axis; a transmission unit, the transmission unit having a central axis; the rotation axis of the power unit coincides with the central axis of the transmission unit; a drive axle housing, the drive axle housing being spindle-shaped as a whole and hollow inside, the power unit and the transmission unit being matched as independent travel modules, the travel modules being symmetrically distributed at both ends inside the drive axle housing, the transmission unit in the travel module being driven by the power unit, and zero turn is achieved through the coordinated use of the forward and backward movements of the travel module.

[0006] The utility model has the advantage of providing a zero-steering drive axle, wherein the transmission unit comprises a primary reduction module and a secondary reduction module, which are coaxially arranged, and the volume of the planetary reduction gearbox is greatly reduced compared with conventional products, the torque is large, and the transmission system is flexible and reliable. The simple coaxial structure of the planetary drive axle is also more convenient to install and maintain.

[0007] The advantage of the utility model is that it provides a zero-steering drive axle, wherein the drive axle housing comprises a central drive axle housing and two end drive axle housings connected to the central drive axle housing on the left and right sides, the power unit is located in the central drive axle housing, the transmission unit is located in the end drive axle housings, and the components located inside the drive axle housing are separated from the outside world and isolated from external impurities, thereby protecting the internal parts, increasing the service life, reducing the weight, maintaining the operating stability of the entire drive axle, and ensuring the safety of the operator.

[0008] The advantage of the utility model is that it provides a zero-steering drive axle, wherein the travel modules are symmetrically distributed at both ends of the drive axle housing, and the power unit is also located inside the drive axle housing, so that it cannot be directly observed by the outside world, achieving a hidden effect and further protecting the privacy of the technical solution.

[0009] The advantage of the utility model is that it provides a zero-steering drive axle, which adopts a planetary gear coaxially arranged with the output shaft of the power unit, occupies a very small space, reserves space for subsequent upgrades, and maintains a clean environment for internal parts. Compared with multiple intermediate gear shafts, this solution has a more compact structure and the parts are more concentrated.

[0010] According to one aspect of the utility model, the utility model further provides a zero-turn drive axle, comprising: a power unit, a transmission unit, and a drive axle housing, wherein the power unit has an output shaft and a rotation axis; the transmission unit has a central axis; the rotation axis of the power unit coincides with the central axis of the transmission unit; the drive axle housing as a whole is spindle-shaped and hollow inside, the power unit and the transmission unit are matched as independent traveling modules, the traveling modules are symmetrically distributed at both ends inside the drive axle housing, the transmission unit in the traveling module is driven by the power unit, and zero turn is achieved by the coordinated use of the forward and backward movements of the traveling module.

[0011] According to another aspect of the utility model, the utility model further provides a zero-steering drive axle, wherein the transmission unit includes a primary reduction module and a secondary reduction module, wherein the primary reduction module and the secondary reduction module are both planetary gear transmission devices, and after the power of the power unit is transmitted from the output shaft, it passes through the primary reduction module and the secondary reduction module in sequence, and finally reaches the wheel axle.

[0012] According to another aspect of the utility model, the utility model further provides a zero-steering drive axle, wherein the first-stage reduction module includes: a first inner ring gear; a first planetary gear; a second planetary gear; a third planetary gear; a first sun gear; a first planet carrier; the first planetary gear, the second planetary gear, and the third planetary gear are equidistantly connected to the first planet carrier, and are meshed between the first inner ring gear and the first sun gear through their respective gear parts.

[0013] According to another aspect of the utility model, the utility model further provides a zero-steering drive axle, the secondary reduction module includes a second inner ring gear; a fourth planetary gear; a fifth planetary gear; a sixth planetary gear; a second sun gear; a second planet carrier; the fourth planetary gear; the fifth planetary gear, the sixth planetary gear is equidistantly connected to the second planet carrier, and is meshed between the second inner ring gear and the second sun gear through their respective gear parts.

[0014] According to another aspect of the utility model, the utility model further provides a zero-steering drive axle, wherein the first planet carrier is an annular disc structure.

[0015] According to another aspect of the utility model, the utility model further provides a zero-steering drive axle, wherein the power unit includes a permanent magnet brushless motor.

[0016] According to another aspect of the utility model, the utility model further provides a zero-steering drive axle, wherein the drive axle housing includes a central drive axle housing and two end drive axle housings connected to the left and right sides thereof, the power unit is located in the central drive axle housing, the transmission unit is located in the end drive axle housings, and the components located inside the drive axle housings are separated from the outside.

[0017] According to another aspect of the utility model, the utility model further provides a zero-steering drive axle, wherein the first planet carrier is an annular disc structure. A power transmission part is formed at the plane center of the planet carrier, and the power transmission part is connected to the power input end of the second reduction module. The drive axle housing includes a central drive axle housing and two end drive axle housings connected to the left and right thereof. The power unit is located in the central drive axle housing, and the transmission unit is located in the end drive axle housing. The power unit includes a permanent magnet brushless motor module, an electromagnetic brake module, a manual brake module, an encoder module, and a magnetic module. The end of the permanent magnet brushless motor module away from the output shaft is connected to the electromagnetic brake module, the encoder is connected to the outside of the electromagnetic brake module, the magnetic module is glued to the end of the output shaft, and has a gap with the encoder module, and the manual brake module is sleeved on the outer periphery of the electromagnetic brake module.

[0018] According to another aspect of the utility model, the utility model further provides a zero-steering drive axle, and the number of planetary gears of the primary reduction module and the secondary reduction module can be set to 2, 4, or 5 according to the transmission torque and the transmission ratio, and a third-stage reduction module and a fourth-stage reduction module can be set after the secondary reduction module.

[0019] According to another aspect of the utility model, the utility model further provides a garden vehicle, including an operating system, a working system, and a driving system, wherein the driving system includes the zero-steering drive axle as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is an overall schematic diagram of a zero-steering drive axle according to the first preferred embodiment of the utility model.

[0021] Figure 2 It is a three-dimensional schematic diagram according to the first preferred embodiment of the utility model

[0022] Figure 3 Schematic diagram of a first-stage deceleration module according to the first preferred embodiment of the utility model

[0023] Figure 4 Schematic diagram of a planet carrier according to the first preferred embodiment of the utility model

[0024] Figure 5It is a schematic diagram of a two-stage deceleration module according to the first preferred embodiment of the utility model

[0025] Figure 6 It is a partial schematic diagram of the drive axle housing according to the first preferred embodiment of the utility model

[0026] Figure 7 It is a partial schematic diagram of the drive axle housing according to the first preferred embodiment of the utility model

[0027] Figure 8 It is a cross-sectional structural diagram of the motor unit according to the first preferred embodiment of the utility model

[0028] Fig. 9 The invention is a garden vehicle equipped with the zero-steering drive axle according to the first preferred embodiment of the utility model. DETAILED DESCRIPTION

[0029] Embodiments of the present application are described in detail below, and examples of the embodiments of the present application are shown in the accompanying drawings. In the accompanying drawings, the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0030] Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by persons having ordinary skills in the technical field to which this application belongs. In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to this application.

[0031] In the present utility model, the zero-steering drive axle may also be referred to as a drive axle for short, which has the same meaning.

[0032] Figure 1 The invention is a zero-steering drive axle (X) according to the first preferred embodiment of the utility model, which is generally arranged at the bottom of the vehicle body, with two ends connected and driving the wheels to travel. The drive axle housing (30) covers the main body of the zero-steering drive axle (X).

[0033] Figure 2The invention is a three-dimensional schematic diagram of a first preferred embodiment of the utility model. A zero-steering drive axle comprises: a power unit (10), a transmission unit (20), and a drive axle housing (30), wherein the power unit (10) has an output shaft (101) and a rotation axis (102); the transmission unit (20) has a central axis (202); the rotation axis (102) of the power unit (20) coincides with the central axis (202) of the transmission unit (20); the drive axle housing (30) is spindle-shaped as a whole and hollow inside, the power unit (10) and the transmission unit (20) are matched to form an independent travel module (40), the travel module (40) is symmetrically distributed at both ends inside the drive axle housing (30), the transmission unit (20) in the travel module (40) is driven by the power unit (20), and zero steering is achieved by the forward and backward coordinated use of the travel module (40).

[0034] The transmission unit (20) includes a primary reduction module (21) and a secondary reduction module (22), and the primary reduction module (21) and the secondary reduction module (22) are both planetary gear transmission devices. After the power of the power unit (10) is transmitted from the output shaft (101), it passes through the primary reduction module (21) and the secondary reduction module (22) in sequence, and finally reaches the wheel shaft (50). The power unit (10) is connected to an external power supply end, and the power unit (10) rotates continuously and transmits the rotational force to the primary reduction module (21) through the output shaft (101). After the primary reduction module (21) reduces the rotation speed, it further transmits the power to the secondary reduction module (22), and the secondary reduction module (22) finally transmits the power to the wheel shaft.

[0035] It is worth mentioning that the illustrated part of this embodiment only shows a primary deceleration module (21) and a secondary deceleration module (22). When the vehicle body has a low requirement for deceleration, the transmission unit (20) may also include only a primary deceleration module; similarly, when the vehicle body has a high requirement for a deceleration range, the transmission unit (30) may also include multiple deceleration modules.

[0036] Figure 3It is a schematic diagram of a first-stage reduction module according to the first preferred embodiment of the utility model. The first-stage reduction module (21) includes: a first inner gear ring (210); a first planetary gear (211); a second planetary gear (212); a third planetary gear (213); a first sun gear (215); and a first planet carrier (214). The first planetary gear (211), the second planetary gear (212), and the third planetary gear (213) are equidistantly connected to the first planet carrier (214), and are meshed between the first inner gear ring (210) and the first sun gear (215) through their respective gear parts. Figure 4 As shown, the first planet carrier (214) and the second planet carrier (224) have the same structure, so the illustration of the second planet carrier (224) is omitted here.

[0037] Figure 5 The schematic diagram of the two-stage reduction module according to the first preferred embodiment of the utility model. The two-stage reduction module (22) includes a second inner gear ring (220); a fourth planetary gear (221); a fifth planetary gear (222); a sixth planetary gear (223); a second sun gear (225); and a second planet carrier (224). The fourth planetary gear (221), the fifth planetary gear (222), and the sixth planetary gear (223) are equidistantly connected to the second planet carrier (224), and are meshed between the second inner gear ring (220) and the second sun gear (225) through their respective gear parts.

[0038] The number of planetary gears of the primary reduction module (21) and the secondary reduction module (22) can be set to 2, 4, or 5 according to the transmission torque and the transmission ratio, and a third-stage reduction module or a fourth-stage reduction module can be set after the secondary reduction module (22).

[0039] The first planet carrier (214) is an annular disc structure. The power unit (10) comprises a permanent magnet brushless motor (11).

[0040] Figure 6 and Figure 7 The present invention is a partial schematic diagram of a drive axle housing according to a first preferred embodiment of the utility model. The drive axle housing (30) comprises a central drive axle housing (31) and two end drive axle housings (32) connected to the central drive axle housing (31), the power unit (10) is located in the central drive axle housing (31), the transmission unit (20) is located in the end drive axle housing (32), and the components located inside the drive axle housing (30) are separated from the outside.

[0041] Figure 8The utility model is a cross-sectional structural diagram of a motor unit according to a first preferred embodiment. The power unit (10) comprises a permanent magnet brushless motor module (11), an electromagnetic brake module (12), a manual brake module (13), an encoder module (14), and a magnetic module (15). The end of the permanent magnet brushless motor module (11) facing away from the output shaft (101) is connected to the electromagnetic brake module (12). The encoder is connected to the outside of the electromagnetic brake module (12). The magnetic module (15) is glued to the end of the output shaft (101) and has a gap with the encoder module (14). The manual brake module (13) is sleeved on the outer periphery of the electromagnetic brake module (12).

[0042] The number of planetary gears of the primary reduction module (21) and the secondary reduction module (22) can be set to 2, 4, or 5 according to the transmission torque and the transmission ratio, and a third-stage reduction module or a fourth-stage reduction module can be set after the secondary reduction module (22).

[0043] Fig. 9 The invention relates to a garden vehicle equipped with the zero-steering drive axle according to the first preferred embodiment of the utility model. The garden vehicle comprises an operating system (1), a working system (2), and a driving system (3), wherein the driving system (3) comprises the above-mentioned zero-steering drive axle (X).

Claims

1. A zero-turn drive axle, characterized in that: include: A power unit (10) having an output shaft (101) and a rotation axis (102); A transmission unit (20) having a central axis (202); The rotation axis (102) of the power unit (10) coincides with the central axis (202) of the transmission unit (20); A drive axle housing (30), wherein the drive axle housing (30) is spindle-shaped as a whole and hollow inside, wherein the power unit (10) and the transmission unit (20) are matched to form an independent travel module (40), wherein the travel module (40) is symmetrically distributed at two ends inside the drive axle housing (30), and the transmission unit (20) in the travel module (40) is driven by the power unit (10), and zero turning is achieved through the coordinated use of the forward and backward movement of the travel module (40).

2. The zero-turn drive axle according to claim 1, characterized in that: The transmission unit (20) comprises a primary reduction module (21) and a secondary reduction module (22), wherein the primary reduction module (21) and the secondary reduction module (22) are both planetary gear transmission devices, and after the power of the power unit (10) is transmitted from the output shaft (101), it passes through the primary reduction module (21) and the secondary reduction module (22) in sequence and finally reaches the wheel shaft (50).

3. The zero-turn drive axle as claimed in claim 2, characterized in that: The primary deceleration module (21) comprises: A first inner gear ring (210); A first planetary gear (211); A second planetary gear (212); A third planetary gear (213); A first sun gear (215); A first planet carrier (214); The first planetary gear (211), the second planetary gear (212), and the third planetary gear (213) are equidistantly connected to the first planet carrier (214), and are meshed between the first inner gear ring (210) and the first sun gear (215) through their respective gear parts.

4. The zero-turn drive axle as claimed in claim 3, characterized in that: The secondary deceleration module (22) comprises: A second inner gear ring (220); A fourth planetary gear (221); A fifth planetary gear (222); Sixth planetary gear (223); A second sun gear (225); A second planet carrier (224); The fourth planetary gear (221), the fifth planetary gear (222), and the sixth planetary gear (223) are equidistantly connected to the second planet carrier (224), and are meshed between the second internal gear ring (220) and the second sun gear (225) through their respective gear parts.

5. The zero-turn drive axle as claimed in claim 3, characterized in that: The first planet carrier (214) is an annular disc structure.

6. The zero-turn drive axle according to claim 1, characterized in that: The power unit (10) comprises a permanent magnet brushless motor module (11).

7. The zero-turn drive axle according to claim 1, characterized in that: The drive axle housing (30) comprises a central drive axle housing (31) and end drive axle housings (32) connected to the central drive axle housing (31) and the end drive axle housings (32) connected to the central drive axle housing (31). The power unit (10) is located in the central drive axle housing (31), the transmission unit (20) is located in the end drive axle housing (32), and each element inside the drive axle housing (30) is separated from the outside.

8. The zero-turn drive axle as claimed in claim 4, characterized in that: The first planet carrier (214) is an annular disc structure. The drive axle housing (30) comprises a central drive axle housing (31) and end drive axle housings (32) connected to the central drive axle housing (31) and the transmission unit (20) is located in the end drive axle housing (32). The power unit (10) comprises a permanent magnet brushless motor module (11), an electromagnetic brake module (12), a manual brake module (13), an encoder module (14), and a magnetic module (15). The end of the permanent magnet brushless motor module (11) facing away from the output shaft (101) is connected to the electromagnetic brake module (12). The encoder module (14) is connected to the outside of the electromagnetic brake module (12). The magnetic module (15) is glued to the end of the output shaft (101) and has a gap with the encoder module (14). The manual brake module (13) is sleeved on the outer periphery of the electromagnetic brake module (12).

9. The zero-turn drive axle according to claim 3 or 4, characterized in that: The number of planetary gears of the primary reduction module (21) and the secondary reduction module (22) can be set to 2, 4, or 5 according to the transmission torque and the transmission ratio, and a third-stage reduction module or a fourth-stage reduction module can be set after the secondary reduction module (22).

10. A garden vehicle, characterized in that: It comprises an operating system (1), a working system (2), and a driving system (3), wherein the driving system (3) comprises a zero-steering drive axle as claimed in any one of claims 1 to 8.

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