CN221958073U - Gearbox and electric engineering machinery - Google Patents

Abstract

The utility model relates to the technical field of engineering machinery, and discloses a gearbox and an electric engineering machinery. The gearbox has three gears, namely, neutral gear, first gear and second gear, which can meet the speed change demand of the electric engineering machinery, avoid a large speed change of a travel motor in a short time, improve the response speed of the output speed of the gearbox, and thus improve the response speed of the travel speed of the electric engineering machinery; and only the direction of rotation of the output end of the travel motor is changed to change the rotation direction of the output shaft of the gearbox to realize the reverse gear function, and the gearbox does not need to be provided with a reverse gear, thus simplifying the structure of the gearbox, making the layout reasonable, and having a high degree of integration, which is conducive to reducing the installation space occupied by the gearbox.

Description

Gearbox and electric engineering machinery

Technical Field

The utility model relates to the technical field of engineering machinery, in particular to a gearbox and an electric engineering machinery.

Background Art

The gearbox of pure electric and hybrid electric automatic transmission vehicles is directly connected to the travel motor. The forward and reverse rotation of the travel motor is used to realize the forward and reverse rotation of the vehicle. The travel motor speed is adjusted to meet different vehicle speed requirements. In order to simplify the gearbox used in pure electric and hybrid electric automatic transmission vehicles, the gear position of the gearbox is cancelled, that is, a single-speed box is used to replace the gearbox.

However, when a single-speed gearbox is used, in order to meet the vehicle speed requirements under different working conditions, the speed regulation range of the travel motor is wider. For example, when the vehicle speed needs to increase or decrease suddenly, it is necessary to control the travel motor to undergo a large speed change in a relatively short period of time, which can easily cause the vehicle speed to respond in an untimely manner.

Therefore, a gearbox is urgently needed to solve the above-mentioned technical problems.

Utility Model Content

The utility model aims to provide a gearbox and an electric engineering machine, which can improve the response speed of the output rotation speed of the gearbox.

To achieve this purpose, the utility model adopts the following technical solutions:

A gearbox, comprising a gearbox body, a first gear ring, a first gear clutch and a planetary transmission unit, wherein the first gear ring can be selectively fixed or rotated relative to the gearbox body through the first gear clutch, and the planetary transmission unit comprises a planet carrier rotatably connected to the gearbox body, and planetary wheels rotatably mounted on the planet carrier, and the planetary wheels are meshed and connected with the first gear ring;

The gearbox further comprises an output transmission gear fixedly connected to the planet carrier, and:

a sun gear shaft, on which a first gear and a second gear are fixed, wherein the first gear is meshingly connected with the planetary gear; and the output transmission gear can be selectively fixed or rotated relative to the second gear through a second gear clutch;

An output shaft is provided with an output gear fixed on the output shaft, and the output gear is meshed with the output transmission gear.

Compared with the prior art, the gearbox provided by the utility model has the following beneficial effects:

The gearbox provided by the utility model has three gears: neutral, first gear and second gear, which can meet the speed change requirements of electric engineering machinery, avoid large speed changes of the travel motor in a short period of time, and improve the response speed of the output speed of the gearbox; the gearbox does not need to be set with a reverse gear, simplifies the structure of the gearbox, has a reasonable layout, high integration, and occupies a small space.

As a preferred technical solution of the above gearbox, a gear chamber is provided on the gearbox body, and the first gear clutch comprises:

a first gear friction pair, the first gear friction pair being meshingly connected with the first gear ring gear;

A first-gear piston, the first-gear piston is restricted from rotating relative to the gearbox body, and the first-gear piston is axially movable in the first-gear chamber to reciprocate between a first-gear locking position axially pressed against the first-gear friction pair and a first-gear unlocking position separated from the first-gear friction pair;

When the first gear piston is in the first gear locking position, the first gear friction pair is fixed relative to the first gear piston; when the first gear piston is in the first gear unlocking position, the first gear friction pair can rotate relative to the first gear piston.

As a preferred technical solution for the above-mentioned gearbox, the gearbox body is provided with a first gear inlet and outlet flow channel connected to the first gear chamber, and the first gear clutch also includes a first gear elastic return member, and the first gear elastic return member can apply an axial force to the first gear piston so that the first gear piston has a movement tendency to move axially from the first gear locking position to the first gear unlocking position.

As a preferred technical solution of the above-mentioned gearbox, the first-gear elastic return member is radially spaced and sleeved outside the first-gear friction pair.

As a preferred technical solution of the above gearbox, the first gear ring gear has internal splines and external splines, the internal splines of the first gear ring gear are meshedly connected with the planetary gears, and the external splines of the first gear ring gear are meshedly connected with the first gear friction pair.

As a preferred technical solution of the above gearbox, the second gear clutch comprises:

A second-gear cylinder body, the second-gear cylinder body is rotatably connected to the sun gear shaft and the gearbox body, the second-gear cylinder body is fixedly connected to the output transmission gear, and a second-gear chamber is provided on the second-gear cylinder body;

A second-gear friction pair, the second-gear friction pair being connected to the second-gear gear;

A second-gear piston, the second-gear piston is restricted from rotating relative to the second-gear cylinder body, the second-gear piston is axially movable in the second-gear chamber, and moves back and forth between a second-gear locking position in axial compression contact with the second-gear friction pair and a second-gear unlocking position separated from the second-gear friction pair;

When the second-gear piston is in the second-gear locking position, the second-gear friction pair is fixed relative to the second-gear piston; when the second-gear piston is in the second-gear unlocking position, the second-gear friction pair can rotate relative to the second-gear piston.

As a preferred technical solution for the above-mentioned gearbox, the second gear cylinder body is provided with a second gear inlet and outlet flow channel connected to the second gear chamber, and the second gear clutch also includes a second gear elastic reset member, and the second gear elastic reset member can apply an axial force to the second gear piston so that the second gear piston has a movement tendency to move axially from the second gear locking position to the second gear unlocking position.

As a preferred technical solution of the above-mentioned gearbox, the second-gear friction pair is radially spaced and sleeved outside the second-gear elastic reset member.

As a preferred technical solution of the above gearbox, it also includes:

An input shaft, on which an input gear is fixed;

An intermediate shaft is fixed with an input transmission gear, the input gear is meshed with the input transmission gear, and the intermediate shaft is fixedly connected to the sun gear shaft.

In order to achieve the above purpose, the utility model also provides an electric engineering machine, including a travel motor and the above gearbox, the output end of the travel motor is drivingly connected to the input shaft of the gearbox, and the electric engineering machine is a loader or a forklift.

Compared with the prior art, the electric engineering machinery provided by the utility model has the following beneficial effects:

The electric engineering machinery provided by the utility model includes the above-mentioned gearbox, which has three gears: neutral, first gear and second gear, which can meet the speed change requirements of the electric engineering machinery, avoid large speed changes of the travel motor in a short period of time, improve the response speed of the output speed of the gearbox, and thus improve the response speed of the travel speed of the electric engineering machinery; and only the direction of rotation of the output end of the travel motor needs to be changed to change the rotation direction of the output shaft of the gearbox to realize the reverse gear function, and the gearbox does not need to be set with a reverse gear, which simplifies the structure of the gearbox, has a reasonable layout, and a high degree of integration, which is conducive to reducing the installation space occupied by the gearbox.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

FIG1 is a cross-sectional view of a gearbox provided by an embodiment of the utility model;

FIG2 is a power transmission diagram when the gearbox is in first gear provided by an embodiment of the utility model;

FIG3 is a power transmission diagram provided by an embodiment of the present utility model when the transmission is in the second gear.

In the figure:

1. Input shaft; 2. Sun gear shaft; 3. Input transmission gear; 4. Planet carrier; 5. Planet shaft; 6. First gear ring gear; 7. First gear friction pair; 8. First gear elastic return member; 9. Middle cover; 10. Output shaft; 11. Output gear; 12. Planet gear; 13. Second gear gear; 14. Second gear elastic return member; 15. Second gear cylinder; 16. First gear gear; 17. Second gear piston; 18. Second gear friction pair; 19. Output transmission gear; 20. Box body; 21. First gear piston; 22. Input gear; 23. Intermediate shaft; 24. Retaining ring; 25. First gear chamber; 26. Second gear chamber; 27. Second gear inlet and outlet passage.

DETAILED DESCRIPTION

The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

As shown in FIG1 , the present embodiment provides a gearbox, including a gearbox body, a first gear ring gear 6, a first gear clutch and a planetary transmission unit, wherein the first gear ring gear 6 can be selectively fixed or rotated relative to the gearbox body through the first gear clutch, and the planetary transmission unit includes a planet carrier 4 rotatably connected to the gearbox body, and a planetary gear 12 rotatably mounted on the planet carrier 4, and the planetary gear 12 is meshedly connected with the first gear ring gear 6; the gearbox also includes an output transmission gear 19 fixedly connected to the planet carrier 4, and a sun gear shaft 2 and an output shaft 10 both rotatably connected to the gearbox body, wherein a first gear gear 16 and a second gear gear 13 are fixed on the sun gear shaft 2, and the first gear gear 16 is meshedly connected with the planetary gear 12; the output transmission gear 19 can be selectively fixed or rotated relative to the second gear gear 13 through the second gear clutch; an output gear 11 is fixedly provided on the output shaft 10, and the output gear 11 is meshed with the output transmission gear 19.

The gearbox provided in this embodiment has the first gear clutch and the second gear clutch both in the disengaged state, and the sun gear shaft 2 rotates to drive the first gear gear 16 to rotate. Since the first gear clutch and the second gear clutch are both in the disengaged state, the first gear gear 16 is driven by the planetary gear 12 to rotate relative to the planetary carrier 4, and the first gear ring gear 6 is driven by the planetary gear 12 to rotate. The planetary carrier 4 has no circumferential rotation and cannot transmit power to the output shaft 10, that is, the gearbox is in neutral.

As shown in Figures 1 and 2, the first gear clutch is switched to the engaged state, the second gear clutch remains in the disengaged state, and the gearbox is switched to the first gear. The first gear power transmission route is as follows: the sun gear shaft 2 rotates, and the sun gear shaft 2 drives the planetary gear 12 to rotate relative to the planetary carrier 4 through the first gear gear 16. Since the first gear clutch is in the engaged state, the first gear clutch causes the first gear ring 6 to be fixed by the gearbox body, that is, the first gear ring 6 is fixed, and the planetary gear 12 will rotate circumferentially around the sun gear shaft 2 together with the planetary carrier 4. The planetary carrier 4 drives the output transmission gear 19 to rotate, and the output transmission gear 19 transmits power to the output shaft 10 through the output gear 11.

As shown in Figures 1 and 3, the first gear clutch is kept in a disengaged state, the second gear clutch is switched to a engaged state, the gearbox is switched to the second gear, and the second gear power transmission route is as follows: the sun gear shaft 2 rotates, and since the second gear clutch is in a engaged state, the second gear clutch makes the second gear gear 13 and the output transmission gear 19 relatively fixed, the sun gear shaft 2 drives the output transmission gear 19 to rotate through the second gear gear 13, and the output transmission gear 19 transmits power to the output shaft 10 through the output gear 11.

This embodiment also provides an electric engineering machine, comprising a travel motor and the above-mentioned gearbox, wherein the output end of the travel motor is drivingly connected to the sun gear shaft 2 of the gearbox. It should be noted that the electric engineering machine can be a loader or a forklift.

The gearbox provided by the embodiment of the utility model has three gears, namely neutral, first gear and second gear, which can meet the speed change requirements of electric engineering machinery, avoid large speed changes of the travel motor in a short time, and improve the response speed of the output speed of the gearbox; and the output shaft 10 of the gearbox can be changed to realize the reverse gear function by simply changing the output direction of the travel motor. The gearbox has a simple structure, a reasonable layout, a high degree of integration and occupies a small space.

Optionally, the first gear 16, the second gear 13 and the sun gear shaft 2 are integrally formed. In other embodiments, the first gear 16 and the second gear 13 can also be connected to the sun gear shaft 2 through a key such as a spline or a flat key.

Optionally, a plurality of planetary gears 12 are provided, and the plurality of planetary gears 12 are circumferentially spaced apart and arranged between the first gear 16 and the first gear ring 6 .

Optionally, the planetary carrier 4 is fixedly connected to a planetary shaft 5 corresponding one to one with the planetary gear 12, and the planetary gear 12 is rotatably connected to the corresponding planetary shaft 5 through a bearing to realize the rotational connection between the planetary gear 12 and the planetary carrier 4; the planetary shaft 5 is fixedly connected to the output transmission gear 19 to realize the fixed connection between the planetary carrier 4 and the output transmission gear 19.

Optionally, the output gear 11 and the output shaft 10 are connected via a spline, which is convenient and quick to connect.

Optionally, the gearbox also includes an input shaft 1 and an intermediate shaft 23 both rotatably connected to the gearbox body, an input gear 22 is fixed on the input shaft 1, an input transmission gear 3 is fixed on the intermediate shaft 23, the input gear 22 is meshed with the input transmission gear 3, and the intermediate shaft 23 is fixedly connected to the sun gear shaft 2.

Exemplarily, the input shaft 1 is spline-connected to the input gear 22, the input transmission gear 3 is spline-connected to the intermediate shaft 23, and the intermediate shaft 23 is spline-connected to the sun gear shaft 2. Both ends of the intermediate shaft 23 are rotatably connected to the gearbox body through bearings, and both ends of the input shaft 1 are rotatably connected to the gearbox body through bearings.

Furthermore, a first-gear chamber 25 is provided on the gearbox body, and the first-gear clutch comprises a first-gear friction pair 7 and a first-gear piston 21, wherein the first-gear friction pair 7 is connected to the first-gear gear ring 6; the first-gear piston 21 is axially movable in the first-gear chamber 25, so as to go back and forth between a first-gear locking position axially pressed with the first-gear friction pair 7 and a first-gear unlocking position separated from the first-gear friction pair 7. When the first-gear piston 21 is in the first-gear locking position, the first-gear friction pair 7 is fixed relative to the first-gear piston 21; when the first-gear piston 21 is in the first-gear unlocking position, the first-gear friction pair 7 can rotate relative to the first-gear piston 21.

When it is necessary to switch the first gear clutch to the engaged state, the first gear piston 21 is controlled to move axially to the first gear locking position, the first gear piston 21 is axially pressed against the first gear friction pair 7, and the first gear ring gear 6 is restricted from rotating relative to the first gear piston 21; since the first gear piston 21 is restricted from rotating relative to the gearbox body, the first gear friction pair 7 will be restricted from rotating relative to the gearbox body, and the first gear ring gear 6 connected to the first gear friction pair 7 will be restricted from rotating relative to the gearbox body.

When the first gear clutch needs to be switched to a disengaged state, the first gear piston 21 is controlled to move axially to the first gear unlocking position, so that the first gear piston 21 is separated from the first gear friction pair 7. The first gear friction pair 7 loses the axial pressing force of the first gear piston 21, and the first gear friction pair 7 can rotate relative to the first gear piston 21. Since the first gear piston 21 is restricted from rotating relative to the gearbox body, the first gear ring gear 6 connected to the first gear friction pair 7 can rotate relative to the gearbox body.

Furthermore, the gearbox body is provided with a first gear inlet and outlet flow channel connected to the first gear chamber 25, and the first gear clutch also includes a first gear elastic return member 8, which can apply an axial force to the first gear piston 21 so that the first gear piston 21 has a movement tendency of axially moving from the first gear locking position to the first gear unlocking position.

When it is necessary to switch the first gear clutch to the engaged state, oil is supplied to the first gear chamber 25 through the first gear inlet and outlet passage. Under the action of the oil pressure of the pressure oil in the first gear chamber 25, the first gear piston 21 will move axially to the first gear locking position. During this process, the first gear elastic reset member 8 is compressed.

When the first gear clutch needs to be switched to the disengaged state, the pressure oil in the first gear chamber 25 is discharged through the first gear inlet and outlet passage, and the first gear elastic return member 8 will push the first gear piston 21 from the first gear locking position back to the first gear unlocking position.

In other embodiments, an electromagnet may be used to drive the first-gear piston 21 to reciprocate, which will not be described in detail here.

Optionally, the first gear elastic reset member 8 is radially spaced outside the first gear friction pair 7. This can prevent the first gear elastic reset member 8 from interfering with the axial movement of the first gear piston 21. In other embodiments, the first gear friction pair 7 can also be radially spaced outside the first gear elastic reset member 8.

Exemplarily, the first-stage elastic reset member 8 is a compression spring. It should be noted that the first-stage elastic reset member 8 is not limited to a compression spring, and a disc spring or the like can also be used.

Exemplarily, the first gear ring gear 6 has an inner spline and an outer spline. The inner spline of the first gear ring gear 6 is meshedly connected with the planetary gear 12 , and the outer spline of the first gear ring gear 6 is meshedly connected with the first gear friction pair 7 . The connection method is simple.

In order to facilitate the installation of the first gear clutch, optionally, the gearbox body includes a box body 20 and a middle cover 9 connected to the box body 20, the first gear chamber 25 is an annular chamber provided on the box body 20, the first gear elastic reset member 8 and the first gear gear ring 6 are both provided on the side of the first gear piston 21 facing away from the first gear chamber 25, and the two ends of the first gear elastic reset member 8 are respectively abutted against the first gear piston 21 and the middle cover 9. Optionally, the box body 20 and the middle cover 9 are detachably connected, such as being connected by a plurality of first fasteners distributed at circumferential intervals, so that disassembly and assembly are more convenient. Exemplarily, the first fastener is a bolt.

Further, the second gear clutch comprises a second gear cylinder body 15, a second gear friction pair 18 and a second gear piston 17, wherein the second gear cylinder body 15 is rotatably connected to the sun gear shaft 2 and the gearbox body, the second gear cylinder body 15 is fixedly connected to the output transmission gear 19, and a second gear chamber 26 is provided on the second gear cylinder body 15; the second gear friction pair 18 is meshingly connected to the second gear gear 13; the second gear piston 17 is restricted from rotating relative to the second gear cylinder body 15, and the second gear piston 17 is axially movable in the second gear chamber 26 to go back and forth between a second gear locking position axially pressed against the second gear friction pair 18 and a second gear unlocking position separated from the second gear friction pair 18. When the second gear piston 17 is in the second gear locking position, the second gear friction pair 18 is fixed relative to the second gear piston 17; when the second gear piston 17 is in the second gear unlocking position, the second gear friction pair 18 can rotate relative to the second gear piston 17.

When it is necessary to switch the second gear clutch to the engaged state, the second gear piston 17 is controlled to move axially to the second gear locking position, the second gear piston 17 is axially pressed against the second gear friction pair 18, and the second gear friction pair 18 is restricted from rotating relative to the second gear piston 17. Since the second gear piston 17 is restricted from rotating relative to the second gear cylinder body 15, and the second gear cylinder body 15 is fixedly connected to the output transmission gear 19, the second gear friction pair 18 is restricted from rotating relative to the output transmission gear 19, and the second gear 13 connected to the second gear friction pair 18 is restricted from rotating relative to the output transmission gear 19.

When the second gear clutch needs to be switched to the disengaged state, the second gear piston 17 is controlled to move axially to the second gear unlocking position, so that the second gear piston 17 is separated from the second gear friction pair 18, and the second gear friction pair 18 loses the axial pressing force of the second gear piston 17, so that the second gear gear 13 can rotate relative to the output transmission gear 19.

Exemplarily, a cylinder connecting portion is formed at one end of the second gear cylinder body 15, one end of the cylinder connecting portion is inserted into one end of the sun gear shaft 2 and is rotatably connected to the sun gear shaft 2 through a bearing, and the other end is rotatably connected to the transmission case through a bearing, and the other end of the sun gear shaft 2 is inserted into the intermediate shaft 23 and fixed to the intermediate shaft 23, and the sun gear shaft 2 passes through the planetary carrier 4 and is rotatably connected to the planetary carrier 4 through a bearing.

Optionally, the second-gear cylinder body 15 and the output transmission gear 19 are connected by a plurality of fasteners such as bolts, which are convenient for disassembly and assembly, and facilitate the installation of the second-gear piston 17 and the second-gear elastic return member 14.

Furthermore, the second gear cylinder body 15 is provided with a second gear inlet and outlet channel 27 connected to the second gear chamber 26, and the second gear clutch also includes a second gear elastic reset member 14, which can apply an axial force to the second gear piston 17 so that the second gear piston 17 has a movement tendency of axially moving from the second gear locking position to the second gear unlocking position.

When the second gear clutch needs to be switched to the engaged state, oil is supplied to the second gear chamber 26 through the second gear inlet and outlet channel 27. Under the action of the oil pressure of the pressure oil in the second gear chamber 26, the second gear piston 17 will move axially to the second gear locking position. During this process, the second gear elastic reset member 14 is compressed.

When the second gear clutch needs to be switched to the disengaged state, the pressure oil in the second gear chamber 26 is discharged through the second gear inlet and outlet channel 27, and the second gear elastic reset member 14 will push the second gear piston 17 from the second gear locked position back to the second gear unlocked position.

In other embodiments, an electromagnet may be used to drive the second-gear piston 17 to reciprocate, which will not be described in detail here.

Optionally, the second gear friction pair 18 is radially spaced outside the second gear elastic reset member 14. This can prevent the second gear elastic reset member 14 from interfering with the axial movement of the second gear piston 17. In other embodiments, the second gear elastic reset member 14 can also be radially spaced outside the second gear friction pair 18.

Exemplarily, the second-gear elastic reset member 14 is a disc spring. It should be noted that the second-gear elastic reset member 14 is not limited to a disc spring, and a compression spring or the like can also be used.

Optionally, the second gear chamber 26 is an annular chamber arranged on the second gear cylinder body 15, and the second gear elastic reset member 14 and the second gear gear 13 are both arranged on the side of the first gear piston 21 facing away from the second gear chamber 26. The gearbox also includes a retaining ring 24 fixed to the second gear cylinder body 15, and the second gear gear 13 and the second gear elastic reset member 14 are located at both axial ends of the retaining ring 24 and abut against the retaining ring 24, and the retaining ring 24 is used to limit the second gear 13 and the second gear elastic reset member 14.

In order to facilitate the calculation of the transmission ratio of the gearbox when it is in the first gear and the second gear respectively, the number of teeth of the input gear 22 is recorded as Z1, the number of teeth of the input transmission gear 3 is recorded as Z2, the number of teeth of the first gear gear 16 is recorded as Z3, the number of teeth of the planetary gear 12 is recorded as Z4, the number of teeth of the first gear ring gear 6 is recorded as Z5, the number of teeth of the output transmission gear 19 is recorded as Z6, and the number of teeth of the output gear 11 is recorded as Z7.

When the gearbox is in the first gear, the transmission ratio of the gearbox is recorded as i1, i1 = K1 × K2; when the gearbox is in the second gear, the transmission ratio of the gearbox is recorded as i2, i2 = K1 × K2. Among them, K1 = Z2/Z1, K2 = Z7/Z6, K3 = Z5/Z3, and the transmission ratio of the planetary transmission unit is 1 + K3.

In addition, the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (10)

1. The transmission is characterized by comprising a transmission body, a first gear ring (6), a first gear clutch and a planetary transmission unit, wherein the first gear ring (6) can be selectively fixed or rotated relative to the transmission body through the first gear clutch, the planetary transmission unit comprises a planet carrier (4) rotatably connected to the transmission body, and planet gears (12) rotatably mounted on the planet carrier (4), and the planet gears (12) are in meshed connection with the first gear ring (6);

The gearbox further comprises an output transmission gear (19) fixedly connected with the planet carrier (4), and the output transmission gear and the planet carrier are all rotatably connected with the gearbox body:

A first-gear (16) and a second-gear (13) are fixed on the sun gear shaft (2), and the first-gear (16) is meshed with the planet gear (12); the output transmission gear (19) can be selectively fixed or rotated relative to the second gear (13) through a second gear clutch;

the output shaft (10), output gear (11) has been set firmly on output shaft (10), output gear (11) with output drive gear (19) meshing.

2. Gearbox according to claim 1, characterised in that the gearbox housing is provided with a first gear chamber (25), the first gear clutch comprising:

A first-gear friction pair (7), wherein the first-gear friction pair (7) is connected with the first-gear ring (6);

A first-gear piston (21), the first-gear piston (21) being restrained from rotating relative to the transmission housing, the first-gear piston (21) being axially movably disposed within the first-gear chamber (25) to and from a first-gear locking position axially pressed against the first-gear friction pair (7) and a first-gear unlocking position separated from the first-gear friction pair (7);

when the first-gear piston (21) is in the first-gear locking position, the first-gear friction pair (7) is fixed relative to the first-gear piston (21); when the first-gear piston (21) is in the first-gear unlocking position, the first-gear friction pair (7) can rotate relative to the first-gear piston (21).

3. A gearbox according to claim 2, wherein the gearbox housing is provided with a first gear inlet and outlet flow channel in communication with the first gear chamber (25), and wherein the first gear clutch further comprises a first gear elastic return member (8), wherein the first gear elastic return member (8) is capable of exerting an axial force on the first gear piston (21) such that the first gear piston (21) has a movement tendency to move axially from the first gear locking position to the first gear unlocking position.

4. A gearbox according to claim 3, characterised in that the first-gear elastic return element (8) is radially arranged in a spaced-apart manner outside the first-gear friction pair (7).

5. Gearbox according to claim 2, characterized in that the first gear ring (6) has internal and external splines, the internal splines of the first gear ring (6) being in meshed connection with the planet wheels (12), the external splines of the first gear ring (6) being in meshed connection with the first gear friction pair (7).

6. The gearbox of any one of claims 1 to 5, wherein the two-speed clutch comprises:

The second-gear cylinder body (15), the second-gear cylinder body (15) is rotationally connected with the sun gear shaft (2) and the gearbox body, the second-gear cylinder body (15) is fixedly connected with the output transmission gear (19), and a second-gear cavity (26) is arranged on the second-gear cylinder body (15);

A second-gear friction pair (18), wherein the second-gear friction pair (18) is connected with the second-gear (13);

A second-gear piston (17), wherein the second-gear piston (17) is limited to rotate relative to the second-gear cylinder (15), and the second-gear piston (17) is axially movably arranged in the second-gear chamber (26) to move to and from a second-gear locking position axially pressed against the second-gear friction pair (18) and a second-gear unlocking position separated from the second-gear friction pair (18);

When the second-gear piston (17) is positioned at the second-gear locking position, the second-gear friction pair (18) is fixed relative to the second-gear piston (17); when the second-gear piston (17) is in the second-gear unlocking position, the second-gear friction pair (18) can rotate relative to the second-gear piston (17).

7. The gearbox according to claim 6, characterized in that a secondary gear inlet and outlet runner (27) communicating with the secondary gear chamber (26) is provided on the secondary gear cylinder (15), the secondary gear clutch further comprises a secondary gear elastic return member (14), and the secondary gear elastic return member (14) can apply an axial force to the secondary gear piston (17) so that the secondary gear piston (17) has a movement tendency of axially moving from the secondary gear locking position to the secondary gear unlocking position.

8. Gearbox according to claim 7, characterized in that the secondary friction pair (18) is radially sleeved outside the secondary elastic return element (14) at intervals.

9. The gearbox according to any one of claims 1 to 5, it is characterized in that the method comprises the steps of, and the device also comprises a transmission body which is rotationally connected with the transmission body:

An input shaft (1), wherein an input gear (22) is fixed on the input shaft (1);

The middle shaft (23), be fixed with input transmission gear (3) on middle shaft (23), input gear (22) with input transmission gear (3) meshing, middle shaft (23) with sun gear shaft (2) fixed connection.

10. An electric engineering machine, characterized by comprising a walking motor and a gearbox according to any one of claims 1 to 9, wherein the output end of the walking motor is in transmission connection with a sun gear shaft (2) of the gearbox, and the electric engineering machine is a loader or a forklift.