Transmission and New Energy Construction Machinery

Abstract

The present invention belongs to the technical field of vehicles, and discloses a transmission and a new energy construction machinery. For the transmission, the first planetary gear structure includes a first sun gear, a first ring gear, a first planetary gear that meshes with both the first sun gear and the first ring gear, and a first planetary carrier that supports the first planetary gear. The first clutch can connect or disconnect the first ring gear and the housing. The second planetary gear structure includes a second sun gear, a second ring gear, a second planetary gear that meshes with both the second sun gear and the second ring gear, and a second planetary carrier that supports the second planetary gear. The second ring gear is fixedly connected to the first planetary carrier. The second clutch can connect or disconnect the second ring gear and the housing. The gear shaft is fixedly arranged through the second sun gear. Both the output gear and the second planetary carrier are fixedly connected to the connecting plate. The output gear is in transmission connection with the output shaft of the transmission. The third clutch can connect or disconnect the output gear and the gear shaft. It can meet the multi-gear requirements of new energy construction machinery.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering machinery, and in particular to a gearbox and new energy engineering machinery. Background Art

[0002] The gearbox is one of the key components of the power system of engineering machinery. It is a mechanism used to change the speed and torque from the power source. In recent years, new energy technology has developed rapidly. New energy technology drives the gearbox by an electric motor. The motor is different from the traditional engine because of its high transmission efficiency, wide speed regulation range, and forward or reverse rotation, which can greatly simplify the demand for the gearbox. At present, domestic engineering machinery generally directly borrows the existing gearbox assembly configured on the diesel engine. However, the gearbox assembly configured on the diesel engine has defects such as heavy weight, multiple gears, cumbersome operation, and high cost. In the prior art, the gearbox configured on the electric loader is generally simplified into two gears, high speed gear and low speed gear. The high speed gear meets the transition working condition, and the low speed gear meets the working condition. For example, the 2-speed planetary structure gearbox and the 2-speed fixed shaft structure gearbox that have been released are both 2-speed gearboxes. However, engineering machinery, especially shovel-loading machinery, requires a gearbox with multiple gears to meet the use requirements of different working conditions. For example, the new energy mining truck is different from the loader. Generally, the 2-speed gearbox is difficult to meet the needs of the new energy mining truck. It requires a gearbox with at least 3 forward gears. Therefore, there is an urgent need for a multi-speed gearbox suitable for new energy engineering machinery. Summary of the invention

[0003] The purpose of the present invention is to provide a gearbox and a new energy engineering machinery to solve the problem that a multi-gear gearbox suitable for new energy engineering machinery is urgently needed.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] Gearbox, including:

[0006] case;

[0007] An input shaft, the input shaft being rotatably disposed on the housing;

[0008] a first planetary gear structure, the first planetary gear structure comprising a first sun gear fixedly sleeved on the input shaft, a first ring gear, a first planetary gear meshed with the first sun gear and the first ring gear, and a first planet carrier supporting the first planetary gear;

[0009] a first clutch, the first clutch being capable of connecting or disconnecting the first ring gear and the housing;

[0010] a second planetary gear structure, the second planetary gear structure comprising a second sun gear fixedly sleeved on the input shaft, a second ring gear, a second planetary gear meshed with the second sun gear and the second ring gear, and a second planet carrier supporting the second planetary gear, the second ring gear being fixedly connected to the first planet carrier;

[0011] a second clutch, the second clutch being capable of connecting or disconnecting the second ring gear and the housing;

[0012] a gear shaft, the gear shaft being coaxially arranged with the input shaft and the gear shaft being fixedly arranged through the second sun gear;

[0013] A connecting plate and an output gear, wherein the output gear and the second planet carrier are both fixedly connected to the connecting plate, and the output gear is drivingly connected to the output shaft of the gearbox;

[0014] A third clutch is configured to connect or disconnect the output gear from the gear shaft.

[0015] As a preferred solution of the above-mentioned gearbox, the first clutch includes a first piston, a first friction pair and an isolation frame fixedly connected to the housing, the housing is provided with a first accommodating chamber and a first oil inlet that are connected, the first piston is slidably arranged in the first accommodating chamber, the first friction pair is connected to the first ring gear, the first friction pair is located between the first piston and the isolation frame, and the first piston can push the first friction pair to press the isolation frame to fix the relative positions of the first ring gear and the isolation frame.

[0016] As a preferred solution of the above-mentioned gearbox, the second clutch includes a second piston, a second friction pair and a first cylinder body, the first cylinder body is fixedly arranged on the housing, the first cylinder body is provided with a second accommodating chamber and a second oil inlet that are connected, the second piston is slidably penetrated into the second accommodating chamber, the second friction pair is connected to the second ring gear, the second friction pair is located between the second piston and the isolation frame, and the second piston can push the second friction pair to press the isolation frame to fix the relative position of the second ring gear and the isolation frame.

[0017] As a preferred solution of the above gearbox, the gearbox further includes a first resetting elastic member, and two ends of the first resetting elastic member are respectively in contact with the first piston and the second piston.

[0018] As a preferred solution of the above-mentioned gearbox, the third clutch includes a third piston, a third friction pair and a second cylinder body, the second cylinder body is fixedly arranged on the housing, the second cylinder body is provided with a third accommodating chamber and a third oil inlet that are connected, the third piston is slidably penetrated in the third accommodating chamber, the third friction pair is connected to the gear shaft, the third friction pair is located between the third piston and the output gear, and the third piston can push the third friction pair to press the output gear so that the relative position of the output gear and the gear shaft is fixed.

[0019] As a preferred solution of the above gearbox, the gearbox further comprises a second return elastic member, and two ends of the second return elastic member are respectively in contact with the third piston and the housing.

[0020] As a preferred solution of the above-mentioned gearbox, the first planetary carrier is fixedly provided with a first connecting tooth, the second ring gear is provided with a first tooth groove, and the first connecting tooth is inserted into the tooth groove.

[0021] As a preferred solution of the above gearbox, the second gear ring is provided with a step surface, and one end of the first connecting tooth along the axial direction abuts against the step surface.

[0022] As a preferred solution of the above-mentioned gearbox, the gearbox also includes a retaining ring, the second gear ring is provided with a limiting groove, the retaining ring is partially inserted into the limiting groove, and the other end of the first connecting tooth along the axial direction abuts against the retaining ring.

[0023] The present invention also provides a new energy engineering machinery, which includes the above-mentioned gearbox.

[0024] Beneficial effects of the present invention:

[0025] The present invention provides a gearbox and a new energy engineering machinery. The gearbox has a first gear ring connected to a first clutch, the first clutch can connect or disconnect the first gear ring and a housing, a first planetary carrier connected to a second gear ring, a second clutch can connect or disconnect the second gear ring and a housing, a gear shaft is fixedly arranged through a second sun gear, an output gear and a second planetary carrier are both fixedly connected to a connecting plate, and a third clutch can connect or disconnect the output gear from the gear shaft. The gearbox is suitable for new energy engineering machinery, the input shaft of the gearbox is connected to the output shaft of the motor by transmission, the gearbox has three gears, when the motor rotates forward, the three gears are all forward gears; when the motor rotates reversely, the three gears are all reverse gears, which can meet the multi-gear requirements of new energy engineering machinery. The gearbox is based on the existing mature gearbox structure, and realizes a multi-gear gearbox with a brand-new transmission route with minimal structural changes. The parts are highly common, and the development cost and verification cycle are greatly reduced, and it is easy to mass produce. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic structural diagram of a gearbox provided by a specific embodiment of the present invention;

[0027] Figure 2 is a structural schematic diagram of a second gear ring of a gearbox provided in a specific embodiment of the present invention;

[0028] Figure 3 is a structural schematic diagram of a first planetary carrier of a gearbox provided by a specific embodiment of the present invention;

[0029] Figure 4 It is a schematic structural diagram of a first gear ring of a gearbox provided in a specific embodiment of the present invention.

[0030] In the figure:

[0031] 1. housing; 101. first oil inlet;

[0032] 2. Input shaft;

[0033] 3. First planetary gear structure; 31. First sun gear; 32. First planetary gear; 33. First ring gear; 34. First planet carrier; 331. Second connecting tooth; 341. First connecting tooth;

[0034] 4. Second planetary gear structure; 41. Second sun gear; 42. Second planetary gear; 43. Second ring gear; 44. Second planet carrier; 431. Step surface; 432. Limiting groove; 433. Third connecting tooth;

[0035] 5. first clutch; 51. first piston; 52. first friction pair; 53. isolation frame;

[0036] 6. Second clutch; 61. Second piston; 62. Second friction pair; 63. First cylinder; 631. Second oil inlet

[0037] 7. Third clutch; 71. Third piston; 72. Third friction pair; 73. Second cylinder; 731. Third oil inlet

[0038] 8. Connecting plate;

[0039] 9. Gear shaft;

[0040] 10. Output gear;

[0041] 11. A first resetting elastic member;

[0042] 12. Retaining ring. DETAILED DESCRIPTION

[0043] The present invention will be 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 parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0044] 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.

[0045] In the present invention, 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.

[0046] In the description of this embodiment, the terms "upper", "lower", "right" and other directions or positional relationships are based on the directions or positional relationships 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 limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0047] The present invention provides a gearbox and a new energy engineering machinery, such as Figure 1As shown, the gearbox includes a housing 1, an input shaft 2, a first planetary gear structure 3, a first clutch 5, a second planetary gear structure 4, a second clutch 6, a second clutch 6, a gear shaft 9, a connecting plate 8, an output gear 10 and a third clutch 7. The input shaft 2 is rotatably arranged on the housing 1. The first planetary gear structure 3 includes a first sun gear 31 fixedly sleeved on the input shaft 2, a first ring gear 33, a first planetary gear 32 meshing with the first sun gear 31 and the first ring gear 33, and a first planet carrier 34 supporting the first planetary gear 32. The first clutch 5 can connect or disconnect the first ring gear 33 and the housing 1. The second planetary gear structure 4 includes A second sun gear 41 fixedly sleeved on the input shaft 2, a second ring gear 43, a second planetary gear 42 meshing with the second sun gear 41 and the second ring gear 43, and a second planetary carrier 44 supporting the second planetary gear 42, the second ring gear 43 is fixedly connected to the first planetary carrier 34, the second clutch 6 can connect or disconnect the second ring gear 43 and the housing 1, the gear shaft 9 is coaxially arranged with the input shaft 2, the gear shaft 9 is fixedly penetrated in the second sun gear 41, the output gear 10 and the second planetary carrier 44 are both fixedly connected to the connecting plate 8, the output gear 10 is drivingly connected to the output shaft of the gearbox, and the third clutch 7 can connect or disconnect the output gear 10 with the gear shaft 9.

[0048] The gearbox is suitable for new energy engineering machinery. The input shaft 2 of the gearbox is drivingly connected to the output shaft of the motor. The gearbox has three gears. When the motor rotates forward, all three gears are forward gears; when the motor rotates reversely, all three gears are reverse gears, which can meet the multi-gear requirements of new energy engineering machinery.

[0049] The number of teeth of the first sun gear 31 is Z1, the number of teeth of the first planetary gear 32 is Z2, the number of teeth of the first ring gear 33 is Z3, the number of teeth of the second sun gear 41 is Z4, the number of teeth of the second planetary gear 42 is Z5, and the number of teeth of the second ring gear 43 is Z6.

[0050] When the first gear is engaged, the second clutch 6 is in a connected state, and the first clutch 5 and the third clutch 7 are in a disconnected state. The second clutch 6 connects the second gear ring 43 and the housing 1, and the position of the second gear ring 43 is fixed. The input shaft 2 drives the second sun gear 41 to rotate, and the second sun gear 41 drives the second planetary carrier 44 to rotate through the second planetary gear 42. The second planetary carrier 44 drives the connecting plate 8 to rotate, and the connecting plate 8 drives the output gear 10 to rotate, and the output gear 10 drives the output shaft of the gearbox to rotate. The second gear ring 43 is fixed, the second sun gear 41 inputs power, and the second planetary carrier 44 outputs power. According to the planetary gear ratio calculation formula, the speed ratio of the first gear is i1=1+K1, where K1=Z6 / Z4.

[0051] When the second gear is engaged, the first clutch 5 is in a connected state, and the second clutch 6 and the third clutch 7 are in a disconnected state. The first clutch 5 connects the first ring gear 33 and the housing 1, the first ring gear 33 is fixed, the input shaft 2 drives the first sun gear 31 and the second sun gear 41 to rotate, the first sun gear 31 drives the first planetary carrier 34 to rotate through the first planetary gear 32, the first planetary carrier 34 drives the second ring gear 43 to rotate, the second ring gear 43 and the second sun gear 41 jointly drive the second planetary carrier 44 to rotate through the second planetary gear 42, the second planetary carrier 44 drives the connecting plate 8 to rotate, the connecting plate 8 drives the output gear 10 to rotate, and the output gear 10 drives the output shaft of the gearbox to rotate. The second ring gear 43 and the second sun gear 41 jointly input power, and the second planetary carrier 44 outputs power. According to the planetary gear ratio calculation formula, the speed ratio of the second gear is i2 = (1 + K1) (1 + K2) / (1 + K1 + K2), where K1 = Z3 / Z1, K2 = Z6 / Z4.

[0052] When the third gear is engaged, the third clutch 7 is in a connected state, and the first clutch 5 and the second clutch 6 are in a disconnected state. The third clutch 7 connects the gear shaft 9 and the output gear 10. The input shaft 2 drives the second sun gear 41 to rotate, the second sun gear 41 drives the gear shaft 9 to rotate, and the gear shaft 9 drives the output gear 10 to rotate. Since the second planetary carrier 44, the connecting plate 8, the output gear 10, the gear shaft 9 and the second sun gear 41 are all fixedly connected, the relative positions of the second sun gear 41 and the second planetary carrier 44 in the second planetary gear structure 4 are locked at this time, so the second ring gear 43, the second planetary carrier 44 and the second sun gear 41 rotate at the same speed, and the speed ratio i3 of the third gear is 1.

[0053] Alternatively, if Figure 1-3 As shown, the first planet carrier 34 is fixedly provided with a first connecting tooth 341, and the second gear ring 43 is provided with a first tooth groove, and the first connecting tooth 341 is inserted into the tooth groove. The outer ring of the first planet carrier 34 is provided with a first connecting tooth 341, and the inner ring of the second gear ring 43 is provided with a first tooth groove. The first planet carrier 34 and the second gear ring 43 are connected through the first connecting tooth 341. Optionally, the number of the first connecting teeth 341 and the number of the first tooth grooves are both multiple, and the multiple first connecting teeth 341 and the multiple first tooth grooves are plugged in one-to-one.

[0054] Optionally, the second gear ring 43 is provided with a step surface 431, and one end of the first connecting tooth 341 along the axial direction abuts against the step surface 431. The step surface 431 is used to limit the first connecting tooth 341 in the axial direction.

[0055] Optionally, the gearbox further includes a retaining ring 12, the second gear ring 43 is provided with a limiting groove 432, the retaining ring 12 is partially inserted into the limiting groove 432, and the other end of the first connecting tooth 341 along the axial direction abuts against the retaining ring 12. The retaining ring 12 is used to axially limit the first connecting tooth 341. The first connecting tooth 341 is located between the step surface 431 and the retaining ring 12 to prevent the first connecting tooth 341 from moving along the axial direction.

[0056] Optionally, the first clutch 5 includes a first piston 51, a first friction pair 52, and an isolating frame 53 fixedly connected to the housing 1. The housing 1 is provided with a first accommodating chamber and a first oil inlet 101 that are connected. The first piston 51 is slidably arranged in the first accommodating chamber. The first friction pair 52 is connected to the first gear ring 33. The first friction pair 52 is located between the first piston 51 and the isolating frame 53. The first piston 51 can push the first friction pair 52 to press the isolating frame 53 so that the relative position of the first gear ring 33 and the isolating frame 53 is fixed. When the second gear is engaged, the first oil inlet 101 enters oil, pushing the first piston 51 to slide in the direction close to the first friction pair 52. The first piston 51 pushes the first friction pair 52 to press the isolating frame 53. Since the first friction pair 52 is connected to the first gear ring 33 and the isolating frame 53 is connected to the housing 1, when the first friction pair 52 presses the isolating frame 53, the first gear ring 33 is connected to the housing 1.

[0057] Alternatively, if Figure 1 and Figure 4 As shown, the outer ring of the first gear ring 33 is uniformly distributed with a plurality of second connecting teeth 331, the first friction pair 52 is provided with a plurality of second tooth grooves, the plurality of second connecting teeth 331 are plugged into the plurality of second tooth grooves one by one, the second tooth grooves extend axially, the second connecting teeth 331 can slide axially in the second tooth grooves, and the second gear ring 43 cannot rotate relative to the first friction pair 52. The first gear ring 33 is connected to the first friction pair 52 through the second connecting teeth 331. In other embodiments, the first gear ring 33 and the first friction pair 52 can also be connected by a key.

[0058] Optionally, the second clutch 6 includes a second piston 61, a second friction pair 62 and a first cylinder 63, the first cylinder 63 is fixedly arranged on the housing 1, the first cylinder 63 is provided with a second accommodating chamber and a second oil inlet 631 which are connected, the second piston 61 is slidably arranged in the second accommodating chamber, the second friction pair 62 is connected to the second gear ring 43, the second friction pair 62 is located between the second piston 61 and the isolation frame 53, and the second piston 61 can push the second friction pair 62 to press the isolation frame 53 so that the relative position of the second gear ring 43 and the isolation frame 53 is fixed. When the first gear is engaged, the second oil inlet 631 enters oil, pushing the second piston 61 to slide in the direction close to the second friction pair 62 until the second friction pair 62 is pushed to press the isolation frame 53. Since the isolation frame 53 is fixedly connected to the housing 1, the second friction pair 62 is connected to the second gear ring 43. When the second friction pair 62 presses the isolation frame 53, the second gear ring 43 is connected to the housing 1. It can be understood that the first clutch 5 and the second clutch 6 share a spacer frame 53 , and the first friction pair 52 and the second friction pair 62 are respectively located on both sides of the spacer frame 53 .

[0059] Alternatively, if Figure 1 and Figure 2 As shown, the outer ring of the second gear ring 43 is uniformly distributed with a plurality of third connecting teeth 433, the second friction pair 62 is provided with a plurality of third tooth grooves, the plurality of third connecting teeth 433 are plugged into the plurality of third tooth grooves one by one, the third tooth grooves extend axially, the third connecting teeth 433 slide axially in the third tooth grooves, and the second gear ring 43 cannot rotate relative to the second friction pair 62. In other embodiments, the second gear ring 43 and the second friction pair 62 can also be connected by a key.

[0060] Alternatively, if Figure 1 As shown, the gearbox further includes a first return elastic member 11, and both ends of the first return elastic member 11 are respectively in contact with the first piston 51 and the second piston 61. It can be understood that the first clutch 5 and the second clutch 6 share a first return elastic member 11, and the first return elastic member 11 can push the first piston 51 to slide in the direction close to the first oil inlet 101 until one end of the first piston 51 is in contact with the housing 1, and can also push the second piston 61 to slide in the direction close to the second oil inlet 631 until one end of the second piston 61 is in contact with the first cylinder body 63.

[0061] Optionally, the third clutch 7 includes a third piston 71, a third friction pair 72 and a second cylinder 73, the second cylinder 73 is fixedly arranged on the housing 1, the second cylinder 73 is provided with a third accommodating chamber and a third oil inlet 731 which are connected, the third piston 71 is slidably arranged in the third accommodating chamber, the third friction pair 72 is connected to the gear shaft 9, the third friction pair 72 is located between the third piston 71 and the output gear 10, and the third piston 71 can push the third friction pair 72 to press the output gear 10 so that the relative position of the output gear 10 and the gear shaft 9 is fixed. When the third gear is engaged, the third oil inlet 731 enters oil, pushing the third piston 71 to slide in the direction of the third friction pair 72 until the third friction pair 72 presses the output gear 10, and since the third friction pair 72 is connected to the gear shaft 9, when the third friction pair 72 presses the output gear 10, the output gear 10 is connected to the gear shaft 9.

[0062] Optionally, the outer ring of the gear shaft 9 is evenly distributed with a plurality of fourth connecting teeth, the third friction pair 72 is provided with a plurality of fourth tooth grooves, the plurality of fourth connecting teeth are plugged into the plurality of fourth tooth grooves one by one, the fourth tooth grooves extend axially, the fourth connecting teeth can slide axially in the fourth tooth grooves, and the gear shaft 9 cannot rotate relative to the third friction pair 72. In other embodiments, the gear shaft 9 and the third friction pair 72 can also be connected by a key.

[0063] Optionally, the gearbox further comprises a second resetting elastic member, and two ends of the second resetting elastic member respectively abut against the third piston 71 and the housing 1. The elastic restoring force of the second resetting elastic member can push the third piston 71 to slide towards the third oil inlet 731.

[0064] The present invention also provides a new energy engineering machinery, which includes the above-mentioned gearbox and a motor, wherein the motor is drivingly connected to an input shaft 2 of the gearbox, and the motor inputs power to the gearbox.

[0065] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. Transmission gearbox, characterized in that, it includes: a housing (1); an input shaft (2), the input shaft (2) is rotatably arranged in the housing (1); a first planetary gear structure (3), the first planetary gear structure (3) includes a first sun gear (31) fixedly sleeved on the input shaft (2), a first ring gear (33), a first planetary gear (32) meshing with both the first sun gear (31) and the first ring gear (33), and a first planetary carrier (34) supporting the first planetary gear (32); a first clutch (5), the first clutch (5) can connect or disconnect the first ring gear (33) and the housing (1); a second planetary gear structure (4), the second planetary gear structure (4) includes a second sun gear (41) fixedly sleeved on the input shaft (2), a second ring gear (43), a second planetary gear (42) meshing with both the second sun gear (41) and the second ring gear (43), and a second planetary carrier (44) supporting the second planetary gear (42), the second ring gear (43) is fixedly connected to the first planetary carrier (34); a second clutch (6), the second clutch (6) can connect or disconnect the second ring gear (43) and the housing (1); a gear shaft (9), the gear shaft (9) is coaxially arranged with the input shaft (2), the gear shaft (9) is fixedly arranged through the second sun gear (41); a connecting disc (8) and an output gear (10), both the output gear (10) and the second planetary carrier (44) are fixedly connected to the connecting disc (8), the output gear (10) is in transmission connection with the output shaft of the transmission gearbox; a third clutch (7), the third clutch (7) can connect or disconnect the output gear (10) and the gear shaft (9).

2. The transmission gearbox according to claim 1, characterized in that, the first clutch (5) includes a first piston (51), a first friction pair (52) and an isolation bracket (53) fixedly connected to the housing (1), the housing (1) is provided with a first accommodation cavity and a first oil inlet (101) communicated with each other, the first piston (51) is slidably arranged through the first accommodation cavity, the first friction pair (52) is connected to the first ring gear (33), the first friction pair (52) is located between the first piston (51) and the isolation bracket (53), and the first piston (51) can push the first friction pair (52) to press against the isolation bracket (53) so that the relative positions of the first ring gear (33) and the isolation bracket (53) are fixed.

3. The transmission gearbox according to claim 2, characterized in that, The second clutch (6) includes a second piston (61), a second friction pair (62), and a first cylinder block (63). The first cylinder block (63) is fixedly arranged on the housing (1). The first cylinder block (63) is provided with a second accommodation cavity and a second oil inlet (631) that communicate with each other. The second piston (61) slidably penetrates through the second accommodation cavity. The second friction pair (62) is connected to the second gear ring (43). The second friction pair (62) is located between the second piston (61) and the isolation frame (53). The second piston (61) can push the second friction pair (62) to press against the isolation frame (53) so that the relative positions of the second gear ring (43) and the isolation frame (53) are fixed.

4. The transmission according to claim 3, wherein, the transmission further includes a first reset elastic member (11), and two ends of the first reset elastic member (11) are respectively abutted against the first piston (51) and the second piston (61).

5. The transmission according to claim 1, wherein, the third clutch (7) includes a third piston (71), a third friction pair (72), and a second cylinder block (73). The second cylinder block (73) is fixedly arranged on the housing (1). The second cylinder block (73) is provided with a third accommodation cavity and a third oil inlet (731) that communicate with each other. The third piston (71) slidably penetrates through the third accommodation cavity. The third friction pair (72) is connected to the gear shaft (9). The third friction pair (72) is located between the third piston (71) and the output gear (10). The third piston (71) can push the third friction pair (72) to press against the output gear (10) so that the relative positions of the output gear (10) and the gear shaft (9) are fixed.

6. The transmission according to claim 5, wherein, the transmission further includes a second reset elastic member, and two ends of the second reset elastic member are respectively abutted against the third piston (71) and the housing (1).

7. The transmission according to claim 1, wherein, a first connecting tooth (341) is fixedly arranged on the first planet carrier (34). The second gear ring (43) is provided with a first tooth groove. The first connecting tooth (341) is inserted into the tooth groove.

8. The transmission according to claim 7, wherein, the second gear ring (43) is provided with a stepped surface (431), and one end of the first connecting tooth (341) in the axial direction abuts against the stepped surface (431).

9. The transmission according to claim 7, wherein, the transmission further includes a snap ring (12). The second gear ring (43) is provided with a limiting groove (432). The snap ring (12) is partially inserted into the limiting groove (432). The other end of the first connecting tooth (341) in the axial direction abuts against the snap ring (12).

10. A new energy construction machinery, wherein, it includes the transmission according to any one of claims 1-9.

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