Double-gear gearbox

Abstract

The utility model discloses a double-gear speed changing box which comprises a motor flange used for installing a motor, a gear shifting mechanism, a planetary gear train achieving transmission and speed changing and an output main shaft. The motor flange, the planetary gear train and the output main shaft are coaxially arranged; the planetary gear train comprises a gear shaft, a sun gear, a planetary gear, a first inner gear ring, a planetary support, a shell, a high-speed gear fixedly arranged on the gear shaft and a low-speed gear fixedly arranged on the planetary support. The gear shifting mechanism comprises a cylinder seat, a cylinder, a shifting fork and a sliding gear sleeve; the output main shaft comprises a synchronizing wheel and a synchronizing wheel shaft, one end of the sliding gear sleeve is in spline connection with the synchronizing wheel shaft, the other end of the sliding gear sleeve is in spline connection with the low-speed wheel or the high-speed wheel, and the device is compact in overall structure, small in part number and easy to operate.

Description

Technical Field

[0001] The utility model relates to the technical field of gearboxes, in particular to a double-speed gearbox. Background Art

[0002] The gearbox is a gear transmission device that can fix or change the transmission ratio between the output shaft and the input shaft. It is mainly used to adjust the output speed and torque, adjust the operating speed of the machine, and change the movement mode of the equipment. The gearboxes currently used in mechanical equipment are relatively complex in structure, large in size, and have weak load-bearing capacity.

[0003] In view of the above problems, it is necessary to provide a gearbox that can achieve a compact and lightweight layout, while ensuring efficient operation of the motor under different working conditions and reliable layout of the structural connection strength. Utility Model Content

[0004] Purpose of the utility model:

[0005] In order to overcome the problems existing in the prior art, the utility model provides a dual-speed gearbox, which solves the problems that most gearboxes in the prior art have relatively complex structures, large volumes and weak load-bearing capacity.

[0006] In order to solve the above problems, the utility model adopts the following technical solutions:

[0007] A two-speed gearbox, comprising a motor flange for mounting an electric motor, a shift mechanism, a planetary gear train for realizing transmission and speed change, and an output spindle; the motor flange, the planetary gear train, and the output spindle are coaxially arranged;

[0008] The planetary gear train includes a gear shaft drivingly connected to the motor, a sun gear fixedly arranged on the gear shaft, a planetary gear meshingly connected to the sun gear, a first inner gear ring meshingly connected to the planetary gear, a planetary support for mounting the planetary gear, a housing fixedly connected to the first inner gear ring, a high-speed gear fixedly arranged on the gear shaft, and a low-speed gear fixedly arranged on the planetary support;

[0009] The shift mechanism comprises a cylinder seat, a cylinder, a shift fork drivingly connected to the cylinder, and a sliding gear sleeve drivingly connected to the shift fork;

[0010] The output main shaft comprises a synchronous wheel and a synchronous wheel shaft, and the outer periphery of one end of the synchronous wheel shaft close to the motor flange is provided with spline teeth connected with the sliding gear sleeve spline;

[0011] One end of the sliding gear sleeve is spline-connected with the synchronous wheel shaft, and the other end is spline-connected with the low-speed wheel or the high-speed wheel under the push of the shift fork.

[0012] Preferably, the planetary gear train further comprises four mounting holes opened in the circumference of the planetary bracket, planetary shafts are fixedly mounted in the mounting holes, needle bearings are sleeved on the planetary shafts, and the planetary wheels are rotatably arranged on the planetary shafts via the needle bearings.

[0013] Preferably, the output main shaft also includes a pulley flange, a fifth ball bearing, a second bearing spacer, a second flat key and a sixth ball bearing, and a synchronous wheel. The synchronous wheel is rotatably connected to the side of the pulley flange away from the motor flange through two fifth ball bearings, a second bearing spacer is arranged between the two fifth ball bearings, and the synchronous wheel shaft is rotatably connected to the side of the pulley flange close to the motor flange through a sixth ball bearing. The synchronous wheel shaft and the synchronous wheel are connected by a second flat key.

[0014] Preferably, the gear shaft is rotatably connected to the planetary bracket through a first ball bearing and a second ball bearing, the sun gear is arranged between the first ball bearing and the second ball bearing, the first ball bearing is located at an end of the sun gear close to the synchronous wheel, a first retaining spring is arranged between the first ball bearing and the sun gear, the high-speed wheel is arranged at an end of the first ball bearing close to the synchronous wheel, and a second retaining spring is arranged between the high-speed wheel and the first ball bearing.

[0015] Preferably, the high-speed wheel and the low-speed wheel are arranged at one end of the sun wheel close to the synchronous wheel.

[0016] Preferably, the gear shaft is also circumferentially provided with a third ball bearing for adapting to the inner cavity of the synchronous wheel shaft at one end close to the motor flange and a fourth ball bearing for adapting to the motor flange. The third ball bearing is arranged at the end of the gear shaft close to the synchronous wheel, and the fourth ball bearing is arranged at the end of the gear shaft close to the motor flange. A first bearing spacer is arranged between the fourth ball bearing and the second ball bearing.

[0017] Preferably, the first inner gear ring is fixed inside the housing by pins.

[0018] Preferably, the sliding gear sleeve is provided with a second inner gear ring for spline connection with the synchronous wheel shaft and a third inner gear ring for spline connection with the low-speed wheel or the high-speed wheel.

[0019] Preferably, the sum of the distance between the second inner gear ring and the third inner gear ring plus the height of the second inner gear ring and the third inner gear ring is greater than the sum of the distance between the high-speed wheel and the low-speed wheel plus the height of the high-speed wheel and the low-speed wheel, and the height of the third inner gear ring is less than the distance between the spline teeth of the high-speed wheel and the low-speed wheel.

[0020] Preferably, the diameter of the sliding gear sleeve is close to that of the planetary carrier.

[0021] Beneficial effects: Compared with the prior art, the utility model has the following advantages:

[0022] The motor flange, planetary gear train and output spindle are coaxially arranged, and a set of planetary gear trains are used for deceleration. The shift mechanism is coordinated to ensure a larger transmission ratio difference between high-speed gear and low-speed gear, meeting the needs of two different working conditions: low-speed high-torque and high-speed low-torque. The overall structure is compact, the number of parts is small, and the operation is simple.

[0023] The diameter of the sliding gear sleeve is close to that of the planetary bracket, and the space between the planetary bracket and the output main shaft is fully utilized to install the sliding gear sleeve, thereby fully utilizing the space of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is an exploded stereogram of the utility model;

[0025] Figure 2 It is an exploded stereogram of the output spindle of the utility model;

[0026] Figure 3 This is a stereoscopic diagram of the installation of the output spindle of the utility model;

[0027] Figure 4 It is an exploded stereogram of the shift mechanism of the utility model;

[0028] Figure 5 This is a three-dimensional installation diagram of the shift mechanism of the utility model;

[0029] Figure 6 It is an exploded stereogram of the first inner gear ring and the housing of the utility model;

[0030] Figure 7 This is a stereoscopic diagram of the installation of the first inner gear ring and the housing of the utility model;

[0031] Figure 8 It is an exploded stereogram of a part of the planetary gear train of the utility model;

[0032] Fig. 9 It is a partial installation stereogram of the planetary gear system of the utility model;

[0033] Fig.10 It is a three-dimensional diagram of the internal structure of a part of the planetary gear system of the utility model;

[0034] Description of reference numerals:

[0035] 11. Motor flange; 2. Shift mechanism; 21. Cylinder; 22. Shift fork; 23. Sliding gear sleeve; 231. Second inner gear ring; 232. Third inner gear ring; 3. Planetary gear train; 30. Gear shaft; 31. Sun gear; 32. Planetary gear; 33. First inner gear ring; 34. Planetary bracket; 35. Housing; 36. High-speed wheel; 37. Low-speed wheel; 38. Planetary shaft; 39. Needle bearing; 301. First ball bearing; 302. Second ball bearing; 303. First retaining spring; 304. Second retaining spring; 305. Third ball bearing; 306. Fourth ball bearing; 307. First bearing spacer; 308. Pin; 4. Output spindle; 41. Synchronous wheel; 42. Synchronous wheel shaft; 43. Pulley flange; 44. Fifth ball bearing; 45. Second bearing spacer; 47. Sixth ball bearing. DETAILED DESCRIPTION

[0036] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0037] Any feature disclosed in this specification (including any additional claims, abstract and drawings), unless otherwise stated, may be replaced by other alternative features that are equivalent or have similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0038] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings.

[0039] like Figure 1 As shown, a two-speed gearbox includes a motor flange 11 for mounting an electric motor, a shift mechanism 2, a planetary gear train 3 for realizing transmission and speed change, and an output main shaft 4; the motor flange 11, the planetary gear train 3, and the output main shaft 4 are coaxially arranged;

[0040] The planetary gear train 3 includes a gear shaft 30 drivingly connected to the motor, a sun gear 31 fixedly arranged on the gear shaft, a planetary gear 32 meshingly connected to the sun gear 31, a first inner gear ring 33 meshingly connected to the planetary gear 32, a planetary carrier 34 for mounting the planetary gears, a housing 35 fixedly connected to the first inner gear ring 33, a high-speed wheel 36 fixedly arranged on the gear shaft 30, and a low-speed wheel 37 fixedly arranged on the planetary carrier 34;

[0041] like Figure 4 and 5 As shown, the shift mechanism 2 includes a cylinder seat, a cylinder 21, a shift fork 22 drivingly connected to the cylinder, and a sliding gear sleeve 23 drivingly connected to the shift fork 22;

[0042] The output main shaft 4 includes a synchronous wheel 41 and a synchronous wheel shaft 42. The outer periphery of one end of the synchronous wheel shaft 42 close to the motor flange is provided with spline teeth spline-connected with the sliding gear sleeve 23.

[0043] One end of the sliding gear sleeve 23 is spline-connected to the synchronous wheel shaft 42, and the other end is spline-connected to the low-speed wheel 37 or the high-speed wheel 36 under the push of the shift fork.

[0044] The motor flange, planetary gear train and output spindle are coaxially arranged, and a set of planetary gear trains are used for deceleration. The shift mechanism is coordinated to ensure a larger transmission ratio difference between high-speed gear and low-speed gear, meeting the needs of two different working conditions: low-speed high-torque and high-speed low-torque. The overall structure is compact, the number of parts is small, and the operation is simple.

[0045] In this embodiment, the planetary gear train 3 also includes four mounting holes opened in the circumference of the planetary bracket 34, and the planetary shaft 38 is fixedly installed in the mounting hole. The planetary shaft 38 is sleeved with a needle bearing 39, and the planetary wheel 32 is rotatably set on the planetary shaft through the needle bearing 39.

[0046] like Figure 2 and 3 As shown, in this embodiment, the output main shaft also includes a pulley flange 43, a fifth ball bearing 44, a second bearing spacer 45, a second flat key 46 and a sixth ball bearing 47, the synchronous wheel 41 is rotatably connected to the side of the pulley flange 43 away from the motor flange through two fifth ball bearings 44, a second bearing spacer 45 is arranged between the two fifth ball bearings 44, the synchronous wheel shaft 42 is rotatably connected to the side of the pulley flange 43 close to the motor flange through a sixth ball bearing 47, and the synchronous wheel shaft 42 is connected to the synchronous wheel 41 through a second flat key 46.

[0047] like Figure 6-10 As shown, in this embodiment, the gear shaft 30 is rotatably connected to the planetary bracket 34 through the first ball bearing 301 and the second ball bearing 302, the sun gear is arranged between the first ball bearing 301 and the second ball bearing 302, the first ball bearing 301 is located at the end of the sun gear close to the synchronous wheel, a first retaining spring 303 is arranged between the first ball bearing 301 and the sun gear, the high-speed wheel is arranged at the end of the first ball bearing 301 close to the synchronous wheel, and a second retaining spring 304 is arranged between the high-speed wheel and the first ball bearing 301.

[0048] In this embodiment, the high-speed wheel and the low-speed wheel are arranged at one end of the sun wheel close to the synchronous wheel, so as to leave space between the planetary support and the output main shaft for installing the shift mechanism.

[0049] In this embodiment, the circumference of the gear shaft 30 is also provided with a third ball bearing 305 for adapting to the inner cavity of the end of the synchronous wheel shaft close to the motor flange and a fourth ball bearing 306 for adapting to the motor flange. The third ball bearing 305 is arranged at the end of the gear shaft 30 close to the synchronous wheel, and the fourth ball bearing 306 is arranged at the end of the gear shaft 30 close to the motor flange. A first bearing spacer 307 is arranged between the fourth ball bearing 306 and the second ball bearing 302.

[0050] In this embodiment, the first inner gear ring 33 is fixed inside the housing 35 by means of a pin 308 .

[0051] In this embodiment, the sliding gear sleeve 23 includes a second inner gear ring 231 for spline connection with the spline teeth of the synchronous wheel shaft 42 and a third inner gear ring 232 for spline connection with the low-speed wheel 37 or the high-speed wheel 36 .

[0052] It is understandable that the second inner gear ring 231 and the third inner gear ring 232 can also adopt an integrated structure, and the whole adopts a gear ring structure.

[0053] In this embodiment, the sum of the distance between the second inner gear ring 231 and the third inner gear ring 232 plus the height of the second inner gear ring 231 and the third inner gear ring 232 is greater than the sum of the distance between the high-speed wheel and the low-speed wheel plus the height of the high-speed wheel and the low-speed wheel, and the height of the third inner gear ring 232 is less than the distance between the spline teeth of the high-speed wheel and the low-speed wheel.

[0054] By adopting this structure, when the sliding gear sleeve 23 is moved to the synchronous wheel side driven by the shift fork, the sliding gear sleeve can be perfectly connected with the spline teeth on the high-speed wheel and the synchronous wheel shaft at the same time, and also when the sliding gear sleeve 23 is moved to the motor side, the sliding gear sleeve can be perfectly connected with the spline teeth on the low-speed wheel and the synchronous wheel shaft at the same time; during the movement, the third inner gear ring 232 can utilize the distance between the spline teeth of the high-speed wheel and the low-speed wheel to avoid the speed difference between the high-speed wheel and the low-speed wheel and connect smoothly.

[0055] In this embodiment, the diameter of the sliding gear sleeve is close to that of the planetary bracket, and the space between the planetary bracket and the output main shaft is fully utilized to install the sliding gear sleeve, thereby fully utilizing the space of the device.

[0056] Working principle: When it is necessary to shift to high gear: the cylinder is pushed out, and the shift fork drives the sliding gear sleeve to the side close to the synchronous wheel. At this time, the sliding gear sleeve is splined with the high-speed wheel installed on the gear shaft, and the sliding gear sleeve is combined with the synchronous wheel shaft at the same time, and the power is output through the synchronous wheel connected to the synchronous wheel shaft. At this time, the output end synchronous wheel speed = sun wheel / gear shaft = input speed.

[0057] When it is necessary to shift to a low gear: the cylinder retracts, and the shift fork drives the sliding sleeve to move closer to the motor flange. At this time, the sliding sleeve is combined with the low-speed wheel fixed on the bracket, and the sliding sleeve is also combined with the synchronous wheel shaft. At this time, the output end synchronous wheel speed = planetary bracket = input speed / speed ratio [(number of teeth on the first inner gear ring + number of teeth on the sun gear) / number of teeth on the sun gear].

[0058] The purpose of the above embodiments is to exemplarily reproduce and deduce the technical solution of the utility model, and to fully describe the technical solution, purpose and effect of the utility model. Its purpose is to make the public understand the disclosed content of the utility model more thoroughly and comprehensively, and it does not limit the protection scope of the utility model.

[0059] The above embodiments are not exhaustive enumerations based on the present invention, and there may be multiple other implementations not listed. Any replacement and improvement made without violating the concept of the present invention shall fall within the protection scope of the present invention.

Claims

1. A dual-speed gearbox, characterized in that: It comprises a motor flange (11) for mounting a motor, a shift mechanism (2), a planetary gear train (3) for achieving transmission and speed change, and an output main shaft (4); the motor flange (11), the planetary gear train (3), and the output main shaft (4) are coaxially arranged; The planetary gear train (3) comprises a gear shaft (30) connected to the motor in transmission, a sun gear (31) fixedly mounted on the gear shaft, a planetary gear (32) meshingly connected to the sun gear (31), a first inner gear ring (33) meshingly connected to the planetary gear (32), a planetary support (34) for mounting the planetary gear, a housing (35) fixedly connected to the first inner gear ring (33), a high-speed wheel (36) fixedly mounted on the gear shaft (30), and a low-speed wheel (37) fixedly mounted on the planetary support (34); The shift mechanism (2) comprises a cylinder seat, a cylinder (21), a shift fork (22) drivingly connected to the cylinder, and a sliding gear sleeve (23) drivingly connected to the shift fork (22); The output main shaft (4) comprises a synchronous wheel (41) and a synchronous wheel shaft (42); the outer periphery of one end of the synchronous wheel shaft (42) close to the motor flange is provided with spline teeth spline-connected to the sliding gear sleeve (23); One end of the sliding gear sleeve (23) is spline-connected to the synchronous wheel shaft (42), and the other end is spline-connected to the low-speed wheel (37) or the high-speed wheel (36) under the push of the shift fork.

2. A dual-speed gearbox according to claim 1, characterized in that: The planetary gear train (3) also includes four mounting holes opened in the circumference of the planetary bracket (34), a planetary shaft (38) is fixedly mounted in the mounting hole, a needle bearing (39) is sleeved on the planetary shaft (38), and the planetary gear (32) is rotatably arranged on the planetary shaft via the needle bearing (39).

3. A dual-speed gearbox according to claim 1, characterized in that: The output main shaft also includes a pulley flange (43), a fifth ball bearing (44), a second bearing spacer (45), a second flat key (46) and a sixth ball bearing (47); the synchronous wheel is a double synchronous wheel; the synchronous wheel (41) is rotatably connected to a side of the pulley flange (43) away from the motor flange through two fifth ball bearings (44); a second bearing spacer (45) is arranged between the two fifth ball bearings (44); the synchronous wheel shaft (42) is rotatably connected to a side of the pulley flange (43) close to the motor flange through a sixth ball bearing (47); and the synchronous wheel shaft (42) and the synchronous wheel (41) are connected through a second flat key.

4. A dual-speed gearbox according to claim 1, characterized in that: The gear shaft (30) is rotatably connected to the planetary support (34) via a first ball bearing (301) and a second ball bearing (302); the sun gear is arranged between the first ball bearing (301) and the second ball bearing (302); the first ball bearing (301) is located at one end of the sun gear close to the synchronous gear; a first retaining spring (303) is arranged between the first ball bearing (301) and the sun gear; the high-speed wheel is arranged at one end of the first ball bearing (301) close to the synchronous gear; and a second retaining spring (304) is arranged between the high-speed wheel and the first ball bearing (301).

5. A dual-speed gearbox according to claim 1 or 4, characterized in that: The high-speed wheel and the low-speed wheel are arranged at one end of the sun wheel close to the synchronous wheel.

6. A dual-speed gearbox according to claim 5, characterized in that: The gear shaft (30) is also provided with a third ball bearing (305) adapted to the inner cavity of one end of the synchronous wheel shaft close to the motor flange and a fourth ball bearing (306) adapted to the motor flange in the circumferential direction. The third ball bearing is arranged at one end of the gear shaft (30) close to the synchronous wheel, and the fourth ball bearing (306) is arranged at one end of the gear shaft (30) close to the motor flange. A first bearing spacer (307) is arranged between the fourth ball bearing (306) and the second ball bearing (302).

7. A dual-speed gearbox according to claim 1, characterized in that: The first inner gear ring (33) is fixedly arranged inside the housing (35) via a pin (308).

8. A dual-speed gearbox according to claim 1, characterized in that: The inner side of the sliding gear sleeve (23) is provided with a second inner gear ring (231) for spline connection with the synchronous wheel shaft (42) and a third inner gear ring (232) for spline connection with the low-speed wheel (37) or the high-speed wheel (36).

9. A dual-speed gearbox according to claim 8, characterized in that: The sum of the distance between the second inner gear ring (231) and the third inner gear ring (232) plus the height of the second inner gear ring (231) and the third inner gear ring (232) is greater than the sum of the distance between the high-speed wheel and the low-speed wheel plus the height of the high-speed wheel and the low-speed wheel, and the height of the third inner gear ring (232) is less than the distance between the spline teeth of the high-speed wheel and the low-speed wheel.

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