Speed reduction transmission mechanism

Abstract

The utility model provides a speed reduction transmission mechanism which comprises a first rotating shaft, a shaft barrel and a P1 planet row, the P1 planet row comprises a P1 sun gear, a P1 planet gear and a P1 gear ring, the P1 planet gear is meshed between the P1 sun gear and the P1 gear ring, one end of the shaft barrel is open, the other opposite end of the shaft barrel is closed, one end of the first rotating shaft is connected with the P1 sun gear through a spline pair, and the other end of the first rotating shaft is connected with the P1 gear ring through a spline pair. The other end of the first rotating shaft is connected with the open end of the shaft barrel through a spline pair, an elastic piece is further arranged in the shaft barrel, one end of the elastic piece abuts against the closed end of the shaft barrel, and the other end of the elastic piece abuts against the first rotating shaft. By the adoption of the technical scheme, when axial force is applied to the first rotating shaft, the elastic piece is compressed, the first rotating shaft and the P1 sun gear are separated from each other, a power transmission path is cut off, compared with the prior art, the power transmission path is cut off, the corresponding speed is high, abrasion of all parts is small, and application to the electric forklift is facilitated; and the maintenance frequency is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of transmission mechanisms, in particular to a reduction transmission mechanism. Background Art

[0002] At present, speed change mechanisms are widely used in various vehicles and machine tools. Speed ​​change mechanisms are important components of these mechanical equipment. With the development of technology, the existing speed change mechanisms have more and more speed gears. However, with the continuous increase in the number of gears, the number of internal components of the speed change mechanism will inevitably increase, making the structure of the speed change mechanism increasingly complex, larger and heavier, and people's requirements for the control flexibility of construction machinery such as forklifts, cranes, and bulldozers are also getting higher and higher, and correspondingly, the requirements for the number of gears are also increasing.

[0003] In the prior art, the publication number is: "A transmission mechanism with multiple reverse gears of the step-down type, comprising an input shaft, a front output shaft, a rear output shaft, an intermediate shaft, a P1 planetary gear, a P2 planetary gear, a P3 planetary gear and a P4 planetary gear. The P1 planetary gear sun gear, the P2 planetary gear sun gear and the P3 planetary gear sun gear are connected in parallel to the input shaft, the P1 planetary gear carrier is connected to the P2 planetary gear ring through a spline, the P2 planetary gear carrier, the P4 planetary gear sun gear and the P3 planetary gear ring are connected through splines respectively, the P3 planetary gear carrier is also connected in parallel to the P4 planetary gear ring and then connected to one end of the intermediate shaft, the other end of the intermediate shaft is sequentially meshed with multiple gears in series, and the front output shaft and the rear output shaft are respectively connected to the last gear. The technical solution provided by the patent document enables the speed change mechanism to have multiple reverse gears, and the internal gear is used as much as possible in the speed change mechanism. The meshing gear transmission structure reduces the size of the transmission mechanism to a certain extent. However, for some special vehicles that perform special tasks, such as electric forklifts, which are generally driven by motors, the actuator is required to move at a low speed when the electric forklift is running, which requires the electric forklift to be equipped with a reduction mechanism with a large transmission ratio. In addition, the actuator is also required to be able to start and stop frequently when the electric forklift is running. If the motor is started and stopped frequently, it is easy to cause damage to the motor. The existing clutch mechanism generally includes a friction plate and a hydraulic cylinder. The hydraulic cylinder controls the friction plate to press against the surface of the output wheel or separates the friction plate from the output wheel to realize the start and stop of the reduction mechanism. However, the existing clutch mechanism is often large in shape and size, which is not convenient for installation on electric forklifts, and the friction plate is worn out, and it is often necessary to replace and maintain the friction plate regularly. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a reduction transmission mechanism.

[0005] The utility model is realized through the following technical solutions.

[0006] The utility model provides a reduction transmission mechanism, including a first rotating shaft, a shaft cylinder and a P1 planetary row, the P1 planetary row including a P1 sun gear, a P1 planetary gear and a P1 ring gear, the P1 planetary gear meshing between the P1 sun gear and the P1 ring gear, one end of the shaft cylinder is open and the other end is closed, one end of the first rotating shaft is connected to the P1 sun gear by a spline pair, the other end of the first rotating shaft is connected to the open end of the shaft cylinder by a spline pair, an elastic member is also provided in the shaft cylinder, one end of the elastic member abuts against the closed end of the shaft cylinder, and the other end of the elastic member abuts against the first rotating shaft.

[0007] The elastic member is a cylindrical helical compression spring.

[0008] The closed end of the shaft cylinder is also fixedly connected to one end of the second rotating shaft, and the other end of the second rotating shaft extends outward.

[0009] The second rotating shaft and the shaft cylinder are integrally manufactured.

[0010] The P1 planetary gear set also includes a P1 planet carrier, which connects all the P1 planetary gears together.

[0011] The reduction transmission mechanism also includes a P2 planetary gear, which includes a P2 sun gear, a P2 planetary gear and a P2 ring gear. The P2 planetary gear is meshed between the P2 sun gear and the P2 ring gear, and the P2 sun gear is connected to the P1 planet carrier by a spline pair.

[0012] The P2 planetary gear set also includes a P2 planet carrier, which connects all the P2 planetary gears together.

[0013] The reduction transmission mechanism also includes a P3 planetary gear, which includes a P3 sun gear, a P3 planetary gear and a P3 ring gear. The P3 planetary gear is meshed between the P3 sun gear and the P3 ring gear. The P3 sun gear is connected to the P2 planet carrier by a spline pair.

[0014] The P3 planetary gear set also includes a P3 planet carrier, which connects all the P3 planetary gears together.

[0015] The beneficial effect of the utility model is that: by adopting the technical scheme of the utility model, the first rotating shaft is used as the power input end, and the power from the output shaft of the motor is transmitted to the P1 ring gear output through the P1 planetary gear set. Since the transmission ratio of the planetary gear transmission mechanism is relatively large, a larger transmission ratio can be obtained, so that the actuator of the electric forklift can move at a low speed. When an axial force is applied to the first rotating shaft, the elastic member is compressed, so that the first rotating shaft and the P1 sun gear are disengaged from each other, thereby cutting off the power transmission path. Compared with the prior art, the utility model has a fast cutting response speed at the moment of cutting off the power transmission path, and the wear of each component is small. The shape and size of the clutch mechanism are small, which is convenient for installation on the electric forklift and reduces the frequency of maintenance of the first rotating shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model.

[0017] In the figure: 1-first rotating shaft, 2-shaft cylinder, 3-P1 sun gear, 4-P1 planetary gear, 5-P1 ring gear, 6-elastic member, 7-second rotating shaft, 8-P1 planetary carrier, 9-P2 sun gear, 10-P2 planetary gear, 11-P2 ring gear, 12-P2 planetary carrier, 13-P3 sun gear, 14-P3 planetary gear, 15-P3 ring gear, 16-P3 planetary carrier. DETAILED DESCRIPTION

[0018] The technical solution of the utility model is further described below, but the scope of protection required is not limited to the description.

[0019] like Figure 1 As shown, the utility model provides a reduction transmission mechanism, including a first rotating shaft 1, a shaft cylinder 2 and a P1 planetary gear, the P1 planetary gear includes a P1 sun gear 3, a P1 planetary gear 4 and a P1 ring gear 5, the P1 planetary gear 4 is meshed between the P1 sun gear 3 and the P1 ring gear 5, one end of the shaft cylinder 2 is open and the other end is closed, one end of the first rotating shaft 1 is connected to the P1 sun gear 3 by a spline pair, the other end of the first rotating shaft 1 is connected to the open end of the shaft cylinder 2 by a spline pair, an elastic member 6 is further provided in the shaft cylinder 2, one end of the elastic member 6 abuts against the closed end of the shaft cylinder 2, and the other end of the elastic member 6 abuts against the first rotating shaft 1.

[0020] By adopting the technical solution of the utility model, the first rotating shaft serves as the power input end, and the power from the output shaft of the motor is transmitted to the P1 ring gear output through the P1 planetary gear set. Since the transmission ratio of the planetary gear transmission mechanism is relatively large, a larger transmission ratio can be obtained, so that the actuator of the electric forklift can move at a low speed. When an axial force is applied to the first rotating shaft, the elastic member is compressed, so that the first rotating shaft and the P1 sun gear are disengaged from each other, thereby cutting off the power transmission path. Compared with the prior art, the utility model has a fast cutting response speed at the moment of cutting off the power transmission path, and reduces the wear of various components. In addition, the shape and size of the clutch mechanism are small, which is convenient for installation on the electric forklift, and reduces the frequency of maintenance of the first rotating shaft.

[0021] Specifically, the elastic member 6 is preferably a cylindrical helical compression spring. The closed end of the shaft cylinder 2 is also fixedly connected to one end of the second rotating shaft 7, and the other end of the second rotating shaft 7 extends outward. The second rotating shaft 7 and the shaft cylinder 2 are integrally manufactured.

[0022] In addition, the P1 planetary gear set also includes a P1 planetary carrier 8, which connects all the P1 planetary gears 4 together. The reduction transmission mechanism also includes a P2 planetary gear set, which includes a P2 sun gear 9, a P2 planetary gear 10 and a P2 ring gear 11. The P2 planetary gear 10 is meshed between the P2 sun gear 9 and the P2 ring gear 11, and the P2 sun gear 9 and the P1 planetary carrier 8 are connected by a spline pair. The P2 planetary gear set also includes a P2 planetary carrier 12, which connects all the P2 planetary gears 10 together.

[0023] In addition, the reduction transmission mechanism further includes a P3 planetary row, which includes a P3 sun gear 13, a P3 planetary gear 14 and a P3 ring gear 15. The P3 planetary gear 14 is meshed between the P3 sun gear 13 and the P3 ring gear 15, and a spline pair is used to connect the P3 sun gear 13 and the P2 planet carrier 12. The P3 planetary row also includes a P3 planet carrier 16, which connects all the P3 planetary gears 14 together.

[0024] By adopting the technical solution of the utility model, the overall transmission ratio of the reduction mechanism is increased by cascading the P1 planetary gear, the P2 planetary gear and the P3 planetary gear in sequence. When it is applied to an electric forklift, the electric forklift actuator can run smoothly at a low speed. Specifically, the maximum transmission ratio of the utility model can reach more than 1:120. When the power of the electric motor is input from the first rotating shaft or the second rotating shaft, the P1 sun gear is driven to rotate, and the P1 sun gear drives the P1 planetary gear to rotate, thereby driving the P1 planetary carrier to rotate. Since the P1 planetary carrier and the P2 sun gear are connected as a whole, the P2 sun gear rotates with the P1 planetary carrier, the P2 sun gear drives the P2 planetary gear to rotate, and drives the P2 planetary carrier to rotate. Since the P2 planetary carrier and the P3 sun gear are connected as a whole, the P3 sun gear rotates with the P2 planetary carrier, and the P3 sun gear drives the P3 planetary gear to rotate. Since the P3 planetary carrier is fixed, the P3 planetary gear drives the P1 ring gear to rotate, and the power is finally output through the P1 ring gear.

Claims

1. A reduction transmission mechanism, characterized in that: The invention comprises a first rotating shaft (1), a shaft cylinder (2) and a P1 planetary gear, wherein the P1 planetary gear comprises a P1 sun gear (3), a P1 planetary gear (4) and a P1 ring gear (5), wherein the P1 planetary gear (4) is meshed between the P1 sun gear (3) and the P1 ring gear (5), wherein one end of the shaft cylinder (2) is open and the other end is closed, wherein one end of the first rotating shaft (1) is connected to the P1 sun gear (3) by a spline pair, and the other end of the first rotating shaft (1) is connected to the open end of the shaft cylinder (2) by a spline pair, and an elastic member (6) is further provided in the shaft cylinder (2), wherein one end of the elastic member (6) abuts against the closed end of the shaft cylinder (2), and the other end of the elastic member (6) abuts against the first rotating shaft (1).

2. The reduction transmission mechanism according to claim 1, characterized in that: The elastic member (6) is a cylindrical helical compression spring.

3. The reduction transmission mechanism according to claim 1, characterized in that: The closed end of the shaft cylinder (2) is also fixedly connected to one end of the second rotating shaft (7), and the other end of the second rotating shaft (7) extends outward.

4. The reduction transmission mechanism according to claim 3, characterized in that: The second rotating shaft (7) and the shaft cylinder (2) are integrally manufactured.

5. The reduction transmission mechanism according to claim 1, characterized in that: The P1 planetary gear train further comprises a P1 planet carrier (8), and the P1 planet carrier (8) connects all the P1 planetary gears (4) together.

6. The reduction transmission mechanism according to claim 5, characterized in that: The reduction transmission mechanism also includes a P2 planetary gear, which includes a P2 sun gear (9), a P2 planetary gear (10) and a P2 ring gear (11). The P2 planetary gear (10) is meshed between the P2 sun gear (9) and the P2 ring gear (11), and the P2 sun gear (9) is connected to the P1 planet carrier (8) by a spline pair.

7. The reduction transmission mechanism according to claim 6, characterized in that: The P2 planetary gear train also includes a P2 planet carrier (12), which connects all the P2 planetary gears (10) together.

8. The reduction transmission mechanism according to claim 7, characterized in that: The reduction transmission mechanism also includes a P3 planetary gear, which includes a P3 sun gear (13), a P3 planetary gear (14) and a P3 ring gear (15). The P3 planetary gear (14) is meshed between the P3 sun gear (13) and the P3 ring gear (15), and the P3 sun gear (13) and the P2 planet carrier (12) are connected by a spline pair.

9. The reduction transmission mechanism according to claim 8, characterized in that: The P3 planetary gear set also includes a P3 planet carrier (16), which connects all the P3 planetary gears (14) together.

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