Compact structure small torque walking speed reducer

Abstract

The utility model relates to a small torque walking speed reducer of compact structure, including support axle, machine body, input shaft, round nut and multistage planetary gear system, support axle rotates through bearing and is arranged in the machine body, and the bearing outer ring of inside is fixed by round nut spacing, and input shaft connects multistage planetary gear system, and the last stage planet carrier spline connects support axle, the inner end part of support axle is equipped with outer spline, the retreating tool groove of round nut side near the outer spline of support axle is equipped with the baffle ring, and the baffle ring is fixedly connected with the last stage planet carrier, and the brake is set up on input shaft, and the last stage planet carrier is emptyed brake mounting space, and the brake one part sets up in support axle, and the brake another part sets up in the last stage planet carrier, the utility model discloses through baffle ring front -positioning, and support axle no longer needs to pass through the last stage planet carrier, and makes the last stage planet carrier emptyed brake mounting space, makes the gear box length short, and height is low, and compact structure satisfies the design requirement of high -output torque of gear box.

Description

Technical Field

[0001] This utility model relates to the field of gearbox technology, specifically to a compact, low-torque travel reducer. Background Technology

[0002] Travel reducers are planetary gear drive mechanisms commonly used in wheeled or tracked machinery. They typically employ multi-planetary gear transmission and are ideal for the travel drive of aerial work platforms, tracked cranes, and other construction machinery. To improve safety, a brake is usually installed on the input shaft. Existing travel reducers with brakes include... Figure 1 As shown, the support shaft 1 has an installation space, the brake 4 is installed inside the support shaft 1, and the round nut 7 locks the support shaft 1 and the bearing 6. The final stage planetary carrier 8 and the support shaft 1 transmit torque through a spline. The end of the support shaft 1 with an external spline passes through the final stage planetary carrier 8 and is fixed by a shaft retaining ring 11. However, this structure is suitable for an output torque of 110,000 Nm. For a torque gearbox with an output torque of 60,000 Nm, due to the limited space, the size of the support shaft becomes smaller, making this structure unsuitable. Therefore, there is an urgent need to design a compact, low-torque travel reducer. Utility Model Content

[0003] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a compact low-torque travel reducer. By placing the retaining ring in the front, the support shaft no longer needs to pass through the final stage planetary carrier, freeing up space for brake installation inside the final stage planetary carrier. This results in a short gearbox length, low height, and compact structure, meeting the design requirements for high output torque of the gearbox.

[0004] The purpose of this utility model is achieved as follows: A compact, low-torque travel reducer includes a support shaft, a housing, an input shaft, a round nut, and a multi-stage planetary gear train. The support shaft is rotatably mounted in the housing via bearings, and the outer ring of the inner bearing is fixed by the round nut. The input shaft is connected to the multi-stage planetary gear train, and the last-stage planetary carrier is splined to the support shaft. The inner end of the support shaft is provided with an external spline, and a retaining ring is provided in the relief groove of the external spline near the round nut. The retaining ring is fixedly connected to the last-stage planetary carrier. A brake is mounted on the input shaft, and space for the brake is provided in the last-stage planetary carrier. Part of the brake is located in the support shaft, and the other part of the brake is located in the last-stage planetary carrier.

[0005] Preferably, the retaining ring has a second internal spline on the outer spline corresponding to the support shaft. The second internal spline of the retaining ring slides from the inner end of the support shaft into the relief groove along the outer spline. The teeth of the second internal spline and the outer spline are misaligned. The retaining ring after the teeth are misaligned is locked to the final planetary carrier by bolts.

[0006] Preferably, the retaining ring is a split type, comprising two semi-circular baffles. The two semi-circular baffles are inserted into the tool relief groove to form an annular whole. The split retaining ring inserted into the tool relief groove is locked to the final stage planetary carrier by bolts.

[0007] Preferably, the inner and outer sides of the brake are fixed by retaining rings, which are respectively mounted on the support shaft and the final stage planetary carrier.

[0008] Preferably, the last stage planetary carrier has a positioning stop corresponding to the retaining ring to ensure that the retaining ring is concentric with the last stage planetary carrier.

[0009] Preferably, multiple bolts are evenly distributed in the circumferential direction of the final planetary carrier.

[0010] Preferably, the inner end face of the last-stage planetary carrier has a countersunk hole corresponding to the bolt, and the bolt is screwed into the retaining ring from the inner end face of the last-stage planetary carrier. The retaining ring has a bolt hole corresponding to the bolt.

[0011] The beneficial effects of this utility model are: By placing the retaining ring at the front, the support shaft no longer needs to pass through the final stage planetary carrier, freeing up space inside the final stage planetary carrier for brake installation. This results in a shorter gearbox length, lower height, and a compact structure, meeting the design requirements for high output torque in the gearbox. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of a travel reducer in the prior art.

[0013] Figure 2 This is a structural schematic diagram of a compact, low-torque travel reducer according to the present invention.

[0014] Figure 3 for Figure 2 A magnified view of a portion of the image.

[0015] Figure 4 This is the front view of the retaining ring in Example 1.

[0016] Figure 5 This is the front view of the retaining ring in Example 2.

[0017] in: Support shaft 1; external spline 1.1; relief groove 1.2; machine body 2; input shaft 3; brake 4; retaining ring 5; second internal spline 5.1; semi-circular baffle 5.2; bearing 6; round nut 7; final stage planetary carrier 8; snap ring 9; bolt 10; shaft retaining ring 11. Detailed Implementation Example 1

[0018] See Figure 2-4This utility model relates to a compact, low-torque travel reducer, comprising a support shaft 1, a body 2, an input shaft 3, a brake 4, a retaining ring 5, and a multi-stage planetary gear train. The support shaft 1 is rotatably mounted inside the body 2 via bearings 6. Two bearings 6 are provided, one inside and one outside. The outer ring of the inner bearing 6 is fixed by a round nut 7. The brake 4 is mounted on the input shaft. The input shaft 3 is connected to the multi-stage planetary gear train. The final stage planetary carrier 8 is splined to the support shaft 1. The inner end of the support shaft 1 is provided with an external spline 1.1. The final stage planetary carrier 8 is provided with a first internal spline that matches the external spline 1.1. The external spline 1.1 of the support shaft 1 is provided with a relief groove 1.2 near the round nut. The retaining ring 5 is inserted into the relief groove 1.2 and fixedly connected to the final stage planetary carrier 8 to prevent axial movement of the support shaft 1 and the final stage planetary carrier 8 during operation.

[0019] The retaining ring 5 has a second internal spline 5.1 corresponding to the outer spline 1.1 of the support shaft 1. The outer spline 1.1 of the support shaft 1 is adapted to the second internal spline 5.1. The second internal spline 5.1 of the retaining ring 5 slides from the inner end of the support shaft 1 along the outer spline 1.1 into the relief groove 1.2. After rotating a certain angle, the teeth of the second internal spline 5.1 and the outer spline 1.1 are misaligned. The retaining ring 5 after the teeth are misaligned is locked to the final planetary carrier 8 by bolts 10. The tooth misalignment makes the retaining ring 5 stuck in the relief groove 1.2, and the final planetary carrier 8, which is fixedly connected to the retaining ring 5, is axially limited.

[0020] The retaining ring 5, which serves as a limit, is located on the outer end face of the last stage planetary carrier 8. The support shaft 1 no longer needs to pass through the last stage planetary carrier 8, thus freeing up space for the brake installation inside the last stage planetary carrier 8. The part of the brake 4 with the piston is located inside the support shaft 1, and the part of the brake 4 with the friction plate is located inside the last stage planetary carrier 8. The inner and outer sides of the brake 4 are fixed by retaining rings 9, which are respectively located on the support shaft 1 and the last stage planetary carrier 8.

[0021] The last stage planetary carrier 8 has a positioning stop corresponding to the retaining ring 5 to ensure that the retaining ring 5 and the last stage planetary carrier 8 are concentric.

[0022] Five bolts 10 are provided, and the five bolts are evenly distributed around the circumference. The inner end face of the last-stage planetary carrier 8 has a countersunk hole corresponding to the bolt. The bolt 10 is screwed into the retaining ring 5 from the inner end face of the last-stage planetary carrier. The retaining ring 5 has a bolt hole corresponding to the bolt.

[0023] By placing the retaining ring 5 in front, space is freed up inside the final stage planetary carrier 8 to install the brake, resulting in a shorter gearbox length, lower height, and a compact structure, which meets the design requirements for high output torque of the gearbox. Example 2

[0024] See Figure 5The retaining ring 5 is a split type, including two semi-circular baffles 5.2. The two semi-circular baffles 5.2 are inserted into the tool relief groove 1.2 to form an annular whole. The split retaining ring 5 inserted into the tool relief groove 1.2 is locked to the last stage planetary carrier 8 by bolts 10. The retaining ring 5 is stuck in the tool relief groove 1.2, and the last stage planetary carrier 8, which is fixedly connected to the retaining ring 5, is axially limited. The rest of the structure of Embodiment 2 is the same as that of Embodiment 1.

[0025] In addition to the above embodiments, this utility model also includes other implementation methods. All technical solutions formed by equivalent transformation or equivalent substitution should fall within the protection scope of the claims of this utility model.

Claims

1. A compact, low-torque travel reducer, comprising a support shaft, a housing, an input shaft, a round nut, and a multi-stage planetary gear train, wherein the support shaft is rotatably mounted within the housing via bearings, the outer ring of the inner bearing is fixed by a round nut, the input shaft is connected to the multi-stage planetary gear train, and the final planetary carrier is splinedly connected to the support shaft, characterized in that: The inner end of the support shaft is provided with an external spline. A retaining ring is provided in the tool relief groove of the external spline of the support shaft near the round nut. The retaining ring is fixedly connected to the last stage planetary carrier. The brake is set on the input shaft. The last stage planetary carrier has space for brake installation. Part of the brake is set in the support shaft, and the other part of the brake is set in the last stage planetary carrier.

2. The compact, low-torque travel reducer according to claim 1, characterized in that: The retaining ring has a second internal spline on the outer spline corresponding to the support shaft. The second internal spline of the retaining ring slides from the inner end of the support shaft into the relief groove along the outer spline. The teeth of the second internal spline and the outer spline are misaligned. The retaining ring after the teeth are misaligned is locked to the final planetary carrier by bolts.

3. The compact, low-torque travel reducer according to claim 1, characterized in that: The retaining ring is a split type, including two semi-circular baffles. After the two semi-circular baffles are inserted into the tool relief groove, they form an annular whole. The split retaining ring inserted into the tool relief groove is locked to the final stage planetary carrier by bolts.

4. The compact, low-torque travel reducer according to claim 1, characterized in that: The brake is fixed to the inner and outer sides by retaining rings, which are respectively installed on the support shaft and the final stage planetary carrier.

5. A compact, low-torque travel reducer according to claim 2 or 3, characterized in that: The last stage planetary carrier has a positioning stop corresponding to the retaining ring to ensure that the retaining ring is concentric with the last stage planetary carrier.

6. A compact, low-torque travel reducer according to claim 2 or 3, characterized in that: Multiple bolts are evenly distributed around the circumference of the final planetary carrier.

7. A compact, low-torque travel reducer according to claim 6, characterized in that: The inner end face of the last-stage planetary carrier has a countersunk hole corresponding to the bolt. The bolt is screwed into the retaining ring from the inner end face of the last-stage planetary carrier. The retaining ring has a bolt hole corresponding to the bolt.

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