CN115264002A

CN115264002A - Built-in speed reducer

Info

Publication number: CN115264002A
Application number: CN202210848204.5A
Authority: CN
Inventors: 程华; 唐鸿钧; 肖开波; 周渝; 周维; 杨泓; 王虹
Original assignee: Chengdu Jiuhe Construction Equipment Co ltd
Current assignee: Chengdu Jiuhe Construction Equipment Co ltd
Priority date: 2022-07-19
Filing date: 2022-07-19
Publication date: 2022-11-01

Abstract

The invention discloses a built-in speed reducer which comprises two stages of transmission mechanisms, wherein the first stage of transmission mechanism is NGW type planetary transmission, the second stage of transmission mechanism is ordinary gear train transmission similar to the NGW structure form, the first stage of transmission mechanism comprises a first stage sun gear, a first stage planet gear and a first stage inner gear ring, the second stage of transmission mechanism comprises a second stage sun gear, a second stage planet gear and a second stage inner gear ring, the first stage inner gear ring and the second stage inner gear ring are hinged together through a second box body, the speed reducer is further provided with an input spline housing, an external motor spline is connected with a left end spline of the input spline housing, a right end spline of the spline housing is connected with the first stage sun gear of the first stage transmission mechanism, the first stage transmission mechanism transmits power to the second stage transmission mechanism, the resultant force of the second stage transmission mechanism and the first stage transmission mechanism transmits the power to the box body, the power is output through the rotation of the box body, the abrasion of parts is reduced, the service life of a machine is prolonged, the size of an oil seal is changed, and the reliability of the oil seal is improved.

Description

Built-in speed reducer

Technical Field

The invention relates to the field of speed reducers, in particular to an internal speed reducer.

Background

With the continuous development of the tower crane industry, the demand of customers on a built-in linear lifting mechanism is continuously increased. At present, a built-in linear lifting mechanism is mainly characterized in that a planetary reducer is arranged in a winding drum to convert high-rotation-speed low-torque power at a motor end into low-rotation-speed high-torque power suitable for actual working condition requirements.

In consideration of the use environment and location of the speed reducer, trouble handling of the speed reducer is troublesome, and therefore a speed reducer with high reliability and high cost performance is required.

At present, in a planet speed reducer used in a mechanism at home, an output-stage planet carrier is fixedly connected to a mounting seat, the stress condition of the planet carrier is complex, the requirement on the manufacturing process is high, an inner bearing of the speed reducer and a bearing on a winding drum are matched to form over-positioning, and the inner bearing of the speed reducer bears larger additional load.

At present, a speed reducer with high reliability and high cost performance is needed to be provided.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the present invention provides the following built-in speed reducer

In order to achieve the purpose, the invention provides an internal reduction gear which comprises two stages of transmission mechanisms, wherein the first stage is NGW type planetary transmission, the second stage is fixed-axis gear train transmission similar to NGW structure form, the first stage transmission comprises a first stage sun gear, a first stage planet gear and a first stage inner gear ring, the second stage transmission comprises a second stage sun gear, a second stage planet gear and a second stage inner gear ring, the first stage inner gear ring and the second stage inner gear ring are hinged together through a second box body, the reduction gear is further provided with an input spline housing, an external motor spline is connected with a left end spline of the input spline housing, a right end spline of the spline housing is connected with the first stage sun gear of the first stage transmission mechanism, the first stage transmission mechanism transmits power to the second transmission mechanism, the second transmission mechanism and the first transmission mechanism jointly transmit power to the box body, and the power is output through the rotation of the box body. (ii) a

Furthermore, the first-stage sun gear and the first-stage planet gear are meshed through a gear to transmit motion to the first-stage planet carrier and the first-stage inner gear ring respectively;

furthermore, the first-stage sun gear rotates around the axis of the first-stage sun gear, the first-stage planet carrier rotates around the axis of the first-stage planet gear, the first-stage planet gear revolves around the axis of the planet carrier besides rotating around the axis of the first-stage planet gear, and the first-stage inner gear ring also rotates around the axis of the first-stage inner gear ring;

furthermore, the second-stage transmission mechanism also comprises a tooth-shaped spline, the second-stage sun gear and the first-stage planet carrier are hinged together through the tooth-shaped spline, the motion is transmitted to the second-stage planet gear, and the second-stage planet gear transmits the motion to the second-stage inner gear ring;

furthermore, a second-stage planet carrier of the second-stage transmission mechanism is connected with an output spline through a first spline, the left end of the output spline is connected with an output shaft bearing seat through a second spline, the output shaft bearing seat is fixedly connected to the frame, and the second-stage inner gear ring rotates under the condition that the second-stage planet carrier is always in a static state in work;

furthermore, the first-stage planet carrier is a single-row planet carrier, the second-stage planet carrier is a double-row planet carrier, and the second-stage planet carrier is arranged on the box body through a bearing;

furthermore, a closing structure is arranged at the left end of the box body;

further, an oil seal position is arranged on the first box body according to the minimum bearing position journal size. (ii) a

By adopting the scheme, the built-in speed reducer disclosed by the invention has the following technical effects:

1. the speed reducer designed by the invention has the advantages that the types of loaded loads of main force transmission parts are clear and simple, the spline sleeve is only subjected to torque and no bending moment load, and a dangerous section of the box body fixedly connected with the winding drum is only subjected to bending moment transmitted by the steel wire rope and has no torque, so that the abrasion of parts is reduced, and the service life of the machine is prolonged.

2. The oil blanket size reduces, and lip relative speed is lower, and is close to self-aligning roller bearing, and the box takes place the axis slope and to the oil blanket influence less, has increased the reliability of oil blanket.

3. The output bearing is limited in size and structure size rather than loaded size, and a closing-in structure is adopted, so that the size of the bearing is effectively reduced, and the manufacturing cost is reduced.

4. If the whole speed reducer is regarded as a left part and a right part, the right part is mainly a precise gear piece, the meshing of gears is greatly influenced by the parallelism between the axial leads of the gears in gear transmission, and the speed reducer structure can avoid gear unbalance loading and early grinding caused by external factors because the self-aligning roller bearing has strong self-aligning capability and the left part and the right part allow certain inclination. And the output bearing has inevitable wear, but the influence of this condition is not transmitted to the meshing portion of the gears.

5. The second-stage planet carrier is separated independently, so that the manufacturing difficulty of parts is effectively reduced, and the manufacturing cost is saved.

The conception, specific structure, and technical effects of the present invention will be further described in conjunction with the accompanying drawings and specific embodiments, so that the objects, features, and effects of the present invention can be fully understood.

Drawings

FIG. 1 is a schematic structural diagram of an internal speed reducer according to the present invention;

fig. 2 is a schematic diagram of the invention principle of the built-in speed reducer of the invention.

In the figure, 1, inputting the spline housing; 2. an output spline housing; 3. a self-aligning roller bearing; 4. an output bearing seat; 5. a lip-shaped seal ring; 6. a first box body; 7. a secondary planet carrier; 8. a second-stage annular gear; 9. a first-stage annular gear; 10. a first stage planet carrier; 11. a first-stage planet wheel; 12. a first stage sun gear; 13. a second stage sun gear.

Detailed Description

The preferred embodiments of the present invention will be described below with reference to the accompanying drawings for clarity and understanding of technical contents. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.

In the drawings, structurally identical elements are represented by like reference numerals, and structurally or functionally similar elements are represented by like reference numerals throughout the several views. The size and thickness of each component shown in the drawings are arbitrarily illustrated, and the present invention is not limited to the size and thickness of each component. The thickness of the components may be exaggerated where appropriate in the figures to improve clarity.

The invention provides an internal reduction gear which is composed of two stages of transmission, wherein the first stage is NGW type planetary transmission, the second stage is ordinary gear train transmission similar to NGW structure form (because the second stage planet carrier 7 is fixed and the inner gear ring rotates), the first stage inner gear ring 9 and the second stage inner gear ring 8 are hinged together through a box body.

Further, the speed reducer motion transmission route is as follows: the speed reducer is provided with an input spline housing 1, an external motor spline is connected with a left end spline of the input spline housing 1, a right end spline of the spline housing 1 is connected with a first-stage sun gear 12 spline, and the first-stage sun gear 12 and a first-stage planet gear 11 are engaged through gears to transfer motion to a first-stage planet carrier 10 and a first-stage inner gear ring 9 respectively. In the first-stage transmission, the sun gear rotates around the axis of the sun gear, the planet carrier rotates around the axis of the planet carrier, the planet gear revolves around the axis of the planet carrier at the same time except for rotating around the axis of the planet carrier, and the inner gear ring also rotates around the axis of the planet carrier. The second-stage sun gear 13 and the first-stage planet carrier 10 are fixedly connected together through a tooth-shaped spline, motion is transmitted to a second-stage planet gear, the second-stage planet gear transmits motion to a second-stage inner gear ring 8, in the second-stage transmission, the sun gear and the first-stage planet carrier 10 rotate synchronously, the second-stage planet carrier 7 is a double-row planet carrier, two ends of the planet carrier are respectively centered on the first box body 6 and the second box body through a bearing, meanwhile, the second-stage planet carrier 7 is connected with the output spline through the first spline, the left end of the output spline is connected with the output bearing seat 4 through the second spline, the output bearing seat 4 is fixedly connected to the rack, and finally, the second-stage planet carrier 7 is guaranteed to be in a static state all the time in work, and the second-stage inner gear ring 8 rotates. Because the two gear rings are fixedly connected, the first-stage inner gear ring and the second-stage inner gear ring rotate at the same speed and in the same direction. The outline of the whole speed reducer motion transmission route is as follows: the power is input by a first-stage sun gear 12, then is shunted to a first-stage inner gear ring 8 and a second-stage inner gear ring 8, then is converged to a box body through a first-stage gear ring and a second-stage gear ring, and finally is output by the box body in a rotating way.

Further, the first-stage planet carrier 10 is a single-row planet carrier, the second-stage planet carrier 7 is a double-row planet carrier, and the second-stage planet carrier 7 is centered on the box body through a bearing, so that the axial lead of the second-stage planet carrier 7 and the axial lead of the first planet carrier are always coaxial and parallel with the axial lead of the box body, even under the condition that the axial lead of the box body is inclined relative to the axial lead of the output shaft bearing seat 4 due to the machining error and loaded deformation of the frame.

Furthermore, a closing-in structure is made at the left end of the first 6 box bodies, the size of a bearing position journal on the first 6 box bodies is as small as possible under the condition that the output spline sleeve 2 is mounted, the self-aligning roller bearing 3 is selected as the bearing at the position, and the bearing on the winding drum shaft jointly support the winding drum assembly. And an oil seal position is formed at the position of the adjacent bearing position. Therefore, the size of the bearing and the size of the oil seal can be effectively reduced, the cost of the bearing is reduced, and the sealing reliability is improved. The limiting factor for the reduction of the bearing size is the outer diameter of the output spline housing 2, rather than the outer diameter of the conventional secondary planet carrier 7.

While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present specification describes embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and it is to be understood that all embodiments may be combined as appropriate by one of ordinary skill in the art to form other embodiments as will be apparent to those of skill in the art from the description herein.

Claims

1. The built-in speed reducer is characterized by comprising two stages of transmission mechanisms, wherein the first stage is NGW type planetary transmission, the second stage is ordinary gear train transmission similar to NGW structure form, the first stage transmission comprises a first stage sun gear (12), a first stage planet gear (11) and a first stage inner gear ring (9), the second stage transmission comprises a second stage sun gear (13), a second stage planet gear and a second stage inner gear ring (8), the first stage inner gear ring (9) and the second stage inner gear ring (8) are hinged together through a second box body, the speed reducer is further provided with an input spline housing (1), an external motor spline is connected with a left end spline of the input spline housing (1), a right end spline of the spline housing (1) is connected with the first stage sun gear (12) of the first stage transmission mechanism, the first stage transmission mechanism transmits power to the second transmission mechanism, the second transmission mechanism and the first transmission mechanism transmit power to the box body, and the second transmission mechanism and the first transmission mechanism output power through rotation of the box body.

2. The built-in reducer according to claim 1, wherein the first stage sun gear (12) and the first stage planet gear (11) are engaged through gears to transmit motion to the first stage planet carrier (10) and the first stage ring gear (9), respectively.

3. The built-in speed reducer according to claim 2, wherein said first stage sun gear (12) rotates around its own axis, said first stage planet carrier rotates around its own axis, said first stage planet gears (11) revolve around their own axis simultaneously in addition to rotating around their own axis, and said first stage ring gear (9) also rotates around its own axis.

4. An internal reducer according to claim 1, wherein the second stage transmission mechanism further comprises a toothed spline, and the second stage sun gear (13) and the first stage planet carrier are hinged together through the toothed spline to transmit motion to the second stage planet gears, which in turn transmit motion to the second stage annular gear (8).

5. The built-in speed reducer according to claim 3, wherein the second-stage planet carrier (7) is connected with the output spline through the first spline, the left end of the output spline is connected with the output bearing seat (4) through the second spline, the output bearing seat (4) is fixedly connected to the frame, and the second-stage planet carrier (7) is ensured to be in a static state all the time in operation, and the second-stage ring gear (8) rotates.

6. The built-in speed reducer according to claim 1, wherein said first stage planet carrier is a single row planet carrier, said second stage planet carrier (7) is a double row planet carrier, and said second stage planet carrier (7) is arranged on the box body through a bearing.

7. The built-in speed reducer according to claim 1, wherein the left end of the first box body (6) is provided with a closing structure.

8. The built-in speed reducer according to claim 1, wherein an oil seal is provided on the first box body (6) with a minimum bearing journal size.