CN216279215U - Double-star gear speed reducer - Google Patents

Abstract

The utility model designs a double-star gear speed reducer with larger transmission ratio by directly applying star gears, wherein a main star gear set and a secondary star gear set have the same planet pitch, two groups of star gears are coaxially arranged in parallel on a central shaft of a sun gear, the main sun gear and the secondary sun gear are fixedly connected with the central shaft and rotate concentrically at the same angular speed, a main internal gear is fixed, a planet carrier is concentric with the central shaft of the sun gear and can rotate around the central shaft of the sun gear under the pushing of the central shaft of the planet gear, the main sun gear is an input shaft gear, and the secondary internal gear is an output shaft gear. The utility model is different from the traditional star gear reducer in that the planetary gear reducer is provided with a planetary carrier and a planetary gear mechanism which can rotate backwards under the support of a tangent circular table and a circular ring, and the distances between the planets of two groups of star gear sets, namely the distances between the planetary gears and the center of a sun gear, are equal, so that the structure of the reducer is greatly simplified, the transmission is smooth and smooth, the transmission is larger, and the novel and creative characteristics are realized.

Description

Double-star gear speed reducer

Technical Field

The utility model relates to the field of mechanical planet wheel transmission, in particular to a double-star gear speed reducer.

Background

At present, a gear reducer, in particular a large transmission ratio high-precision reducer covers almost all patent technologies by a Japanese technology, wherein a harmonic drive reducer mainly comprises a wave generator, a flexible gear, a flexible bearing and a rigid gear, the harmonic drive reducer is a gear drive which is formed by assembling the flexible bearing on the wave generator to enable the flexible gear to generate controllable elastic deformation and to be meshed with the rigid gear to transfer motion and power, the harmonic drive reducer is a novel reducer developed by utilizing a planetary gear drive principle, but the flexible gear bears large alternating load, so that the requirements on fatigue resistance and processing of a flexible gear material are high, and the process is complex.

In addition, the transmission device of the RV reducer consists of a first-stage involute cylindrical gear planetary reduction mechanism and a second-stage cycloid pin gear planetary reduction mechanism, and is a structural schematic diagram of a closed differential gear train. The active sun wheel is connected with the input shaft, if the involute central wheel rotates clockwise, the involute central wheel drives three planetary wheels which are arranged in 120 degrees to revolve around the axis of the central wheel and also rotate anticlockwise, three crank shafts are fixedly connected with the planetary wheels and rotate at the same speed, two cycloidal gears with phase difference of 180 degrees are hinged on the three crank shafts and are meshed with the fixed pinwheels, and when the axis of the cycloidal gears revolves around the axis of the pinwheels, the cycloidal gears also rotate in opposite directions, namely rotate clockwise. The output mechanism (i.e. planet carrier) is driven by three pairs of crank shaft supporting bearings arranged on the output mechanism, and the rotation vector on the cycloid wheel is transmitted out at the speed ratio of 1:1, and the RV reducer has compact structure, large transmission ratio and transmission machinery with self-locking function under certain conditions, is one of the most commonly used reducers, and has small vibration, low noise and low energy consumption.

The patent number ZL201921246917.4 of a planetary gear driving device with a specific boss, which is applied by patentee in 2019, 08, 04 and innovates the planetary gear driving device with the specific boss, well solves the problems that a wheel, particularly a heavy-duty truck wheel, has huge radial acting force, a planetary gear mechanism is easy to deform, gear teeth are easy to damage, and gears of the planetary gear mechanism are easy to axially displace, and successfully realizes that the planetary gear is directly installed in a hub motor wheel of an integrated vehicle directly driven by a motor.

The double star gear reducer (patent number: ZL2020214193335) applied by the patentee at No. 07, month 18 in 2020, innovates a two-stage transmission mechanism of a driving wheel of an electric vehicle, and solves three new technical difficulties: firstly, because the internal gear of the planetary gear set is directly and rigidly arranged on the hub, once the gear of the planetary gear set is blocked and the rotation is stopped, the whole wheel is locked, which is extremely dangerous when the vehicle runs at high speed; secondly, the energy recovery of the electric vehicle is standard, and the energy recovery effect is not obvious when the electric vehicle is braked and decelerated; thirdly, because the transmission ratio is too small, the rotating speed of a driving motor used as a generator is not high when speed reduction and braking are needed, the hysteresis force is small, and the speed reduction and braking effects are not obvious.

The applicant (patentee) hopes to design a double-star gear reducer with larger transmission by directly applying star gears on the basis.

Disclosure of Invention

The utility model designs a double-star gear reducer with larger transmission ratio by directly applying star gears, which is characterized by comprising a main star gear set and a secondary star gear set, wherein the distances among the planets are the same, the two sets of the star gears are coaxially arranged in parallel at a central shaft of a sun gear, the main sun gear and the secondary sun gear are tightly connected with the central shaft and rotate concentrically at the same angular speed, the main planet gear is coaxial with the secondary planet gear, the main planet gear is tightly connected with the central shaft of the planet gear, the secondary planet gear is connected with the central shaft of the planet gear through a bearing, a ring-shaped planet carrier is connected with the central shafts of all planet gears through bearings, a main internal meshing gear is fixed, the planet carrier is concentric with the central shaft of the sun gear, the sun gear can rotate around the central shaft of the sun gear under the pushing of the central shaft of the planet gear, the main sun gear is an input shaft gear, and the secondary internal gear is an output shaft gear.

Circular truncated cones with the same diameter as the middle circle of the gear and the same thickness as the gear are fixedly connected with the gear coaxially and closely attached to the side wall on two sides of the planetary gear and the sun gear, circular rings with the same diameter as the middle circle of the gear and the same thickness as the gear are fixedly connected with the gear coaxially and closely attached to the side wall on two sides of the internal engaged gear, bearings are respectively arranged between the outer ring of the planet carrier and the inner edges of the main internal engaged gear and the auxiliary internal engaged gear, and bearings are arranged between the inner ring of the planet carrier and the outer edge of the central shaft of the sun gear.

The innovation points of the utility model are as follows: 1. the main internal gear is fixed, and the secondary internal gear performs the combined action of carrying from the sun gear and withdrawing from the planet carrier to rotate in a speed reduction way; 2. the diameters of the circular truncated cone and the circular ring of the gear are equal to the diameters of the circular rings in the corresponding gears, and the circular truncated cone and the circular ring are tangent to each other, so that the linear speeds are the same due to the meshing of the gears, and the mutual radial dislocation of the gears is effectively overcome; 3. the whole mechanism rotates coaxially and concentrically according to the planetary gear structure, the transmission is smooth and smooth, and the transmission ratio is large.

Drawings

Fig. 1 is a front view of a double star gear reducer (without a circular truncated cone ring).

Fig. 2 is an elevation view of a double star gear reducer (without a circular truncated cone).

Fig. 3 is a front view of a double star gear reducer (with a circular truncated cone ring).

Fig. 4 is a vertical view of a double star gear reducer (with a circular truncated cone ring).

1-main internal gear 2-slave internal gear 3-main planetary gear 4-slave planetary gear 5-main sun gear 6-slave sun gear 7-planet carrier.

Detailed Description

Example 1 this example double star gear reducer comprises a main star gear set and a secondary star gear set with a module of 1, the number of teeth 93 of the main inner tooth gear, the number of teeth 90 of the secondary inner tooth gear, and the pitch of the planet is 28.5mm, the two sets of planetary gears are coaxially arranged in parallel on the central axis of the sun gear, the main sun gear with the number of teeth 21 and the secondary sun gear with the number of teeth 24 are tightly connected with the central axis, and rotate concentrically at the same angular speed, the main planet gear with the number of teeth 36 is coaxial with the secondary planet gear with the number of teeth 33, the main planet gear is tightly connected with the central axis of the planet gear, the secondary planet gear is connected with the central axis of the planet gear through a bearing, a ring-shaped planet carrier is connected with the central axes of all planet gears through bearings, the main inner engaged gear is fixed, the planet carrier is concentric with the central axis of the sun gear and can rotate around the central axis of the sun gear under the push of the central axis of the planet gear, the main sun gear is an input shaft gear, the secondary internal gear is an output shaft gear.

When the main sun gear which is the input shaft rotates by one tooth, the rotation angle is 1/21 × 360 degrees, the auxiliary sun gear simultaneously rotates by the same angle, and the number of the rotating teeth is 24/21; if the main internal gear wheel is not stationary one tooth should be rotated in reverse, the rotation angle is 1/93 × 360 degrees, and the rotation angle from the internal gear is 24/21/90 × 360 degrees; the double-star gear reducer is designed in such a way that the main internal gear is fixed, the planet carrier and the planet gear integrally rotate backwards by one tooth, the backward rotation angle is 1/93 x 360 degrees, the actual angle of rotation of the slave inner cog is (24/21/90 x 360-1/93 x 360) degrees, the ratio of the angle of rotation of the master sun gear to the slave inner cog is (1/21 x 360): (24/21/90 x 360-1/93 x 360) has a value of about 24.47.

The key point of the innovative realization of the speed reduction function of the embodiment is that the main internal gear is fixed and carries from the sun gear and the planet carrier retreats to jointly act to reduce the speed and rotate, the whole mechanism coaxially and concentrically rotates according to the structure of the planetary gear, the transmission is smooth and smooth, and the transmission is large.

The circular truncated cones and circular rings with the diameters equal to the diameters of the circles in the corresponding gears are tightly attached to the two sides of the corresponding gears and coaxially and fixedly connected with each other in a tangent mode, the linear speeds are the same due to the meshing of the gears, only rolling is achieved, sliding is avoided, the problem that the gears are mutually and radially extruded, clamped and staggered is effectively solved, and high-precision speed reduction transmission is facilitated.

Example 2 the module of the main planetary gear set of this example is 1, the module of the secondary planetary gear set is 0.5, the number of teeth of the main inner meshing gear is 93, the number of teeth of the secondary inner meshing gear is 183, the pitch of the planet is 28.5mm, two sets of planetary gears are coaxially arranged in parallel on the central axis of the sun gear, the main sun gear with the number of teeth 21 and the secondary sun gear with the number of teeth 45 are tightly connected with the central axis, the concentric rotation is performed at the same angular speed, the main planetary gear with the number of teeth 36 is coaxial with the secondary planetary gear with the number of teeth 69, the main planetary gear is tightly connected with the central axis of the planetary gear, the secondary planetary gear is connected with the central axis of the planetary gear through a bearing, the ring-shaped planet carrier is connected with the central axes of all planetary gears through bearings, the main inner meshing gear is fixed, the planet carrier is concentric with the central axis of the sun gear, the sun gear can rotate around the central shaft of the sun gear under the pushing of the central shaft of the planet gear, the main sun gear is an input shaft gear, and the secondary internal gear is an output shaft gear.

When the main sun gear of the input shaft rotates by one tooth, the rotation angle is 1/21 × 360 degrees, the auxiliary sun gear rotates by the same angle and the number of the rotating teeth is 45/21, if the main internal gear is not fixed, the main internal gear should rotate by one tooth in reverse direction, the rotation angle is 1/93 × 360 degrees, the rotation angle of the auxiliary internal gear is 45/21/183 × 360 degrees, the double-star gear reducer in the embodiment is designed that the main internal gear is fixed, the whole planet carrier and the planet gear rotate by one tooth, the reverse rotation angle is 1/93 × 360 degrees, so the actual rotation angle of the auxiliary internal gear is (45/21/183 × 360-1/93 × 360), the rotation angle ratio of the main sun gear to the auxiliary internal gear is (1/21 × 360): 45/21/183-1/93 × 360), its value is about 50.

The utility model is different from the traditional star gear reducer which is a planet carrier and a planet gear mechanism which can rotate backwards under the support of a tangent circular table and a circular ring, and designs the equal distance between the planet medians of two groups of star gear sets, namely the distance between the planet wheels and the center of a sun gear, thereby greatly simplifying the structure of the reducer, having smooth and smooth transmission and larger transmission and having novelty and creativity.

The above description is for the purpose of describing the utility model in more detail with reference to specific preferred embodiments, and it should not be construed that the embodiments of the utility model are limited to those described herein, and it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the utility model.

Claims (2)

1. A double-star gear reducer with large transmission ratio is characterized by comprising a main star gear set and a secondary star gear set, wherein the distances among planets are the same, the two groups of star gear sets are coaxially arranged in parallel at a central shaft of a sun gear, the main sun gear and the secondary sun gear are fixedly connected with the central shaft and rotate concentrically at the same angular speed, the main planet gear is coaxial with the secondary planet gear, the main planet gear is fixedly connected with the central shaft of the planet gear, the secondary planet gear is connected with the central shaft of the planet gear through a bearing, a ring-shaped planet carrier is connected with all the central shafts of the planet gears through bearings, a main internal meshing gear is fixed and does not move, the planet carrier is concentric with the central shaft of the sun gear and can rotate around the central shaft of the sun gear under the pushing of the central shaft of the planet gear, the main sun gear is an input shaft gear, and the secondary internal meshing gear is an output shaft gear.

2. The dual star gear reducer of claim 1, wherein: circular truncated cones with the same diameter as the middle circle of the gear and the same thickness as the gear are fixedly connected with the gear coaxially and closely attached to the side wall on two sides of the planetary gear and the sun gear, circular rings with the same diameter as the middle circle of the gear and the same thickness as the gear are fixedly connected with the gear coaxially and closely attached to the side wall on two sides of the internal engaged gear, bearings are respectively arranged between the outer ring of the planet carrier and the inner edges of the main internal engaged gear and the auxiliary internal engaged gear, and bearings are arranged between the inner ring of the planet carrier and the outer edge of the central shaft of the sun gear.

Images