CN216895708U

CN216895708U - Planetary gear device

Info

Publication number: CN216895708U
Application number: CN202220231745.9U
Authority: CN
Inventors: 王峰; 刘海林; 常方坡
Original assignee: Anhui Heli Co Ltd
Current assignee: Anhui Heli Co Ltd
Priority date: 2022-01-27
Filing date: 2022-01-27
Publication date: 2022-07-05
Anticipated expiration: 2032-01-27

Abstract

The utility model discloses a planetary gear device which comprises an inner gear ring and a planetary mechanism, wherein the planetary mechanism is positioned on the radial inner side of the inner gear ring and is meshed with the inner gear ring; the bearing inner ring is connected with the planet carrier in an interference fit mode, and the roller is freely arranged between the planet wheel and the bearing inner ring in a rolling mode. The roller bearing adopted in the utility model has no bearing outer ring, and the inner hole of the planet wheel replaces the bearing outer ring, and the inner hole and the outer ring are matched with each other, thereby reducing assembly parts, reducing the structural complexity and saving raw materials. Because the roller bearing has no retainer, the sliding friction between the retainer and the roller is avoided, the service life of the roller bearing is prolonged, and the roller bearing is more favorable for disassembly and maintenance.

Description

Planetary gear device

Technical Field

The utility model relates to the technical field of gears, in particular to a planetary gear device.

Background

With the carbon neutralization concept widely popularized by the country, the electric forklift is an important development direction of the forklift industry. The drive unit of the electric forklift usually adopts a planetary gear train as a speed reducing mechanism, the rotational speed of a planetary gear (a straight gear) is low, and a large radial load can be borne in the operation process. The cylindrical roller bearing has a linear contact mode between a roller and a raceway, and has a large radial load bearing capacity, so that the use of the cylindrical roller bearing (hereinafter referred to as a bearing or a roller bearing) in the planetary gear is a very common phenomenon.

At present, the assembly of a planetary gear and a bearing is generally carried out by matching a bearing outer ring and a planetary gear inner ring, and although the assembly ensures flexible operation, the number of assembly parts is increased and the material consumption is relatively high; when the planet wheel low rotational speed was in operation, great radial load needed the better bearing of radial bearing capacity, and great radial load makes the inside friction aggravation of bearing simultaneously, and wherein the sliding friction wearing and tearing that holder and cylindrical roller produced are great, influence cylindrical roller bearing's life-span.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a planetary gear device, which aims to solve the problems in the background technology, and the inner hole of a planetary gear is used as a bearing outer ring to be matched with a roller bearing, so that the number of assembly parts is reduced, the structural complexity is reduced, and the abrasion of a roller can be reduced.

In order to achieve the purpose, the utility model provides the following technical scheme:

a planetary gear device comprises an inner gear ring and a planetary mechanism which is positioned at the radial inner side of the inner gear ring and is meshed with the inner gear ring, wherein the planetary mechanism comprises a planet carrier, a roller bearing coaxially sleeved on the periphery of the planet carrier and a planet wheel coaxially sleeved on the roller bearing, and the roller bearing comprises a bearing inner ring and a roller circumferentially arranged at the radial outer side of the bearing inner ring; the bearing inner ring is connected with the planet carrier in an interference fit mode, and the roller is freely arranged between the planet wheel and the bearing inner ring in a rolling mode.

As a further scheme of the utility model: the planet carrier comprises a first shaft section and a second shaft section which are coaxially connected, and the outer diameter of the second shaft section is smaller than that of the first shaft section; a first annular groove is formed in the circumferential direction of the outer wall of one side of the second shaft section, which is far away from the first shaft section, and a first check ring is arranged in the first annular groove; the second shaft section is located to the bearing inner race cover, and, bearing inner race both ends lean on with first shaft section and first retaining ring counterbalance respectively.

As a further scheme of the utility model: and second annular grooves are symmetrically formed in the inner walls of the planet wheels at the two ends of the roller bearing, and second check rings are arranged in the second annular grooves.

As a further scheme of the utility model: and a baffle ring is arranged between the roller and the second baffle ring, and the baffle ring is in clearance fit connection with the planet wheel.

As a further scheme of the utility model: the second retainer ring is an elastic retainer ring.

Compared with the prior art, the utility model has the beneficial effects that:

the roller bearing adopted in the utility model has no bearing outer ring, and the inner hole of the planet wheel replaces the bearing outer ring, and the inner hole and the bearing outer ring are matched with each other, so that the number of assembly parts is reduced, the structural complexity is reduced, and the raw materials are saved.

The roller bearing is not provided with a traditional retainer, so that the internal space of the planetary mechanism is saved, and the rollers with more quantity and larger outer diameter can be accommodated correspondingly, thereby improving the radial bearing capacity of the roller bearing. Because the roller bearing has no retainer, the sliding friction between the retainer and the roller is avoided, the service life of the roller bearing is prolonged, and the roller bearing is more favorable for disassembly and maintenance.

Drawings

FIG. 1 is a side cross-sectional view of the present invention;

FIG. 2 is a schematic view of a roller bearing according to the present invention;

in the figure: 1-inner gear ring, 2-planetary mechanism, 21-planetary carrier, 211-first shaft section, 212-second shaft section, 22-roller bearing, 221-bearing inner ring, 222-roller, 23-planetary gear, 3-first retainer ring, 4-second retainer ring and 5-retainer ring.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally placed when the products of the present invention are used, and are used only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; the connection can be mechanical connection or communication connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1-2, in an embodiment of the present invention, a planetary gear device includes an inner gear ring 1, and a planetary mechanism 2 located at a radial inner side of the inner gear ring 1 and engaged with the inner gear ring 1, where the planetary mechanism 2 includes a planet carrier 21, a roller bearing 22 coaxially sleeved on an outer periphery of the planet carrier 21, and a planet wheel 23 coaxially sleeved on the roller bearing 22, where the roller bearing 22 includes a bearing inner ring 221 and a roller 222 circumferentially arranged at a radial outer side of the bearing inner ring 221; the bearing inner ring 221 is connected with the planet carrier 21 in an interference fit manner, that is, the planet carrier 21 can drive the bearing 221 to rotate; a raceway is formed on the outer circumferential surface of the bearing inner ring 221, and rollers 222 are arranged in the raceway so as to be rollable and roll between the planetary gear 23 and the bearing inner ring 221. The roller bearing 22 has no bearing outer ring, the inner hole of the planet wheel 23 replaces the bearing outer ring, and the inner hole and the bearing outer ring are matched with each other, so that the number of assembly parts is reduced, and the structural complexity is reduced.

Further, the planet carrier 21 comprises a first shaft section 211 and a second shaft section 212 which are coaxially and integrally connected, and the outer diameter of the second shaft section 212 is smaller than that of the first shaft section 211; a first annular groove is formed in the circumferential direction of the outer wall of one side, far away from the first shaft section 211, of the second shaft section 212, and a first retainer ring 3 is arranged in the first annular groove; the roller bearing inner ring 221 is sleeved on the second shaft section 212, two ends of the bearing inner ring 221 are respectively abutted against the first shaft section 211 and the first retainer ring 3, and a shaft shoulder of the first shaft section 211 is matched with the first retainer ring 3 to axially limit the bearing inner ring 221.

Furthermore, the inner walls of the planet wheels 23 at the two ends of the roller bearing 22 are symmetrically provided with second annular grooves, and the second annular grooves are provided with second retaining rings 4. The second ring gear 4 axially limits the planet gear 23. A retainer ring 5 is arranged between the roller 222 and the second retainer ring 4, and the retainer ring 5 is in clearance fit connection with the planet wheel 23. The retainer ring 5 and the second retainer ring 4 cooperate with each other to axially retain the roller 222. When the planet gears 23 are engaged with the inner gear ring 1 to run, the roller bearings 22 can bear large radial load, and the abrasion of the bearings can be reduced.

Further, the second retainer 4 is an elastic retainer ring, and the elastic retainer ring made of elastic material provides buffering for the planet wheel 23 in operation.

With reference to fig. 2, the roller bearing 22 includes a bearing inner ring 221, a raceway is formed on an outer circumference of the bearing inner ring 211, and a plurality of rollers 222 arranged in a circular ring shape can freely roll in the raceway.

When the utility model is in operation, the planet wheels 23 of the planetary mechanism 2 rotate around the axis of the second shaft section 212 and simultaneously revolve around the geometric axis of the planet carrier 21 along with the planet carrier 21; when the planet wheel 23 rotates, the roller 222 rolls freely between the raceway and the inner wall of the planet wheel 23; as the planet 23 orbits, the rollers 222 and the bearing cones 211 rotate about the geometric axis of the planet carrier 21.

Although the present description is described in terms of embodiments, not every embodiment includes only a single embodiment, and such description is for clarity only, and those skilled in the art should be able to integrate the description as a whole, and the embodiments can be appropriately combined to form other embodiments as will be understood by those skilled in the art.

Therefore, the above description is only a preferred embodiment of the present application, and is not intended to limit the scope of the present application; all changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.

Claims

1. A planetary gear device comprises an inner gear ring (1) and a planetary mechanism (2) which is positioned on the radial inner side of the inner gear ring (1) and is meshed with the inner gear ring, wherein the planetary mechanism (2) comprises a planetary carrier (21), a roller bearing (22) coaxially sleeved on the periphery of the planetary carrier (21) and a planetary gear (23) coaxially sleeved on the roller bearing (22), and is characterized in that the roller bearing (22) comprises a bearing inner ring (221) and a roller (222) circumferentially arranged on the radial outer side of the bearing inner ring (221); wherein the bearing inner ring (221) is connected with the planet carrier (21) in an interference fit manner, and the roller (222) is freely arranged between the planet wheel (23) and the bearing inner ring (221) in a rolling manner.

2. A planetary gearing according to claim 1, characterized in that said planet carrier (21) comprises a first shaft section (211) and a second shaft section (212) coaxially connected, said second shaft section (212) having an outer diameter smaller than the outer diameter of the first shaft section (211); a first annular groove is formed in the circumferential direction of the outer wall of one side, away from the first shaft section (211), of the second shaft section (212), and a first retainer ring (3) is arranged in the first annular groove; the second shaft section (212) is sleeved with the bearing inner ring (221), and two ends of the bearing inner ring (221) are respectively abutted against the first shaft section (211) and the first retainer ring (3).

3. A planetary gear according to claim 1, characterized in that the inner walls of the planet wheels (23) at the two ends of the roller bearing (22) are symmetrically provided with second annular grooves, and the second annular grooves are provided with second retaining rings (4).

4. A planetary gearing according to claim 3, characterized in that a retainer ring (5) is arranged between the roller (222) and the second retainer ring (4), said retainer ring (5) being in clearance fit connection with the planet wheels (23).

5. A planetary gearing according to claim 3, characterized in that said second retaining ring (4) is a circlip.