A planetary gearbox

Abstract

The present invention discloses a planetary gearbox, which relates to the technical field of mechanical equipment. The planetary gearbox comprises a housing, a ring gear, at least one planetary gear assembly and a sun gear assembly. The ring gear is fixedly arranged on the inner peripheral wall of the housing, and each planetary gear assembly is respectively meshed with the ring gear and the sun gear assembly; wherein the planetary gear assembly comprises a planet carrier, a pin shaft and a planetary wheel, the central axis of the planet carrier and the central axis of the housing are both a-axis, and the planet carrier and the housing are connected by at least one sliding bearing; the pin shaft is fixedly connected to the planet carrier; the planetary wheel is rotatably arranged on the pin shaft, and the planetary wheel is meshed with the ring gear. The planetary gearbox can reduce or maintain the original radial space, has low friction, is wear-resistant, has good lubrication effect and heat dissipation effect, and reduces the manufacturing cost at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical equipment, and in particular to a planetary gearbox. Background Art

[0002] Planetary gearboxes are used in wind power generation, engineering machinery, heavy transportation, metallurgy and mining, construction machinery, light industry and textiles, medical machinery, instrumentation, automobiles, ships, weapons, aerospace and other technical fields. The current planetary gearbox includes an outer shell, a gear ring, a planetary carrier, a planetary wheel and other parts. At least one bearing is arranged between the planetary carrier and the outer shell to ensure that the planetary carrier rotates relative to the outer shell. However, since the existing planetary gearbox is provided with a ball bearing between the planetary carrier and the outer shell, it is subjected to a large load and an extremely low output speed under normal circumstances. At the same time, it maintains a static load state for a long time. The ball bearing of the planetary gearbox bears a static load, occupies a large radial space and has a high cost. In addition, there are also technical problems such as a large friction coefficient, poor lubrication effect, slow heat dissipation and fast wear. Summary of the invention

[0003] The object of the present invention is to provide a planetary gearbox which can reduce or maintain the original radial space, has low friction, is wear-resistant, has good lubrication and heat dissipation effects, and reduces manufacturing costs.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] A planetary gearbox, comprising a housing, a ring gear, at least one planetary gear assembly and a sun gear assembly, wherein the ring gear is fixedly arranged on the inner peripheral wall of the housing, and each of the planetary gear assemblies is respectively meshed with the ring gear and the sun gear assembly; wherein the planetary gear assembly comprises a planet carrier, a pin shaft and a planetary wheel, wherein the central axis of the planet carrier and the central axis of the housing are both a-axis and the planet carrier and the housing are connected by at least one sliding bearing; the pin shaft is fixedly connected to the planet carrier; the planetary wheel is rotatably arranged on the pin shaft, and the planetary wheel is meshed with the ring gear; each of the sliding bearings comprises a bearing body for supporting the housing and a plurality of sliding blocks for abutting against the planet carrier, one end of the plurality of sliding blocks is arranged on the inner peripheral wall of the bearing body, and the other end can abut against the journal of the planet carrier, and two adjacent sliding blocks and the journal are arranged to form an accommodating cavity; the outer surface of each sliding block comprises an N1 surface, and the plurality of N1 surfaces are arranged toward the central axis of the bearing body, and the outer surface of the bearing body comprises an N4 surface, and the N1 surface protrudes from the N4 surface, and the N1 surface is a smooth plane; the outer surface of each sliding block also includes an N2 surface and an N3 surface arranged opposite to the N2 surface, the outer surface of the bearing body includes an N5 surface, at least one of the N2 surface and the N3 surface protrudes from the N5 surface, and the surface protruding from the N5 surface is a smooth plane.

[0006] Optionally, the central axis of each sliding bearing coincides with the a-axis.

[0007] Optionally, a plurality of the sliding blocks are evenly spaced apart and arranged on the inner circumferential wall of the bearing body.

[0008] Optionally, the bearing body is a rigid member.

[0009] Optionally, the sliding block is a composite material block.

[0010] Optionally, the bearing body is interference connected with the housing via a stopper, a pin, a nail or a retaining ring.

[0011] Optionally, the sliding block is interference-connected with the bearing body via a dovetail groove, a wedge groove, a pin, a nail or a retaining ring.

[0012] The beneficial effects of the present invention compared with the prior art are as follows: the planet carrier and the housing are connected by at least one sliding bearing, which is different from the prior art in which the planet carrier and the outer housing are connected by ball bearings, and the planetary gearbox of the present invention has low friction, good wear resistance, lubrication effect and heat dissipation effect, and reduces the manufacturing cost. In addition, since the bearing capacity of the sliding bearing is large, the radial space is saved compared with the ball bearing. In addition, the sliding bearing can also maintain the radial space of the planetary gearbox where the ball bearing is used, and the sliding bearing can be directly replaced by the ball bearing without adjusting other structures of the planetary gearbox, which is widely used and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a cross-sectional view of a planetary gearbox provided in a specific embodiment of the present invention;

[0014] Figure 2 It is a schematic structural diagram of a sliding bearing provided in a specific embodiment of the present invention.

[0015] Reference numerals:

[0016] Housing-1, ring gear-2, planetary gear assembly-3, planetary carrier-31, pin shaft-32, planetary gear-33, sliding bearing-34, bearing body-341, sliding block-342, planetary bearing-35, sun gear assembly-4. DETAILED DESCRIPTION

[0017] In order to make the technical problem solved by the present invention, the technical solution adopted and the technical effect achieved more clearly, the technical solution of the present invention is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0018] Reference below Figure 1-Figure 2 The specific structure of the planetary gearbox according to the embodiment of the present invention is described.

[0019] like Figure 1 As shown, the planetary gearbox includes a housing 1, a ring gear 2, at least one planetary gear assembly 3 and a sun gear assembly 4, the ring gear 2 is fixedly arranged on the inner circumferential wall of the housing 1, and each planetary gear assembly 3 is respectively meshed with the ring gear 2 and the sun gear assembly 4; wherein the planetary gear assembly 3 includes a planet carrier 31, a pin shaft 32 and a planetary wheel 33, the central axis of the planet carrier 31 and the central axis of the housing 1 are both a-axis, and the planet carrier 31 and the housing 1 are connected by at least one sliding bearing 34; the pin shaft 32 is fixedly connected to the planet carrier 31; the planetary wheel 33 is rotatably arranged on the pin shaft 32, and the planetary wheel 33 is meshed with the ring gear 2.

[0020] It is understandable that the planetary carrier 31 is connected to the housing 1 through at least one sliding bearing 34, which is different from the prior art in which the planetary carrier 31 and the outer housing 1 are connected through ball bearings, and the planetary gearbox of the present invention has low friction, good wear resistance, lubrication effect and heat dissipation effect, and reduces the manufacturing cost. In addition, since the bearing capacity of the sliding bearing 34 is large, the required radial space is smaller than that of the ball bearing, which saves radial space. It should be noted that the sliding bearing can also maintain the radial space of the planetary gearbox where the ball bearing is used. The sliding bearing can be directly replaced with the ball bearing without adjusting other structures of the planetary gearbox, which is widely used and convenient.

[0021] Alternatively, if Figure 2 As shown, each sliding bearing 34 includes a bearing body 341 for supporting the housing 1 and a plurality of sliding blocks 342 for abutting against the planetary carrier 31. One end of the plurality of sliding blocks 342 is arranged on the inner circumferential wall of the bearing body 341, and the other end can abut against the journal of the planetary carrier 31. Two adjacent sliding blocks 342 and the journal are surrounded by a receiving cavity.

[0022] It should be noted that the sliding block 342 and the planet carrier 31 form a friction pair, two adjacent sliding blocks 342 and the journal are surrounded by a receiving cavity, and each sliding bearing 34 has multiple receiving cavities, which is more conducive to the circulation of lubricating oil and has a good heat dissipation effect.

[0023] Optionally, the central axis of each sliding bearing 34 coincides with the a-axis to ensure normal sliding operation.

[0024] Optionally, the outer surface of each sliding block 342 includes an N1 surface, and multiple N1 surfaces are arranged toward the central axis of the bearing body 341. The outer surface of the bearing body 341 includes an N4 surface, and the N1 surface protrudes from the N4 surface and is a smooth plane.

[0025] It should be noted that when the a-axis is parallel to the horizontal direction, since the N1 surface protrudes from the N4 surface, the N1 surface of the sliding block 342 contacts the planetary carrier 31 for sliding, so the N1 surface of the sliding block 342 is a friction surface. Since the N1 surface is a smooth plane, the friction is reduced and the service life is extended.

[0026] Optionally, the outer surface of each sliding block 342 also includes an N2 surface and an N3 surface arranged opposite to the N2 surface, and the outer surface of the bearing body 341 includes an N5 surface, at least one of the N2 surface and the N3 surface protrudes from the N5 surface, and the surface protruding from the N5 surface is a smooth plane.

[0027] It should be particularly noted that when the a-axis is perpendicular to the horizontal direction, that is, when the a-axis is parallel to or coincides with the horizontal direction, the planetary gearbox is rotated 90 degrees, and the surface protruding from the N5 surface contacts the planetary carrier 31 for sliding. Therefore, the surface of the sliding block 342 protruding from the N5 surface is a friction surface. Since the surface protruding from the N5 surface is a smooth plane, the friction is reduced and the service life is extended.

[0028] In summary of the above two situations, since the N1 surface and the surface protruding from the N5 surface are both smooth planes, the friction can be reduced and the service life can be extended regardless of whether the planetary gearbox is in a horizontal position or a vertical position.

[0029] Optionally, multiple sliding blocks 342 are evenly spaced and arranged on the inner circumferential wall of the bearing body 341, so that the bearing capacity is more uniform and radial space is further saved. Of course, in other embodiments of the present invention, multiple sliding blocks 342 are not limited to being evenly spaced and arranged on the inner circumferential wall of the bearing body 341, and can be selected according to different working conditions of the planetary gearbox.

[0030] Optionally, the bearing body 341 is a rigid part with good hardness and can better support the housing 1 .

[0031] Optionally, the sliding block 342 is a composite material block with low friction and wear resistance. Advantageously, the sliding block 342 is a composite material block containing fluorinated polyethylene, which has low cost, good wear resistance and high cost performance.

[0032] Optionally, the bearing body 341 is interference-connected with the housing 1 through a stopper, a pin, a nail or a retaining ring. Of course, in other embodiments of the present invention, other options can be made according to actual needs.

[0033] Optionally, the sliding block 342 is interference-connected with the bearing body 341 through a dovetail groove, a wedge groove, a pin, a nail or a retaining ring. Of course, in other embodiments of the present invention, other options can be made according to actual needs.

[0034] Advantageously, the planetary gear assembly 3 further includes a planetary bearing 35, and the pin 32 is connected to the planetary gear 33 via the planetary bearing 35. Figure 1 In the embodiment shown, the planet bearings 35 are rolling bearings.

[0035] Advantageously, the shape of the outer side wall of the bearing body 341 is not particularly limited.

[0036] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0037] In addition, it should be understood that the orientations or positional relationships indicated by terms such as "upper", "lower", "inside", "outside", "vertical", and "horizontal" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0038] In the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", "installed", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above-mentioned terms in the present invention can be understood according to specific circumstances.

[0039] In addition, features defined as "first" or "second" may explicitly or implicitly include one or more of the features, and are used to distinguish and describe features, without distinction of order or importance. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0040] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The content of this specification should not be understood as limiting the present invention.

Claims

1. A planetary gearbox, comprising a housing (1), a ring gear (2), at least one planetary gear assembly (3) and a sun gear assembly (4), wherein the ring gear (2) is fixedly arranged on the inner peripheral wall of the housing (1), and each of the planetary gear assemblies (3) is respectively meshed with the ring gear (2) and the sun gear assembly (4); wherein: The planetary gear assembly (3) comprises a planet carrier (31), a pin shaft (32) and a planetary wheel (33); the central axis of the planet carrier (31) and the central axis of the housing (1) are both a-axis, and the planet carrier (31) and the housing (1) are connected via at least one sliding bearing (34); the pin shaft (32) is fixedly connected to the planet carrier (31); the planetary wheel (33) is rotatably mounted on the pin shaft (32), and the planetary wheel (33) is meshed with the ring gear (2); Each of the sliding bearings (34) comprises a bearing body (341) for supporting the housing (1) and a plurality of sliding blocks (342) for abutting against the planet carrier (31); one end of the plurality of sliding blocks (342) is arranged on the inner circumferential wall of the bearing body (341), and the other end is capable of abutting against the shaft neck of the planet carrier (31); two adjacent sliding blocks (342) and the shaft neck are arranged to form an accommodating cavity; The outer surface of each sliding block (342) further comprises an N2 surface and an N3 surface arranged opposite to the N2 surface, the outer surface of the bearing body (341) comprises an N5 surface, at least one of the N2 surface and the N3 surface protrudes from the N5 surface, and the surface protruding from the N5 surface is a smooth plane; and the outer surface of each sliding block (342) comprises an N1 surface, a plurality of the N1 surfaces are arranged toward the central axis of the bearing body (341), the inner surface of the bearing body (341) comprises an N4 surface, the N1 surface protrudes from the N4 surface, and the N1 surface is a smooth plane; The bearing body (341) is interference-connected with the housing (1) via a stopper, a pin, a nail or a retaining ring; The sliding block (342) is interference-connected with the bearing body (341) via a dovetail groove, a wedge groove, a pin, a nail or a retaining ring.

2. The planetary gearbox according to claim 1, characterized in that: The central axis of each sliding bearing (34) coincides with the a-axis.

3. The planetary gearbox according to claim 2, characterized in that: The plurality of sliding blocks (342) are evenly spaced and arranged on the inner peripheral wall of the bearing body (341).

4. The planetary gearbox according to claim 2, characterized in that: The bearing body (341) is a rigid part.

5. The planetary gearbox according to claim 2, characterized in that: The sliding block (342) is a composite material block.

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