TWM603069U - Roller retaining device and reducer using the roller retaining device - Google Patents

Abstract

A roller retaining device, suitable for being assembled to a reducer, includes a bearing seat and a plurality of spacers. The spacer includes a first end used for connecting the bearing seat, a second end opposite to the first end, and two opposite limit surfaces. The spacers are separated from each other by a distance on the bearing seat. A roller rolling space is formed between the two adjacent limit surfaces of the two adjacent spacers and the bearing seat. The limiting surface includes a limiting groove extending between the first end and the second end. On two adjacent limit surfaces of two adjacent spacers, the minimum distance between two adjacent first edges is smaller than the minimum distance between two adjacent second edges, and the two adjacent first edges The minimum distance between the two edges is greater than the diameter of the roller.

Description

Roller retaining device and reducer using the roller retaining device

This creation relates to a reducer, in particular to a roller holding device that can restrict the rollers to a position close to the central axis and a reducer using the roller holding device.

Cycloid Speed Reducer (Cycloid Speed Reducer) is a common type of deceleration mechanism. Its principle is to achieve deceleration output through eccentric input and gear difference transmission. The structure of the general cycloid reducer mainly includes a Cycloid Disc, a Cross Oldham Coupling, a Flange and an input shaft (such as a crankshaft). The cross Oldham Coupling is set on the pendulum Between the wire wheel and the flange, the input shaft passes through the cycloid wheel, the cross Oudan and the flange. In order to enhance the load-bearing capacity of the components in the reducer (such as the input shaft), a number of rollers and one or more holding devices for holding these rollers at specific positions in the reducer are usually arranged in the reducer, so that These rollers can roll freely in their positions.

The existing reducer, as shown in Fig. 1A, is provided with a holding device A2 between the base shaft A1 and the collar A3. The holding device A2 is provided with a plurality of spaced apart spacers A21, and a roller A4 can be arranged between two adjacent spacers A21. However, the two adjacent side surfaces A211 of the two adjacent spacers A21 on which the roller A4 bears are both flat, so that the roller A4 is likely to fall off during the assembly process.

As shown in FIG. 1B, the conventional reducer has a plurality of spacers B21 arranged on the holding device B2. Similarly, on two adjacent spacers B21, the two phases supported by the roller B4 The adjacent side surface B211 is also flat, so that the roller B4 is likely to fall off during the assembly process.

As shown in Fig. 1C, a conventional reducer is provided with a plurality of spacers C21 spaced apart on the holding device C2, and each spacer C21 includes two opposite sides C211 on which the roller C4 bears. On two adjacent side surfaces C211 of two adjacent spacers C21, the shortest distance T between two adjacent edges C212 close to the radial inner side is smaller than the diameter D1 of the roller C4. And the radial distance H between the inner peripheral edge C213 and the outer peripheral edge C214 of such a holding device C2 is smaller than the diameter D1 of the roller C4. The radius of curvature of the center line G passing through the center point of the roller C4 is smaller than the radius of curvature of the inner peripheral edge C213. Therefore, the rollers C4 easily collide with each other due to the wear of the spacer C21 of the holding device C2, which shortens the service life of the reducer.

Therefore, the roller retaining device of the reducer still has room for improvement.

Therefore, the main purpose of this creation is to provide a roller holding device that can restrict the rollers to a position close to the central axis and a reducer using the roller holding device.

To achieve the above objective, a roller retaining device provided by an embodiment of the invention is suitable for being assembled to a reducer, the reducer includes a plurality of rollers, and the roller retaining device includes a bearing seat and a plurality of spacers. Pieces. The bearing seat has a ring structure, and the bearing seat includes a bearing surface. Each spacer includes a first end, a second end opposite to the first end, and two opposite limit surfaces. The first end is used to connect the bearing surface, and the spacers are connected to each other on the bearing surface. A distance apart, two adjacent limit surfaces of the two adjacent spacers and the bearing surface of the bearing seat form a rolling space for accommodating the roller, and the limit surface includes a A limit groove between the first end and the second end, the limit groove is used to limit the position of the roller toward the central axis of the roller retaining device Approaching, the limiting surface further includes a first edge close to the radially outer side of the roller retaining device, and a second edge close to the radially inner side of the roller retaining device and opposite to the first edge. On two adjacent limit surfaces of the adjacent spacers, the minimum distance between two adjacent first edges is smaller than the minimum distance between two adjacent second edges, and the two adjacent second edges The minimum distance is greater than the diameter of the roller.

In another embodiment of the roller retaining device, the limiting surface includes a first section close to the first edge and a first section close to the second edge and connected to the first section along the radial direction of the roller retaining device A second section of the second section is curved or flat, and the first section and the second section are not coplanar.

In still another embodiment of the roller retaining device, the limiting surface further includes a third section connected to the second section along the radial direction of the roller retaining device, and the second section is located at the first section. Between the section and the third section, the third section is curved or flat, and the third section and the second section are not coplanar.

In still another embodiment of the roller retaining device, the second section is a curved surface, and the radius of curvature of the second section is less than or equal to the radius of the roller.

In still another embodiment of the roller retaining device, each of the spacers further includes an outer surface and an inner surface opposite to the outer surface, the outer surface is connected to the limiting surfaces of the spacer, and the inner surface The limit surfaces of the spacer are connected, and the outer diameter of the outer surfaces is larger than the diameter of a circle formed by the contact nodes of the limit surfaces and the rollers.

In still another embodiment of the roller retaining device, each of the spacers further includes an outer surface and an inner surface opposite to the outer surface, the outer surface is connected to the limiting surfaces of the spacer, and the inner surface The limit surfaces of the spacer are connected, and the inner diameters of the inner surfaces are smaller than the diameter of a circle formed by the contact nodes of the limit surfaces and the rollers.

In another embodiment of the roller holding device, the roller holding device further includes a holding member for connecting the second ends of the spacers so that the bearing seat and two adjacent The spacer and the holder together constitute the rolling space.

In still another embodiment of the roller retaining device, the second end of each spacer includes a first engagement structure, and the retainer includes a plurality of second engagement structures, and the first engagement structures respectively correspond to and Used to join the second joining structures.

In still another embodiment of the roller retaining device, the vertical distance between the first edge and the second edge of the limiting surface of the spacer is greater than the radius of the roller.

In addition, the present invention further provides a reducer as described in any of the foregoing embodiments. The reducer further includes the roller retaining device, a cycloidal wheel and an input shaft, and the cycloidal wheel is used to sleeve the roller. A column holding device, the input shaft is used to pass through the roller holding device and the cycloidal gear, so that the roller holding device and the roller are located between the cycloidal gear and the input shaft.

As a result, the roller holding device of the reducer provided by this creation can keep the roller installed inside the reducer close to the central axis, so that the rollers are not easy to fall when the reducer is assembled. Improve the efficiency of assembly.

A1: Base shaft

A2: Holding device

A21: Spacer

A211: Side

A3: Ring

A4: Roller

B2: Holding device

B21: Spacer

B211: side

B4: roller

C2: Holding device

C21: Spacer

C211: side

C212: Edge

C213: inner periphery

C214: Outer periphery

C4: Roller

10: reducer

11: Input shaft

12: Roller retaining device

12A: Cage

12B: Cage

121: bearing seat

1211: inner surface

1212: outer surface

1213: bearing surface

1214: end face

122: Spacer

122A: Spacer

122B: Spacer

1221: first end

1221A: first end

1221B: first end

1222: second end

1222A: second end

1222B: second end

1223: limit surface

1223A: limit surface

1223B: limit surface

1224: inner surface

1224A: inner surface

1224B: inner surface

1225: outer surface

1225A: Outer surface

1225B: outer surface

1226: limit slot

1226A: Limit slot

1226B: Limit slot

1227A: first edge

1227B: first edge

1228A: second edge

1228B: second edge

1229: first joint structure

123: Holder

1231: second joint structure

13: Cycloidal wheel

14: Roller

CL: Pitch circle

D1: The diameter of the roller

D2: The diameter of the roller

G: Centerline

H: Radial distance

L1: minimum distance

L2: minimum distance

L3: minimum distance

L4: Minimum distance

L5: vertical distance

R1: Outer diameter

R2: inner diameter

R3: Pitch circle diameter

R4: radius of curvature

P: central axis

PD: contact node

S1: First section

S2: Second section

S3: Third section

T: shortest distance

V1: Housing space

V2: Housing space

V3: Housing space

θ 1: included angle

θ 2: included angle

After studying the detailed description in conjunction with the following drawings, you will find other aspects and advantages of this creation: Figure 1A is a partial cross-sectional view of an existing reducer to show the configuration between the roller and the roller retaining device; Figure 1B It is a partial cross-sectional view of the existing reducer to show the configuration between the roller and the roller retaining device; Figure 1C is a partial cross-sectional view of an existing reducer to show the configuration between the rollers and the roller retaining device; Figure 2 is an exploded schematic diagram of the reducer drawn according to an embodiment of the invention; Figure 3A is based on the invention A schematic diagram of a vertical cross-section of the reducer along its axis drawn according to an embodiment; Figure 3B is a schematic diagram of a transverse cross-section of the reducer along its axis drawn according to an embodiment of the invention; Figure 4 is a schematic diagram of the reducer drawn according to an embodiment of the invention An exploded perspective view of the roller retaining device; Figure 5 is a partially enlarged view of Figure 4 to show the structure of the spacer of the roller retaining device; Figure 6 is a partially enlarged view of Figure 3A to show two adjacent spaces 7 is a partial enlarged view of FIG. 6 to show the shape of the limiting surface of the spacer of the roller retaining device.

The detailed features and advantages of this creation will be described in detail in the following implementations. The content is sufficient to enable anyone familiar with relevant skills to understand the technical content of this creation and implement it accordingly, and in accordance with the content disclosed in this specification, the scope of patent application and the drawings. , Anyone who is familiar with relevant skills can easily understand the purpose and advantages of this creation. The following examples further illustrate the viewpoint of this creation in detail, but do not limit the scope of this creation by any viewpoint.

2 to 3B, the reducer 10 provided by the present invention according to an embodiment includes at least an input shaft 11, a roller holding device 12, at least one cycloid 13, a plurality of rollers 14, and Dan device (not shown) and a flange (not shown). The input shaft 11 is used to input a partial rotation force. The input shaft 11 may be, for example, a crankshaft, and at least one eccentric sleeve may be provided on the input shaft 11, for example. The roller holding device 12 has an accommodation space V1. The roller holding device 12 is also provided with a plurality of rolling spaces to accommodate the plurality of rollers 14 respectively. The cycloid 13 has a ring structure and has an accommodation space V2. The Oudan device and the flange are also ring-shaped structures and each has an accommodation space corresponding to the accommodation space V2.

During assembly, a plurality of rollers 14 are respectively installed in a plurality of rolling spaces V3 on the roller holding device 12, and the roller holding device 12 together with the rollers 14 are placed in the accommodating space V2 of the cycloid 13 and the input shaft 11 Pass through the accommodating space V1 of the roller holding device 12, the accommodating space V2 of the cycloid 13 and the accommodating space of the Oudan device and the flange, so that the roller holding device 12 and the roller 14 are located on the cycloid 13 And the input shaft 11. The Oudan device is arranged between the cycloid 13 and the flange, so that the Oudan device is used to perform the above-mentioned non-coaxial connection and transmission of the eccentric rotation force between the cycloid 13 and the flange.

In this embodiment or other embodiments, the roller retaining device 12 and the plurality of rollers 14 disposed thereon can be regarded as a roller bearing, for example. The roller holding device 12 may include at least one cage, as shown in the cages 12A and 12B. In this embodiment, the holder 12A can have the same structure as the holder 12B, and can be stacked back and forth in assembly. One cage can correspond to one cycloid 13 for example. In other words, the speed reducer 10 may include two cycloidal wheels 13, the holder 12A is covered by one of the cycloidal wheels 13, and the holder 12B is covered by the other cycloidal wheel 13. The following will take the holder 12A as an example for description.

Please refer to FIG. 3A and FIG. 4 to FIG. 6, the holder 12A includes a bearing seat 121 and a plurality of spacers 122. The bearing seat 121 has an annular structure, and the bearing seat 121 includes an inner surface 1211 on the radial inner side of the roller holding device 12 (that is, close to the central axis P of the roller holding device 12), and is opposite to the inner surface 1211 and held by the rollers. An outer surface 1212 on the radially outer side of the device 12 (that is, away from the central axis P of the roller retaining device 12), a bearing surface 1213 connecting the inner surface 1211 and the outer surface 1212, and opposite One end surface 1214 on the bearing surface 1213 and connecting the inner surface 1211 and the outer surface 1212. Each spacer 122 includes a first end 1221, a second end 1222 opposite to the first end 1221, two opposite limit surfaces 1223 extending between the first end 1221 and the second end 1222, and a roller An inner surface 1224 on the radially inner side of the holding device 12 and connecting the two limiting surfaces 1223 and an outer surface 1225 on the radially outer side of the roller holding device 12 and connecting the two limiting surfaces 1223. More specifically, the two limiting surfaces 1223 of each spacer 122 are arranged at intervals along the circumferential direction of the carrier 121.

The first end 1221 of the spacer 122 is used to connect the bearing surface 1213, such as inseparably connected to the bearing surface 1213 (for example, integral injection molding), or detachably assembled on the bearing surface 1213 (for example, using concave-convex fitting, inserting fitting, or Other feasible joining structures, etc.). The spacer 122 may extend from the bearing surface 1213 in a direction parallel to the central axis P of the roller holding device 12, for example. In other words, the spacers 122 are arranged in a needle shape on the supporting base 121. The spacers 122 are arranged at equal angular intervals on the bearing surface 1213 and are separated from each other by a distance. The limiting surface 1223 of the spacer 122 includes a limiting groove 1226 extending between the first end 1221 and the second end 1222. The limiting groove 1226 is used to limit the position of the roller 14 to approach the central axis P of the roller retaining device 12. The following lists examples to illustrate the details of the arrangement of two adjacent spacers 122 and rollers 14.

The two adjacent limit surfaces 1223A and 1223B of the two adjacent spacers 122A and 122B and the bearing surface 1213 of the bearing seat 121 form a rolling space V3 for accommodating the roller 14. The limiting surface 1221A (1221B) further includes a first edge 1227A (1227B) radially outward of the roller retaining device 12 and a first edge 1227A (1227B) radially inward of the roller retaining device 12 and relative to the first edge 1227A (1227B). Two edges 1228A (1228B). The limiting surface 1221B further includes a first edge 1227B radially outward of the roller retaining device 12 and a second edge 1228B radially inward of the roller retaining device 12 and opposite to the first edge 1227B. On the two adjacent limit surfaces 1223A and 1223B of the two adjacent spacers 122A and 122B, the two adjacent first edges 1227A and 1227B have the most The small distance L1 may be, for example, smaller than the diameter D2 of the roller 14, and also smaller than the minimum distance L2 between two adjacent second edges 1228A and 1228B, and the minimum distance L2 between two adjacent second edges 1228A and 1228B may be, for example, larger than the roller The diameter of 14 is D2. The minimum distance L3 between the two opposite first edges 1227A (1227B) of the spacer 122A (122B) (or the length of the outer surface 1225A (1225B) of the spacer 122A (122B) in the circumferential direction) may be, for example, greater than that of the spacer 122A (122B) ) The minimum distance L4 between the two opposite second edges 1228A (1228B) (or the length of the inner surface 1224A (1224B) of the spacer 122A (122B) in the circumferential direction). Thereby, the roller holding device 12 provided by the present invention can restrict the roller 14 to a position close to the central axis of the roller holding device 12, so that the roller 14 is not easy to fall when the reducer 10 is assembled, and the assembly can be lifted. s efficiency.

The outer diameters R1 of the outer surfaces 1225 of the spacers 122 of the cage 12A (that is, the outer surfaces 1225A of the spacers 122A and the outer surfaces 1225B of the spacers 122B) can be, for example, larger than the spacers 122 and the rollers 14 A Pitch Circle Diameter (PCD) R3 of a pitch circle CL formed by a plurality of contact nodes PD in contact. The inner diameters R2 of the inner surfaces 1224 of the spacers 122 of the cage 12A (that is, the inner surfaces 1224A of the spacers 122A and the inner surface 1224B of the spacers 122B) may be smaller than the pitch circle diameter R3, for example. Thereby, the purpose of restricting the roller 14 to a position close to the central axis of the roller holding device 12 can also be achieved.

In addition, the vertical distance L5 between the first edge 1227A (1227B) and the second edge 1228A (1228B) of the limiting surface 1223A (1223B) of the spacer 122A (122B) may be greater than the radius of the roller 14, for example. Therefore, the roller retaining device 12 installed in the reducer 10 can be resistant to wear and prevent collision between two adjacent rollers 14.

Please also refer to FIG. 7 again. The limiting surface 1223A of the spacer 122A includes a surface near the first edge 1227A along the radial direction of the roller retaining device 12 (that is, the axis perpendicular to the central axis P of the roller retaining device 12). A first section S1 and close to the second edge 1228A and connected A second section S2 of the first section S1. The first section S1 may be a plane, for example. The second section S2 may be, for example, a curved surface or a plane, and the first section S1 and the second section S2 are not coplanar. In other words, the extension plane of the second section S2 (when the second section S2 is a plane) or a tangent surface (when the second section S2 is a curved surface) has an included angle θ1 between the first section S1, and the included angle θ 1 is greater than 0 degrees and less than 30 degrees. In this embodiment or other embodiments, the limiting surface 1223A further includes a third section S3 connected to the second section S2 along the radial direction of the roller retaining device 12, and the second section S2 is located in the first section S1 Between and the third section S3. The third section S3 may be a plane, for example, and the third section S3 and the second section S2 are not coplanar, and the third section S3 and the first section S1 are also not coplanar. In other words, there is an included angle θ 2 between the extension plane (when the second section S2 is a plane) or a tangent surface (when the second section S2 is a curved surface) of the third section S3 and the second section S2. θ 2 may be, for example, greater than 0 degrees and less than 10 degrees, and may be, for example, smaller than the included angle θ 1. In this embodiment or other embodiments, the radius of curvature R4 of the second section S2 that is a curved surface may be, for example, less than or equal to the radius of the roller 14.

In this embodiment or other embodiments, the holder 12A may further include a holder 123, as shown in FIGS. 2 and 4. The holder 123 is used to connect the second ends 1222 of the plurality of spacers 122 of the holder 12A, so that the bearing seat 121, two adjacent spacers 122, and the holder 123 together form a rolling space V3 that can accommodate the roller 14 . In detail, the holding member 123 is detachably connected to the second end 1222 of the spacer 122, for example. The end edge of the second end 1222 of each spacer 122 includes a first joining structure 1229, and the holding member 123 includes a plurality of second joining structures 1231. The first joining structures 1229 correspond to the second joining structures 1231 respectively. The shape of the first joining structure 1229 matches the second joining structure 1231, so the first joining structure 1229 can be joined to the second joining structure 1231. For example, the shape of the first coupling structure 1229 may be a clamping claw shape, and the second coupling structure 1231 may be a column shape, and the clamping claw-shaped first coupling structure 1229 can clamp the columnar second coupling structure 1231. However, this creation is not limited to the examples listed above. In Bentron In other embodiments, the holding member 123 is inseparably connected to the second end 1222 of the spacer 122. For example, the entire cage 12A is formed in an integral manner.

The above-mentioned cages 12A and 12B are assembled in such a way that the bearing seat 121 of the cage 12A is arranged between the holder 123 of the cage 12A and the holder 123 of the cage 12B, and the holder 123 of the cage 12B is arranged on the cage 12A Between the bearing seat 121 of the holder 12B and the bearing seat 121 of the holder 12B, as shown in FIG. 3.

Although the above-mentioned embodiment is illustrated with two cages 12A and 12B with the same structure overlapping each other as an example, the present creation is not limited to this. In other embodiments, the two front and rear cages may share one retaining member. For example, the second end of the spacer of one of the cages and the second end of the spacer of the other cage are used to separate the two opposite ends of the retaining member. The side is connected to the holder. Or, two front and rear cages are integrated into one, for example, the opposite sides of the bearing seat of a cage (that is, the above-mentioned end surface and bearing surface) are respectively provided with axial (along the central axis of the roller retaining device) A plurality of spacers, the first end of each spacer is used to connect the bearing seat, the second end of the plurality of spacers on one side is used to connect a holder, and the plurality of spacers on the other side The second end is used to connect another holder.

To sum up, the roller retaining device provided by this creation is to provide a groove on the two opposite limit surfaces of the spacer for the roller to bear and the space to separate the rollers. It is restricted to the position close to the central axis of the roller holding device, so that the rollers are not easy to fall when the reducer is assembled, and the assembly efficiency can be improved. Or, by designing the size of each spacer or by designing the relative distance between two adjacent spacers, the purpose of restricting the roller to a position close to the central axis of the roller retaining device can be achieved, and even the installation The roller retaining device in the reducer is resistant to wear and prevents collisions between two adjacent rollers.

Although this creation is disclosed above with the aforementioned embodiments, these embodiments are not intended to limit the creation. Without departing from the spirit and scope of this creation, all changes and modifications made are within the scope of patent protection of this creation. For the scope of protection defined by this creation, please refer to the attached scope of patent application.

12A: Cage

121: bearing seat

1211: inner surface

1212: outer surface

1213: bearing surface

1214: end face

122: Spacer

1221: first end

1222: second end

1223: limit surface

1224: inner surface

1225: outer surface

1226: limit slot

123: Holder

1231: second joint structure

P: central axis

V3: Housing space

Claims (10)

A roller holding device is suitable for being assembled to a reducer, the reducer includes a plurality of rollers, the roller holding device includes: a bearing seat having a ring structure, the bearing seat including a bearing surface; and Spacers, each spacer includes a first end, a second end opposite to the first end, and two opposite limit surfaces, the first end is used to connect the bearing surface, and the spacers The bearing surfaces are separated from each other by a distance, and a rolling space for accommodating the roller is formed between the two adjacent limiting surfaces of the two adjacent spacers and the bearing surface of the bearing seat. The limiting surface It includes a limiting groove extending between the first end and the second end, and the limiting surface further includes a first edge close to the radially outer side of the roller retaining device and a diameter close to the roller retaining device Inwardly and opposite to a second edge of the first edge, and on two adjacent limiting surfaces of two adjacent spacers, the minimum distance between two adjacent first edges is less than two adjacent ones The minimum distance between the second edges of the two adjacent second edges, and the minimum distance between the two adjacent second edges is greater than the diameter of the roller. The roller retaining device according to claim 1, wherein the limiting surface includes a first section close to the first edge and a first section close to the second edge and connected to the first area along the radial direction of the roller retaining device A second section of a segment, the second section is curved or flat, and the first section and the second section are not coplanar. The roller retaining device according to claim 2, wherein the limiting surface further includes a third section connected to the second section along the radial direction of the roller retaining device, and the second section is located at the first section. Between a section and the third section, the third section is curved or flat, and the third section and the second section are not coplanar. The roller retaining device according to claim 2, wherein the second section is a curved surface, and the radius of curvature of the second section is less than or equal to the radius of the roller. The roller retaining device according to claim 1, wherein each of the spacers further includes an outer surface and an inner surface opposite to the outer surface, the outer surface is connected to the limit surfaces of the spacer, and the inner The surface is connected with the limit surfaces of the spacer, and the outer diameter of the outer surfaces is larger than the diameter of a circle formed by the contact nodes of the limit surfaces and the rollers. The roller retaining device according to claim 1, wherein each of the spacers further includes an outer surface and an inner surface opposite to the outer surface, the outer surface is connected to the limit surfaces of the spacer, and the inner The surface is connected to the limit surfaces of the spacer, and the inner diameter of the inner surfaces is smaller than the diameter of a circle formed by the contact nodes of the limit surfaces and the rollers. The roller retaining device according to claim 1, further comprising a retaining member for connecting the second ends of the spacers so that the bearing seat, two adjacent spacers and the The holders together constitute the rolling space. The roller retaining device according to claim 7, wherein the second end of each spacer includes a first engagement structure, and the retainer includes a plurality of second engagement structures, and the first engagement structures respectively correspond to And used to join the second joining structures. The roller retaining device according to claim 1, wherein the vertical distance between the first edge and the second edge of the limiting surface of the spacer is greater than the radius of the roller. A reducer using the roller holding device according to any one of claims 1 to 9, the reducer further comprising the roller holding device, a cycloid and an input shaft, the cycloid is used to cover The input shaft is arranged on the roller holding device, and the input shaft is used to pass through the roller holding device and the cycloid so that the roller holding device and the roller are located between the cycloid and the input shaft.

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