CN221347777U

CN221347777U - Harmonic speed reducer

Info

Publication number: CN221347777U
Application number: CN202323184110.1U
Authority: CN
Inventors: 朱华; 黄水平; 沈晓龙
Original assignee: Shenzhen Tongchuan Technology Co ltd
Current assignee: Shenzhen Tongchuan Technology Co ltd
Priority date: 2023-11-23
Filing date: 2023-11-23
Publication date: 2024-07-16
Anticipated expiration: 2033-11-23

Abstract

The application relates to the technical field of speed reducers, and discloses a harmonic speed reducer, which comprises a base, an input shaft positioned in the base, a flexible gear and a steel gear, wherein the flexible gear comprises a fixing part fixed on the base, a cylindrical tooth part and a connecting part for connecting the fixing part and the tooth part, a containing cavity for containing lubricating oil is reserved between the connecting part and the input shaft, the steel gear is positioned on the outer peripheral side of the flexible gear, the inner wall of the steel gear is attached to the outer peripheral side of the gear, a flexible bearing is arranged between the inner peripheral side of the tooth part and a cam of the input shaft, a front cover is arranged at one end of the steel gear, which is far away from the base, a deep groove ball bearing is arranged between the front cover and the input shaft, a baffle is arranged between the front cover and the input shaft, and the baffle is positioned between the deep groove ball bearing and the flexible bearing. The application can achieve the expected lubrication effect under the condition that grease does not overflow.

Description

Harmonic speed reducer

Technical Field

The application relates to the technical field of speed reducers, in particular to a harmonic speed reducer.

Background

At present, in the application of the harmonic speed reducer, the starting torque is usually reduced by removing an oil seal under the working condition of low starting torque, but the method causes the potential risk of oil overflow in the speed reducer and has negative influence on the performance and service life of the speed reducer.

In order to cope with this problem, referring to fig. 1, the conventional harmonic speed reducer comprises a base 1 and an input shaft 2 located inside the base 1, and further comprises a flexible gear 3, wherein the flexible gear 3 is arranged outside the input shaft 2, a steel gear 4 is arranged outside the flexible gear 3, a sealing ring 100 is arranged between the flexible gear 3 and a connecting portion 33 of the steel gear 4, after the speed reducer is assembled, lubricating oil is arranged on one side of the sealing ring 100, facing to a tooth portion 32 of the flexible gear 3, and the sealing ring 100 plays a sealing role between the flexible gear 3 and the steel gear 4 to prevent the lubricating oil from flowing to the outer side of the sealing ring 100.

In the related art, although the lubricating oil does not overflow out of the speed reducer, the space for accommodating the lubricating oil is small between the flexspline 3 and the steel spline 4, so that the amount of the lubricating oil in the harmonic speed reducer is small, and the expected lubricating effect may not be achieved.

Disclosure of Invention

In order to achieve the expected lubrication effect under the condition that grease does not overflow, the application provides a harmonic speed reducer.

The application provides a harmonic reducer, which adopts the following technical scheme:

The utility model provides a harmonic speed reducer, includes the base and is located the inside input shaft of base, still includes flexbile gear and steel wheel, flexbile gear is including being fixed in fixed part on the base, be the tooth portion of tube-shape and will fixed part with connecting portion that tooth portion connects, connecting portion with leave the holding chamber that holds lubricating oil between the input shaft, the steel wheel is located flexbile gear's periphery side, the inner wall of steel wheel with tooth portion periphery laminating, the inner periphery side of tooth portion with be provided with flexible bearing between the cam of input shaft, the steel wheel is kept away from the one end of base is installed the protecgulum, the protecgulum with be provided with deep groove ball bearing between the input shaft, the protecgulum with install the separation blade between the input shaft, the separation blade still is located between the deep groove ball bearing and the flexible bearing.

Through adopting above-mentioned technical scheme, the holding chamber that leaves between the connecting portion of flexbile gear and the input shaft distributes along the circumference of whole input shaft, can hold more lubricating oil, has improved the inside quantity of lubricating oil of harmonic speed reducer to realize anticipated lubrication effect, the separation blade of installation can reduce inside lubricating oil of harmonic speed reducer and spill over, makes the life of speed reducer be difficult for receiving the influence, also enables the speed reducer to have better stability.

Optionally, the separation blade is the maze separation blade, the maze separation blade including be platelike shelter from portion, with shelter from the relative both ends first connecting piece and the second connection piece of being connected of portion, shelter from the portion be located flexible bearing with between the deep groove ball bearing, first connecting piece install in on the input shaft, the second connection piece is close to the steel wheel.

Through adopting above-mentioned technical scheme, the setting of maze separation blade overall structure like maze wall can not be the straight face, and on first connecting piece and the second connection piece of maze separation blade no longer coplanar, the interval between protecgulum and the input shaft overflowed in the maze separation blade can be stopped well, and the maze separation blade is fixed on the input shaft through the cooperation of first connecting piece and deep groove ball bearing, when shelter from the portion and block that lubricating oil overflows outside the speed reducer, the second connection piece can further block that lubricating oil overflows.

Optionally, the front cover is close to the end face of the flexible bearing and is provided with a groove, and the second connecting piece extends into the groove.

Through adopting above-mentioned technical scheme, the second connection piece extends to in the recess, can prolong the labyrinth separation blade and shelter from the route of lubricating oil to make lubricating oil be difficult for spilling over outside the speed reducer more.

Optionally, a gap is left between the second connecting piece and the inside of the groove.

Through adopting above-mentioned technical scheme, in the second connection piece of maze separation blade is along to the recess, second connection piece and recess do not have interference cooperation, reduce inside grease and spill over, also can make the input shaft rotate more smoothly.

Optionally, a baffle ring is fixedly connected to one end of the outer ring of the deep groove ball bearing, which is away from the baffle plate, and the baffle ring part is contacted with the inner ring of the deep groove ball bearing.

By adopting the technical scheme, if a small amount of lubricating oil enters the deep groove ball bearing, the baffle ring can further intercept the lubricating oil.

Optionally, a gap is left between the baffle ring and the input shaft.

By adopting the technical scheme, the clearance is reserved between the baffle ring and the input shaft, and the baffle ring has little influence on the rotation of the input shaft.

Optionally, the baffle is installed between the inner ring and the outer ring of the deep groove ball bearing, and the baffle is in sliding contact with the inner ring and the outer ring of the deep groove ball bearing.

By adopting the technical scheme, the baffle can prevent lubricating oil from overflowing out of the speed reducer from the deep groove ball bearing.

Optionally, the number of the blocking pieces is two, and the balls of the deep groove ball bearing are located between the two blocking pieces.

By adopting the technical scheme, the two baffle plates can better block the deep groove ball bearing from overflowing out of the speed reducer.

In summary, the present application includes at least one of the following beneficial effects:

1. The accommodating cavity reserved between the connecting part of the flexible gear and the input shaft is used for accommodating lubricating oil, so that the accommodating space of the lubricating oil can be increased to achieve the expected lubricating effect;

2. The installation of the baffle can ensure that lubricating oil in the speed reducer is not easy to overflow out of the speed reducer.

Drawings

FIG. 1 is a cross-sectional view of an overall structure of a related art;

FIG. 2 is an overall construction diagram of a first embodiment of the present application;

FIG. 3 is a schematic view of a flexspline according to an embodiment of the present application;

FIG. 4 is a cross-sectional view of the overall structure of a first embodiment of the application;

FIG. 5 is an enlarged schematic view at A of FIG. 4;

FIG. 6 is a cross-sectional view of the overall structure of a second embodiment of the present application;

fig. 7 is an enlarged schematic view at B of fig. 6.

Reference numerals illustrate: 1. a base; 2. an input shaft; 21. a cam; 3. a flexible wheel; 31. a fixing part; 32. tooth parts; 33. a connection part; 331. a first connecting part; 332. a second connecting part; 4. a steel wheel; 5. a flexible bearing; 6. a front cover; 61. a groove; 62. a convex edge; 7. deep groove ball bearings; 71. a baffle ring; 8. a receiving chamber; 9. a baffle; 90. labyrinth baffle plates; 901. a shielding part; 902. a first connecting piece; 903. a second connecting piece; 91. a mounting part; 10. an outer shell; 20. a crossed roller bearing; 100. and (3) sealing rings.

Detailed Description

The application is described in further detail below with reference to fig. 2-7.

Embodiment one:

The embodiment of the application discloses a harmonic reducer. Referring to fig. 2 and 3, a harmonic reducer includes a base 1, an input shaft 2 disposed inside the base 1, a flexspline 3, and a steel spline 4, the steel spline 4 being disposed on the outer circumferential side of the flexspline 3. The flexspline 3 includes a fixed portion 31, a cylindrical tooth portion 32, and a connecting portion 33 connecting the fixed portion 31 and the tooth portion 32. The flexible gear 3 is fixed on the base 1 through a fixing part 31, and a bearing is arranged between the base 1 and the input shaft 2; the inner wall of the steel wheel 4 is attached to the outer peripheral side of the tooth portion 32, and a flexible bearing 5 is provided between the inner peripheral side of the tooth portion 32 and the cam 21 of the input shaft 2. The steel wheel 4 is kept away from the one end of base 1 and installs protecgulum 6, and protecgulum 6 is close to and is provided with deep groove ball bearing 7 between the inner wall of input shaft 2 and the input shaft 2.

Referring to fig. 2, the receiving chamber 8 for receiving the lubricating oil is left between the connecting portion 33 and the input shaft 2, and the receiving chamber 8 is circumferentially distributed along the entire input shaft 2, so that the receiving chamber 8 has a large overall space, and can receive more lubricating oil. The lubricating effect can be expected after more lubricating oil is arranged in the speed reducer, in order to ensure that the lubricating oil in the speed reducer is not easy to overflow out of the speed reducer, the baffle plate 9 is arranged between the front cover 6 and the input shaft 2, the baffle plate 9 is further arranged between the deep groove ball bearing 7 and the flexible bearing 5, and the baffle plate 9 can prevent the lubricating oil from overflowing out of the speed reducer to a large extent.

Referring to fig. 3, the connection part 33 includes a first connection part 331 and a second connection part 332, and the first connection part 331 and the second connection part 332 are integrally formed. The first connecting part 331 is in a cylindrical structure, the first connecting part 331 is connected with the tooth part 32, the second connecting part 332 is in an annular structure, and the second connecting part 332 is connected with the fixing part 31.

Referring to fig. 2 and 3, an outer case 10 is connected to a surface of the fixing portion 31 facing away from the base 1, and the base 1, the fixing portion 31 of the flexspline 3, and the outer case 10 are fixedly connected. A crossed roller bearing 20 is installed between the outer shell 10 and the connecting part 33 of the flexible gear 3, and the inner ring of the crossed roller bearing 20 is fixedly connected with the steel wheel 4 and the front cover 6 through screws. After the lubricating oil penetrates between the tooth portion 32 and the steel wheel 4, the lubricating oil can enter the crossed roller bearing 20 along the first connecting portion 331 and the second connecting portion 332 to have a lubricating effect. A blocking ring is arranged between the inner ring and the outer ring of the crossed roller bearing 20, and can also block lubricating oil, so that the harmonic speed reducer achieves the expected lubricating effect, but the lubricating oil is not easy to overflow.

Referring to fig. 4 and 5, the baffle 9 is a labyrinth baffle 90, the overall structure of the labyrinth baffle 90 is similar to the shape of a labyrinth wall, the labyrinth baffle 90 comprises a plate-shaped shielding part 901, and the shielding part 901 is positioned between the flexible bearing 5 and the deep groove ball bearing 7; the one end that is close to input shaft 2 of shielding portion 901 is connected with first connection piece 902, and the one end that is close to steel wheel 4 of shielding portion 901 is connected with second connection piece 903. The first connecting piece 902 has a rectangular structure in cross section, and the thickness of the first connecting piece 902 is larger than the shielding portion 901. The first connecting piece 902 is in interference fit or adhesion with the step surface of the input shaft 2, one side wall of the first connecting piece 902 is abutted against the axial end surface of the input shaft 2, and the other side opposite to the first connecting piece 902 is abutted against the inner ring of the deep groove ball bearing 7, so that the first connecting piece 902 is stably mounted on the input shaft 2.

Referring to fig. 5, the front cover 6 is provided with a groove 61 near the end face of the flexible bearing 5, and the cross section of the second connecting piece 903 is also rectangular in structure, but the integral structure of the second connecting piece 903 and the first connecting piece 902 is different. One end of the second connecting piece 903 extends into the groove 61, so that the path of the lubricating oil blocked by the labyrinth baffle 90 can be prolonged, and the lubricating oil is less likely to overflow out of the speed reducer.

The second connecting piece 903 and the groove 61 are provided with a gap, and the second connecting piece 903 and the groove 61 are in interference-free fit, so that oil overflow in the speed reducer can be reduced, and the input shaft 2 can rotate more smoothly.

Referring to fig. 4, the groove 61 is communicated with the accommodating cavity 8, the part, where the tooth portion 32 of the flexspline 3 is connected with the steel wheel 4, is close to the groove 61, and lubricating oil can enter the groove 61 from the accommodating cavity 8, so that the lubricating oil can infiltrate between the tooth portion 32 and the steel wheel 4, the effect of lubricating the cooperation of the tooth portion 32 and the steel wheel 4 is achieved, and the second connecting piece 903 can effectively block the lubricating oil from overflowing from the groove 61.

Referring to fig. 5, since the speed reducer according to the embodiment of the present application has no oil seal, a baffle ring 71 is fixedly connected to an end surface of the outer ring of the deep groove ball bearing 7 facing away from the baffle plate 9, and a portion of the baffle ring 71 contacts with the inner ring of the deep groove ball bearing 7. The baffle ring 71 can also play a role in blocking lubricating oil, and the arrangement of the baffle ring 71 does not influence the normal rotation of the deep groove ball bearing 7.

The front cover 6 has a flange 62, a stopper ring 71 is adjacent to the flange 62 and is not in contact with the flange 62, a gap is left between the stopper ring 71 and the outer peripheral side of the input shaft 2, the input shaft 2 and the stopper ring 71 are not in contact at all, and the stopper ring 71 is mainly used for stopping lubricating oil.

The implementation principle of the harmonic reducer of the first embodiment of the application is as follows:

The lubricating oil can be contained in the containing cavity 8 between the connecting part 33 and the input shaft 2, the lubricating oil in the speed reducer is more or less, the expected lubricating effect can be achieved, the labyrinth baffle 90 can effectively block the lubricating oil, the second connecting piece 903 of the labyrinth baffle 90 is matched with the groove 61, the blocking area of the labyrinth baffle 90 is enlarged, and the normal operation of the speed reducer is not easily affected when the labyrinth baffle 90 blocks the lubricating oil.

Embodiment two:

Referring to fig. 6 and 7, the second embodiment is different from the first embodiment in that the structure and specific installation position of the flap 9 are different, and the other structures are substantially the same as the first embodiment. The baffle 9 is arranged between the inner ring and the outer ring of the deep groove ball bearing 7, and the baffle 9 is in sliding contact with the inner ring and the outer ring of the deep groove ball bearing 7. Annular mounting grooves are formed in the inner ring and the outer ring of the deep groove ball bearing 7, the part, in which the baffle 9 is mounted, of the mounting grooves is provided with a mounting portion 91, the mounting portion 91 is bent to be of a hook-shaped structure, the contact area between the mounting portion 91 and the inner wall of the mounting grooves is increased, and the baffle 9 is stably mounted in the deep groove ball bearing 7.

The number of the blocking pieces 9 can be two, one blocking piece 9 is positioned in the speed reducer, the other blocking piece 9 is positioned outside the speed reducer, and the balls of the deep groove ball bearing 7 are positioned between the two blocking pieces 9. The two baffle plates 9 can have the effect of double guarantee.

The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.

Claims

1. The utility model provides a harmonic speed reducer, includes base (1) and is located inside input shaft (2) of base (1), its characterized in that: still include flexspline (3) and steel wheel (4), flexspline (3) including be fixed in fixed part (31) on base (1), be tube-shape tooth portion (32) and will fixed part (31) with connecting portion (33) that tooth portion (32) are connected, connecting portion (33) with hold chamber (8) that hold lubricating oil between input shaft (2), steel wheel (4) are located flexspline (3) periphery side, the inner wall of steel wheel (4) with tooth portion periphery side laminating, be provided with flexible bearing (5) between the interior periphery side of tooth portion (32) with cam (21) of input shaft (2), steel wheel (4) are kept away from protecgulum (6) are installed to one end of base (1), protecgulum (6) with be provided with between input shaft (2) ditch ball bearing (7), protecgulum (6) with install between input shaft (2) gap (9) between flexible ball bearing (9) still.

2. A harmonic reducer according to claim 1, characterized in that: the separation blade (9) are maze separation blade (90), maze separation blade (90) including be platelike shelter from portion (901), with shelter from first connection piece (902) and second connection piece (903) that portion (901) are connected at both ends relatively, shelter from portion (901) are located flexible bearing (5) with between deep groove ball bearing (7), first connection piece (902) install in on the step face of input shaft (2), first connection piece (902) with the inner circle butt of deep groove ball bearing (7), second connection piece (903) are close to steel wheel (4).

3. A harmonic reducer according to claim 2, characterized in that: the front cover (6) is provided with a groove (61) close to the end face of the flexible bearing (5), and the second connecting sheet (903) extends into the groove (61).

4. A harmonic reducer according to claim 3, characterized in that: the second connecting piece (903) and the groove (61) are provided with a gap.

5. A harmonic reducer according to claim 2, characterized in that: one end of the outer ring of the deep groove ball bearing (7) deviating from the baffle plate (9) is fixedly connected with a baffle ring (71), and part of the baffle ring (71) is contacted with the inner ring of the deep groove ball bearing (7).

6. A harmonic reducer as defined in claim 5, wherein: the baffle ring (71) is spaced from the input shaft (2).

7. A harmonic reducer according to claim 1, characterized in that: the baffle (9) is arranged between the inner ring and the outer ring of the deep groove ball bearing (7), and the baffle (9) is in sliding contact with the inner ring and the outer ring of the deep groove ball bearing (7).

8. A harmonic reducer as claimed in claim 7, wherein: the number of the baffle plates (9) is two, and the balls of the deep groove ball bearing (7) are positioned between the two baffle plates (9).