CN114645931A - Cycloidal speed reducer with prepressing regulator - Google Patents

Abstract

The invention provides a cycloid speed reducer with a prepressing adjusting device, which comprises an output flange, a rotating shaft, a bearing and the prepressing adjusting device, wherein the output flange is fixedly connected with the rotating shaft; the output flange is provided with an adjusting screw hole, the rotating shaft penetrates through the output flange through an output end, the bearing is provided with an inner ring arranged at the output end of the rotating shaft and an outer ring arranged on the output flange, the prepressing adjusting device is provided with a prepressing plate and an adjusting screw, the prepressing plate is adjacently arranged at the output end of the rotating shaft and is abutted against the outer ring of the bearing, and the adjusting screw is rotationally fixed on the adjusting screw hole of the output flange and is abutted against the prepressing plate through one end of the adjusting screw. Therefore, when the adjusting screw is rotated, the prepressing plate can be pushed by the adjusting screw to further prop against the outer ring of the bearing, so that the prepressing plate applies prepressing force to the bearing.

Description

Cycloidal speed reducer with prepressing regulator

Technical Field

The invention relates to a cycloidal speed reducer, in particular to a cycloidal speed reducer with a pre-pressing adjusting device.

Background

The cycloidal speed reducer works on the principle that power is input from an eccentric shaft and then is transmitted through a tooth difference to achieve the effect of speed reduction output. In order to eliminate the gap and increase the rigidity, a pre-pressure is usually applied to the bearings which are matched with the eccentric shaft, so that the transmission precision of the eccentric shaft is more stable.

In the patent documents JP 201714915 a and JP 5009232B 2, at least one washer is provided in the gap, and the number or size of the washers is adjusted according to the size of the gap, thereby achieving the effect of adjusting the preload of the bearing. However, the method of adjusting the preload by the washer not only increases the difficulty in assembly, but also causes a problem of increase in axial volume.

Disclosure of Invention

The invention mainly aims to provide a cycloid speed reducer which is easy to assemble and convenient to adjust the pre-pressure applied to a bearing, and does not have the problem of increasing the axial volume.

In order to achieve the main object, the cycloidal reducer of the present invention comprises a housing, a rotating shaft, an input flange, a first bearing, an output flange, a second bearing, a speed reducer, and a preload adjusting device. The rotating shaft is rotatably arranged in the shell in a penetrating way and is provided with an input end and an output end, the input end is provided with a first shoulder, and the output end is provided with a second shoulder; the input flange is arranged at one end of the shell and sleeved at the input end of the rotating shaft; the first bearing is provided with a first inner ring and a first outer ring, the first inner ring is sleeved on the input end of the rotating shaft and abuts against the first shoulder part of the rotating shaft, and the second outer ring abuts against the input flange through the outer ring surface of the second outer ring; the output flange is arranged at the other end of the shell and sleeved on the output end of the rotating shaft, and the output flange is provided with an adjusting screw hole; the second bearing is provided with a second inner ring and a second outer ring, the second inner ring is sleeved on the output end of the rotating shaft and abuts against the second shoulder of the rotating shaft, and the outer ring surface of the second outer ring abuts against the output flange; the speed reducer is provided with at least one cycloidal gear and at least one Oldham coupling, the cycloidal gear is eccentrically sleeved with the rotating shaft, and the Oldham coupling is arranged between the cycloidal gear and the input flange or the output flange; the prepressing adjusting device is provided with a prepressing plate and an adjusting screw, the prepressing plate is arranged at the output end of the rotating shaft in an abutting mode and abutted to the second outer ring of the second bearing, the adjusting screw is rotationally fixed to the adjusting screw hole of the output flange, one end of the adjusting screw abuts against the prepressing plate, when the adjusting screw is rotated, the prepressing plate can be pushed by the adjusting screw to abut against the second outer ring of the second bearing, and therefore prepressing force is applied to the second bearing.

Therefore, the cycloid speed reducer can quickly and conveniently adjust the pre-pressure of the second bearing, is relatively simple in assembly and relatively easy in processing, and does not increase the axial volume of the whole structure.

Optionally, the pre-pressing adjusting device further comprises an anti-rotation nut, and the anti-rotation nut is rotationally fixed to the adjusting screw and abuts against the outer side surface of the output flange to prevent the adjusting screw from being turned reversely and loosened.

Optionally, the inner side surface of the output flange has a receiving groove, the receiving groove receives the output end of the rotating shaft, the second bearing and the pre-pressing plate, a sealing element is disposed on the outer periphery of the pre-pressing plate, and the sealing element abuts against the groove wall of the receiving groove to prevent the internal lubricating oil from leaking outside.

Optionally, a side of the pre-pressing plate facing the rotating shaft has an annular flange, and the pre-pressing plate abuts against the second outer ring of the second bearing with the annular flange.

Optionally, the output flange further has a countersunk head screw hole, a long groove is formed in a side surface of the pre-pressing plate facing the output flange, and the pre-pressing adjusting device further has an anti-rotation screw which is rotationally fixed to the countersunk head screw hole and one end of which is inserted into the long groove to prevent the pre-pressing plate from rotating.

Optionally, the output flange further has a counter bore, the prepressing plate has an anti-rotation screw hole towards one side of the output flange, and the prepressing adjustment device further has an anti-rotation screw, the anti-rotation screw is inserted into the counter bore and is rotationally fixed to the anti-rotation screw hole at one end thereof, so as to prevent the prepressing plate from rotating.

Optionally, an inner side surface of the output flange further has an anti-rotation groove, a side surface of the pre-pressing plate facing the output flange has an anti-rotation protrusion, and the anti-rotation groove of the output flange and the pre-pressing plate are mutually clamped by the anti-rotation protrusion to prevent the pre-pressing plate from rotating.

Optionally, the adjusting screw pushes the pre-pressing plate by using a propping end, and the propping end can be conical or planar.

Optionally, the adjusting screw hole is located at the midpoint of the output flange, so that the stress of the pre-pressing plate can be averaged.

The detailed structure, characteristics, assembly, or use of the cycloid speed reducer having the preload adjusting device according to the present invention will be described in detail in the following embodiments. However, it will be understood by those skilled in the art that the detailed description and specific examples, while indicating the specific embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.

Drawings

Fig. 1 is a perspective view of a cycloidal reducer according to a first embodiment of the present invention.

Fig. 2 is a partial exploded perspective view of fig. 1.

Fig. 3 is a perspective view of the cycloidal reducer according to the first embodiment of the present invention from another viewing angle.

Fig. 4 is a partial exploded perspective view of fig. 3.

Fig. 5 is a combined sectional view of a cycloidal reducer according to a first embodiment of the present invention.

Fig. 6 is a sectional view showing a cycloid speed reducer according to the first embodiment of the present invention with a seal member attached thereto.

Fig. 7 is a perspective view of a cycloidal reducer according to a second embodiment of the present invention.

Fig. 8 is a partial exploded perspective view of fig. 7.

Fig. 9 is a sectional view of a cycloid speed reducer according to a second embodiment of the present invention.

Fig. 10 is a partially exploded perspective view of a cycloidal reducer according to a third embodiment of the present invention.

Fig. 11 is a combined sectional view of a cycloid speed reducer according to a third embodiment of the present invention.

Fig. 12 is a partially exploded perspective view of a cycloidal reducer according to a fourth embodiment of the present invention.

Fig. 13 is a sectional view of a cycloid speed reducer according to a fourth embodiment of the present invention.

Description of the symbols:

10: cycloidal speed reducer

12: bolt

20: shell body

30: rotating shaft

32: input terminal

34: output end

36: first shoulder

38: second shoulder

40: input flange

42: shaft hole

44: inner shoulder

46: first connecting post

50: first bearing

51: a first inner ring

52: a first outer ring

53: first ball

60: output flange

61: containing groove

62: adjusting screw hole

63: second connecting column

64: countersunk screw hole

65: countersunk hole

66: anti-rotation groove

70: second bearing

71: second inner ring

72: second outer ring

73: second ball

80: speed reducer

81: cycloid wheel

82: oudan coupling

83: needle roller

90: prepressing adjusting device

91: pre-pressing plate

911: first surface

912: second surface

913: annular flange

914: elongated slot

915: anti-rotation screw hole

916: anti-rotation lug

92: adjusting screw

93: abutting end

94: anti-rotation nut

95: anti-rotation screw

96: sealing element

Detailed Description

In the description, including the embodiments described below and claims, directional terms used throughout this specification are used with reference to the illustrated directions. Next, in the embodiments and drawings to be described below, the same element numbers denote the same or similar elements or structural features thereof.

Referring to fig. 1 to 5, a cycloidal reducer 10 according to a first embodiment of the present invention includes a housing 20, a rotating shaft 30, an input flange 40, a first bearing 50, an output flange 60, a second bearing 70, a speed reducer 80, and a preload adjusting device 90.

The shaft 30 is disposed through the housing 20 and can be driven by a power source (e.g., a motor, not shown) to rotate. The shaft 30 has an input end 32 and an output end 34. as shown in fig. 4, the input end 32 has a first shoulder 36 on the outer circumference thereof and the output end 34 has a second shoulder 38 on the outer circumference thereof.

The input flange 40 is assembled to one end of the housing 20. The input flange 40 has a shaft hole 42 in the center, the input flange 40 is sleeved on the input end 32 of the shaft 30 by the shaft hole 42, the shaft hole 42 has an inner shoulder 44 (as shown in fig. 5), and the inner side surface of the input flange 40 has four first connecting posts 46 around the shaft hole 42.

The first bearing 50 (an angular contact bearing is taken as an example, but not limited to) has a first inner ring 51, a first outer ring 52 and a plurality of first balls 53 disposed between the first inner ring 51 and the first outer ring 52. As shown in fig. 5, the first inner ring 51 is disposed on the input end 32 of the shaft 30 and abuts against the first shoulder 36 of the shaft 30, and the first outer ring 52 abuts against the inner shoulder 44 of the input flange 40 and abuts against the hole wall of the shaft hole 42 with its outer ring surface. Thereby, the rotary shaft 30 and the input flange 40 rotate relative to each other via the first bearing 50.

An output flange 60 is provided at the other end of the housing 20. The inner peripheral surface of the output flange 60 has a receiving groove 61, the output flange 60 is sleeved on the output end 34 of the rotating shaft 30 by the receiving groove 61, the inner peripheral surface of the output flange 60 has four second connecting columns 63 around the receiving groove 61, and the four first connecting columns 46 of the input flange 40 and the four second connecting columns 63 of the output flange 60 are connected by four bolts 12 to be assembled together. In addition, the output flange 60 has an adjustment screw hole 62 at the center thereof, which communicates with the receiving groove 61.

The second bearing 70 (an angular contact bearing is taken as an example, but not limited thereto) is disposed in the receiving groove 61 and has a second inner ring 71, a second outer ring 72, and a plurality of second balls 73 disposed between the second inner ring 71 and the second outer ring 72. The second inner ring 71 is sleeved on the output end 34 of the shaft 30 and abuts against the second shoulder 38 of the shaft 30, and the outer ring surface of the second outer ring 72 abuts against the groove wall of the accommodating groove 61. Thereby, the rotary shaft 30 and the output flange 60 are relatively rotated by the second bearing 70.

The reduction gear 80 includes two cycloid gears 81, two Oldham couplings 82, and a plurality of needle rollers 83. The two cycloidal gears 81 are mutually parallel and are sleeved at the center of the rotating shaft 30 in an eccentric mode, and the two cycloidal gears 81 are commonly penetrated and arranged by the four second connecting columns 63 of the output flange 60; one Oldham coupling 82 is arranged between the input flange 40 and the cycloidal gears 81, and the other Oldham coupling 82 is arranged between the output flange 60 and the cycloidal gears 81; the plurality of needle rollers 83 are provided between the inner peripheral surface of the housing 20 and the outer peripheral surface of the cycloid gears 81, and allow the cycloid gears 81 to operate stably. Therefore, when the two cycloidal gears 81 are driven by the rotating shaft 30, cycloidal rotation is generated relative to the housing 20, and then the input flange 40 and the output flange 60 are linked through the Oldham coupling 82, so that the input flange 40 and the output flange 60 achieve the effect of speed reduction rotation.

The preload adjusting device 90 has a preload plate 91 and an adjusting screw 92 in this embodiment. As shown in fig. 5, the pre-pressing plate 91 is disposed in the receiving groove 61 of the output flange 60 and adjacent to the output end 34 of the rotating shaft 30, the pre-pressing plate 91 has a first surface 911 and a second surface 912 opposite to the first surface 911, wherein the first surface 911 has an annular flange 913, and the pre-pressing plate 91 abuts against the second outer ring 72 of the second bearing 70 with the annular flange 913; the adjusting screw 92 is rotatably fixed to the adjusting screw hole 62 of the output flange 60 and abuts against the second surface 912 of the pre-pressing plate 91 with one abutting end 93 thereof. Therefore, when the adjusting screw 92 is rotated, the pre-pressure plate 91 is pushed by the adjusting screw 92 to push against the second outer ring 72 of the second bearing 70, so as to apply pre-pressure to the second bearing 70, and transmit the force to the first bearing 50 through the second balls 73, the second inner ring 71, the second shoulder 38 of the rotating shaft 30, and the first shoulder 36 of the rotating shaft 30 in sequence, so that the pre-pressure of the first bearing 50 is also adjusted.

In order to prevent the adjusting screw 92 from being reversely loosened, the pre-pressure adjusting device 90 in this embodiment provides an anti-rotation nut 94, and after the pre-pressure adjustment is completed, the anti-rotation nut 94 is locked on the adjusting screw 92 and abuts against the outer side surface of the output flange 60, so as to ensure the fixing of the adjusting screw 92.

As shown in fig. 6, in order to prevent the lubricant inside from leaking, a sealing element 96 may be provided on the outer periphery of the pre-pressing plate 91, and the sealing element 96 may abut against the groove wall of the accommodating groove 61 to increase the sealing effect.

In addition, in order to prevent the preload plate 91 from rotating and affecting the preload applied to the second bearing 70, the present invention provides different solutions in the following embodiments.

Referring to fig. 7 to 9, in the second embodiment of the present invention, the second surface 912 of the pre-pressing plate 91 has two long slots 914, the output flange 60 is provided with a countersunk screw hole 64 above and below the adjusting screw hole 62, and is rotatably fixed to the two countersunk screw holes 64 by two rotation-preventing screws 95, and one end of each rotation-preventing screw is inserted into the two long slots 914, so as to achieve the effect of preventing the pre-pressing plate 91 from rotating.

Referring to fig. 10 to 11, in the third embodiment of the present invention, the second surface 912 of the pre-pressing plate 91 has two anti-rotation screw holes 915, the output flange 60 has a countersunk hole 65 without threads above and below the adjustment screw hole 62, and two anti-rotation screws 95 are inserted into the countersunk hole 65 and are rotatably fixed in the two anti-rotation screw holes 915 at one end thereof, so as to achieve the effect of preventing the pre-pressing plate 91 from rotating.

Referring to fig. 12 and 13, in the fourth embodiment of the present invention, the second surface 912 of the pre-pressing plate 91 has two anti-rotation protrusions 916, the output flange 60 has two anti-rotation grooves 66 above and below the adjustment screw hole 62, and the pre-pressing plate 91 is clamped in the two anti-rotation grooves 66 of the output flange 60 by the two anti-rotation protrusions 916, so as to achieve the effect of preventing the pre-pressing plate 91 from rotating.

Finally, it should be added that the abutting end 93 of the adjusting screw 92 can be represented in a conical form (as shown in fig. 5, 6 and 9), so that a point contact is formed between the adjusting screw 92 and the pre-pressing plate 91; alternatively, the adjusting screw 92 may be formed in a planar shape (as shown in fig. 11 and 13) so as to be in surface contact with the pre-press plate 91. In either way, the preload plate 91 can apply a stable and even preload to the second bearing 70 under the urging of the adjustment screw 92.

As described above, the cycloid speed reducer 10 according to the present invention can quickly and easily adjust the preload applied to the second bearing 70 by the engagement of the preload plate 91 and the adjustment screw 92, and is relatively simple in assembly and easy in machining, and does not have a washer used in the related art, so that the axial volume of the overall structure is not increased.

Claims (10)

1. A cycloidal reducer with a pre-pressing adjusting device comprises:

a housing;

a rotating shaft rotatably arranged in the shell in a penetrating way and provided with an input end and an output end, wherein the input end is provided with a first shoulder part, and the output end is provided with a second shoulder part;

the input flange is arranged at one end of the shell and sleeved at the input end of the rotating shaft;

the first bearing is provided with a first inner ring and a first outer ring, the first inner ring is sleeved on the input end of the rotating shaft and abuts against the first shoulder of the rotating shaft, and the outer ring surface of the second outer ring abuts against the input flange;

the output flange is arranged at the other end of the shell and sleeved at the output end of the rotating shaft, and the output flange is provided with an adjusting screw hole;

a second bearing having a second inner ring and a second outer ring, the second inner ring being sleeved on the output end of the rotating shaft and abutting against the second shoulder of the rotating shaft, an outer ring surface of the second outer ring abutting against the output flange;

the speed reducer is provided with at least one cycloidal gear and at least one Oldham coupling, the cycloidal gear is eccentrically sleeved with the rotating shaft, and the Oldham coupling is arranged between the cycloidal gear and the input flange or the output flange; and

and the prepressing adjusting device is provided with a prepressing plate and an adjusting screw, the prepressing plate is adjacently arranged at the output end of the rotating shaft and is abutted against the second outer ring of the second bearing, the adjusting screw is rotationally fixed on the adjusting screw hole of the output flange, and one end of the adjusting screw is abutted against the prepressing plate, so that the prepressing plate can be pushed by the adjusting screw to be abutted against the second outer ring of the second bearing, and the prepressing is further applied to the second bearing.

2. The cycloidal reducer according to claim 1, wherein the preload adjustment device further comprises an anti-rotation nut rotatably fixed to the adjustment screw and abutting an outer side surface of the output flange.

3. The cycloidal reducer according to claim 1, wherein an inner side surface of the output flange has a receiving groove, the receiving groove receives the output end of the rotating shaft, the second bearing and the pre-pressing plate, an outer periphery of the pre-pressing plate has a ring groove, and a sealing element is disposed in the ring groove and abuts against a groove wall of the receiving groove.

4. The cycloidal reducer according to claim 1, wherein a side of the pre-pressing plate facing the rotating shaft has an annular flange, and the pre-pressing plate abuts against the second outer ring of the second bearing with the annular flange.

5. The cycloidal reducer according to claim 1, wherein the output flange further comprises a countersunk screw hole, the pre-pressing plate has an elongated slot on a side surface facing the output flange, and the pre-pressing adjusting device further comprises an anti-rotation screw rotatably fixed to the countersunk screw hole and having one end inserted into the elongated slot.

6. The cycloidal reducer according to claim 1, wherein the output flange further has a counter bore, the pre-pressing plate has an anti-rotation screw hole toward a side of the output flange, and the pre-pressing adjusting device further has an anti-rotation screw passing through the counter bore and having one end rotatably fixed to the anti-rotation screw hole.

7. The cycloidal reducer according to claim 1, wherein the output flange further comprises an anti-rotation groove, the pre-pressing plate comprises an anti-rotation protrusion, and the anti-rotation protrusion of the pre-pressing plate and the anti-rotation groove of the output flange are engaged with each other.

8. The cycloidal reducer according to claim 1, wherein the adjusting screw has a conical abutting end, and the adjusting screw abuts the pre-pressing plate with the abutting end.

9. The cycloidal reducer according to claim 1 wherein the adjusting screw has a planar abutting end, the adjusting screw abutting the pre-pressing plate with the abutting end.

10. The cycloidal reducer of claim 1 wherein the adjustment screw is located at the midpoint of the output flange.

Images