CN116765897A - Roller cam transmission mechanism and horizontal turntable - Google Patents

Abstract

The invention relates to a roller cam transmission mechanism and a horizontal turntable, wherein the transmission mechanism comprises a turret, a first cam shaft and a second cam shaft; a plurality of needle bearings are arranged on the turret; the first cam shaft and the second cam shaft synchronously rotate, the second cam shaft is parallel to the first cam shaft, and is symmetrically arranged on two opposite sides of the rotating shaft center of the turret with the first cam shaft, and the needle bearings are meshed with the curved surfaces of the first cam shaft and the second cam shaft; the rotation directions of the first cam shaft and the second cam shaft are the same, and the spiral directions of the curved surfaces of the first cam shaft and the second cam shaft are opposite. The roller cam transmission mechanism and the two ends of the turret of the horizontal turntable are symmetrically stressed in transmission, so that the stability and rigidity of the turntable can be improved, the phenomenon of eccentricity of the turntable is avoided, the corner error caused by reverse clearance of a transmission chain can be reduced when the turntable is replaced in the forward and reverse directions, and the rotation precision of the turntable can be improved.

Description

Roller cam transmission mechanism and horizontal turntable

Technical Field

The invention relates to the technical field of numerical control machine tools, in particular to a roller cam transmission mechanism and a horizontal turntable.

Background

As shown in fig. 1, a conventional horizontal roller cam turntable generally has a turret 100 and a cam shaft 200 which are perpendicular to each other in the axial direction, an output flange 300 is mounted at the front end of the turret 100, a plurality of needle bearings 400 are mounted on the side arc surface of the turret 100 in an equally divided manner, the needle bearings 400 extend radially along the turret 100, and the needle bearings 400 are engaged with the curved surface of the cam shaft 200 without backlash. The motor drives the cam shaft 200 to rotate through gear transmission, so as to drive the turret 100 to rotate, and finally, the workpiece is driven to rotate through the output flange 300.

Because the existing roller cam horizontal turntable is a single-group camshaft 200 for driving the turret 100, the problems of asymmetric stress and eccentricity can be caused, and when the camshaft 200 is driven to rotate, the turntable can be caused to have larger rotation angle errors reflected to the turntable when the turntable is in forward and reverse rotation alternation due to the existence of reverse gaps of a gear transmission chain, so that the long-term operation precision of the turntable is deteriorated.

In addition, the needle roller bearing 400 of the roller cam horizontal turntable is mounted on the side arc surface of the turret 100 and extends in the radial direction, and the whole mechanism occupies a large space. In addition, the structure has higher requirements on the indexing accuracy of the turntable, is difficult to process and has higher production cost. Further, the needle bearing 400 is mounted farther from the rotation axis of the turret 100, and is weak in rigidity and easily deformed.

Disclosure of Invention

In view of the above, the technical problem to be solved by the invention is to provide a roller cam transmission mechanism and a horizontal turntable with higher stability and rotation precision.

In order to solve the technical problems, an embodiment of the invention provides a roller cam transmission mechanism, which comprises a turret and a first cam shaft; the turret is provided with a turret rotation axis, the turret can rotate around the turret rotation axis, and a plurality of needle bearings are arranged on the turret; the first cam shaft is provided with a first cam shaft rotation axis which is perpendicular to the turret rotation axis, a space is reserved between the first cam shaft and the turret rotation axis, the first cam shaft is provided with a curved surface which is spirally arranged, and the needle roller bearing is connected with the curved surface of the first cam shaft in a meshed mode; the transmission mechanism further comprises a second cam shaft which can synchronously rotate with the first cam shaft, the second cam shaft is parallel to the first cam shaft and symmetrically arranged on two opposite sides of the rotating shaft center of the turret with the first cam shaft, the second cam shaft is provided with a second cam shaft rotating shaft center, the second cam shaft rotating shaft center is parallel to the first cam shaft rotating shaft center and perpendicular to the rotating shaft center of the turret, a space is reserved between the second cam shaft and the rotating shaft center of the turret, the second cam shaft is provided with a spirally arranged curved surface, and the needle bearing is in meshed connection with the curved surface of the second cam shaft; the rotation directions of the first cam shaft and the second cam shaft are the same, and the spiral directions of the curved surfaces of the first cam shaft and the second cam shaft are opposite.

Further, the needle bearings are mounted on end surfaces of the turret adjacent to the first and second cam shafts, and extend in the direction of the rotational axis of the turret.

Further, the needle bearings are evenly distributed around the turret rotation axis.

The invention also provides a horizontal turntable, which comprises the roller cam transmission mechanism, a box body, a mandrel, a turntable bearing and an output flange, wherein the transmission mechanism is arranged on the box body, the mandrel penetrates through the turret along the extending direction of the rotating axis of the turret, one end of the mandrel is locked on the box body, the turntable bearing is sleeved on the mandrel, the turntable bearing comprises a bearing inner ring and a bearing outer ring, the bearing inner ring is tightly matched on the mandrel, the bearing outer ring is fixedly connected with the turret, and the output flange is fixedly connected on the other end face of the turret, which is far away from the first camshaft and the second camshaft.

Further, the horizontal turntable further comprises a motor, a motor gear and two transmission gears, wherein the two transmission gears are coaxially arranged on the first cam shaft and the second cam shaft respectively, the motor gear is meshed between the two transmission gears, the motor is arranged on the box body, and an output shaft of the motor is in transmission connection with the motor gear.

Further, a brake ring is arranged between the box body and the output flange, and the brake ring is fixed on the box body.

Further, a sealing ring is further arranged between the box body and the output flange, an inner ring of the sealing ring is fixed with the brake ring in a sealing manner, and an outer ring of the sealing ring is in contact friction with the output flange.

Further, the sealing ring is a V-shaped water seal.

Further, the first camshaft, the second camshaft pass through multiunit camshaft adjustment subassembly with bearing zero clearance contact, multiunit camshaft adjustment subassembly be located respectively first, second camshaft's both ends, every camshaft adjustment subassembly of group includes tapered roller bearing, eccentric flange and round nut, tapered roller bearing and round nut all overlap and locate the tip of first, second camshaft, just the round nut is located tapered roller bearing's outside, eccentric flange cover is located on the round nut.

Further, scales are uniformly arranged on the eccentric flange along the circumferential direction.

Compared with the prior art, the roller cam transmission mechanism and the horizontal turntable are symmetrically provided with the first cam shaft and the second cam shaft at the opposite sides of the rotating shaft center of the turret, and the rotation directions of the first cam shaft and the second cam shaft are the same, and the spiral directions of the curved surfaces are opposite, so that the transmission stress at the two ends of the turret is symmetrical, the stability and the rigidity of the turntable can be improved, the eccentric phenomenon of the turntable is avoided, the corner error caused by the reverse clearance of a transmission chain can be reduced when the turntable is replaced positively and negatively, and the rotation precision of the turntable can be improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the embodiments of the present invention, and other drawings may be obtained according to these drawings for a person having ordinary skill in the art.

Fig. 1 is a schematic view of a conventional roller cam horizontal turntable.

Fig. 2 is a schematic view of the structure of the horizontal turntable in the present invention.

Fig. 3 is a schematic longitudinal sectional view of the embodiment shown in fig. 2.

Fig. 4 is another longitudinal cross-sectional schematic view of the embodiment shown in fig. 2.

Detailed Description

In order to better understand the technical solutions in the embodiments of the present invention, the following description will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the present invention, shall fall within the scope of protection of the embodiments of the present invention.

The roller cam transmission mechanism and the horizontal turntable can be applied to a numerical control horizontal machining center, and rotate workpieces to carry out linkage and directional machining in the machining process, and are mainly used for machining complex parts such as middle and large-sized boxes, plates, discs, valves, shells and the like in various small and medium batches.

Referring to fig. 2 to 4, the roller cam transmission mechanism according to a preferred embodiment of the present invention includes a turret 1, a first cam shaft 2 and a second cam shaft 3. The turret 1 has a turret rotation axis I about which the turret 1 is rotatable, and a plurality of needle bearings 101 are provided on the turret 1. The first cam shaft 2 is provided with a first cam shaft rotation axis II which is perpendicular to the turret rotation axis I and has a distance from the turret rotation axis I; the first cam shaft 2 has a curved surface 201 spirally provided thereon, and the needle bearing 101 is engaged with the curved surface 201 connected to the first cam shaft 2. The second cam shaft 3 is parallel to the first cam shaft 2 and is symmetrically arranged on two opposite sides of the rotating shaft center I of the turret with the first cam shaft 2; the second cam shaft 3 has a second cam shaft rotation axis III which is parallel to the first cam shaft rotation axis II and perpendicular to the turret rotation axis I, and a space is also provided between the second cam shaft rotation axis III and the turret rotation axis I; the second cam shaft 3 has a curved surface 301 which is spirally provided, and the needle bearing 101 is engaged with the curved surface 301 which is connected to the second cam shaft 3. The rotation directions of the first and second camshafts 2, 3 are the same, and the spiral directions of the curved surfaces 201, 301 thereof are opposite.

In the above embodiment, by adding the second cam shaft 3 with the rotation direction opposite to the first cam shaft 2 on the other side of the rotation axis I of the turret, the transmission stress at the two ends can be symmetrical, so that the stability and rigidity of the turntable can be improved, and the eccentric phenomenon of the turntable can be avoided.

Further, needle bearings 101 are mounted on end faces 102 of the turret 1 adjacent to the first and second cam shafts 2, 3 and extend in the direction of the turret rotation axis I, and the needle bearings 101 are uniformly distributed around the turret rotation axis I. In the embodiment, the conventional turret radial roller bearing mounting mode is changed into an end surface roller mounting transmission mode, so that the space can be saved, the pitch circle of the needle roller bearing 101 can be increased, the indexing accuracy and rigidity of the turntable are improved, and the processing difficulty of parts of the turret 1 and the first and second camshafts 2 and 3 is reduced, so that the production cost can be reduced. The needle bearing 101 is located closer to the turret rotation axis I, and has high rigidity and is not easily deformed.

The horizontal turntable comprises the roller cam transmission mechanism, a box body 4, a mandrel 5, a turntable bearing 6 and an output flange 7. The transmission mechanism is arranged on the box body 4, the mandrel 5 penetrates through the turret 1 along the extending direction of the turret rotation shaft I, and one end of the mandrel is locked on the box body 4 through a screw. The turntable bearing 6 is sleeved on the mandrel 5 and comprises a bearing inner ring 601 and a bearing outer ring 602, the bearing inner ring 601 is connected to the bearing outer ring 602 through balls, the bearing inner ring 601 is tightly matched on the mandrel 5, the bearing outer ring 602 is fixedly connected with the turret 1, and the output flange 7 is fixedly connected to the other end face of the turret 1, which is far away from the first camshaft 2 and the second camshaft 3.

When the power drives the first and second camshafts 2, 3 to rotate synchronously, the first and second camshafts 2, 3 can drive the turret 1 to rotate around the turret rotation axis I through the cooperation of the curved surfaces 201, 301 and the needle bearings 101, so as to drive the output flange 7 to rotate.

In this embodiment, the horizontal turntable further comprises a motor 8, a motor gear 9 and two transmission gears 10. Two transmission gears 10 are coaxially arranged on the first and second camshafts 2 and 3 respectively, a motor gear 9 is meshed between the two transmission gears 10, a motor 8 is arranged on the box body 4, and an output shaft of the motor 8 is in transmission connection with the motor gear 9. The motor gear 9 is driven to rotate by the motor 8, and the motor gear 9 further drives the first and second camshafts 2 and 3 to synchronously rotate. The motor 8 can be a servo motor, and the motor 8 drives the first cam shaft 2 and the second cam shaft 3 simultaneously, so that the rotation angle error caused by reverse clearance of the gear can be reduced when the turntable is replaced positively and negatively, and the rotation precision of the turntable can be improved.

In addition, a brake ring 11 and a sealing ring 12 are arranged between the box body 4 and the output flange 7. The brake ring 11 is fixed on the box body 4, the sealing ring 12 can be a V-shaped water seal, the inner ring of the sealing ring is fixed with the brake ring 11 in a sealing way, and the outer ring of the sealing ring is in contact friction with the output flange 7 to play a role in rotary sealing.

In this embodiment, the first and second camshafts 2, 3 are in zero-clearance contact with the needle bearing 101 via the plural sets of camshaft adjustment assemblies 13. A plurality of sets of camshaft adjustment assemblies 13 are located at both ends of the first and second camshafts 2, 3, respectively. Each set of camshaft adjustment assemblies 13 includes tapered roller bearings 131, eccentric flanges 132, and round nuts 133. Tapered roller bearing 131 and round nut 133 are both sleeved on the end parts of first and second camshafts 2, 3, and round nut 133 is located outside tapered roller bearing 131, and eccentric flange 132 is sleeved on round nut 133. The eccentric flange 132 is uniformly provided with scales along the circumferential direction, and when the eccentric flange 132 is rotated, the debugging position can be judged from the scales.

The transmission mechanism and the horizontal turntable are symmetrically provided with the first camshaft 2 and the second camshaft 3 on two opposite sides of the rotating shaft center I of the turret, and the rotation directions of the first camshaft 2 and the second camshaft 3 are the same, and the spiral directions of the curved surfaces 201 and 301 are opposite, so that the transmission stress at two ends of the turret is symmetrical, the stability and the rigidity of the turntable can be improved, the phenomenon of eccentricity of the turntable is avoided, the corner error caused by the reverse clearance of the transmission chain is reduced when the turntable is replaced in the forward and reverse directions, and the rotation precision of the turntable can be improved.

Secondly, the transmission mechanism and the horizontal turntable adopt an end surface roller mounting transmission mode, so that the space can be saved, the pitch circle distributed by the needle bearing 101 can be increased, the indexing accuracy and rigidity of the turntable are improved, the processing difficulty of parts of the turret 1 and the first and second camshafts 2 and 3 is reduced, and the production cost can be reduced. The needle bearing 101 is located closer to the turret rotation axis I, and has high rigidity and is not easily deformed.

The embodiments described above are merely preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the embodiments described above, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principles of the present invention should be considered as equivalent substitutions within the scope of the present invention.

Claims (10)

1. A roller cam transmission mechanism comprises a turret and a first cam shaft; the turret is provided with a turret rotation axis, the turret can rotate around the turret rotation axis, and a plurality of needle bearings are arranged on the turret; the first cam shaft is provided with a first cam shaft rotation axis which is perpendicular to the turret rotation axis, a space is reserved between the first cam shaft and the turret rotation axis, the first cam shaft is provided with a curved surface which is spirally arranged, and the needle roller bearing is connected with the curved surface of the first cam shaft in a meshed mode; the transmission mechanism is characterized by further comprising a second cam shaft which can synchronously rotate with the first cam shaft, wherein the second cam shaft is parallel to the first cam shaft and symmetrically arranged on two opposite sides of the rotating shaft center of the turret with the first cam shaft, the second cam shaft is provided with a second cam shaft rotating shaft center, the second cam shaft rotating shaft center is parallel to the first cam shaft rotating shaft center and perpendicular to the rotating shaft center of the turret, a space is reserved between the second cam shaft rotating shaft center and the rotating shaft center of the turret, the second cam shaft is provided with a curved surface which is spirally arranged, and the needle bearing is meshed with the curved surface of the second cam shaft; the rotation directions of the first cam shaft and the second cam shaft are the same, and the spiral directions of the curved surfaces of the first cam shaft and the second cam shaft are opposite.

2. The roller cam mechanism of claim 1, wherein said needle bearings are mounted on end surfaces of said turret adjacent to said first and second camshafts and extend in the direction of the rotational axis of said turret.

3. The roller cam mechanism of claim 2, wherein the needle bearings are evenly distributed about the turret rotational axis.

4. The horizontal turntable is characterized by comprising the roller cam transmission mechanism, a box body, a mandrel, a turntable bearing and an output flange which are all arranged on the box body, wherein the mandrel penetrates through the turret along the extending direction of the rotating axis of the turret, one end of the mandrel is locked on the box body, the turntable bearing is sleeved on the mandrel and comprises a bearing inner ring and a bearing outer ring, the bearing inner ring is tightly matched on the mandrel, the bearing outer ring is fixedly connected with the turret, and the output flange is fixedly connected on the other end face, far away from the first camshaft and the second camshaft, of the turret.

5. The horizontal turntable of claim 4, further comprising a motor, a motor gear and two transmission gears, wherein the two transmission gears are coaxially mounted on the first and second camshafts, the motor gear is meshed between the two transmission gears, the motor is mounted on the box, and an output shaft of the motor is in transmission connection with the motor gear.

6. The horizontal turret of claim 4 wherein a brake ring is disposed between the housing and the output flange, the brake ring being secured to the housing.

7. The horizontal turntable of claim 6, wherein a sealing ring is further arranged between the box body and the output flange, an inner ring of the sealing ring is fixed with the brake ring in a sealing manner, and an outer ring of the sealing ring is in contact friction with the output flange.

8. The horizontal turret of claim 7 wherein the seal ring is a V-seal.

9. The horizontal turntable of claim 4, wherein the first and second camshafts are in zero-clearance contact with the needle bearing through a plurality of groups of camshaft adjustment assemblies, the plurality of groups of camshaft adjustment assemblies are respectively positioned at two ends of the first and second camshafts, each group of camshaft adjustment assemblies comprises a tapered roller bearing, an eccentric flange and a round nut, the tapered roller bearing and the round nut are respectively sleeved at the end parts of the first and second camshafts, the round nut is positioned at the outer side of the tapered roller bearing, and the eccentric flange is sleeved on the round nut.

10. The horizontal turntable of claim 9, wherein the eccentric flange is uniformly provided with graduations in a circumferential direction.