CN210770120U - Transmission rod for transmission device - Google Patents
Transmission rod for transmission device Download PDFInfo
- Publication number
- CN210770120U CN210770120U CN201920911707.6U CN201920911707U CN210770120U CN 210770120 U CN210770120 U CN 210770120U CN 201920911707 U CN201920911707 U CN 201920911707U CN 210770120 U CN210770120 U CN 210770120U
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- rolling
- rod
- worm wheel
- screw channel
- rod body
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Abstract
The utility model relates to a transfer line for transmission, at least including the screw channel on the body of rod, worm wheel and the body of rod, the rolling element of worm wheel support lean on in on the screw channel, wherein: under the condition that the rolling body rotates around the center of the worm wheel, the rolling body drives the rod body to rotate in a mode of being in partial line contact with the screw channel. The utility model discloses a set up rolling element and spiral shell way and make the rolling element drive the body of rod and rotate according to the mode with spiral shell way local line contact, sliding friction between the meshing surface of traditional transmission converts the rolling friction between the meshing surface into, very big reduction the frictional force between the meshing surface, thereby make the user can need not consider the teeth of a cogwheel friction expansion of generating heat and the dead problem of card, namely the user need not set up the meshing side gap and die in order to prevent the teeth of a cogwheel card, the accumulative error that the meshing gap leads to has been avoided, entire system's transmission precision has been promoted greatly, position accuracy and dynamic response characteristic.
Description
Technical Field
The utility model relates to the field of mechanical equipment, especially, relate to a transfer line for transmission.
Background
The worm transmission is used for occasions with two crossed shafts, large transmission ratio, small transmission power or intermittent work, has the advantages of stable transmission, low noise, small impact load, self-locking property and the like, and is widely applied to industries such as national defense, metallurgy, shipbuilding, construction, chemical engineering and the like as an important transmission mode in mechanical transmission. However, the common worm drive generally has the following significant disadvantages:
in order to form a lubricating oil film between meshed tooth profiles and avoid the clamping caused by the friction and the thermal expansion of the gear teeth, a gap is required to be reserved between two non-working tooth profiles of conjugate teeth of the common worm drive, and the gap is called a tooth side gap, which is called a backlash for short. This backlash is normally used to store lubricating oil and to compensate for thermal variations, elastic deformations, manufacturing and mounting errors, etc. which occur in the drive in order to ensure proper meshing of the worm gear and the drive. However, in a transmission requiring forward and reverse rotation, the presence of backlash causes backlash shock and affects the smoothness of the gear transmission.
The wear of the common worm transmission is easy to occur in the transmission process, and the reason is that the relative movement speed of the transmission pair at the conjugate tooth surface is always greater than the circumferential speed of the worm or the circumferential speed of the worm wheel, so that the relative speed of the contact point at any position is not zero and is always in a sliding friction state, namely, the meshing gears have a larger relative sliding speed, the wear, the heat and the energy consumption of the tooth surface can be caused, and the friction loss power of the common worm transmission is large, the transmission efficiency is low, the tooth surface wear is fast, and the precision life is low.
Chinese patent (publication number CN203770537U) discloses a toroid worm gear pair relating to the technical field of transmission devices, the gear pair comprises a housing, an end cap, a driving motor, a planar enveloping toroid worm and an involute cylindrical helical gear; a plane enveloping ring surface worm which is positioned by an end cover and driven by a driving motor is arranged in the shell, and the plane enveloping ring surface worm is in meshing transmission with an involute cylindrical helical gear fixedly sleeved outside the inner ring of the rotary support bearing; the transmission pair can realize a large transmission ratio, so that the transmission pair can be suitable for large-torque rotary transmission. However, this patent has at least the following drawbacks: the existence of the meshing clearance in the patent can cause larger accumulated error, and the transmission precision, the position precision and the dynamic response characteristic of the whole system are seriously influenced; and the sliding friction between the transmission meshing tooth surfaces inevitably has the problem of serious tooth surface abrasion and has certain functional defects. Therefore, the utility model provides a overcome not enough of prior art and provide a transfer line for transmission.
SUMMERY OF THE UTILITY MODEL
To the deficiency of the prior art, the utility model provides a transfer line for transmission includes the screw channel on the body of rod, worm wheel and the body of rod at least, the rolling element of worm wheel support lean on in on the screw channel, wherein: under the condition that the rolling body rotates around the center of the worm wheel, the rolling body drives the rod body to rotate in a mode of being in partial line contact with the screw channel.
According to a preferred embodiment, the rod body is provided with threads for separating the screw channels, and the threads are distributed in a uniform pitch manner along the axial direction from both ends to the axial center of the rod body, that is, the width of the screw channels is the same, and the depth of the screw channels is the same.
According to a preferred embodiment, a shaft is provided on the worm wheel, and the rolling body is provided on the shaft, wherein: under the condition that the rod body rotates and the screw channel exerts radial force and tangential force on the rolling body, the rolling body rotates under the action of the radial force, and the worm wheel rotates according to the mode that the tangential force is transmitted to the worm wheel through the rotating shaft.
According to a preferred embodiment, at any time when the rod rotates, two rolling bodies are abutted in the screw channel, wherein: two of the rolling bodies are defined as a first rolling body that meshes with a first tooth face constituting the raceway and a second rolling body that meshes with a second tooth face constituting the raceway.
According to a preferred embodiment, the lead angle of one side of the thread is arranged to vary continuously, wherein: and under the condition that the rolling body is in contact with the screw channel, the screw threads with the same lead angle are arranged on two sides of the screw channel.
According to a preferred embodiment, when the plurality of rolling elements are simultaneously subjected to respective radial forces, the radial force applied to the rolling elements near the axial middle position of the rod is greater than the radial force applied to the rolling elements near the axial ends of the rod.
According to a preferred embodiment, when a plurality of the rolling elements are simultaneously subjected to respective radial forces, the tangential force applied to the rolling elements near the axial middle position of the rod body is smaller than the tangential force applied to the rolling elements near the axial two end positions of the rod body.
According to a preferred embodiment, the rod body is provided with threaded end caps at both ends, wherein: the radius of the screw end cover is larger than that of the rod body.
According to a preferred embodiment, in the case of a rolling body that is a rolling cone, the thread can reduce the meshing clearance between the rolling cone and the screw channel in such a way as to increase and/or decrease the rate of change of the lead angle.
According to a preferred embodiment, in the case that the rolling element is a rolling cone, a contact line of the rolling cone with the raceway tooth surface is a straight line.
The utility model discloses have one or more in following beneficial technological effect at least:
(1) the utility model discloses a set up rolling element and spiral shell way and make the rolling element drive the body of rod and rotate according to the mode with spiral shell way local line contact, sliding friction between the meshing surface of traditional transmission converts the rolling friction between the meshing surface into, very big reduction the frictional force between the meshing surface, thereby make the user can need not consider the teeth of a cogwheel friction expansion of generating heat and the dead problem of card, namely the user need not set up the meshing side gap and die in order to prevent the teeth of a cogwheel card, the accumulative error that the meshing gap leads to has been avoided, entire system's transmission precision has been promoted greatly, position accuracy and dynamic response characteristic.
(2) The utility model discloses an adopt first rolling element and second rolling element dislocation arrangement in the transmission, wherein first rolling element and screw channel left side flank of tooth meshing, second rolling element and screw channel right side flank of tooth contact make rolling element and screw channel flank of tooth remain the contact throughout to realize not having the backlash transmission and having the automatic gap function that disappears, avoided the more serious problem of flank of tooth wearing and tearing effectively.
Drawings
Fig. 1 is a simplified structural connection schematic diagram of a transmission rod for a transmission according to the present invention;
FIG. 2 is a simplified connection diagram of the driving rod and the worm wheel according to the present invention; and
fig. 3 is a simplified structural connection diagram of the first rolling element and the second rolling element according to the present invention.
List of reference numerals
1: the rod body 2: worm wheel 3: screw way
11: the thread 12: threaded end cap 21: rolling body
22: rotating shaft 23: first rolling element 24: second rolling element
P: screw way tooth surface
Detailed Description
As shown in fig. 1, a transmission rod for a transmission device at least comprises a rod body 1, a worm wheel 2 and a screw channel 3 on the rod body 1, wherein a rolling body 21 of the worm wheel 2 abuts against the screw channel 3, wherein: when the rolling body 21 rotates around the center of the worm wheel 2, the rolling body 21 rotates the rod body 1 in a manner of being partially in line contact with the spiral path 3.
Preferably, the local line contact means: when the rolling elements are engaged with the threads, "60% to 90% or more" in contact relationship with each other takes a contact manner of line contact.
Preferably, the rolling elements 21 are replaceable and made of a softer alloy, such as a copper alloy; the rod body 1 is made of harder material and is made of nitriding alloy steel.
According to a preferred embodiment, the shaft 1 is provided with a thread 11 for separating the flights 3, the thread 11 being distributed in a constant pitch in the direction from the axial ends to the axial centre of the shaft 1, i.e. the width of the flights 3 is the same and the depth of the flights 3 is the same. Preferably, the same width and depth of the screw channel 3 can ensure that two rolling bodies 21 are abutted in the screw channel 3 at any time when the rod body 1 rotates.
More preferably, the lead angle may be large in the middle and small on both sides. Therefore, the thread lead angle of the middle part of the rod body 1 is the largest, the roller rotation effect and the throat bearing capacity of the middle part of the rod body 1 are effectively improved, and the rolling body 21 is stressed more uniformly.
According to a preferred embodiment, as shown in fig. 2, a rotating shaft 22 is provided on the worm wheel 2, and the rolling bodies 21 are provided on the rotating shaft 22, wherein: in a case where the rod 1 rotates and the raceway 3 applies a radial force and a tangential force to the rolling bodies 21, the rolling bodies 21 rotate by the radial force, and the worm wheel 2 rotates in such a manner that the tangential force is transmitted to the worm wheel 2 through the rotary shaft 22.
Preferably, the shaft 22 may be a rotating shaft so that the relative sliding between the engaging surfaces is substantially entirely converted into relative rolling, thereby reducing friction and improving transmission efficiency.
According to a preferred embodiment, as shown in fig. 3, at any moment of rotation of the rod 1, two rolling bodies 21 are seated in the channel 3, wherein: the two rolling elements 21 are defined as a first rolling element 23 and a second rolling element 24, the first rolling element 23 meshing with a first tooth surface constituting the raceway 3, and the second rolling element 24 meshing with a second tooth surface constituting the raceway 3. Preferably, the first tooth flank and the second tooth flank together form a raceway tooth flank P.
Preferably, the utility model discloses an adopt first rolling element 23 and second rolling element 24 dislocation arrangement in the transmission, wherein first rolling element 23 and the meshing of spiral way left side flank of tooth, second rolling element 24 and the contact of spiral way right side flank of tooth make rolling element 21 and spiral way flank of tooth P remain the contact throughout to realize no backlash transmission and have the automatic gap function that disappears, avoided the more serious problem of flank of tooth wearing and tearing effectively.
According to a preferred embodiment, the lead angle of one side of the thread 11 is arranged to vary continuously, wherein: in the case where the rolling elements 21 are in contact with the raceway 3, the same lead angle of the thread 11 is provided on both sides of the raceway 3.
According to a preferred embodiment, in the case where a plurality of rolling elements 21 are simultaneously subjected to respective radial forces, the rolling elements 21 near the axial middle position of the rod 1 are subjected to a greater radial force than the rolling elements 21 near the axial ends of the rod 1.
According to a preferred embodiment, in the case where a plurality of rolling elements 21 are simultaneously subjected to respective radial forces, the tangential force to which the rolling elements 21 are subjected is smaller at positions near the axial middle of the rod body 1 than at positions near the axial ends of the rod body 1.
According to a preferred embodiment, the rod body 1 is provided with threaded end caps 12 at both ends, wherein: the radius of the threaded end cap 12 is greater than the radius of the shank 1. Preferably, the screw end cap 12 is provided with a sealing ring and a dust ring to prevent air leakage from the rod body 1 and prevent external dust from mixing into the box body, which increases friction between the rod body 1 and the rolling body 21.
According to a preferred embodiment, in the case of rolling elements 21 being rolling cones, thread 11 is able to reduce the meshing clearance between the rolling cones and track 3 in such a way as to increase and/or decrease the rate of change of the lead angle.
According to a preferred embodiment, in the case where the rolling body 21 is a rolling cone, the line of contact of the rolling cone with the tooth surface of the track 3 is a straight line.
Preferably, the solving formula for the contact line may be:
when theta is equal to 0, pi]Then, the obtained contact line is the contact line meshed with the left flank of the worm, and the roller surface corresponding to the corresponding position is used as theta epsilon [ -pi, 0]And then, the obtained contact line is the contact line meshed with the right flank of the worm.
Preferably, under the condition that a contact line between the rolling cone and the tooth surface of the screw channel 3 is a straight line, the ratio of the radial force to the tangential force borne by the rolling body 21 can be kept constant, and the stability of the rod body 1 and the worm wheel 2 is effectively ensured.
Preferably, the utility model discloses a set up rolling element 21 and spiral shell 3 and make rolling element 21 drive the body of rod 1 and rotate according to the mode with 3 local line contacts of spiral shell, sliding friction between the meshing surface of traditional transmission converts the rolling friction between the meshing surface into, very big reduction the frictional force between the meshing surface, thereby make the user can need not consider the teeth of a cogwheel friction expansion of generating heat and the dead problem of card, the user need not set up the meshing side gap in order to prevent the teeth of a cogwheel card dead, the accumulative error that the meshing gap leads to has been avoided, entire system's transmission precision, position accuracy and dynamic response characteristic have been promoted greatly.
It should be noted that the above-mentioned embodiments are exemplary, and those skilled in the art can devise various solutions in light of the present disclosure, which are also within the scope of the present disclosure and fall within the scope of the present disclosure. It should be understood by those skilled in the art that the present specification and drawings are illustrative only and are not limiting upon the claims. The scope of the invention is defined by the claims and their equivalents.
Claims (10)
1. A transmission rod for a transmission device at least comprises a rod body (1) and a screw channel (3) on the rod body (1),
the body of rod (1) can be connected with worm wheel (2) meshing, screw channel (3) support lean on in on rolling element (21) of worm wheel (2), wherein:
under the condition that the rolling body (21) rotates around the center of the worm wheel (2), the screw channel (3) drives the rod body (1) to rotate in a manner of being in local line contact with the rolling body (21).
2. A drive rod for a transmission according to claim 1, characterized in that the rod body (1) is provided with a thread (11), the thread (11) being provided on the rod body (1) in a constant pitch and the lead angle of the thread (11) on both sides being arranged to decrease continuously from the middle to both sides in the rod body axial direction.
3. A rod for a transmission according to claim 2, characterized in that, in the event of a rotation of the rod body (1), the screw channel (3) exerts radial and tangential forces on the rolling bodies (21) and the rolling bodies (21) spin under the action of the radial forces.
4. A drive rod for a transmission according to claim 3, characterized in that, in the case of a rotation of the rod body (1), the screw channel (3) exerts a radial force and a tangential force on the rolling bodies (21) and the worm wheel (2) rotates about the axis of the worm wheel (2) in such a way that the tangential force is transmitted to the worm wheel (2) via the axis of rotation (22) of the worm wheel (2),
the radial force is the force of the force point of the rolling body (21) in the direction pointing to the center of the rolling body (21), and the tangential force is the force of the force point of the rolling body (21) in the tangential extension direction.
5. The drive rod for a transmission according to claim 4, characterized in that at any moment in the rotation of the rod body (1) at least one rolling body (21) is always in abutment in the raceway (3), wherein:
the rolling bodies (21) at least comprise a first rolling body (23) and a second rolling body (24), the first rolling body (23) is meshed with a first tooth surface forming the screw channel (3), and the second rolling body (24) is meshed with a second tooth surface forming the screw channel (3).
6. A drive rod for a transmission according to claim 1, characterized in that the rod body (1) is provided with threaded end caps (12) at both ends, wherein:
the radius of the threaded end cover (12) is larger than that of the rod body (1).
7. A drive rod for a transmission according to claim 2, characterized in that in the case of the rolling elements (21) being roller cones, the thread (11) is capable of reducing the backlash between the roller cones and the track (3) in such a way that the rate of change of the lead angle is increased and/or decreased.
8. A drive rod for a transmission according to claim 4, wherein, in the case where a plurality of the rolling bodies (21) are simultaneously subjected to respective radial forces, the rolling bodies (21) near the axial middle of the rod body (1) are subjected to a radial force larger than the radial forces to which the rolling bodies (21) near the axial ends of the rod body (1) are subjected.
9. A rod for a transmission according to claim 4, wherein, in the case of a plurality of said rolling bodies (21) simultaneously subjected to respective radial forces, the tangential forces to which said rolling bodies (21) are subjected near the axial middle of said rod body (1) are smaller than the tangential forces to which said rolling bodies (21) are subjected near the axial ends of said rod body (1).
10. A transfer bar for a transmission according to claim 9, characterised in that in the case of the rolling elements (21) being rolling cones, the contact line of the rolling cones with the flanks of the screw channel (3) is rectilinear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920911707.6U CN210770120U (en) | 2019-06-17 | 2019-06-17 | Transmission rod for transmission device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920911707.6U CN210770120U (en) | 2019-06-17 | 2019-06-17 | Transmission rod for transmission device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210770120U true CN210770120U (en) | 2020-06-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920911707.6U Active CN210770120U (en) | 2019-06-17 | 2019-06-17 | Transmission rod for transmission device |
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| Country | Link |
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| CN (1) | CN210770120U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113175497A (en) * | 2021-05-18 | 2021-07-27 | 成都理工大学 | Transmission device for rotary table |
| TWI823016B (en) * | 2020-07-15 | 2023-11-21 | 邱垂財 | Nonbacklash double-row roller cam transmission device |
-
2019
- 2019-06-17 CN CN201920911707.6U patent/CN210770120U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI823016B (en) * | 2020-07-15 | 2023-11-21 | 邱垂財 | Nonbacklash double-row roller cam transmission device |
| CN113175497A (en) * | 2021-05-18 | 2021-07-27 | 成都理工大学 | Transmission device for rotary table |
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