CN113090711A - 3D RWW type ball worm gear - Google Patents
3D RWW type ball worm gear Download PDFInfo
- Publication number
- CN113090711A CN113090711A CN202110353004.8A CN202110353004A CN113090711A CN 113090711 A CN113090711 A CN 113090711A CN 202110353004 A CN202110353004 A CN 202110353004A CN 113090711 A CN113090711 A CN 113090711A
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- Prior art keywords
- worm
- ball
- type
- shaped
- rww
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H1/00—Toothed gearings for conveying rotary motion
- F16H1/02—Toothed gearings for conveying rotary motion without gears having orbital motion
- F16H1/04—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members
- F16H1/12—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members with non-parallel axes
- F16H1/16—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members with non-parallel axes comprising worm and worm-wheel
- F16H1/163—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members with non-parallel axes comprising worm and worm-wheel with balls between the co-operating parts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/02—Toothed members; Worms
- F16H55/22—Toothed members; Worms for transmissions with crossing shafts, especially worms, worm-gears
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Gear Transmission (AREA)
Abstract
The invention discloses a 3D RWW type ball worm gear, which comprises a worm wheel (1), a worm (2), a K type sheath (3), a Q type ball return check ring (4), a bearing (5) and balls (6); the middle part of the worm (2) is symmetrically provided with double-end ball grooves (201), the working interval of the worm (2) is two symmetrical leads, the length of the working interval is 2L, and each ball bypasses the axial center angle of the worm by 720 degrees in the working interval of the worm; two ends of the worm (2) are respectively provided with a ball returning hole channel (202) for connecting the end part of each ball groove, and each ball bypasses the axial center angle of the worm by 360 degrees in the non-working interval of the two ends of the worm (2); the bead returning hole channels (202) at the two ends of the worm (2) are communicated through the worm shaft hole channel (203). The invention has reasonable design and good practical application value.
Description
Technical Field
The invention relates to the technical field of worm and gear structures, in particular to a 3D RWW type ball worm and gear.
Background
Worm and worm gear structures are commonly used to transfer motion and power between two interleaved shafts. The advantages are that: the structure is simple, and the transmission ratio is large; the disadvantages are as follows: low efficiency, low precision and short service life.
Disclosure of Invention
The invention aims to provide a novel ball worm and gear structural design, which meets the requirement of high-precision transmission.
The invention is realized by adopting the following technical scheme:
A3D RWW type ball worm gear is characterized in that a transmission pair is formed by a ball and a worm gear, and speed and torque are transmitted.
Except the ball, the transmission mechanism mainly comprises parts such as a worm wheel, a worm, a K-shaped sheath, a Q-shaped retainer ring, a bearing and the like.
3D: double-ended, Double head; a dual node, Double node; double lead, Double lead.
RWW: scrolling, Roll; worm gear, word gear; worm, word.
Drawings
FIG. 1 is a schematic view of a ball worm gear; in the figure, the lead of the worm is L, D is the pitch diameter of the worm wheel, De is the outer diameter of the worm wheel, and Di is the root diameter of the worm wheel.
FIG. 1: 1-a worm gear; 2-worm, 201-double-head ball groove, 202-ball returning hole channel, 203-worm shaft hole channel; 3-K type sheath; 4-Q type ball return retainer ring; 5-a bearing; 6-rolling balls.
FIG. 1-1 shows a cross-sectional view A-A of FIG. 1; in the figure, B is the pitch of the double pitch circle of the worm wheel, d is the pitch diameter of the worm, and 2 delta is the wrap angle of the center of the worm.
FIG. 2 shows a schematic view of the construction of a 3D RWW worm (only one end of the back ball returning groove is shown).
FIG. 2-1 shows a cross-sectional view (only one side is shown) along the line A of FIG. 2.
FIG. 3 is a schematic view showing the meshing state of the balls and the worm wheel in the tooth surface working section of the worm wheel; in the figure, βkIs a helix angle (lead angle).
Fig. 3-1 shows a cross-sectional view of fig. 3.
Fig. 3-2 shows the meshing curve after trimming at a helix angle.
Fig. 4 shows an analysis diagram of a meshing curve (double C-shaped raceway) of a single raceway (single tooth groove) of the worm wheel and a ball.
Fig. 5 shows a schematic view of a K-type jacket.
Fig. 5-1 shows a side view of a K-type jacket.
Fig. 5-2 shows a schematic B-B cross-sectional view of a K-type jacket.
Fig. 6 shows a side view of a Q-shaped ball-returning retainer.
Fig. 6-1 shows a front view of a Q-shaped beadback retainer.
Fig. 6-2 shows a schematic view of a Q-shaped ball-returning retainer.
Fig. 7 shows an outline of the worm wheel.
Detailed Description
The following detailed description of specific embodiments of the invention refers to the accompanying drawings.
First, the working principle
1. Basic structure
A3D RWW type ball worm gear is characterized in that a transmission pair is formed by a ball and a worm gear, and speed and torque are transmitted.
Except the ball, the transmission mechanism mainly comprises parts such as a worm wheel, a worm, a K-shaped sheath, a Q-shaped retainer ring, a bearing and the like.
2. The transmission is characterized in that: double-head, double-node and double-guide-distance
Double-end: the worm wheel and the worm are both double-ended, and the functions of the worm wheel and the worm are that no back clearance exists, and the output force is uniform and stable. If only power transmission is performed, the transmission precision is not required, and a single head can be adopted. The worm with large structural size can adopt multiple threads when the strength allows.
The following explanation of this patent is for the double head.
Double-node: when the ball works in the working section, the outer surface of the ball is in line contact with the raceway surface of the worm, and the outer surface of the ball is in point contact with the tooth groove of the worm wheel. However, there are two nodes on each tooth slot of the worm gear through which the ball makes line contact with the worm gear, and these two nodes are defined as the nominal node of the worm gear and also the calculation node of the worm gear. The line contact nodes on the worm wheel form two parallel circles, namely a double pitch circle of the worm wheel.
Double lead: the ball and worm work interval is two leads, namely 720 degrees around the axis of the worm. The rest are non-working sections, and the ball rounds the axis angle of the worm by 360 degrees. One revolution of the ball is 1080 around the worm axis angle.
3. Ball circulation process
The ball circulation is designed to be in the worm, so the ball circulation process is explained from the perspective of the worm.
The balls being divided into according to the position of the wormAn active segment and an inactive segment. See fig. 2, the working section is the section where the balls are meshed with the worm gear and the worm and the gear and the worm and the torque are transmitted, and points a-o in fig. 21Point-b. Of course, the working section is divided into a working area and a non-working area, which are also described in the section of worm wheel.
The non-working section is a ball returning part and is divided into five sections.
First stage, natural bead returning: points b to c
Namely, the balls sink down from the pitch circle surface of the worm to the lower part of the outer circle of the worm gradually and integrally under the action of the worm wheel raceway and the worm raceway (in a non-working state).
Second stage, forced return: c point to d point
After the ball continues to sink under the action of the Q-shaped ball return retainer ring (in the radial direction of the worm), the steering is completed (in the axial direction of the worm).
Third section, perforation: d point to e point
The balls pass through the worm along the bore of the worm axis.
Fourth stage, forced bead discharging: e point to f point
Corresponding to the second segment, the position is symmetrical.
Fifth stage, naturally bead generation: f point to a point
Corresponding to the first segment, the position is symmetrical.
If the worm is reversed, the cycle from the first segment to the fifth segment is reversed, i.e., from the fifth segment to the first segment.
4. Curve of engagement
The ball is in line contact with the worm, and the track is a reducing spiral line.
The ball and the worm wheel are in point contact in the working interval (transmitting torque) except for the point of the pitch circle of the worm wheel, which is in line contact. After the point contact tracks of the ball and the worm wheel are arranged according to the helical angle, a special curve is presented, the shape of the curve is similar to the framework of a Chinese lantern, and therefore, the curve is named as a Chinese lantern line, and is shown in figure 3.
Secondly, the technical characteristics (innovation point)
1. The meshing curve is Chinese lantern line
The worm wheel and the worm are both double-headed, and the meshing parts are bilaterally symmetrical with a central node O (shown in figure 1). The non-backlash transmission pair adopting the double-head ball worm gear structure effectively increases the contact point of the worm and the worm wheel, namely the force output point, so that the structure has larger output torque, transmission precision and rigidity.
The working interval of the ball subdivided according to the position of the worm wheel is as follows: the width between the two pitch circles of the worm wheel is B (as shown in figure 1-1) and the length between the two pitch circles of the worm is 2L. The contact area of the ball and the K-shaped sheath is a non-working area, and the ball returning area is also a non-working area.
The ball rotates twice (720 degrees) in the worm working range, and the corresponding worm wheel meshing part is 2 raceways (tooth grooves), i.e. the worm wheel generally has 4 adjacent tooth grooves (2 heads of the worm) working at the same time. Of course, when the 5 th tooth slot of the worm wheel starts to operate, the part of the 1 st tooth slot is still operated, and the 1 st tooth slot is completely withdrawn when the 5 th tooth slot is all operated.
The meshing state of the worm wheel and the ball at this time will be described by taking the time in the standard operating state (4 th tooth groove is operated, 5 th tooth groove is not yet operated) as an example. Fig. 3-2 shows the state of engagement between the balls and the worm wheel in the operating region at this time. Starting from the left:
a first tooth groove: the meshing curve is arc-shaped on the left side of the tooth socket, the arc is leftward, and the radian is large.
A second gear groove: the meshing curve is arc-shaped on the left side of the tooth socket, the arc is leftward, and the radian is smaller.
A third tooth groove: the meshing curve is arc-shaped on the right side of the tooth socket, the arc is right, and the radian is small.
A fourth tooth groove: the meshing curve is arc-shaped on the right side of the tooth socket, the arc is rightward, and the radian is large.
2. Double-node worm wheel and double C roller path thereof
The Chinese lantern line in the upper section refers to the whole meshing surface of the worm gear and the worm, and the section is a raceway (tooth groove) of the worm gear.
Double node of worm wheel:
the double node is the starting point of the transmission pair design; the double node is the focus of the transmission pair engagement; the double node is the origin of the gear pair calculation.
Double C raceway of worm wheel
When the ball is meshed with the tooth space of the worm wheel, the contact point of each ball and the inner cambered surface of the tooth space of the worm wheel is similar to the matching of the ball and the outer ring of the bearing in the radial thrust ball bearing (except for two nodes of the tooth space of the worm wheel), and the ball bears loads in two directions, namely the axial direction and the radial direction of the worm. Unlike bearings, however, the direction and magnitude of the force applied to the ball varies under constant load.
The meshing curve analysis of the worm wheel single raceway (single tooth groove) and the ball is shown in figure 4.
Setting: the N point and the S point are double nodes of a worm wheel
The single head of the worm has n balls in 2L (double lead)
l11The first ball rotates the track of the roller path for the first time
……
ln1The n-th ball rotates the track of the roller path for the first time
l12The first ball rotates for the second time through the track of the roller path
……
ln2The n-th ball rotates the track of the roller path for the second time
From fig. 4, it can be taken:
the N and S double nodes are like two magnetic poles in a magnetic field, and the track of each ball is like a magnetic line of force. The raceway (tooth groove) is divided into two parts along the spiral line direction, and two conjugate arc curved surfaces, namely 'double C raceways', are presented.
3. A double-head and double-lead internal circulation worm, which is shown in figure 1, figure 2 and figure 2-1.
The worm is designed into a double-head structure so as to ensure the transmission precision, namely no backlash.
The working section is designed to be 2 times of lead, if the working section is lengthened, the worm and the worm wheel raceway are interfered, if the working section is shortened, the transmission rigidity and the torque of the meshing pair are reduced, and therefore the lead is exactly 2 times.
The non-working section is a bead returning section which is divided into natural bead returning, forced bead returning and perforation. The ball returning section rotates exactly one circle (360 degrees) when viewed from the direction of the head of the worm shaft.
4. K-shaped sheath
As shown in FIG. 5, the K-shaped jacket is a support of the worm, and is matched with the ball returning surface of the worm and the ball returning section of the worm, so that the K-shaped jacket is the most important structural component of the transmission pair of the design.
(1) And two ends of the worm are arranged in the K-shaped sheath through bearings, so that the K-shaped sheath determines the axial and radial positions of the worm and also determines the position of the worm in the whole transmission pair, as shown in figure 1.
(2) The middle section (length 2L) of the inner hole of the K-shaped sheath is matched with the ball, and is a ball non-working area except the range of Bx 2L in the 2L working section of the worm, as shown in figure 1.
(3) And the extension arc sections (from the 2L line to the worm and the shaft shoulder of the Q-shaped ball return retainer ring) at the two ends of the middle section of the inner hole of the K-shaped sheath are ball natural ball return sections, as shown in figure 1.
(4) Straight line sections on two sides of the natural bead returning section of the inner hole of the K-shaped sheath are installation positions of the Q-shaped bead returning retaining ring, as shown in figure 1.
(5) A rectangular (approximate) notch is arranged on the outer circular surface of the K-shaped sheath and is vertical to the axis, the upper side and the lower side of the notch are arc-shaped oblique planes which are matched with the outer circular oblique plane of the worm wheel and are the interface of a ball working area and a non-working area in a 2L working area, as shown in figure 1.
5. Q-shaped ball-returning retainer ring
The ball is forced to return after finishing natural returning: after the ball continues to sink under the action of the Q-shaped ball return retainer ring (in the radial direction of the worm), the steering is completed (in the axial direction of the worm). The reverse bead-out process is reversed as opposed to bead-back.
As shown in fig. 6 and 6-1, the inner hole of the Q-shaped ball-returning retainer ring has two symmetrical circular arcs, and the two circular arcs gradually become shallow along the oblique angle (the angle is set during design) until the two circular arcs disappear.
The Q-shaped ball return retainer ring is fixed on the worm, and the worm is connected into a whole when working. Thereby realizing the circulation of the balls in the worm.
Claims (4)
1. The utility model provides a 3D RWW type ball worm gear which characterized in that: comprises a worm wheel (1), a worm (2), a K-shaped sheath (3), a Q-shaped ball return retainer ring (4), a bearing (5) and a ball (6);
the middle part of the worm (2) is symmetrically provided with double-end ball grooves (201), the working interval of the worm (2) is two symmetrical leads, the length of the working interval is 2L, and each ball bypasses the axial center angle of the worm by 720 degrees in the working interval of the worm; two ends of the worm (2) are respectively provided with a ball returning hole channel (202) for connecting the end part of each ball groove, and each ball bypasses the axial center angle of the worm by 360 degrees in the non-working interval of the two ends of the worm (2); the bead returning pore canals (202) positioned at the two ends of the worm (2) are communicated through the worm shaft pore canal (203); one revolution of the balls is 1080 ° around the worm axis;
the worm (2) is meshed with four tooth grooves (101) on the surface of the worm wheel (1) through balls (6);
two ends of the worm (2) are respectively assembled with Q-shaped ball returning check rings (4) and then assembled in the K-shaped sheath (3) through a bearing (5); the K-shaped bottom surface of the K-shaped sheath (3) is matched with the excircle inclined surface of the worm wheel (1).
2. A 3D RWW type ball worm gear according to claim 1, characterized in that: the outer surface of the ball positioned in the working interval of the worm (2) is in line contact with the ball groove, and the track is a reducing spiral line.
3. A 3D RWW type ball worm gear according to claim 1 or 2, characterized in that: two end points of each tooth groove (101) of the worm wheel (1) are used as nominal nodes, when the balls pass through the two nominal nodes of the tooth grooves, the balls are in line contact, and the balls in the rest sections are in point contact with the tooth grooves.
4. A 3D RWW type ball worm gear according to claim 1, characterized in that: the ball return device is characterized in that the middle section of the middle part of the inner hole of the K-type sheath (3) is 2L and is matched with a ball to form a ball working section, the extending circular arc sections at the two ends of the middle section of the inner hole of the K-type sheath (3) are matched with the ball to form a ball natural return section, and the two sides of the extending circular arc sections of the K-type sheath (3) are straight-line sections for installing a Q-type return ball check ring (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110353004.8A CN113090711A (en) | 2021-04-01 | 2021-04-01 | 3D RWW type ball worm gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110353004.8A CN113090711A (en) | 2021-04-01 | 2021-04-01 | 3D RWW type ball worm gear |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113090711A true CN113090711A (en) | 2021-07-09 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110353004.8A Pending CN113090711A (en) | 2021-04-01 | 2021-04-01 | 3D RWW type ball worm gear |
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| Country | Link |
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| CN (1) | CN113090711A (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1201753A (en) * | 1968-03-26 | 1970-08-12 | Kearney & Trecker Corp | Recirculating ball worm drive |
| FR2456269A1 (en) * | 1979-05-07 | 1980-12-05 | Luc Jacques | Ball screw with return path for balls - has tangential tube without sharp curves to reduce ball friction |
| JPH0617885A (en) * | 1992-06-30 | 1994-01-25 | Hiroshi Toyomasa | Drive transmission gear and manufacture thereof |
| BE1016310A5 (en) * | 2004-11-10 | 2006-07-04 | Technologid | Worm gear transmission, has worm gear mantle surface provided with sockets containing rotating balls |
| CN201214132Y (en) * | 2008-05-29 | 2009-04-01 | 山西安伦锻压机床有限公司 | Flange ring rolling mill with distance measurer |
| CN101676582A (en) * | 2008-09-18 | 2010-03-24 | 周文海 | Steel ball rolling type worm gear pair and speed reducer thereof |
| CN101749372A (en) * | 2008-12-01 | 2010-06-23 | 刘运武 | Spiral movable labor-saving speed reducer |
| CN103615499A (en) * | 2013-09-30 | 2014-03-05 | 李泰安 | Ball worm gear pair |
| CN203670615U (en) * | 2014-01-23 | 2014-06-25 | 单文博 | Ball, worm and gear transmission pair |
| AU2015202820B1 (en) * | 2015-03-09 | 2015-09-24 | Nord-Lock Australia Pty Ltd | A high torque transmission |
-
2021
- 2021-04-01 CN CN202110353004.8A patent/CN113090711A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1201753A (en) * | 1968-03-26 | 1970-08-12 | Kearney & Trecker Corp | Recirculating ball worm drive |
| FR2456269A1 (en) * | 1979-05-07 | 1980-12-05 | Luc Jacques | Ball screw with return path for balls - has tangential tube without sharp curves to reduce ball friction |
| JPH0617885A (en) * | 1992-06-30 | 1994-01-25 | Hiroshi Toyomasa | Drive transmission gear and manufacture thereof |
| BE1016310A5 (en) * | 2004-11-10 | 2006-07-04 | Technologid | Worm gear transmission, has worm gear mantle surface provided with sockets containing rotating balls |
| CN201214132Y (en) * | 2008-05-29 | 2009-04-01 | 山西安伦锻压机床有限公司 | Flange ring rolling mill with distance measurer |
| CN101676582A (en) * | 2008-09-18 | 2010-03-24 | 周文海 | Steel ball rolling type worm gear pair and speed reducer thereof |
| CN101749372A (en) * | 2008-12-01 | 2010-06-23 | 刘运武 | Spiral movable labor-saving speed reducer |
| CN103615499A (en) * | 2013-09-30 | 2014-03-05 | 李泰安 | Ball worm gear pair |
| CN105889421A (en) * | 2013-09-30 | 2016-08-24 | 李泰安 | Ball worm gear pair |
| CN203670615U (en) * | 2014-01-23 | 2014-06-25 | 单文博 | Ball, worm and gear transmission pair |
| AU2015202820B1 (en) * | 2015-03-09 | 2015-09-24 | Nord-Lock Australia Pty Ltd | A high torque transmission |
Non-Patent Citations (1)
| Title |
|---|
| 李承志等: "滚珠环面蜗杆副的传动特性", 《湖北工学院学报》 * |
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