US20130294856A1 - Balancing of a continuous variable clutch assembly - Google Patents
Balancing of a continuous variable clutch assembly Download PDFInfo
- Publication number
- US20130294856A1 US20130294856A1 US13/932,852 US201313932852A US2013294856A1 US 20130294856 A1 US20130294856 A1 US 20130294856A1 US 201313932852 A US201313932852 A US 201313932852A US 2013294856 A1 US2013294856 A1 US 2013294856A1
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- US
- United States
- Prior art keywords
- sheave
- cam
- clutch
- sheave member
- conical
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B35/00—Methods for boring or drilling, or for working essentially requiring the use of boring or drilling machines; Use of auxiliary equipment in connection with such methods
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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
- F16H55/32—Friction members
- F16H55/52—Pulleys or friction discs of adjustable construction
- F16H55/56—Pulleys or friction discs of adjustable construction of which the bearing parts are relatively axially adjustable
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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
- F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
- F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
- F16H63/04—Final output mechanisms therefor; Actuating means for the final output mechanisms a single final output mechanism being moved by a single final actuating mechanism
- F16H63/06—Final output mechanisms therefor; Actuating means for the final output mechanisms a single final output mechanism being moved by a single final actuating mechanism the final output mechanism having an indefinite number of positions
- F16H63/067—Final output mechanisms therefor; Actuating means for the final output mechanisms a single final output mechanism being moved by a single final actuating mechanism the final output mechanism having an indefinite number of positions mechanical actuating means
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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
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/02—Gearings for conveying rotary motion by endless flexible members with belts; with V-belts
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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
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/66—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for continuously variable gearings
- F16H61/662—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for continuously variable gearings with endless flexible members
- F16H61/66272—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for continuously variable gearings with endless flexible members characterised by means for controlling the torque transmitting capability of the gearing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49764—Method of mechanical manufacture with testing or indicating
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T408/00—Cutting by use of rotating axially moving tool
- Y10T408/03—Processes
Definitions
- a typical driven clutch sheave includes two sheave members.
- the first sheave member is called the stationary sheave member because it is locked to a post or shaft.
- the other sheave member is called moveable because it translates along the axis of the post or shaft.
- a cam having a cam angle profile is attached to or incorporated into the moveable sheave member.
- the cam profile is for torque sensing.
- the moveable sheave member rotates about the post and slides linearly closer to or farther away from the stationary sheave member due to the cam profile and a spring force to form a sheave that is continuous variable clutch (CVC).
- CVC continuous variable clutch
- a CVC delivers torque by squeezing a belt tight enough to prevent slipping.
- the cam profile allows for the CVC to be torque sensing. The more torque that is put into the CVC the tighter the CVC squeezes the belt. This will shift the CVC into a lower ratio. Likewise when the torque drops, the CVC exerts less belt squeeze because a reaction force in the cam allows the CVC to shift into a higher ratio. Hence, the CVC has torque sensing capabilities.
- a continuous variable clutch in one embodiment, includes a first sheave member and a second sheave member.
- the first sheave member includes a first central hub and a first conical-faced surface extending radially from the first central hub.
- the first central hub forms a cavity.
- the second sheave member includes a second central hub and a second conical-faced surface that extends radially from the second central hub.
- the second central hub of the second sheave member is received in the cavity of the first central hub such that the first conical-faced surface of the first sheave member faces the second conical-faced surface of the second sheave portion.
- the second central hub of the second sheave member is further configured to move axially within the first central hub of the first sheave member based on the amount of torque on the continuous variable clutch to vary a gap distance between the first and second conical-faced surfaces.
- the first sheave member and the second sheave member further form a central passage to receive an input shaft of a transmission.
- FIG. 1A is a front perspective view of a continuous variable clutch of one embodiment of the present invention.
- FIG. 1B is a back perspective view of the clutch of FIG. 1A ;
- FIG. 2 is a side perspective view of the unassembled clutch of FIG. 1 ;
- FIG. 3 is a side perspective partially unassembled view of the clutch of FIG. 1 ;
- FIG. 4 is another side perspective partially unassembled view of the clutch of FIG. 1 ;
- FIG. 5A is a cross-sectional side view of the assembled clutch of FIG. 1 , illustrating sheave roller clutch positioning
- FIG. 5B is a cross-sectional side view of the assembled clutch of FIG. 1 , illustrating cam roller clutch positioning
- FIG. 5C is a cross-sectional side view of an assembled clutch of FIG. 1 , illustrating the clutch in high gear positioning;
- FIG. 6 is a balancing flow diagram of one embodiment of the present invention.
- FIG. 7A is a cross-sectional side view of an assembled clutch of FIG. 1 and an input shaft of a transmission;
- FIG. 7B is a cross-sectional side view of an assembled clutch of FIG. 1 and an input shaft of a transmission engaged with the clutch;
- FIG. 8A is side perspective view of a cross-sectional side view of an unassembled continuous variable clutch of another embodiment of the present invention.
- FIG. 8B and 8C are cross-sectional side views of the clutch of FIG. 8A ;
- FIGS. 9A and 9B are cross-sectional side views of the clutch of FIG. 8A engaged with an input shaft of a transmission.
- FIG. 10 is a cross-sectional side view of yet another embodiment of a continuously variable clutch of another embodiment of the present invention.
- Embodiments of the present invention provide continuous variable clutches (CVCs) without a sheave member of the CVC being coupled stationary to a center post.
- sheave members are designed to be in direct rotational communication with a transmission shaft.
- embodiments of the clutches form a central passage that is designed to engage an input shaft of a transmission. Benefits of this design include the use of smaller central passages through the CVC. This provides better length to diameter ratio of bushing used in the CVC, reduced costs since the post is no longer needed, a reduction in weight of about 15% over a typical CVC, less rotational inertia which results in a better response and better overall performance than a typical CVC.
- embodiments of the CVC can be pre-balanced as a unit before they are coupled to a transmission. Hence, they can be shipped pre-balanced and then simply coupled to a transmission at a remote location without the need for matched sets of balanced sheaves.
- FIGS. 1A , 1 B and 2 illustrate an embodiment of a CVC 100 with no relative motion.
- FIG. 1A is a front perspective view of the CVC 100
- FIG. 1B is a back view of the CVC 100
- FIG. 2 is an unassembled side view of the CVC 100 .
- the sheaves 102 and 104 of the clutch are tied together to prevent rotation between the sheaves 102 and 104 . If rotation is present, undesirable friction between the faces of a belt engaging the sheaves 102 and 104 can be present. This friction loss is called belt smear. This smearing is detrimental to belt life and is a performance and efficiency loss.
- Clutch 100 includes a first sheave member 102 and a second sheave member 104 .
- the second sheave member 104 selectively moves longitudinally (axially) in relation to the first sheave member 102 as discussed further below.
- the first sheave member 102 includes a first central hub 102 b having a first central opening 102 d to a chamber 102 d and a first conical faced surface 102 a.
- the first conical faced surface 102 a extends radially from the first central hub 102 b about the central opening 102 d.
- the first central hub 102 b extends from the first central opening 102 d in generally a direction that is perpendicular in relation to the first conical faced surface 102 a. Further, the first conical faced surface 102 a faces a direction that is opposite from the direction the first central hub 102 b extends from the first central opening 102 d.
- the second sheave member 104 includes a second central hub 104 b having a first central opening 104 e and a second conical faced surface 104 a. The second conical faced surface 104 a extends radially from the first central opening 104 e of the second central hub 104 b.
- the second central hub 104 b extends from the first central opening 104 e in generally a direction that is perpendicular in relation to the second conical faced surface 104 a. Further the second conical faced surface 104 a of the second sheave member 104 faces the direction the second central hub 104 b extends from the first central opening 104 e of the second conical faced surface 104 a.
- the second central hub 104 b of the second sheave member 104 is positioned in the first central hub 102 b of the first sheave member 102 such that the first conical faced surface 102 a of the first sheave member 102 faces the second conical faced member 104 a of the second conical member 104 .
- the first central hub 102 b of the first sheave member 102 has a second hub central opening 102 c.
- the first central hub 102 b of the first sheave member 102 further has opposed first and second side slots 121 a and 121 b.
- a first sheave roller 120 a is received in the first side slot 121 a and a second sheave roller 120 b is received in the second side slot 121 b.
- the first and second sheave rollers 120 a and 120 b are further discussed below.
- FIG. 1B illustrates, a cam cover 106 d of a cam assembly 106 is coupled to the second sheave member 104 . Referring to the unassembled view of FIG.
- the second central hub 104 b of the second sheave member 104 is designed to be received in a cavity 102 e formed by the first central hub 102 b of the first sheave member 102 as discussed above.
- the second central hub 104 b includes opposed first and second bores 104 d and 104 g ( 104 g is illustrated in FIG. 5A ).
- the bores 104 d and 104 g are aligned with slots 121 a and 121 b of the first central hub 102 b of the first sheave member 102 .
- the first sheave roller 120 a that is received in the first side slot 121 a of the first sheave member 102 includes a first sheave roller central passage 117 a.
- the second sheave roller 120 b that is received in the second side slot 121 b of the first sheave member 102 a includes a second sheave roller central passage 117 b.
- a first sheave roller clutch fastener 118 a passes through the first sheave roller central passage 117 a of the first sheave roller 120 a and into the first bore 104 d in the second hub 104 b of the second sheave member 104 .
- a second roller fastener 118 b passes through the second sheave roller central passage 117 b of the second sheave roller 120 b and into the second bore 104 g in the second hub 104 b of the second sheave member 104 .
- Pins 122 a and 122 b are then inserted through respective apertures in the fasteners 118 a and 118 b and portions of the second central hub 104 b to retain the fasteners 118 a and 118 b in the second sheave member 104 as further illustrated in FIG. 5A .
- This operatively forms a connector that connects the first sheave member 102 to the second sheave member 104 via the first and second sheave rollers 120 a and 120 b.
- This connection allows longitudinal movement between the first and second sheave portions 102 and 104 while preventing rotational movement between the first and second sheave portions 102 and 104 .
- the first and second sheave members 102 and 104 rotate together without relative rotation as the second sheave member 104 moves longitudinally. This embodiment helps prevent belt smear.
- An adjustment assembly 105 is used to selectively provide the longitudinal (axial) movement of the second conical face surface 104 a of the second sheave member 104 in relation to the first conical face surface 102 a of the first sheave member 102 .
- the adjustment assembly 105 includes a cam assembly 106 , a cylindrical spider 108 and a biasing member 112 .
- the cam assembly 106 includes a cylindrical cam portion 106 e that extends from cam cover 106 d.
- the cam portion 106 e has first and second cam slots 106 a and 106 b.
- the first and second cam slots 106 a and 106 b have respective cam profile surfaces 302 and 304 (cam profiles) discussed further below.
- the cam cover 106 d is coupled to the second sheave member 104 by a plurality of fasteners 128 .
- the cylindrical spider 108 has opposed first and second shafts 108 a and 108 b.
- the first and second shafts 108 a and 108 b extend outward from an outer surface 107 of the spider 108 .
- the spider 108 further includes a central spider passage 108 c.
- An inner surface of the spider 108 that defines the central spider passage 108 c includes a plurality of grooves that form internal gears (i.e. internal splines) configured to engage exterior splines on an input shaft of a transmission.
- the adjustment assembly 105 further includes a first cam roller 110 a.
- the first cam roller 110 a includes a first cam central passage 111 a (shown in FIG. 5B ).
- the first shaft 108 a of the spider 108 is received in the first cam central passage 111 a of the first cam roller 110 a.
- the first cam roller 110 a is further received in the first cam slot 106 a of the cam portion 106 e of the cam assembly 106 .
- a first cam roller fastener includes a first C-clip 126 a and washer 124 a engages the first shaft 108 a of the spider 108 to retain the first cam roller clutch 110 a on the first shaft 108 .
- the adjustment assembly 100 also includes a second cam roller 110 b (shown in FIG. 5B ).
- the second cam roller 110 b includes a second cam central passage 111 b.
- the second shaft 108 b of the spider 108 is received in the second cam passage 111 b of the second cam roller 110 b.
- the second cam roller 110 b further is received in the second cam slot 106 b of the cam portion 106 e of the cam assembly 106 .
- a second cam roller fastener includes a second C-clip 126 b and a second washer 124 b that engage the second shaft 108 b of the spider 108 to retain the second cam roller 110 b on the second shaft 108 b of the spider 108 .
- a biasing member 112 is positioned between an inner surface of the second hub 104 b of the second sheave member 104 and a surface of the spider 108 .
- the biasing member 112 exerts a biasing force on the spider 108 to position the second conical face surface 104 a of the second sheave member 104 near the first conical face surface 102 a of the first sheave member 102 .
- the second hub 104 b of the second sheave member 104 forms a chamber 104 f.
- the cam portion 106 e of the cam assembly 106 , the spider 108 , the cam rollers 110 a and 110 b and the biasing member 112 are received in chamber 104 f of the second sheave member 104 .
- FIG. 3 a side perspective partially unassembled view of the clutch with no relative motion 100 is illustrated.
- the second hub 104 b of the second sheave member 104 is positioned to be received in chamber 102 e of the first hub 102 a of the first sheave member 102 .
- the first cam roller 110 a and the second cam roller 110 b of the spider 108 respectfully aligned with cam slots 106 a and 106 b of the cam assembly 106 .
- the spider 108 is illustrated as being inserted within the cam portion 106 e of the cam assembly 106 with roller clutches 110 a and 110 b respectively positioned in cam slots 106 a and 106 b of the cam portion 106 e of the cam assembly 106 .
- Each of the cam slots 106 a and 106 b includes opposed cam slot surfaces 302 and 304 in which the respective cam rollers 110 a and 110 b can engage.
- the first cam slot surface 304 is engaged when an engine (not shown) is driving a vehicle (not shown) containing clutch 100 .
- the second cam slot surface 302 is engaged when the vehicle is implementing engine braking. By changing the cam slot surface 302 profile, the amount of engine braking can be varied. Further discussion of the effect of the cam slot surfaces 302 and 304 are described in commonly assigned U.S. Pat. No. 6,743,129 which is incorporated in its entirety herein.
- FIG. 5A illustrates a cross-sectional side view of an assembled clutch with no relative motion 100 .
- FIG. 5A illustrates pins 122 a and 122 b that retain fasteners 104 d and 104 g in the second sheave member 104 .
- fasteners 104 d and 104 g retain the respective first and second sheave rollers 120 a and 120 b in the slots 121 a and 121 b of the first central hub 102 b of the first sheave member 102 to slidably couple the first sheave member 102 to the second sheave member 104 .
- FIG. 1 illustrates a cross-sectional side view of an assembled clutch with no relative motion 100 .
- FIG. 5A illustrates pins 122 a and 122 b that retain fasteners 104 d and 104 g in the second sheave member 104 .
- fasteners 104 d and 104 g retain the respective first and second sheave rollers 120 a
- FIG. 5A also illustrates the positioning of bearing 116 about opening 102 c of the first central hub 102 b, bearing 114 in a second central opening 104 g (shown in FIG. 3 ) of the second central hub 104 b and bearing 115 in opening 106 c of the cam 106 .
- the bearings 116 , 114 and 115 engage different portions of an input shaft 700 of a transmission which is further discussed below in regards to FIGS. 7A and 7B .
- FIG. 5A also illustrates a sheave pocket 131 that is designed to receive a thrust bushing 154 and load washer 152 (illustrated in FIG. 7B ) that help retain the clutch 100 on a transmission shaft due to axial forces.
- FIG. 5B further illustrates the cross-sectional side view of an assembled clutch with no relative motion 100 .
- This view illustrates the positioning of the first and second roller clutches 110 a and 110 b in the respective first and second cam slots 106 a and 106 b of the cam 106 .
- the clutch 100 is set for low gearing with the first and second conically faced surfaces 102 a and 104 a of the first and second sheave members 102 and 104 positioned close to each other so a drive belt (not shown) will ride high up on the respective first and second conical faced surfaces 102 a and 104 a away from a central longitudinal axis 502 of the clutch 100 .
- the drive belt may be an endless V-shaped belt known in the art that connects a drive element to a driven clutch such as clutch 100 .
- the biasing member 112 is extended pushing the spider 108 away from an inner front surface of the second central hub 104 b of the second hub 104 which in turn positions the first and second conical faced surface next to each other.
- FIG. 5C illustrated the clutch 100 in a high gearing configuration where a drive belt (not shown) would ride low (closer to the longitudinal axis 502 ) on the first and second conical faced surfaces 102 a and 104 a or even ride solely on the second central hub 104 b of the second sheave member 104 .
- first and second rollers 110 a and 110 b have moved in cam surfaces defined by the cam slots 106 a and 106 b of the cam 106 thereby compressing biasing member 112 .
- Rotational forces delivered by the drive belt (not shown) move the first and second rollers 110 a and 110 b in cam profile surfaces (cam profile) defined by the cam slots 106 a and 106 b of the cam 106 to counter the biasing force of the biasing member 112 .
- the cam profile and the biasing member 112 work together as a torque sensing unit.
- the biasing member 112 in this embodiment is a spring.
- a balancing flow diagram 600 of one embodiment is illustrated.
- the clutch 100 is temporally mounted on a test shaft in balancing machine 602 .
- the conical-shaped faces 102 a and 104 a of the sheaves 102 and 104 are positioned a select distance away from each other (almost a full open position).
- the rotational shaft holding the clutch 100 is rotated ( 604 ).
- the balancing machine measures any imbalance in single or multiple planes near each sheave 102 and 104 ( 606 ). If an imbalance is detected ( 606 ), the balancing machine determines the location to remove material and the amount of material to remove ( 608 ).
- the balancing machine calculates the amount of mass required to be removed from a sheave 102 or 104 to create a clutch 100 that is within a balanced specification.
- the machine uses a drill bit to drill out the calculated amount of material from the respective sheave member 102 or 104 ( 610 ) and then rechecks the value ( 606 ). Balancing of the clutch 100 reduces vibration during use and premature failures.
- the tied clutch 100 is balanced ( 606 ), it is removed from the balancing machine and the rotation shaft. It is then ready to be shipped to the customer assembled and pre-balanced ( 612 ).
- FIG. 7A illustrates an input shaft 700 of a transmission (not shown) that is aligned with a central passage 125 along the longitudinal rotational axis 502 formed in the clutch 100 that is accessed by the central opening 106 c in the cover 106 d of the cam assembly 106 .
- the input shaft 700 of the transmission further includes exterior splines 702 , a shoulder 706 and a central bore 704 .
- the central bore 704 of input shaft 700 includes a threaded bore portion that selectively engages external threads 156 of a bolt 150 used to hold the shaft 700 in the clutch 100 via a load washer 152 and a thrust bushing 154 that is received in recess 131 of the first sheave 102 , as illustrated in FIG. 7B .
- FIG. 7A illustrates an input shaft 700 of a transmission (not shown) that is aligned with a central passage 125 along the longitudinal rotational axis 502 formed in the clutch 100 that is accessed by the central opening 106 c in the
- FIG. 7B illustrates the input shaft 700 of the transmission being received in the tied clutch 100 .
- the exterior spline 702 of the input shaft 700 of the transmission engages the internal splines in the central passage 108 c of the spider 108 such that rotation of the spider 108 rotates the transmission input shaft 700 .
- the second central opening 102 c in the first central hub 102 b of the first sheave member 102 is aligned with a central opening 104 h in the second hub 104 b of the second sheave member 104 .
- central opening 108 c of the spider 108 and the central opening to the cam central opening 106 c of the cam cover 106 d are further aligned to form the central passage 125 to receive the input shaft 700 of the transmission.
- bearings 116 , 114 and 115 are used to engage surfaces of the input shaft 700 .
- bearings 116 in the second central opening 102 c of the first hub 102 b engages a first surface portion of the input shaft 700
- bearing 114 in central opening 104 h of the second hub 104 b of the second sheave member 104 engages another surface portion of the input shaft 700 and bearing 115 in central opening 106 to the cam cover 106 d engages yet another surface portion of the input shaft 700 .
- the second (moving) sheave member 104 and the cam assembly 106 translates along a length of the input shaft 700 to either open up or close down a gap between the first and second conical faces 102 a and 104 a of the first and second sheaves 102 and 104 .
- the interior gears (splines) of the spider 108 engage the splines 702 of the input shaft 700 therein locking rotation of the spider 108 with rotation of the input shaft 700 .
- shoulder 706 of the input shaft 700 abuts an end surface of the spider 108 thereby preventing the spider 108 from translating along a length of the input shaft 700 .
- FIG. 8A an exploded side perspective view of another embodiment of a CVC 200 is illustrated.
- a first (stationary) sheave member 202 is not tied together with a second (movable) sheave member 204 .
- this non-tied clutch 200 does not include a central post.
- the first sheave member 202 includes a hub 202 c with a first opening 202 d to a chamber 202 e.
- a first conical-faced surface 202 a of the first sheave member 202 extends radially from the first opening 202 d.
- Opposite the first conical-faced surface 202 a is a second surface 202 b of the first sheave member 202 .
- the hub 202 c of the first sheave member 202 extends centrally generally in a perpendicular fashion from the second surface 202 b of the first sheave member 202 .
- the second sheave member 204 includes a second conical-faced surface 204 a and a third surface 204 b opposite the second conical-faced surface.
- the second sheave member 204 of this embodiment includes a cam assembly 204 c.
- the cam assembly 206 extends centrally from the second conical-faced surface 204 a in generally a perpendicular fashion.
- the cam assembly 206 in this embodiment is integrated into a hub of the second sheave member 204 .
- the cam assembly 204 c includes cam profile surfaces 205 a and 205 b similar to cam 106 described above.
- Cam holding rods 206 a and 206 b are coupled to the first sheave member 202 (this is further illustrated in FIGS. 8 b and 8 C).
- the Cam holding rods 206 a and 206 b hold respective cam rollers 208 a and 208 b.
- each cam roller 208 a and 208 b is posted on portion of a respective holding rod 206 a and 206 b.
- a washer 210 a and 210 b is then placed on the respective cam holding rod 206 a and 206 b.
- a C-clip 212 a and 212 b is then clipped in a respective groove 209 a and 209 b in the respective can holding rod 206 a and 206 b to hold the respective cam roller 208 a and 208 b on the respective cam holding rod 206 a and 206 b.
- Bearings 214 and 216 are positioned around inner surfaces of the second sheave member 204 to engage an input shaft of a transmission.
- FIG. 8A are a biasing member 218 and a bias cap 220 .
- the bias retaining cap 220 a includes a central opening to receive an input shaft of a transmission.
- the bias retaining cap 220 is designed to abut an end of the biasing member 218 .
- the cam holding rods 206 a and 206 b and cam rollers 208 a and 208 b are assembled to the first sheave member 202 in one embodiment through the first opening 202 d and into the chamber 202 e of the first sheave member 202 .
- FIGS. 8B and 8C illustrates a cross-sectional side view of clutch 200 .
- FIG. 8A illustrated the first and second conical faced surfaces 202 a and 202 b of the first and second sheave members 202 and 204 being positioned near each other.
- FIG. 8C illustrates the first and second conical faced surfaces 202 a and 202 b of the first and second sheave members 202 and 204 being positioned apart from each other (which would happen as torque on the clutch 200 increases).
- the clutch 200 comes in four different parts that are assembled on an input shaft to a transmission.
- the four parts are the bias retaining cap 220 , the bias member 218 , the second (movable) sheave member 204 and the first (stationary) sheave member 202 . Similar to clutch 100 discussed above, this embodiment also forms a central passage 225 along a longitudinal axis 251 that is configured to receive an input shaft of a transmission as illustrated in FIGS. 9A and 9B .
- FIGS. 9A and 9B cross-sectional illustrations of the clutch 200 coupled to an input shaft 230 of a transmission (not shown) is illustrated.
- FIG. 9A illustrates, the first and second conical faced surfaces 202 a and 202 b of the first and second sheave member 202 and 204 being positioned near each other.
- FIG. 9A illustrates, the first and second conical faced surfaces 202 a and 202 b of the first and second sheave member 202 and 204 being positioned near each other.
- FIG. 9A illustrates, the first and second conical faced surfaces 202 a and 202
- FIGS. 9A and 9B illustrates the first and second conical faced surfaces 202 a and 202 b of the first and second sheave member 202 and 204 being positioned apart from each other (which would happen as the torque on the clutch 200 increases).
- an end surface about the central opening 220 a of the bias retaining cap 220 abuts a shoulder 230 a of the input shaft 230 to retain the bias retaining cap 220 in a static position in relation to the input shaft 230 .
- Splines 230 b proximate an end of the input shaft 230 engage interior gear (splines) of the first sheave member 202 to lock rotation of input shaft 230 with rotation of the clutch 200 .
- Movement of the second (movable) sheave member 204 along the length of the input shaft 230 in relation to the first (stationary) sheave member 202 is similar to that described above in regards to clutch 100 .
- the clutch 200 is balanced by first mounting the four pieces as described above on a test input shaft and then balanced as described above in FIG. 6 . Once, the balancing is complete, the clutch 200 is unassembled from the test input shaft and packaged for sale.
- FIG. 10 illustrates yet another embodiment of an untied CVC 300 .
- clutch 300 includes a first (stationary) sheave member 302 and a second (movable) sheave member 304 that has a cam assembly 304 c for a hub.
- the first sheave member 302 includes a first conical-faced surface 302 a, a second surface 302 b opposite the first conical-faced surface 302 a and a hub 302 c centrally extending from the second surface in generally a perpendicular fashion.
- Cam holding rods 306 a and 306 b are coupled to the first sheave member 302 .
- the Cam holding rods 206 a and 306 b in turn rotationally hold cam rollers 308 a and 308 b.
- the cam rollers 308 a and 308 b engage respective cam profiles in the cam assembly 304 c of the second sheave member 302 that is received in the hub 302 c of the first sheave member 302 .
- the second sheave member 304 further includes a second conical-faced surface 304 a that extends from the cam assembly 302 c and a third surface 304 b that is opposite the second conical faced surface 304 a.
- Clutch 300 further includes a tubular translate support 328 that holds the first sheave member 302 , the second sheave member 304 , the biasing member 318 and the bias retaining cap 320 together as one unit.
- the translate support includes an outer surface 328 c and an inner surface 328 d.
- bearings 312 and 316 are positioned between the second sheave member 304 and the outer surface 328 c of the translate support 328 .
- a section of the outer surface 328 c of the translate support 328 near a first end 328 e of the translate support 328 includes external splines 332 that engage internal splines 330 of the hub 302 c of the first sheave member 302 to lock rotation of the translate support 328 with rotation of the first sheave member 302 .
- a first groove 336 in the outer surface 328 c of the translate support 328 receiving a protrusion in the hub 302 c of the first sheave member 302 retains the translate support 328 within the clutch 300 .
- the first groove 336 in this embodiment is near the first end 328 e of the translate support 328 .
- the outer surface 328 c of the translate support 328 includes a second groove 326 that is proximate a second end 328 f of the translate support 328 .
- a C-clip 324 fits in the second groove 326 to retain the bias retaining cap 324 in a static position on the translate support 328 .
- the translate support 328 further has an opening 328 b to a central passage 325 along a longitudinal rotational axis 351 of the clutch 300 that is designed to receive a transmission input shaft (not shown). Spines on the input shaft engage interior spines 328 a on the inner surface 328 d of the translate support 328 to lock rotation of the transmission input shaft to the rotation of the translate support 328 . Balancing of clutch 300 is done similar to that described in regards to FIG. 6 above. Clutch 300 provides an untied clutch 300 that can be pre-balance and be pre-assembled.
Abstract
A continuous variable clutch is provided. The continuous variable clutch includes a first sheave member and a second sheave member. The first sheave member includes a first central hub and a first conical-faced surface extending radially from the first central hub. The second sheave member includes a second central hub and a second conical-faced surface that extends radially from the second central hub. The second central hub of the second sheave member is received in a cavity of the first central hub such that the first conical-faced surface of the first sheave member facing the second conical-faced surface of the second sheave portion. The second central hub moving axially within the first central hub based on an amount of torque on the continuous variable clutch. The first sheave member and the second sheave member further forming a central passage to receive an input shaft of a transmission.
Description
- This application claims priority to and is a divisional application of U.S. patent application Ser. No. 12/722,919, filed Mar. 12, 2010, entitled CONTINUOUS VARIABLE CLUTCH, which is herein incorporated by reference.
- A typical driven clutch sheave includes two sheave members. The first sheave member is called the stationary sheave member because it is locked to a post or shaft. The other sheave member is called moveable because it translates along the axis of the post or shaft. Typically a cam having a cam angle profile is attached to or incorporated into the moveable sheave member. The cam profile is for torque sensing. As the moveable sheave member translates along the shaft or post axis, the moveable sheave member rotates about the post and slides linearly closer to or farther away from the stationary sheave member due to the cam profile and a spring force to form a sheave that is continuous variable clutch (CVC). A CVC delivers torque by squeezing a belt tight enough to prevent slipping. The cam profile allows for the CVC to be torque sensing. The more torque that is put into the CVC the tighter the CVC squeezes the belt. This will shift the CVC into a lower ratio. Likewise when the torque drops, the CVC exerts less belt squeeze because a reaction force in the cam allows the CVC to shift into a higher ratio. Hence, the CVC has torque sensing capabilities.
- For the reasons stated above and for other reasons stated below which will become apparent to those skilled in the art upon reading and understanding the present specification, there is a need in the art for a more cost effective and efficient driven CVC.
- The above-mentioned problems of current systems are addressed by embodiments of the present invention and will be understood by reading and studying the following specification. The following summary is made by way of example and not by way of limitation. It is merely provided to aid the reader in understanding some of the aspects of the invention.
- In one embodiment, a continuous variable clutch is provided. The continuous variable clutch includes a first sheave member and a second sheave member. The first sheave member includes a first central hub and a first conical-faced surface extending radially from the first central hub. The first central hub forms a cavity. The second sheave member includes a second central hub and a second conical-faced surface that extends radially from the second central hub. The second central hub of the second sheave member is received in the cavity of the first central hub such that the first conical-faced surface of the first sheave member faces the second conical-faced surface of the second sheave portion. The second central hub of the second sheave member is further configured to move axially within the first central hub of the first sheave member based on the amount of torque on the continuous variable clutch to vary a gap distance between the first and second conical-faced surfaces. In addition, the first sheave member and the second sheave member further form a central passage to receive an input shaft of a transmission.
- The present invention can be more easily understood and further advantages and uses thereof more readily apparent, when considered in view of the detailed description and the following figures in which:
-
FIG. 1A is a front perspective view of a continuous variable clutch of one embodiment of the present invention; -
FIG. 1B is a back perspective view of the clutch ofFIG. 1A ; -
FIG. 2 is a side perspective view of the unassembled clutch ofFIG. 1 ; -
FIG. 3 is a side perspective partially unassembled view of the clutch ofFIG. 1 ; -
FIG. 4 is another side perspective partially unassembled view of the clutch ofFIG. 1 ; -
FIG. 5A is a cross-sectional side view of the assembled clutch ofFIG. 1 , illustrating sheave roller clutch positioning; -
FIG. 5B is a cross-sectional side view of the assembled clutch ofFIG. 1 , illustrating cam roller clutch positioning; -
FIG. 5C is a cross-sectional side view of an assembled clutch ofFIG. 1 , illustrating the clutch in high gear positioning; -
FIG. 6 is a balancing flow diagram of one embodiment of the present invention; -
FIG. 7A is a cross-sectional side view of an assembled clutch ofFIG. 1 and an input shaft of a transmission; -
FIG. 7B is a cross-sectional side view of an assembled clutch ofFIG. 1 and an input shaft of a transmission engaged with the clutch; -
FIG. 8A is side perspective view of a cross-sectional side view of an unassembled continuous variable clutch of another embodiment of the present invention; -
FIG. 8B and 8C are cross-sectional side views of the clutch ofFIG. 8A ; -
FIGS. 9A and 9B are cross-sectional side views of the clutch ofFIG. 8A engaged with an input shaft of a transmission; and -
FIG. 10 is a cross-sectional side view of yet another embodiment of a continuously variable clutch of another embodiment of the present invention. - In accordance with common practice, the various described features are not drawn to scale but are drawn to emphasize specific features relevant to the present invention. Reference characters denote like elements throughout Figures and text.
- In the following detailed description, reference is made to the accompanying drawings, which form a part hereof, and in which is shown by way of illustration specific embodiments in which the inventions may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention, and it is to be understood that other embodiments may be utilized and that changes may be made without departing from the spirit and scope of the present invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is defined only by the claims and equivalents thereof.
- Embodiments of the present invention provide continuous variable clutches (CVCs) without a sheave member of the CVC being coupled stationary to a center post. In embodiments, sheave members are designed to be in direct rotational communication with a transmission shaft. In particular, embodiments of the clutches form a central passage that is designed to engage an input shaft of a transmission. Benefits of this design include the use of smaller central passages through the CVC. This provides better length to diameter ratio of bushing used in the CVC, reduced costs since the post is no longer needed, a reduction in weight of about 15% over a typical CVC, less rotational inertia which results in a better response and better overall performance than a typical CVC. A further advantage of embodiments, as further discussed below, is that embodiments of the CVC can be pre-balanced as a unit before they are coupled to a transmission. Hence, they can be shipped pre-balanced and then simply coupled to a transmission at a remote location without the need for matched sets of balanced sheaves.
-
FIGS. 1A , 1B and 2 illustrate an embodiment of aCVC 100 with no relative motion. In particular,FIG. 1A is a front perspective view of theCVC 100 andFIG. 1B is a back view of theCVC 100.FIG. 2 is an unassembled side view of theCVC 100. With a clutch 100 with no relative motion, thesheaves sheaves sheaves -
Clutch 100 includes afirst sheave member 102 and asecond sheave member 104. In embodiments, thesecond sheave member 104 selectively moves longitudinally (axially) in relation to thefirst sheave member 102 as discussed further below. Thefirst sheave member 102 includes a firstcentral hub 102 b having a firstcentral opening 102 d to achamber 102 d and a first conicalfaced surface 102 a. The first conicalfaced surface 102 a extends radially from the firstcentral hub 102 b about thecentral opening 102 d. Moreover, the firstcentral hub 102 b extends from the firstcentral opening 102 d in generally a direction that is perpendicular in relation to the first conicalfaced surface 102 a. Further, the first conicalfaced surface 102 a faces a direction that is opposite from the direction the firstcentral hub 102 b extends from the firstcentral opening 102 d. Thesecond sheave member 104 includes a secondcentral hub 104 b having a firstcentral opening 104 e and a second conicalfaced surface 104 a. The second conicalfaced surface 104 a extends radially from the firstcentral opening 104 e of the secondcentral hub 104 b. Moreover, the secondcentral hub 104 b extends from the firstcentral opening 104 e in generally a direction that is perpendicular in relation to the second conicalfaced surface 104 a. Further the second conicalfaced surface 104 a of thesecond sheave member 104 faces the direction the secondcentral hub 104 b extends from the firstcentral opening 104 e of the second conicalfaced surface 104 a. The secondcentral hub 104 b of thesecond sheave member 104 is positioned in the firstcentral hub 102 b of thefirst sheave member 102 such that the first conicalfaced surface 102 a of thefirst sheave member 102 faces the second conicalfaced member 104 a of the secondconical member 104. - Referring to
FIG. 1A , the firstcentral hub 102 b of thefirst sheave member 102 has a second hubcentral opening 102 c. The firstcentral hub 102 b of thefirst sheave member 102 further has opposed first andsecond side slots first sheave roller 120 a is received in thefirst side slot 121 a and asecond sheave roller 120 b is received in thesecond side slot 121 b. The first andsecond sheave rollers FIG. 1B illustrates, acam cover 106 d of acam assembly 106 is coupled to thesecond sheave member 104. Referring to the unassembled view ofFIG. 2 , the secondcentral hub 104 b of thesecond sheave member 104 is designed to be received in acavity 102 e formed by the firstcentral hub 102 b of thefirst sheave member 102 as discussed above. The secondcentral hub 104 b includes opposed first andsecond bores FIG. 5A ). Thebores slots central hub 102 b of thefirst sheave member 102. Thefirst sheave roller 120 a that is received in thefirst side slot 121 a of thefirst sheave member 102 includes a first sheave rollercentral passage 117 a. Thesecond sheave roller 120 b that is received in thesecond side slot 121 b of thefirst sheave member 102 a includes a second sheave rollercentral passage 117 b. A first sheave rollerclutch fastener 118 a passes through the first sheave rollercentral passage 117 a of thefirst sheave roller 120 a and into thefirst bore 104 d in thesecond hub 104 b of thesecond sheave member 104. Asecond roller fastener 118 b passes through the second sheave rollercentral passage 117 b of thesecond sheave roller 120 b and into thesecond bore 104 g in thesecond hub 104 b of thesecond sheave member 104.Pins fasteners central hub 104 b to retain thefasteners second sheave member 104 as further illustrated inFIG. 5A . This operatively forms a connector that connects thefirst sheave member 102 to thesecond sheave member 104 via the first andsecond sheave rollers second sheave portions second sheave portions second sheave members second sheave member 104 moves longitudinally. This embodiment helps prevent belt smear. - An
adjustment assembly 105 is used to selectively provide the longitudinal (axial) movement of the secondconical face surface 104 a of thesecond sheave member 104 in relation to the firstconical face surface 102 a of thefirst sheave member 102. In the embodiment illustrated inFIG. 2 , theadjustment assembly 105 includes acam assembly 106, acylindrical spider 108 and a biasingmember 112. Thecam assembly 106 includes acylindrical cam portion 106 e that extends fromcam cover 106 d. Thecam portion 106 e has first andsecond cam slots second cam slots cam cover 106 d is coupled to thesecond sheave member 104 by a plurality offasteners 128. Thecylindrical spider 108 has opposed first andsecond shafts second shafts outer surface 107 of thespider 108. Thespider 108 further includes acentral spider passage 108 c. An inner surface of thespider 108 that defines thecentral spider passage 108 c includes a plurality of grooves that form internal gears (i.e. internal splines) configured to engage exterior splines on an input shaft of a transmission. - The
adjustment assembly 105 further includes afirst cam roller 110 a. Thefirst cam roller 110 a includes a first camcentral passage 111 a (shown inFIG. 5B ). Thefirst shaft 108 a of thespider 108 is received in the first camcentral passage 111 a of thefirst cam roller 110 a. Thefirst cam roller 110 a is further received in thefirst cam slot 106 a of thecam portion 106 e of thecam assembly 106. A first cam roller fastener includes a first C-clip 126 a andwasher 124 a engages thefirst shaft 108 a of thespider 108 to retain the first cam roller clutch 110 a on thefirst shaft 108. Theadjustment assembly 100 also includes asecond cam roller 110 b (shown inFIG. 5B ). Thesecond cam roller 110 b includes a second camcentral passage 111 b. Thesecond shaft 108 b of thespider 108 is received in thesecond cam passage 111 b of thesecond cam roller 110 b. Thesecond cam roller 110 b further is received in thesecond cam slot 106 b of thecam portion 106 e of thecam assembly 106. A second cam roller fastener includes a second C-clip 126 b and asecond washer 124 b that engage thesecond shaft 108 b of thespider 108 to retain thesecond cam roller 110 b on thesecond shaft 108 b of thespider 108. A biasingmember 112 is positioned between an inner surface of thesecond hub 104 b of thesecond sheave member 104 and a surface of thespider 108. The biasingmember 112 exerts a biasing force on thespider 108 to position the secondconical face surface 104 a of thesecond sheave member 104 near the firstconical face surface 102 a of thefirst sheave member 102. Thesecond hub 104 b of thesecond sheave member 104 forms achamber 104 f. Thecam portion 106 e of thecam assembly 106, thespider 108, thecam rollers member 112 are received inchamber 104 f of thesecond sheave member 104. - Referring to
FIG. 3 , a side perspective partially unassembled view of the clutch with norelative motion 100 is illustrated. As illustrated, thesecond hub 104 b of thesecond sheave member 104 is positioned to be received inchamber 102 e of thefirst hub 102 a of thefirst sheave member 102. Also illustrated, are thefirst cam roller 110 a and thesecond cam roller 110 b of thespider 108 respectfully aligned withcam slots cam assembly 106. InFIG. 4 , thespider 108 is illustrated as being inserted within thecam portion 106 e of thecam assembly 106 withroller clutches cam slots cam portion 106 e of thecam assembly 106. Each of thecam slots respective cam rollers cam slot surface 304 is engaged when an engine (not shown) is driving a vehicle (not shown) containingclutch 100. The secondcam slot surface 302 is engaged when the vehicle is implementing engine braking. By changing thecam slot surface 302 profile, the amount of engine braking can be varied. Further discussion of the effect of the cam slot surfaces 302 and 304 are described in commonly assigned U.S. Pat. No. 6,743,129 which is incorporated in its entirety herein. -
FIG. 5A illustrates a cross-sectional side view of an assembled clutch with norelative motion 100. In particular,FIG. 5A illustratespins fasteners second sheave member 104. As discussed above,fasteners second sheave rollers slots central hub 102 b of thefirst sheave member 102 to slidably couple thefirst sheave member 102 to thesecond sheave member 104.FIG. 5A also illustrates the positioning of bearing 116 about opening 102 c of the firstcentral hub 102 b, bearing 114 in a second central opening 104 g (shown inFIG. 3 ) of the secondcentral hub 104 b and bearing 115 in opening 106 c of thecam 106. Thebearings input shaft 700 of a transmission which is further discussed below in regards toFIGS. 7A and 7B .FIG. 5A also illustrates asheave pocket 131 that is designed to receive athrust bushing 154 and load washer 152 (illustrated inFIG. 7B ) that help retain the clutch 100 on a transmission shaft due to axial forces. -
FIG. 5B further illustrates the cross-sectional side view of an assembled clutch with norelative motion 100. This view illustrates the positioning of the first andsecond roller clutches second cam slots cam 106. In this position, the clutch 100 is set for low gearing with the first and second conically facedsurfaces second sheave members surfaces longitudinal axis 502 of the clutch 100. The drive belt may be an endless V-shaped belt known in the art that connects a drive element to a driven clutch such asclutch 100. In the position illustrated inFIG. 5B , the biasingmember 112 is extended pushing thespider 108 away from an inner front surface of the secondcentral hub 104 b of thesecond hub 104 which in turn positions the first and second conical faced surface next to each other.FIG. 5C illustrated the clutch 100 in a high gearing configuration where a drive belt (not shown) would ride low (closer to the longitudinal axis 502) on the first and second conical facedsurfaces central hub 104 b of thesecond sheave member 104. In this position, the first andsecond rollers cam slots cam 106 thereby compressing biasingmember 112. Rotational forces delivered by the drive belt (not shown) move the first andsecond rollers cam slots cam 106 to counter the biasing force of the biasingmember 112. The cam profile and the biasingmember 112 work together as a torque sensing unit. The biasingmember 112 in this embodiment is a spring. - In practice, once the clutch 100 has been assembled, it can be balanced before it leaves the manufacture. Referring to
FIG. 6 a balancing flow diagram 600 of one embodiment is illustrated. The clutch 100 is temporally mounted on a test shaft in balancingmachine 602. The conical-shapedfaces sheaves sheave 102 and 104 (606). If an imbalance is detected (606), the balancing machine determines the location to remove material and the amount of material to remove (608). Hence, the balancing machine calculates the amount of mass required to be removed from asheave respective sheave member 102 or 104 (610) and then rechecks the value (606). Balancing of the clutch 100 reduces vibration during use and premature failures. Once the tied clutch 100 is balanced (606), it is removed from the balancing machine and the rotation shaft. It is then ready to be shipped to the customer assembled and pre-balanced (612). -
FIG. 7A illustrates aninput shaft 700 of a transmission (not shown) that is aligned with acentral passage 125 along the longitudinalrotational axis 502 formed in the clutch 100 that is accessed by thecentral opening 106 c in thecover 106 d of thecam assembly 106. Theinput shaft 700 of the transmission further includesexterior splines 702, ashoulder 706 and acentral bore 704. Thecentral bore 704 ofinput shaft 700 includes a threaded bore portion that selectively engagesexternal threads 156 of abolt 150 used to hold theshaft 700 in the clutch 100 via aload washer 152 and athrust bushing 154 that is received inrecess 131 of thefirst sheave 102, as illustrated inFIG. 7B .FIG. 7B illustrates theinput shaft 700 of the transmission being received in the tiedclutch 100. Theexterior spline 702 of theinput shaft 700 of the transmission engages the internal splines in thecentral passage 108 c of thespider 108 such that rotation of thespider 108 rotates thetransmission input shaft 700. As illustrated inFIG. 5B , the secondcentral opening 102 c in the firstcentral hub 102 b of thefirst sheave member 102 is aligned with a central opening 104 h in thesecond hub 104 b of thesecond sheave member 104. Further, thecentral opening 108 c of thespider 108 and the central opening to the camcentral opening 106 c of thecam cover 106 d are further aligned to form thecentral passage 125 to receive theinput shaft 700 of the transmission. In the embodiment illustrated,bearings input shaft 700. In particular,bearings 116 in the secondcentral opening 102 c of thefirst hub 102 b engages a first surface portion of theinput shaft 700, bearing 114 in central opening 104 h of thesecond hub 104 b of thesecond sheave member 104 engages another surface portion of theinput shaft 700 and bearing 115 incentral opening 106 to thecam cover 106 d engages yet another surface portion of theinput shaft 700. - In operation, the second (moving)
sheave member 104 and thecam assembly 106 translates along a length of theinput shaft 700 to either open up or close down a gap between the first and second conical faces 102 a and 104 a of the first andsecond sheaves spider 108 engage thesplines 702 of theinput shaft 700 therein locking rotation of thespider 108 with rotation of theinput shaft 700. In addition,shoulder 706 of theinput shaft 700 abuts an end surface of thespider 108 thereby preventing thespider 108 from translating along a length of theinput shaft 700. Assheave 104 and thecam assembly 106 translate along theinput shaft 700 there is a slight rotation relative to theinput shaft 700. Thefirst sheave 102, thesecond sheave 104 and thecam assembly 106 rotate together to the degree of the profile surfaces (helix) 302, 304 on thecam assembly 106. The faster thesheave 104 andcam assembly 106 rotates (i.e. the more torque applied), the more the biasingmember 112 is compressed thereby increasing the force of thecam 108 onshoulder 706 of theinput shaft 700 and the gap between the first and second conical faces 102 a and 104 a of the first andsecond sheaves - Referring to
FIG. 8A an exploded side perspective view of another embodiment of aCVC 200 is illustrated. In this embodiment, a first (stationary)sheave member 202 is not tied together with a second (movable)sheave member 204. However, like the embodiment discussed above, this non-tied clutch 200 does not include a central post. Thefirst sheave member 202 includes ahub 202 c with afirst opening 202 d to achamber 202 e. A first conical-facedsurface 202 a of thefirst sheave member 202 extends radially from thefirst opening 202 d. Opposite the first conical-facedsurface 202 a is asecond surface 202 b of thefirst sheave member 202. Thehub 202 c of thefirst sheave member 202 extends centrally generally in a perpendicular fashion from thesecond surface 202 b of thefirst sheave member 202. Thesecond sheave member 204 includes a second conical-facedsurface 204 a and athird surface 204 b opposite the second conical-faced surface. Thesecond sheave member 204 of this embodiment includes acam assembly 204 c. The cam assembly 206 extends centrally from the second conical-facedsurface 204 a in generally a perpendicular fashion. Hence, unlike the embodiment described above with aseparate cam assembly 106, the cam assembly 206 in this embodiment is integrated into a hub of thesecond sheave member 204. Thecam assembly 204 c includes cam profile surfaces 205 a and 205 b similar tocam 106 described above. -
Cam holding rods FIGS. 8 b and 8C). TheCam holding rods respective cam rollers cam roller respective holding rod washer cam holding rod clip respective groove can holding rod respective cam roller cam holding rod Bearings second sheave member 204 to engage an input shaft of a transmission. Further illustrated inFIG. 8A are a biasingmember 218 and abias cap 220. Thebias retaining cap 220 a includes a central opening to receive an input shaft of a transmission. Thebias retaining cap 220 is designed to abut an end of the biasingmember 218. Thecam holding rods cam rollers first sheave member 202 in one embodiment through thefirst opening 202 d and into thechamber 202 e of thefirst sheave member 202. -
FIGS. 8B and 8C illustrates a cross-sectional side view ofclutch 200. In particular,FIG. 8A illustrated the first and second conical facedsurfaces second sheave members FIG. 8C illustrates the first and second conical facedsurfaces second sheave members bias retaining cap 220, thebias member 218, the second (movable)sheave member 204 and the first (stationary)sheave member 202. Similar to clutch 100 discussed above, this embodiment also forms acentral passage 225 along alongitudinal axis 251 that is configured to receive an input shaft of a transmission as illustrated inFIGS. 9A and 9B . Referring toFIGS. 9A and 9B cross-sectional illustrations of the clutch 200 coupled to aninput shaft 230 of a transmission (not shown) is illustrated. In particular,FIG. 9A illustrates, the first and second conical facedsurfaces second sheave member FIG. 9B illustrates the first and second conical facedsurfaces second sheave member FIGS. 9A and 9B , an end surface about thecentral opening 220 a of thebias retaining cap 220 abuts ashoulder 230 a of theinput shaft 230 to retain thebias retaining cap 220 in a static position in relation to theinput shaft 230.Splines 230 b proximate an end of theinput shaft 230 engage interior gear (splines) of thefirst sheave member 202 to lock rotation ofinput shaft 230 with rotation of the clutch 200. Movement of the second (movable)sheave member 204 along the length of theinput shaft 230 in relation to the first (stationary)sheave member 202 is similar to that described above in regards to clutch 100. In the clutch 200 embodiment, the clutch 200 is balanced by first mounting the four pieces as described above on a test input shaft and then balanced as described above inFIG. 6 . Once, the balancing is complete, the clutch 200 is unassembled from the test input shaft and packaged for sale. -
FIG. 10 illustrates yet another embodiment of an untiedCVC 300. Similar to clutch 200, clutch 300 includes a first (stationary)sheave member 302 and a second (movable)sheave member 304 that has acam assembly 304 c for a hub. In particular, thefirst sheave member 302 includes a first conical-facedsurface 302 a, asecond surface 302 b opposite the first conical-facedsurface 302 a and ahub 302 c centrally extending from the second surface in generally a perpendicular fashion.Cam holding rods first sheave member 302. TheCam holding rods hold cam rollers cam rollers cam assembly 304 c of thesecond sheave member 302 that is received in thehub 302 c of thefirst sheave member 302. Thesecond sheave member 304 further includes a second conical-facedsurface 304 a that extends from thecam assembly 302 c and athird surface 304 b that is opposite the second conicalfaced surface 304 a. -
Clutch 300 further includes a tubular translatesupport 328 that holds thefirst sheave member 302, thesecond sheave member 304, the biasingmember 318 and thebias retaining cap 320 together as one unit. The translate support includes anouter surface 328 c and aninner surface 328 d. In the embodiment ofFIG. 10 ,bearings second sheave member 304 and theouter surface 328 c of the translatesupport 328. A section of theouter surface 328 c of the translatesupport 328 near afirst end 328 e of the translatesupport 328 includesexternal splines 332 that engageinternal splines 330 of thehub 302 c of thefirst sheave member 302 to lock rotation of the translatesupport 328 with rotation of thefirst sheave member 302. Afirst groove 336 in theouter surface 328 c of the translatesupport 328 receiving a protrusion in thehub 302 c of thefirst sheave member 302 retains the translatesupport 328 within the clutch 300. Thefirst groove 336 in this embodiment is near thefirst end 328 e of the translatesupport 328. Theouter surface 328 c of the translatesupport 328 includes asecond groove 326 that is proximate asecond end 328 f of the translatesupport 328. A C-clip 324 fits in thesecond groove 326 to retain thebias retaining cap 324 in a static position on the translatesupport 328. The translatesupport 328 further has anopening 328 b to acentral passage 325 along a longitudinalrotational axis 351 of the clutch 300 that is designed to receive a transmission input shaft (not shown). Spines on the input shaft engageinterior spines 328 a on theinner surface 328 d of the translatesupport 328 to lock rotation of the transmission input shaft to the rotation of the translatesupport 328. Balancing ofclutch 300 is done similar to that described in regards toFIG. 6 above.Clutch 300 provides an untied clutch 300 that can be pre-balance and be pre-assembled. - Although specific embodiments have been illustrated and described herein, it will be appreciated by those of ordinary skill in the art that any arrangement, which is calculated to achieve the same purpose, may be substituted for the specific embodiment shown. This application is intended to cover any adaptations or variations of the present invention. Therefore, it is manifestly intended that this invention be limited only by the claims and the equivalents thereof
Claims (3)
1. A method of balancing a clutch, the method comprising:
mounting an assembled clutch on a test shaft;
rotating the test shaft;
determining if the assembled clutch is balanced; and
when the assembled clutch is determined not to be balanced, balancing the assembled clutch before engaging the assembled clutch with an input shaft of a transmission.
2. The method of claim 1 , wherein balancing the assembled clutch further comprises:
determining a location to remove material of the clutch;
determining an amount of material to be removed; and
removing the determined amount of material from the clutch at the determined location.
3. The method of claim 1 , wherein removing the determined amount of material at the determined location further comprises:
drilling out the determined amount of material at the determined location.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US13/932,852 US20130294856A1 (en) | 2010-03-12 | 2013-07-01 | Balancing of a continuous variable clutch assembly |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/722,919 US8496551B2 (en) | 2010-03-12 | 2010-03-12 | Continuous variable clutch |
US13/932,852 US20130294856A1 (en) | 2010-03-12 | 2013-07-01 | Balancing of a continuous variable clutch assembly |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US12/722,919 Division US8496551B2 (en) | 2010-03-12 | 2010-03-12 | Continuous variable clutch |
Publications (1)
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US20130294856A1 true US20130294856A1 (en) | 2013-11-07 |
Family
ID=44558897
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US12/722,919 Active 2030-07-19 US8496551B2 (en) | 2010-03-12 | 2010-03-12 | Continuous variable clutch |
US13/932,852 Abandoned US20130294856A1 (en) | 2010-03-12 | 2013-07-01 | Balancing of a continuous variable clutch assembly |
US13/932,832 Abandoned US20130288833A1 (en) | 2010-03-12 | 2013-07-01 | Continuous variable clutch |
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Application Number | Title | Priority Date | Filing Date |
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US12/722,919 Active 2030-07-19 US8496551B2 (en) | 2010-03-12 | 2010-03-12 | Continuous variable clutch |
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US13/932,832 Abandoned US20130288833A1 (en) | 2010-03-12 | 2013-07-01 | Continuous variable clutch |
Country Status (4)
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US (3) | US8496551B2 (en) |
EP (1) | EP2545300A4 (en) |
CN (1) | CN102753861A (en) |
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US20140090918A1 (en) * | 2006-07-28 | 2014-04-03 | Polaris Industries Inc. | Side-by-side atv |
US8827028B2 (en) | 2006-07-28 | 2014-09-09 | Polaris Industries Inc. | Side-by-side ATV |
US11680635B2 (en) | 2020-02-25 | 2023-06-20 | Arctic Cat Inc. | Continuously variable transmission for recreational vehicles and related components |
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US9651138B2 (en) * | 2011-09-30 | 2017-05-16 | Mtd Products Inc. | Speed control assembly for a self-propelled walk-behind lawn mower |
US8958961B2 (en) * | 2011-12-16 | 2015-02-17 | The Gates Corporation | Continuously variable transmission |
US20130157793A1 (en) * | 2011-12-16 | 2013-06-20 | Andrzej Dec | Driven Clutch System |
JP5994056B2 (en) * | 2012-07-26 | 2016-09-21 | 株式会社 神崎高級工機製作所 | Driven pulley |
FR2997155B1 (en) * | 2012-10-18 | 2014-11-14 | France Reducteurs | VARIATOR OF BELT SPEED |
FR2997154B1 (en) * | 2012-10-18 | 2016-03-04 | France Reducteurs | VARIATOR OF BELT SPEED |
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Also Published As
Publication number | Publication date |
---|---|
CN102753861A (en) | 2012-10-24 |
EP2545300A4 (en) | 2013-07-17 |
WO2011112272A8 (en) | 2011-11-10 |
US8496551B2 (en) | 2013-07-30 |
US20130288833A1 (en) | 2013-10-31 |
EP2545300A1 (en) | 2013-01-16 |
WO2011112272A1 (en) | 2011-09-15 |
US20110220453A1 (en) | 2011-09-15 |
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