Claims:We claim:
1. A continuously variable transmission (1000) comprising:
• an input drive pulley (101),
• an output driven pulley (103),
• a centrifugal clutch assembly (1000) attached on the said driven pulley (103) side,
wherein said centrifugal clutch assembly (104) comprises a damper pin (106) arrangement.
2. The continuously variable transmission (1000) as claimed in claim 1, wherein said damper pin (106) is a moulded integrated structure of rubber damper (108) and damper pin (106).
3. The continuously variable transmission (1000) as claimed in claim 1, wherein said damper pin (106) is an interference fit of rubber damper (108) and damper pin (106).
4. The continuously variable transmission (1000) as claimed in claim 1, wherein said damper pin (106) is a one piece structure.
5. A two or three wheeled motor vehicle having said continuously variable transmission (1000) with said one piece damper pin (106) arrangement.
, Description:FIELD OF INVENTION
The present invention relates to a continuously variable transmission for a two or three wheeler motor vehicle. More particularly, the present invention relates to a one piece damper pin arrangement in the driven side of a continuously variable transmission.
BACKGROUND OF INVENTION
A continuously variable transmission is one which can continuously vary the transmission ratio without the help of gear change. It consists of a drive pulley and a driven pulley which is connected by a belt. The drive side is connected to the input shaft from the engine and the driven side to the output shaft which ultimately drives the power to wheels. A centrifugal clutch is incorporated in the driven side of the continuously variable transmission so as to allow idling condition of the vehicle.
The centrifugal clutch operatively arranged in the driven side of the continuously variable transmission provides an interruptible connection between two shafts. Damper pins are fixed at the drive plate of the centrifugal clutch and they function as the resting structure for the shoes of the centrifugal clutch which are pivoted against the pivot pin. The damper pin in the prior arts have been composed of two separate components, the pin and the rivet end.
In the prior art JP2018059585A, the support base or the drive plate in the centrifugal clutch has damper pins. The clutch shoes, which help in power transmission are pivoted on the pivot pins and they rest on the damper pins. The damper pin being a two part structure in this prior art, adds to the judder and vibration as the two piece design rubber rotates and slides on rivet.
Another prior art JP2018009675A has the drive plate with the oscillation support pins which acts as the resting structure for the shoes. Again in this prior art as well, there is no mention of one piece damper pin arrangement or the oscillation support pin. Thus due to the two part structure, there is an added judder and vibration between the components of the damper pin.
Hence, in light of the cited prior art and their limitations there is a requirement of an integrated damper pin structure in the centrifugal clutch of the continuously variable transmission.
Thus the first objective of the present invention is to provide a continuously variable transmission which will have the minimum effect of judder and rattling.
The second objective of the present invention is to manufacture a damper pin structure which is easy to manufacture.
The third objective of the present invention is to develop a one piece structure for the damper pin in the centrifugal clutch.
The final objective of the invention is to reduce the number of components in the damper pin structure.
BRIEF DESCRIPTION OF THE INVENTION
In order to achieve the above objects, the present invention provides a continuously variable transmission with one piece damper pin arrangement in the centrifugal clutch of the said continuously variable transmission, which is formed by the integration of the damper and the rivet pin. A continuously variable transmission is a combination of a drive pulley and a driven pulley, connected by a power transmission belt. The power transmission belt running on the said pulleys transfers the power from the drive side to the driven side.
Centrifugal clutch is operatively connected to the driven side of the continuously variable transmission which helps in energy transfer in the idle condition of the vehicle. Dampers are used on the driven side in centrifugal clutch assembly to dampen the vibration from the wheel, engine and other components of the vehicle.
In the present invention, the damper is made into a one piece structure by the integration of the damper portion and the rivet pin side. The integration can be done by moulding or by interference fit. This arrangement effectively reduces the judder phenomenon due to the elimination of the sliding between the components of the damper. Thus there is a substantial improvement in the judder and vibration phenomenon during the engagement phase of the centrifugal clutch.
Although the subject matter has been described in considerable detail with reference to certain preferred embodiments thereof, other embodiments are possible. As such, the spirit and scope of the appended claims should not be limited to the description of the preferred embodiment contained therein.

BRIEF DESCRIPTION OF THE DRAWINGS
Other aspects of the invention will become apparent by consideration of the accompanying drawings and their description stated below, which are merely illustrative of a preferred embodiment of the invention and do not limit in any way the nature and scope of the invention.
Figure 1 illustrates the perspective view of the continuously variable transmission according to the present invention.
Figure 2 illustrates the perspective view of the centrifugal clutch operatively attached to the driven side of the continuously variable transmission in the according to the present invention.
Figure 3 illustrates the front view of the drive plate of the centrifugal clutch according to the present invention.
Figure 4a illustrates the perspective view of the drive plate of the centrifugal clutch along with the damper pin according to the present invention.
Figure 4b illustrates the front view of the drive plate of the centrifugal clutch along with the damper pin according to the present invention.
Figure 5a illustrates the side view of the drive plate of the centrifugal clutch along with the damper pin according to the present invention.
Figure 5b illustrates the magnified view of portion ‘D’ of the drive plate of the centrifugal clutch (as in figure 5a) along with the rubber damper and the damper pin in accordance with the present invention.
DETAILED DESCRIPTION OF THE DRAWINGS
The invention will now be described with reference to the accompanying drawings which do not limit the scope and ambit of the invention. The description provided is purely by way of example and illustration.
According to Figure 1, the continuously variable transmission (1000) according to the present invention comprises a drive pulley (101) and a driven pulley (103). A power transmission belt (102) is placed in the grooves (110) of the said pulley. The drive pulley (101) is connected to the crankshaft of the engine (not shown in the diagram) and is called the input pulley as it's where the power from the engine gets transferred to the transmission. The driven pulley (103) transfers the power to the driveshaft (112). A rear driven assembly (109) which is the combination of rear driven pulley and the centrifugal clutch assembly (104) is operatively connected to the driven end of the continuously variable transmission (1000).
The Figure 2 depicts the centrifugal clutch assembly (104) which is operatively connected to the driven side of the continuously variable transmission (1000) as shown in the Figure 1. The power from engine (not shown in the diagram) gets transferred to the drive pulley (101) and then to the driven pulley (103) by the power transmission belt (102). The centrifugal clutch assembly (104) helps in further transfer of the power from the driven pulley (103) to the wheels. The centrifugal clutch assembly (104) comprises clutch shoes (114) which are pivoted on the pivot pin (107). The drive plate (105) as also shown in Figure 3, comprises the pivot pins (107) and the damper pins (106). The clutch shoes (114) which are pivoted on the pivot pins (107) rests on the damper pins (106).
The perspective view and the front view of the drive plate (105) of the centrifugal clutch assembly (104) as shown in the Figure 4a and 4b respectively, comprises of both damper pins (106) and pivot pins (107) (as shown in Figure 3). The given drive plate (105) has an arrangement of the damper pins (105) on which the clutch shoes (114) rests. These damper pin (106) also facilitates in damping force absorption in the entire continuously variable transmission (1000).
Figure 5a shows the side view of the integrated damper pin arrangement which is the actual invention in accordance with the present application. The magnified view of the damper pin (106) arrangement as in Figure 5b shows the integrated one piece structure of the damper pin (106). The integrated structure is the combination of the rubber damper (108) and the damper pin (106), which can either be a moulded structure or an interference fit of the two. This kind of structure is to be used in any two or three wheeled motor vehicle.
The technical advancements offered by the present disclosure include:
• The present invention results in elimination of the relative movement between the damper and the rivet pin.
• The integrated arrangement results in the reduction of the judder phenomenon to a large extent.
• The arrangement reduces the wear and tear of the components of the centrifugal clutch assembly.
• The one piece structure of the damper pin results in simpler structure than the two piece damper and rivet pin arrangement.
While considerable emphasis has been placed herein on the specific features of the preferred embodiment, it will be appreciated that many additional features can be added and that many changes can be made in the preferred embodiment without departing from the principles of the disclosure. These and other changes in the preferred embodiment of the disclosure will be apparent to those skilled in the art from the disclosure herein, whereby it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the disclosure and not as a limitation.

LIST OF REFERENCE NUMERAL
101-Drive Pulley
102-Power Transmission Belt
103-Driven Pulley
104-Centrifugal Clutch Assembly
105-Drive Plate
106-Damper Pin
107-Pivot Pin
108-Rubber Damper
109-Rear Driven Assembly
110-Grooves
112-To the Driveshaft
114-Clutch shoes
1000-Complete View of CVT
2000-Complete View of Centrifugal Clutch