TWI405920B - Stepless speed change mechanism - Google Patents

Abstract

A stepless transmission mechanism comprises: a circular transmission band, which has a front circular end and a rear circular end that are respectively fit in and connected to grooves of a front open-close disk set and a rear open-close disk set. The front open-close disk set is coupled to an input shaft of the stepless transmission mechanism. An open-close disk sleeve is coupled to an output shaft of the stepless transmission mechanism and forms a concentric and rotatably co-movable relationship with the output shaft through a retention toothed structure. The rear open-close disk set is coupled outside the open-close disk sleeve. An open-close disk spring is fit outside the open-close disk sleeve and has two ends respectively positioned against a spring retention platen that is fixed to the open-close disk sleeve and an open-close disk of the rear open-close disk set. The present invention uses an open-close disk sleeve to replace the centrifugal clutch of a conventional stepless transmission mechanism to thereby improve the operation efficiency of the stepless transmission mechanism.

Description

Stepless speed change mechanism

The present invention relates to a transmission system for an electric vehicle. More specifically, the present invention proposes a new structure and installation configuration for a stepless transmission mechanism (CVT) of the transmission system. Applicable electric vehicle fields include, but are not limited to, electric vehicles (electric locomotives, electric bicycles) traveling in the transportation field, and electric mobility vehicles (golf golf vehicles, elderly people and low-speed scooters) driving in non-traffic fields. ).

The first and second figures depict a conventional stepless shifting mechanism that is still used in gasoline-fueled saddle-mounted two-wheelers. The figure discloses a circulating transmission belt 10, the front end end of the transmission belt 10 is sleeved in a V-shaped groove of a front opening and closing disk group 11, and the rear circulation end of the transmission belt 10 is sleeved to a V of a rear opening and closing disk group 12. In the groove.

The aforementioned front opening and closing disk group 11 is coupled to a force input shaft 111 coupled to a rotary power unit (not shown) of the vehicle engine. The front opening and closing disk group 11 generally includes a stopper disk 112 and a sliding disk 113 pivotally mounted on the input force shaft 111, and the front faces of the two are opposite to each other to form the V-shaped groove. In fact, the back of the sliding plate 113 has a plurality of ball centrifugal sliding related designs. The design is a known technique, and the sliding plate 113 is radially formed by the rotation of the front opening and closing disk group 11 and the centrifugal force. The back movement, the centrifugal sliding of the balls causes the sliding disk 113 to slip relative to the stop disk 112, thereby changing the notch width of the V-shaped groove and the contact radius of the two with the front end of the belt. Basically, the faster the rotational speed of the front opening and closing disk group 11, the ball is moved to the circumference of the sliding disk 113 by the relatively increased centrifugal force, and the sliding disk 113 is slid toward the stopper disk 112 to reduce the notch width of the V-shaped groove. The contact radius of the circulation end and the front opening and closing disk group 11 before the transmission belt 10 is increased.

The rear opening and closing disk group 12 is sleeved on a power output shaft 13 . One end of the power output shaft 13 is coupled to an input gear of a reduction gear box (not shown), and the other end is pivoted to a clutch assembly 14 and a clutch assembly 14 . A centrifugal clutch 140 is included, and the centrifugal clutch 140 has a rotationally-coupled connection relationship with the rear opening and closing disk group 12. The rear opening and closing disk group 12 generally includes a stopper disk 122 pivotally disposed on the power output shaft 13 and a sliding disk 123, and the front faces of the two are opposite to each other to form the V-shaped groove. A compression spring 15 is disposed on the output shaft 13 between the sliding plate 123 and the clutch assembly 14. The compression spring 15 normally provides a pushing force to act on the sliding plate 123, so that the sliding plate 123 and the stopping plate 122 The rear end end of the belt is clamped while the compression spring 15 holds the slide disc 123 with reciprocal movement relative to the stop disc 122. The contact radius of the front opening and closing disk group 11 and the front circulation end of the transmission belt 10 is different, which will cause the contact radius of the rear circulation end of the transmission belt 10 and the rear opening and closing disk group 12 to relatively change. The larger the contact radius of the former, the smaller the contact radius of the latter (such as Figure 2), and vice versa (as in the first figure), resulting in different gear ratios.

The foregoing clutch assembly 14 further includes an outer bowl 141 and an order piece 142. The outer bowl 141 is axially positioned at an end of the output shaft 13, and the output shaft 13 has a pin configuration 131 and the outer bowl 141. Form a connection relationship of the same direction of rotation. The rear opening and closing disk group 12 rotates to rotate the centrifugal clutch 140 synchronously, so that the centrifugal actuating element (not shown) inside thereof pushes the inner piece 142 on the circumference of the clutch outward to make it tight to the outer bowl 141. Thereby, the outer bowl 141 and the output shaft 13 are rotated in synchronization.

The configuration of the clutch assembly 14 causes a problem that the aforementioned output shaft 13 is unstable in rotational motion. The main reason is that the weight of the clutch assembly 14 and the outer bowl 141 is applied to the end of the shaft of the output shaft 13, far away from the power transmission center of the V-shaped groove of the closed disc group, so that the load on the output shaft 13 is unbalanced due to the moment and The relationship between the arms and the long-term, the vertical accuracy of the output shaft 13 is deviated. Another problem is that the power of the rear opening and closing disk group 12 is indirectly transmitted by the centrifugal clutch 140 via the outer bowl 141, and the front opening and closing disk group 11 and the rear opening and closing disk group 12 are known to be driven by friction. The transmission belt 10 has a problem of loss of transmission power, and the centrifugal clutch is further transmitted to drive the outer bowl by the friction force of the sheet and the outer bowl, thereby forming another transmission loss.

As mentioned above, the clutch-type stepless transmission mechanism described above is still applied to a gasoline-fueled saddle-type two-wheeled vehicle, but has been further transferred to the field of electric motor vehicles. However, the above problems still exist, and the transmission load of the electric motor vehicle is increased due to the weight of the clutch assembly, which further increases the problem of electric energy and power consumption.

SUMMARY OF THE INVENTION The object of the present invention is to provide a new solution for a stepless shifting mechanism which does not use a clutch, thereby improving various problems caused by the use of a clutch in a conventional stepless shifting mechanism, such as unstable rotational motion of the output shaft. Transferred to electric vehicles to form transmission load and power consumption.

SUMMARY OF THE INVENTION The object of the present invention is to provide a new solution for a stepless shifting mechanism which has the advantages of simplifying the composition, installation and configuration of the stepless shifting mechanism, and reducing the weight.

The object of the present invention is to provide a new scheme of a stepless shifting mechanism which directly outputs the kinetic energy of the stepless shifting mechanism to the output shaft of the reduction gearbox of the vehicle, so that the utilization of kinetic energy is better than that of the conventional clutch type. The segment shifting mechanism is preferred.

SUMMARY OF THE INVENTION The object of the present invention is to provide a new solution for a stepless shifting mechanism which has a center for correcting the output shaft, a concentric motion with the output shaft, maintaining the stability and balance of the rotational motion of the output shaft, and reducing the load on the output shaft. The effect.

SUMMARY OF THE INVENTION The object of the present invention is to provide a new solution for a stepless shifting mechanism which is applicable to electric vehicles and travel tools due to the above effects. The electric vehicle is mainly a motor vehicle with an saddle and an electric bicycle that travels in a transportation field, but is not limited thereto. The means of travel is mainly for driving in a non-traffic field, such as an electric scooter for a golf course, a park or an elderly ride, but not limited thereto.

The main technical means for achieving the above items includes: a circulating belt, wherein the front end end and the rear end end of the belt are respectively sleeved in a groove of a front opening and closing disc group and a rear opening and closing disc group; The front opening and closing disc group is coupled to the input shaft of the stepless shifting mechanism; an opening and closing disc sleeve is coupled to the output shaft of the stepless shifting mechanism, and is formed by a bolt structure and the output shaft to form a concentric concentric relationship The rear opening and closing disk group is coupled to the outside of the opening and closing disk sleeve; an opening and closing disk spring is sleeved on the outside of the opening and closing disk sleeve, and the two ends thereof are respectively supported by a spring fixed pressure plate fixed to the opening and closing disk sleeve and An opening and closing disk of the rear opening and closing disk group; a concentric bushing assembly fixed to the output shaft and an end of the opening and closing disk bushing; the rear opening and closing disk group coupled to the output shaft including a circulating transmission belt The range of the portion of the force center portion; the bolt structure is disposed in a range of the portion of the output shaft including the center portion of the cyclic transmission belt; the axial length of the bolt structure is greater than the opening and closing stroke of the opening and closing disk group Degree.

For the convenience of the description, the central idea expressed in the column of the above summary of the present invention is expressed by a specific embodiment. Various items in the embodiments are depicted in terms of ratios, dimensions, amounts of deformation, or displacements that are suitable for illustration, and are not drawn to the proportions of actual elements, as set forth above.

As shown in the third and fourth figures, the stepless shifting mechanism of the present invention includes a circulating belt 20, and the front end of the belt 20 is sleeved in a V-shaped groove of a front opening and closing disc 30, behind the belt 20 The end cap is connected to the V-shaped groove of a rear opening and closing disk group 40.

The front opening and closing disk group 30 is coupled to a power input shaft 301 coupled to a rotary power unit (not shown) of the vehicle motor. The front opening and closing disk group 30 generally includes a stopping plate and a sliding disk pivotally mounted on the input shaft 301. The example of the sliding plate 302 and the stopping plate 303 is exemplified by the above-mentioned V shape. Groove. With the ball centrifugal slide design described in the prior art, the stop disc 303 can be controlled to slide relative to the slide disc 302, thereby changing the slot width of the V-shaped groove and the contact radius of the two with the front end of the belt.

The rear opening and closing disk group 40 includes a stopper plate 41 and a sliding plate 42. The front faces of the two are oppositely formed with the V-shaped grooves for pivoting the rear end of the belt 20. The rear opening and closing disk group 40 is in a rotationally-coupled connection relationship with an output shaft 43 by an opening and closing disk bushing 50. One end of the output shaft 43 is an actuating end, and the actuating end may be coupled to a reduction gear box or a directly drivable power.

The opening and closing disk bushing set 50 includes an opening and closing disk bushing 51, a spring fixing pressure plate 52 and a locking nut 53. The stopping plate 41 and the sliding plate 42 are sleeved on the outside of the opening and closing disk sleeve 51. The stopping plate 41 and the opening and closing disk sleeve 51 are directly fixed. The sliding plate 42 and the opening and closing disk sleeve 51 are respectively fixed. The coupling member 57 forms a rotationally coupled connection relationship and maintains the freedom of the sliding disk 42 to slide along the opening and closing disk sleeve 51.

The opening and closing disc sleeve 51 is sleeved on the outside of the output shaft 43 and forms a concentric and concentric coupling relationship with the output shaft 43 by a bolt structure 431. The rotation power transmitted by the sliding plate 42 by the transmission belt 20 can be directly The output shaft 43 is output through the opening and closing disk sleeve 51.

The position of the bolt structure 431 corresponds to the rear opening and closing disk group 40, and the force receiving position of the output shaft 43 is close to or corresponding to the range of the force center position of the endless belt 20, and based on the positional relationship, the position can be maintained. The torque of the output shaft 43 is balanced to maintain the vertical accuracy of the output shaft 43. In the illustrated example, the axial length of the pin-tooth structure 431 is greater than the length of the opening and closing stroke of the rear opening and closing disk group 40, thereby increasing the coupling area of the opening and closing disk sleeve 51 and the output shaft 43 to increase coupling stability.

In the embodiment of the present invention, the connecting member 57 is a sleeve 571 which is sleeved on the outer wall of the opening and closing disc sleeve 51. The inner wall of the sleeve 571 and the outer wall of the opening and closing disc sleeve 51 are combined with a plurality of oil seals. 572. The spring fixing platen 52 is disposed at a step of the outside of the opening and closing disk sleeve 51, and is spaced apart from the sliding plate 42 by a predetermined distance. The locking nut 53 is locked to the outside of the opening and closing disk sleeve 51 to be positioned. The spring fixing platen 52 is free from looseness. An opening and closing spring 54 is assembled on the outside of the connecting member 57 by a spring fixing ring 55 which is located outside the connecting member 57. The two ends are respectively supported by the sliding plate 42 and the spring fixing plate 52, and are normally provided. A pushing force acts on the sliding plate 42 to cause the sliding plate 42 and the stopping plate 41 to clamp the rear end of the driving belt 20, and to maintain the reciprocating movement of the sliding plate 42 relative to the stopping plate 41, thereby The slot width of the V-shaped groove is changed, and the contact radius of the V-shaped groove with the rear end of the belt 20 is changed.

The contact radius of the front opening and closing disk group 30 and the front circulation end of the transmission belt 20 is different, so that the contact radius of the rear circulation end of the transmission belt 20 and the rear opening and closing disk group 40 is relatively changed. The larger the contact radius of the former, the smaller the contact radius of the latter (such as the fourth Figure) and vice versa (as in the third figure) to get different gear ratios.

As shown in the third, fourth and fifth figures, the stepless shifting mechanism of the present invention further includes a concentric bushing 60 having a first receiving portion 61 and a second receiving portion 62 that are concentrically aligned via the center of correction. The example of the first receiving portion 61 forms a first correcting sidewall 611 and a second correcting sidewall 621 perpendicular to the inner wall of the concentric sleeve 60. The end 56 of the opening and closing disk sleeve 51 corresponds to the first receiving portion 61, and the first correcting side wall 611 abuts against the corresponding wall surface of the end 56. The shaft end of the output shaft 43 penetrates the second receiving portion 62, and the second correcting side wall 621 abuts against the outer wall of the shaft end. The output shaft 43 passes through the shaft hole of the concentric sleeve 60 to assemble a positioning member 45, whereby the concentric sleeve 60 is axially positioned at the above position. When the concentric sleeve 60 is assembled to the opening and closing disc sleeve 51 and the output shaft 43, the first correction side wall 611 and the second correction side wall 621 formed by the correction center correct the opening and closing disc sleeve 51 and the output shaft Center of 43 to achieve the purpose of concentric composition.

6 is a diagram showing a variation of the fifth figure for explaining that the correction side wall 612 is formed to have a conformal configuration with a concentric arrangement; the legend shows the first correction side wall 612 and the opening and closing disk of the concentric sleeve 60. The end 56 of the sleeve 51 forms a corresponding oblique contact of the oblique wall, and the inclined wall has a central correction function to achieve a concentric composition. Although the sixth figure is only represented by the first correction side wall 612, the second correction side wall 621 is also equivalent to the inclined wall form to achieve an equivalent implementation effect.

The structural features of the present invention and its function bars are described as follows: The present invention does not use a conventional clutch, so that various problems caused by the use of a clutch in the conventional stepless shifting mechanism can be improved.

The composition, installation and configuration of the present invention are relatively simple compared to the clutch type stepless transmission disclosed in the prior art, so that the weight of the invention is relatively light, and the load on the output shaft can be reduced, so that it can be applied to electric Vehicle or electric mobility tool and performance to reduce transmission load and power consumption.

According to the present invention, the kinetic energy of the stepless shifting mechanism is directly outputted to the output shaft through the opening and closing disc sleeve, so that the utilization of the kinetic energy is better than the conventional clutch type stepless shifting mechanism.

The invention utilizes the concentric bushing of the correction center to adjust and correct the center of the opening and closing disk bushing and the output shaft, so as to achieve the concentric movement of the stepless shifting mechanism and the output shaft, and to maintain the stable rotation of the output shaft.

The position of the bolt structure corresponds to the rear opening and closing disk group, and the force receiving position of the output shaft is close to or corresponds to the force center position of the transmission belt 20. Based on the positional relationship, the torque balance of the output shaft can be maintained, thereby maintaining The vertical accuracy of the output shaft maintains the stability and balance of the rotational motion of the output shaft and reduces the load on the output shaft.

Although the present case is illustrated by a preferred embodiment, those skilled in the art can make various forms of changes without departing from the spirit and scope of the present invention. The above embodiments are only used to illustrate the present case and are not intended to limit the scope of the present invention. All kinds of modifications or changes that are not in violation of the spirit of the case are the scope of patent application in this case.

20. . . Circulating belt

30. . . Front opening and closing group

301. . . Inlet shaft

302. . . Sliding disk

303. . . Stop plate

40. . . Rear opening and closing group

41. . . Stop plate

42. . . Sliding disk

43. . . Output shaft

431. . . Bolt construction

45. . . Positioning element

50. . . Opening and closing disc sleeve set

51. . . Opening and closing disc sleeve

52. . . Spring fixed platen

53. . . Lock nut

54. . . Open and close disk spring

55. . . Spring retaining ring

56. . . End

57. . . Connector

571. . . Cylinder sleeve

572. . . Oil seal

60. . . Concentric bushing

61. . . First receiving unit

611, 612. . . First correction sidewall

62. . . Second receiving unit

621. . . Second correction side wall

The first figure is a cross-sectional view of a conventional stepless transmission that describes the transmission ratio of the vehicle at a low speed.

The second figure is a cross-sectional view of a conventional stepless transmission that describes the transmission ratio of the vehicle at a high speed.

The third figure is a cross-sectional view of the stepless transmission of the present invention, depicting the transmission ratio of the vehicle at a low speed state.

The fourth figure is a cross-sectional view of the stepless transmission of the present invention, describing the transmission ratio of the vehicle at a high speed.

The fifth figure is a cross-sectional view of the concentric bushing of the present invention and the combination of the opening and closing disc sleeve and the output shaft.

Fig. 6 is a cross-sectional view showing a variation of the fifth figure.

20‧‧‧Circulating belt

30‧‧‧Pre-opening and closing group

301‧‧‧Inlet shaft

302‧‧‧Sliding disc

303‧‧‧stop disk

40‧‧‧After opening and closing

41‧‧‧stop disk

42‧‧‧Sliding disc

43‧‧‧Output shaft

431‧‧‧tooth structure

45‧‧‧ Positioning components

50‧‧‧Opening and closing shaft sets

51‧‧‧Open and close disk bushings

52‧‧‧Spring fixed platen

53‧‧‧Lock nut

54‧‧‧Open and close spring

55‧‧‧Spring retaining ring

57‧‧‧Connecting parts

571‧‧ ‧ sleeve

572‧‧‧ oil seal

60‧‧‧ concentric bushing

Claims (7)

The invention relates to a stepless speed change mechanism, comprising: a circulating transmission belt, wherein a front circulation end and a rear circulation end of the transmission belt are respectively sleeved in a groove of a front opening and closing disk group and a rear opening and closing disk group; the front opening and closing disk group is coupled to An input shaft of the stepless shifting mechanism; an opening and closing disc sleeve coupled to the output shaft of the stepless shifting mechanism, and configured by a bolt structure and the output shaft to be in a concentric relationship; the rear opening and closing disc group Coupling to the outside of the opening and closing disc sleeve; an opening and closing disc spring is sleeved on the outside of the opening and closing disc sleeve, and the two ends thereof are respectively supported by a spring fixed pressing plate fixed to the opening and closing disc sleeve and the rear opening and closing disc group a sliding sleeve; a concentric sleeve having a concentric first receiving portion and a second receiving portion, the first receiving portion receiving an end of the opening and closing disk sleeve, the second receiving portion receiving the output shaft The end. The stepless speed change mechanism of claim 1, wherein the first receiving portion forms a first correcting sidewall on the concentric sleeve, and the second receiving portion forms a second correcting sidewall on the concentric sleeve. The first correcting sidewall touches a wall surface opposite to the end of the opening and closing disc sleeve, and the second correcting sidewall abuts against a wall surface opposite to the end of the output shaft. The stepless speed change mechanism of claim 2, wherein at least one of the first correction side wall and the second correction side wall is a vertical side wall, and the end of the opening and closing disk sleeve and the end of the output shaft have a shape and The first correcting sidewall and the second correcting sidewall are opposite to each other. The stepless speed change mechanism of claim 2, wherein at least one of the first correction side wall and the second correction side wall is an inclined side wall, the end of the open wall bush sleeve and the end of the output shaft The end has a wall surface that is shaped to fit the first correcting sidewall and the second correcting sidewall. The stepless shifting mechanism of claim 1, wherein the rear opening and closing disc group is coupled to a section of the output shaft that includes a center portion of the belt. The stepless speed change mechanism according to claim 1, wherein the bolt structure is disposed in a section of the power output shaft including a center portion of the transmission belt, the range including a section corresponding to the rear opening and closing disk group . The stepless speed change mechanism according to claim 6, wherein the axial length of the bolt structure is greater than the length of the opening and closing stroke of the rear opening and closing disk group.