WO2017135046A1

WO2017135046A1 - Belt-type stepless transmission

Info

Publication number: WO2017135046A1
Application number: PCT/JP2017/001711
Authority: WO
Inventors: 西村　学; 晃尚岡本; 圭宏吉田
Original assignee: 武蔵精密工業株式会社
Priority date: 2016-02-02
Filing date: 2017-01-19
Publication date: 2017-08-10
Also published as: JP2017137910A

Abstract

In a belt-type stepless transmission, a ball joint (9) has: a ball housing (25) provided to a threaded shaft (19); a seat member (26) accommodated within the ball housing (25); a ball bearing (27) held in a rockable manner by the seat member (26); and a connection pin (28) extending from an arm (13) and fitted in the ball bearing (27). A through-hole (30) through which the connection pin (28) extends is provided in the ball housing (25). A first stopper surface (32) is provided on the inner periphery of the through-hole (30), the first stopper surface (32) coming in contact with the outer peripheral surface (28c) of the connection pin (28) to restrict the angle of rotation of the threaded shaft (19) about an axis (X1) to a predetermined angle α. As a result, a pulley can be driven while the rotational force of the motor is accurately converted into the thrust of the threaded shaft.

Description

Belt type continuously variable transmission

In the present invention, the drive pulley supported by the input shaft, the driven pulley supported by the output shaft, the belt wound around both the pulleys, and the groove width of any one of the two pulleys can be changed. The present invention relates to an improvement of a belt type continuously variable transmission including a simple actuator.

As such a belt-type continuously variable transmission, as disclosed in Patent Document 1 below, an arm that transmits an actuator driving force to a pulley is provided, and an arm and an output rod of the actuator are connected via a ball joint. Is already known.

Japanese Unexamined Patent Publication No. 2015-92100

The actuator disclosed in Patent Document 1 includes a nut member that rotates by receiving the rotational force of the motor and a male screw that is screwed to the nut member in order to convert the rotational force of the motor into thrust of the output rod. A screw shaft that converts the rotational motion of the member into linear motion, and this screw shaft is considered to be configured as an output rod. In this case, the arm and the screw shaft are connected via a ball joint. Because the screw shaft rotates together with the rotation of the nut member, the rotational force of the motor cannot be accurately converted to the thrust of the screw shaft, and the pulley can be driven accurately. Hinder.

The present invention has been made in view of such circumstances, and an object of the present invention is to obtain a belt-type continuously variable transmission that can drive a pulley by accurately converting the rotational force of a motor to the thrust of a screw shaft. To do.

In order to achieve the above object, the present invention provides a drive pulley supported by an input shaft, a driven pulley supported by an output shaft, a belt wound around both pulleys, and any one of the two pulleys. An actuator capable of changing the groove width of the pulley by driving one pulley, and an arm for transmitting the driving force of the actuator to any one of the pulleys. A rotating nut member; and a screw shaft that drives the pulley by converting the rotational motion of the nut member into a linear motion by a male screw threadedly engaged with the nut member, the arm and the screw shaft Are connected to each other via a ball joint, wherein the ball joint includes a ball housing provided on the screw shaft, and the ball A through hole through which the connecting pin passes, having a seat member accommodated in the wing, a ball bearing that is swingably held by the seat member, and a connecting pin that extends from the arm and is fitted into the ball bearing Is provided on the ball housing, and a first stopper surface is provided on the inner periphery of the through-hole to restrict the rotation angle around the axis of the screw shaft to a constant angle α by contacting the outer periphery of the connecting pin. This is the first feature.

The rotation angle around the axis of the screw shaft refers to the rotation angle of the axis of the ball housing relative to the axis of the connecting pin.

According to the present invention, in addition to the first feature, the first stopper surface is an inclined surface that is inclined with respect to the axis of the ball housing and contacts the outer peripheral surface of the connecting pin in a line contact state. The second feature.

According to the present invention, in addition to the first or second feature, the through hole is provided on a side facing the arm, and is a tapered hole having a large diameter toward the outer side of the ball housing. The third feature.

According to the present invention, in addition to any of the first to third features, one end of the connection pin is fixed to the arm and the other end of the connection pin is connected to a connection hole provided in the ball bearing. The ball housing is provided with a second stopper surface that is detachably inserted, and in contact with the ball bearing when the connecting pin is not inserted into the connecting hole, thereby restricting the swing angle of the ball bearing to a constant angle β. The fourth feature is that the angle β is set to an angle at which the connecting pin can be inserted into the connecting hole from the through hole.

The swing angle of the ball bearing means the swing angle of the axis of the ball bearing with respect to the axis of the ball housing, more specifically, the swing angle of the axis of the connecting hole with respect to the axis of the through hole.

In addition to the fourth feature, the present invention has a fifth feature that the angle α and the angle β are set as α <β.

In addition to any one of the first to fifth features, the present invention provides a rotation angle around the axis of the screw shaft by contacting the ball housing in a non-inserted state of the connecting pin to the ball bearing. A sixth feature is that a detent that restricts the angle to a constant angle γ is provided in a unit case that forms the outer shell of the actuator.

In addition to the sixth feature of the present invention, the seventh feature is that the angle α and the angle γ are set as α <γ.

According to the first feature of the present invention, when the nut member is rotated by the operation of the actuator, the ball housing also tries to rotate with the rotation of the screw shaft, but the first stopper surface provided on the inner periphery of the through hole of the ball housing Since the rotation of the ball housing is restricted by coming into contact with the outer peripheral surface of the connecting pin, the rotation of the screw shaft is restricted and the rotation of the screw shaft accompanying the rotation of the nut member is prevented. As a result, the pulley can be driven by accurately converting the rotational force of the motor into the thrust of the screw shaft. Furthermore, when the first stopper surface and the outer peripheral surface of the connecting pin come into contact, the reaction force acts in a direction perpendicular to the axis of the connecting pin, and the reaction force acts in the axial direction of the connecting pin. Therefore, it is possible to prevent the connecting pin from coming off from the ball bearing. In addition, since the connecting pin can swing within the range where it does not come into contact with the first stopper surface, it can absorb manufacturing errors of the actuator components and the mounting error of the actuator to the transmission case, etc. By absorbing the vibration of the arm, the generation of vibration noise can be prevented and the durability of the actuator can be improved. In addition, since the maximum swing angle of the connecting pin is regulated by contact with the first stopper surface, an increase in unnecessary side pressure force acting on the screw shaft from the connecting pin can be suppressed, and the screw shaft can be operated smoothly. Can be guaranteed.

According to the second feature of the present invention, the first stopper surface is inclined with respect to the axis of the ball housing and is in contact with the outer peripheral surface of the connecting pin in a line contact state. The surface pressure can be kept low, and the wear resistance of the contact portion can be increased.

According to the third feature of the present invention, the through hole is provided on the side facing the arm and is a tapered hole having a large diameter toward the outer side of the ball housing. In doing so, the through hole serves as a guide, and the connection pin can be easily fitted into the ball bearing.

According to the fourth feature of the present invention, the second stopper surface that restricts the swing angle of the ball bearing to a constant angle β by abutting with the ball bearing when the connecting pin is not inserted into the connecting hole. Provided in the ball housing, the angle β is set to an angle at which the connecting pin can be inserted into the connecting hole from the through hole. Therefore, it is inevitable that the ball bearing is not adjusted when the connecting pin is inserted into the connecting hole. Since the connection hole can receive the connection pin, the connection pin can be easily fitted into the connection hole. In particular, when the connecting pin has to be inserted in a state where the connecting hole cannot be seen, the operation can be significantly improved.

Further, according to the fifth feature of the present invention, since the angle α and the angle β are set as α <β, when the nut member is rotated by the operation of the actuator, before the first stopper surface comes into contact with the connecting pin. Since the ball bearing does not come into contact with the second stopper surface, it is not necessary to apply an unnecessary load to the ball bearing.

Further, according to the sixth aspect of the present invention, the detent that restricts the rotation angle around the axis of the screw shaft to the constant angle γ by abutting with the ball housing when the connecting pin is not inserted into the ball bearing is a unit. Since it is provided in the case, it is easy to fit the connecting pin into the ball bearing, and it prevents the screw shaft from rotating in the direction of rotation due to vibration during handling of the actuator, etc. The shaft can be prevented from falling off.

According to the seventh feature of the present invention, since the angle α and the angle γ are set as α <γ, when the nut member is rotated by the operation of the actuator, before the first stopper surface comes into contact with the connecting pin. Since the ball housing does not come into contact with the rotation stopper, it is not necessary to generate a frictional resistance that hinders the useless operation of the screw shaft due to the contact between the ball housing and the rotation stopper.

FIG. 1 is a plan sectional view of a belt type continuously variable transmission according to an embodiment of the present invention. (First embodiment) FIG. 2 is a side view of the belt-type continuously variable transmission according to the embodiment of the present invention (as viewed from arrow 2 in FIG. 1). (First embodiment) FIG. 3 is an enlarged view of a portion indicated by an arrow 3 in FIG. (First embodiment) 4 is a cross-sectional view taken along line 4-4 of FIG. (First embodiment) FIG. 5 is a cross-sectional view taken along the line 4-4 in FIG. 3 and shows a state before the connecting pin is inserted into the connecting hole. FIG. 5A shows the ball bearing in contact with the second stopper surface. FIG. 5B is a diagram illustrating a state in which the back surface of the ball housing is in contact with the rotation stopper. (First embodiment)

2 ... Input shaft 3 ... Output shaft 4 ... Drive pulley 5 ... Drive pulley 6 ... Belt 8 ... Actuator 9 ... Ball joint 13 ... · Arm 14 ··· Unit case 18 · · · Motor 19 · · · Screw shaft 19a · · · Male screw 21 · · · Nut member 25 · · · Ball housing 26 · · · Seat member 27 · · · Ball bearing 27a · · · Connecting hole 28 ... Connecting pin 28a ·· One end 28b · · Other end 28c · · Outer peripheral surface 30 ··· Through hole 32 ··· First stopper surface 34 ··· Second stopper surface 35 ··· Non-rotating X1... Axis of screw shaft X2... Axis of ball housing .alpha.... Rotation angle around axis of screw shaft regulated by first stopper surface .beta. γ ················· Rotation angle around the line

Embodiments in which the belt type continuously variable transmission of the present invention is applied to a vehicle such as a motorcycle will be described below with reference to the accompanying drawings.

First embodiment

FIG. 1 is a plan sectional view of a belt-type continuously variable transmission according to the present invention, and FIG. 2 is a view taken in the direction of arrow 2 in FIG.

As shown in FIGS. 1 and 2, a belt-type continuously variable transmission 1 includes an input shaft 2 to which power is transmitted from a power source such as an engine or a motor (not shown), and is not shown in parallel with the input shaft 2. An output shaft 3 for transmitting power to the wheels, a drive pulley 4 supported by the input shaft 2, a driven pulley 5 supported by the output shaft 3, a belt 6 wound around these

pulleys

4 and 5, A transmission case 7 that accommodates both

pulleys

4 and 5 and the belt 6 and an actuator 8 that is attached to the transmission case 7 and can change the groove width of the drive pulley 4 are mounted on a vehicle such as a motorcycle. . The actuator 8 may change the groove width of the driven pulley 5.

The drive pulley 4 includes a drive-side fixed sheave 4a fixed to the input shaft 2, and a drive-side movable sheave 4b supported by the input shaft 2 and movable in the axial direction of the input shaft 2. The driven side fixed sheave 5a is fixed to the output shaft 3 and the driven side movable sheave 5b is supported by the output shaft 3 and is movable in the axial direction of the output shaft 3.

The lamp plate 10 is fixed to the input shaft 2 behind the drive side movable sheave 4b, and a plurality of centrifugal weights 11 are held between the drive side movable sheave 4b and the lamp plate 10. When the input shaft 2 is now rotated and a centrifugal force corresponding to the rotational speed is applied to the centrifugal weight 11, the centrifugal weight 11 moves radially outward along the cam surface 4c of the drive side movable sheave 4b, and the drive side By moving the movable sheave 4b toward the drive side fixed sheave 4a, the winding radius of the belt 6 is increased.

An arm 13 is connected to the drive side movable sheave 4b via a bearing 12 so as to be relatively rotatable. The drive side movable sheave 4b is connected to the arm 13 via the arm 13 along the axis of the input shaft 2. An actuator 8 that is driven in the direction is connected via a ball joint 9.

Referring also to FIG. 3, which is an enlarged view of the portion 3 shown in FIG. 1, the actuator 8 is a unit case composed of a first case half 14a and a second case half 14b that form an outer shell thereof. 14, and a flat storage space 15 is defined between the first and second case halves 14a and 14b. The outer wall surface 14a 'of the first case half 14a opposite to the second case half 14b is a mounting surface to the mounting portion 7a formed in the mission case 7, and the transmission from the outer wall surface 14a' In the case 7, the first and second bulging

portions

16 and 17 of the first case half 14a bulge.

A motor 18 is disposed in the first bulging portion 16, and a screw shaft 19 is disposed in the second bulging portion 17. The mounting portion 7 a of the transmission case 7 has first and second portions. An opening 7 b for inserting the bulging

portions

16 and 17 into the mission case 7 is formed. Further, a reduction gear mechanism 20 that reduces the output of the motor 18 and a nut member 21 that is rotationally driven by the motor 18 via the reduction gear mechanism 20 are disposed in the storage space 15.

The nut member 21 is rotatably supported by the first and second case halves 14 a and 14 b via

bearings

22 and 23, and a female screw 21 a formed on the inner periphery of the nut member 21 is attached to the screw shaft 19. A feed screw mechanism that converts the rotational movement of the nut member 21 into the linear movement of the screw shaft 19 is configured by screwing with the formed male screw 19a. The screw shaft 19 is slidably disposed in the second bulging portion 17 so that the tip end portion 19 b protrudes outward from the second bulging portion 17, and the nut member 21 rotates the motor 18. By rotating under the force, the screw shaft 19 with the tip 19 b protruding from the second bulging portion 17 moves forward and backward along the axis of the nut member 21. The male screw 19a may be formed integrally with the screw shaft 19, or may be formed separately and integrated with the screw shaft 19.

Referring also to FIG. 4 as viewed in the direction of arrows 4-4 in FIG. 3, a cylindrical ball housing 25 having an axis X2 orthogonal to the axis X1 of the screw shaft 19 is provided at the tip 19b of the screw shaft 19. A cylindrical seat member 26 having an axis common to the axis X2 of the ball housing 25 and a ball bearing 27 supported by the seat member 26 so as to be swingable are accommodated in the ball housing 25. The ball bearing 27 is formed with a connection hole 27 a for fitting a connection pin 28 extending from the arm 13.

One end 28 a of the connecting pin 28 is fitted into the fitting hole 13 a at the tip of the arm 13 and fixed to the arm 13, and the other end 28 b protruded from the tip of the arm 13 is connected to the connecting hole of the ball bearing 27. The ball joint 9 is configured by being fitted to the arm 27 a so that it can be inserted and removed and the ball housing 25 is assembled to the arm 13. The connecting pin 28 may be formed integrally with the arm 13.

A wall 29 extending from the peripheral edge of the ball housing 25 toward the center is formed on the facing surface 25 a of the ball housing 25 facing the arm 13, and is connected to the center of the wall 29. A through hole 30 for penetrating the pin 28 is formed so as to have an axis common to the axis X2 of the ball housing 25. The back surface 25b of the ball housing 25 (the surface opposite to the facing surface 25a) is an open surface, and a lid 31 is provided to hold the seat member 26 and avoid the inflow of dust. If there is no cover 31, the lid 31 may be omitted.

The rotation angle around the axis X1 of the screw shaft 19 (the axis X2 of the ball housing 25 with respect to the axis X3 of the connection pin 28 is brought into contact with the outer peripheral surface 28c of the connection pin 28 on the inner periphery of the through hole 30 of the ball housing 25. The first stopper surface 32 that restricts the rotation angle) to a constant angle α is provided, and the first stopper surface 32 can keep the surface pressure of the contact portion with the outer peripheral surface 28c of the connecting pin 28 low. The inclined surface is inclined by an angle α with respect to the axis X2 and comes into contact with the outer peripheral surface 28c of the connecting pin 28 in a line contact state. Moreover, the through hole 30 is formed into a tapered hole having a large diameter toward the outer side of the ball housing 25, so that when the connecting pin 28 is fitted into the ball bearing 27, the through hole 30 is a guide. Thus, it is possible to easily insert the connecting pin 28 into the ball bearing 27.

In order to attach the actuator 8 to the transmission case 7, the first and second bulging

portions

16 and 17 of the first case half 14a of the actuator 8 are inserted into the transmission case 7 through the opening 7b of the transmission case 7, and the ball After the other end 28b of the connecting pin 28 extending from the tip of the arm 13 is fitted into the connecting hole 27a of the bearing 27, the opening 7b of the transmission case 7 is covered with the outer wall surface 14a 'of the first case half 14a. Then, the unit case 14 of the actuator 8 is fixed to the transmission case 7. At this time, in a state before the other end portion 28 b of the connection pin 28 is fitted into the connection hole 27 a of the ball bearing 27, the ball bearing 27 is Since it can swing freely with respect to the housing 25, the direction of the axis X 4 of the connecting hole 27 a of the ball bearing 27 is the direction of the through hole 30. Since the ball housing 25 is in a state of being largely deviated from the direction of the line X2 and the ball housing 25 can be freely rotated around the axis X1 of the screw shaft 19, the screw shaft 19 moves loosely due to vibration or the like and falls off the nut member 21. There is a risk that a situation will occur.

Thus, in this embodiment, as shown in FIG. 5A showing a state before the connection pin 28 is inserted into the connection hole 27a, the ball is not inserted in the connection hole 27a. A wall of the ball housing 25 has a second stopper surface 34 that abuts the side surface 27b of the bearing 27 on the wall 29 side so as to restrict the swing angle of the axis X4 of the connecting hole 27a with respect to the axis X2 of the through hole 30 to a constant angle β. Since the angle β is set to an angle at which the connecting pin 28 can be inserted from the through hole 30 into the connecting hole 27a, the ball β is inserted into the connecting hole 27a. Even if the posture of the bearing 27 is not adjusted, the connection hole 27a is inevitably received by the connection pin 28, and the connection pin 28 can be easily fitted into the connection hole 27a.

In addition, the angle β is set to α <β, and when the nut member 21 is rotated by the operation of the actuator 8, the side surface 27b of the ball bearing 27 is second before the first stopper surface 32 comes into contact with the connecting pin 28. Since it does not abut against the stopper surface 34, it is not necessary to apply an unnecessary load to the ball bearing 27.

Further, at the tip of the second bulging portion 17 of the first case half 14a, as shown in FIG. 5B, the back surface of the ball housing 25 when the connecting pin 28 is not inserted into the connecting hole 27a. The rotation angle around the axis line X1 of the screw shaft 19 (the rotation angle of the axis line X2 of the ball housing 25 with respect to the axis line X3 of the connection pin 28 when the connection pin 28 is fitted in the connection hole 27a) by contacting with 25b. Since the rotation stopper 35 that restricts to γ is projected, the connection pin 28 can be easily fitted into the connection hole 27a, and the rotation direction of the screw shaft 19 due to vibration or the like during handling such as when the actuator 8 is transported. The screw shaft 19 can be prevented from falling off from the nut member 21 due to the loose movement.

In addition, the angle γ is set such that α <γ. When the nut member 21 is rotated by the operation of the actuator 8, the ball housing 25 contacts the detent 35 before the first stopper surface 32 contacts the connecting pin 28. Since they are not in contact with each other, it is not necessary to generate a frictional resistance that hinders the unnecessary operation of the screw shaft 19 due to the contact between the ball housing 25 and the rotation stopper 35.

The second stopper surface 34 may be provided on the back surface 25b side of the ball housing 25 so that the side surface 27c opposite to the side surface 27b of the ball bearing 27 is brought into contact with the second stopper surface 34. .

Further, in order to ensure that the connecting hole 27a of the ball bearing 27 can receive the connecting pin 28 during handling such as when the actuator 8 is transported, the angles α, β, and γ are α <β <. It is desirable to set to γ.

Next, the operation of this embodiment will be described.

When the nut member 21 is rotated by the operation of the actuator 8, the ball housing 25 also tries to rotate with the rotation of the screw shaft 19, but the first stopper surface 32 provided on the inner periphery of the through hole 30 of the ball housing 25 is close to it. Since the rotation of the ball housing 25 is restricted by contacting the outer peripheral surface 28c of the connecting pin 28, the rotation of the screw shaft 19 is restricted, and the rotation of the screw shaft 19 accompanying the rotation of the nut member 21 is prevented. The As a result, the rotational force of the motor 18 can be accurately converted into the thrust of the screw shaft 19 to drive the drive side movable sheave 4b of the drive pulley 4. Furthermore, when the first stopper surface 32 and the outer peripheral surface 28c of the connecting pin 28 come into contact with each other, the reaction force acts in a direction perpendicular to the axis X3 of the connecting pin 28, and the reaction force is applied to the connecting pin 28. Therefore, the connecting pin 28 can be prevented from coming off from the ball bearing 27. In addition, since the connecting pin 28 can swing within a range where it does not contact the first stopper surface 32, it is possible to absorb manufacturing errors of components of the actuator 8, mounting errors of the actuator 8 to the transmission case 7, and the like. The vibration of the arm 13 caused by the vibration of the pulley 4 and the like can be absorbed to prevent generation of vibration noise and improve the durability of the actuator 8. Further, since the maximum swing angle of the connecting pin 28 is restricted to the angle α by the contact with the first stopper surface 32, an increase in unnecessary lateral pressure component acting on the screw shaft 19 from the connecting pin 28 is suppressed, Smooth operation of the screw shaft 19 can be ensured.

Further, since the first stopper surface 32 is inclined with respect to the axis X2 of the ball housing 25 and is in contact with the outer peripheral surface 28c of the connecting pin 28 in a line contact state, the surface pressure of the contact portion is kept low. The wear resistance of the contact portion can be improved.

Further, since the through hole 30 is provided on the side facing the arm 13 and is a tapered hole having a large diameter toward the outer side of the ball housing 25, when the connecting pin 28 is fitted into the ball bearing 27, the through hole is provided. The guide pin 30 can be easily fitted into the ball bearing 27.

Further, when the connecting pin 28 is not fitted into the connecting hole 27 a, the second stopper surface 34 that restricts the swing angle of the ball bearing 27 to a constant angle β by contacting the ball bearing 27 is provided on the wall of the ball housing 25. Since the angle β is provided on the back surface side of the portion 29 and is set to an angle at which the connecting pin 28 can be inserted into the connecting hole 27a from the through hole 30, the posture of the ball bearing 27 when the connecting pin 28 is inserted into the connecting hole 27a. Even if it is not adjusted, the connecting hole 27a is inevitably in a state where it can receive the connecting pin 28, and the connecting pin 28 can be easily fitted into the connecting hole 27a. In particular, when the connecting pin 28 must be fitted in a state where the connecting hole 27a cannot be seen, the operation can be significantly improved.

Since the angle α and the angle β are set as α <β, when the nut member 21 is rotated by the operation of the actuator 8, the ball bearing 27 is moved to the second position before the first stopper surface 32 contacts the connecting pin 28. Since there is no contact with the stopper surface 34, it is not necessary to apply an unnecessary load to the ball bearing 27.

Further, when the connecting pin 28 is not fitted to the ball bearing 27, the rotation stopper 35 that restricts the rotation angle around the axis X1 of the screw shaft 19 to a constant angle γ by contacting the back surface 25b of the ball housing 25 is a unit. Since the projection is provided at the tip of the second bulging portion 17 of the case 14, it is easy to fit the connecting pin 28 into the ball bearing 27, and the screw shaft 19 due to vibration or the like is handled during handling of the actuator 8 during transportation. It is possible to prevent the loose movement in the rotational direction, and to prevent the screw shaft 19 from dropping from the nut member 21 due to the loose movement.

Furthermore, since the angle α and the angle γ are set as α <γ, when the nut member 21 is rotated by the operation of the actuator 8, the ball housing 25 rotates before the first stopper surface 32 contacts the connecting pin 28. Since it does not come into contact with the stop 35, it is not necessary to generate a frictional resistance that hinders the useless operation of the screw shaft 19 due to the contact between the ball housing 25 and the rotation stop 35.

As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, A various design change is possible without deviating from the summary.

For example, the belt-type continuously variable transmission of the present invention is not limited to that mounted on a motorcycle, and can be used in any type of vehicle.

Claims

A drive pulley (4) supported by the input shaft (2), a driven pulley (5) supported by the output shaft (3), and a belt (6) wound around these pulleys (4, 5); An actuator (8) that can drive any one of the pulleys (4, 5) to change the groove width of the pulley, and the driving force of the actuator (8) The actuator (8) includes a nut member (21) that rotates by receiving the rotational force of the motor (18), and a male screw (19a) that is screwed into the nut member (21). ) To convert the rotational motion of the nut member (21) into a linear motion and drive one of the pulleys, and the arm (13) and the screw shaft (19). Connected via ball joint (9) A the belt-type continuously variable transmission,
The ball joint (9) is pivoted by a ball housing (25) provided on the screw shaft (19), a seat member (26) accommodated in the ball housing (25), and the seat member (26). A ball bearing (27) that can be held; and a connecting pin (28) that extends from the arm (13) and is fitted into the ball bearing (27), and is formed through the connecting pin (28). A hole (30) is provided in the ball housing (25), and the screw shaft (19) is brought into contact with the outer peripheral surface (28c) of the connecting pin (28) on the inner periphery of the through hole (30). A belt type continuously variable transmission is provided with a first stopper surface (32) for restricting the rotation angle around the axis (X1) of the shaft to a constant angle α.
The first stopper surface (32) is an inclined surface that is inclined with respect to the axis (X2) of the ball housing (25) and contacts the outer peripheral surface (28c) of the connecting pin (28) in a line contact state. The belt-type continuously variable transmission according to claim 1.
The said through-hole (30) is provided in the side facing the said arm (13), It was made into the taper hole which becomes a large diameter toward the outer side of the said ball housing (25), or characterized by the above-mentioned. The belt-type continuously variable transmission according to claim 2.
One end (28a) of the connecting pin (28) is fixed to the arm (13) and the other end (28b) of the connecting pin (28) is provided to the ball bearing (27). ) In such a manner that the connecting pin (28) is not inserted into the connecting hole (27a), and the ball bearing (27) is brought into contact with the ball bearing (27) to thereby change the swing angle of the ball bearing (27). The ball housing (25) is provided with a second stopper surface (34) for restricting to a constant angle β, and the angle β is inserted from the through hole (30) to the connecting pin (28) into the connecting hole (27a). The belt-type continuously variable transmission according to any one of claims 1 to 3, wherein the angle is set to a possible angle.
The belt-type continuously variable transmission according to claim 4, wherein the angle α and the angle β are set as α <β.
When the connecting pin (28) is not inserted into the ball bearing (27), the rotation angle around the axis (X1) of the screw shaft (19) is set to a constant angle γ by contacting the ball housing (25). The belt-type continuously variable belt according to any one of claims 1 to 5, wherein a detent (35) that restricts the rotation is provided in a unit case (14) that forms an outer shell of the actuator (8). transmission.
The belt type continuously variable transmission according to claim 6, wherein the angle α and the angle γ are set as α <γ.