JPH01283462A - Belt type continuously variable automatic transmission for vehicle - Google Patents

Abstract

PURPOSE:To enable easy overhaul for repairs by supporting the shaft of a variable pulley with a through-hole part formed on a wall separating the variable pulley from a reverse and forward selector device. CONSTITUTION:A through-hole 117 is formed on a wall 111 separating variable pulleys 31 and 41 from a reverse and forward selector device 110 and the shaft of the variable pulley 31 is supported with the part of the through-hole 117. Furthermore, the shaft 8 of the variable pulley 31 is splined to the reverse and forward selector device 110 via the through hole 117. If any one of the variable pulley 31 and the reverse and forward selector device 110 is out of order and the repairs and change thereof is required, the pulley 31 and the device 110 can be easily separated from each other simply by disconnecting the spline.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention provides an endless belt having a figure-7 or trapezoid cross section that is stretched between variable pulleys on two axes. A belt-type stepless automatic transmission that continuously changes the rotational speed ratio between the shafts of two variable pulleys by changing the position, especially a belt-type automatic transmission that is applied to a vehicle automatic transmission. The present invention relates to a gear automatic transmission.

(Prior art) Conventionally, belt-type continuously variable transmissions require a gear mechanism for reversing in order to be used in vehicles, and there is a limit to the diameter of the variable pulley, making it difficult to set a large reduction ratio. Therefore, it is necessary to make the reduction ratio between the output shaft and the wheel drive shaft larger than that of a gear type transmission, but since the structure is cylindrical and smaller than a gear type transmission, It is suitable for integrating the device and the differential.

This conventional belt-type continuously variable automatic transmission for vehicles has a structure in which an endless belt connects a primary pulley supported on the input shaft side and a secondary pulley supported on the output side. The primary pulley and secondary pulley each include a fixed flange and a movable flange that moves relative to the fixed flange.

Further, a forward/reverse switching device is formed by a multi-plate flanch, a planetary gear device, and a multi-plate brake, and the forward/backward switching device is arranged on the input shaft side or output shaft side of the variable pulley consisting of the primary pulley and secondary pulley. It is designed to switch the vehicle forward or backward.

By the way, 1. The forward/backward switching device and the variable pulley are:
They are placed across the wall, and the two are integrally connected.

(Problem to be Solved by the Invention) However, in the conventional belt-type continuously variable automatic transmission for vehicles, the forward/reverse switching device and the variable pulley are disposed with a wall interposed between them, and moreover, they are integrated. Since the variable pulley and the forward/reverse switching device need to be repaired or replaced, they must be completely disassembled and removed. therefore,
Maintenance and management became difficult and the costs were high.

The present invention eliminates the problems of the conventional belt-type continuously variable automatic transmission for vehicles, and when repairing or replacing only one of the variable pulley and the forward/reverse switching device, it is possible to disassemble both.・The purpose is to provide a belt-type continuously variable automatic transmission for vehicles that does not require any transmission.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides an endless belt (51) having a V-shaped or trapezoidal cross section between two variable pulleys (31) and (41). , the endless belt (51)
By changing the radial position of contact with each variable pulley (31L (41)), the rotational speed ratio between the axes of the two variable pulleys (31) and (41) is changed steplessly, and , a belt-type continuously variable automatic transmission for a vehicle equipped with a forward/reverse switching device!! (110) that engages a multi-disc clutch (11) or a multi-disc brake (19) to switch between forward and reverse motion of the vehicle!! Variable pulley (
31) A through hole (117) is formed in the wall (111) separating (41) and the forward/reverse switching device (110), and the shaft (8) of the variable pulley (31) is formed in the through hole (117) portion.
I would like to support this.

The shaft (8) of the variable pulley (31) and the forward/reverse switching device (110) are spline connected via the through hole (117).

(Action and Effect of the Invention) According to the present invention, the variable pulley (31) as described above
, An M1 hole (117) is formed in the wall (111) separating the forward/reverse switching device (110) from the (41), and the shaft (8) of the variable pulley (31) is supported in the through hole (117). At the same time, since the shaft (8) of the variable pulley (31) and the forward/reverse switching device (110) are spline-connected via the through hole (117), the variable pulley (
31) and the forward/reverse switching device (110) if it becomes necessary to repair or replace them, the two can be easily separated by simply removing the spline connection. , maintenance and management costs can be reduced.

In the above description, each element is given a reference numeral for convenience of explanation, but these do not limit the configuration of the present invention.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

Fig. 1 is a schematic diagram of a belt-type continuously variable automatic transmission for a vehicle, Fig. 2 is a schematic diagram showing the rotational connection state between the primary pulley, secondary pulley, and differential gear housing, and Fig. 3 is a schematic diagram of the belt-type continuously variable automatic transmission of the present invention. FIG. 1 is a sectional view of a belt-type continuously variable automatic transmission for a vehicle.

In the figure, a torque converter 1 includes a pump impeller 2 connected to the output shaft of a prime mover A such as an internal combustion engine, a turbine runner 3 connected to an input shaft 7 (described later), and a stator 4 supported in a housing 100 by a one-way clutch. configured. Further, the piston 5 is slidable relative to the turbine runner 3 or the input shaft 7, or the piston 5 is slidable relative to the turbine runner 3 or the input shaft 7, or
The turbine runner 3 is fixed to the turbine runner 3, which is slidable.

A friction plate 6 provided on the piston 5 faces the casing of the torque converter 1 fixed to the pump impeller 2, and the casing and the piston 5 constitute a direct clutch.

The input shaft 7 of the transmission is rotatably supported by a housing 100, one end of which is connected to the turbine runner 3, and the other end rotatably supports an intermediate shaft 8 arranged on the same axis. There is. One end of the intermediate shaft 8 is supported by the input shaft 7 as described above, and the other end is supported by the housing 10.
It is supported by 0.

A clutch drum 9 is fixed concentrically to the end of the input shaft 7, while a clutch drum 9 is fixed to the end of the intermediate shaft 8 on the manual side.
The hubs 10 are concentrically connected by spline engagement. A multi-disc clutch 11 is disposed between the cylindrical members of the clutch drum 9 and the clutch knob 10,
A multi-disc clutch 11 is actuated by a piston 12 slidably provided on the cradle 1.9 to engage and disengage the input shaft 7 and the intermediate shaft 8. Note that 13 is the piston 12
This is the cylinder that operates the .

Incidentally, the intermediate shaft 8 includes a sun gear 14 spline-engaged with the shaft 8, a ring gear 15 rotatable concentrically with the shaft 8, a planetary pinion 16 meshing with the sun gear 14, and a ring gear 15. A planetary gear device 18 is provided, consisting of a planetary pinion 16' mating with the planetary pinion 16, and a planetary carrier 17 rotatably supporting the planetary pinion 16 and 16' in a mutually meshed state. There is.

The outer periphery of the planetary carrier 17 of the planetary gear device 18 is splined to the clutch drum 9, and the outer periphery of the ring gear 15 and the housing 100 form a cylinder 20.

A piston 21 is slidably housed in the cylinder 20, and the multi-disc brake 19 is actuated to engage and disengage the ring gear 15 from the housing 100.

In the above configuration, when the multi-disc clutch 11 is engaged, the rotation of the input shaft 7 is transmitted to the intermediate shaft 8 and the vehicle moves forward. On the other hand, when the multi-disc clutch 11 is released and the multi-disc brake 19 is engaged, the ring gear 15
is locked to the housing 100, and the rotation of the human power shaft 7 is reversed and transmitted to the intermediate shaft 8.

In this way, the forward/reverse device is connected between the input shaft 7 and the intermediate shaft 8 by the multi-disc clutch 11, the planetary gear 18, and the multi-disc brake 19 arranged from the input shaft 7 side to the intermediate shaft 8 side. In other words, a forward/reverse switching device 110 is configured.

In the forward/reverse switching device 110, the rotation of the input shaft 7 is directly transmitted to the output shaft 8 simply by engaging the multi-plate clutch 11 during forward movement, and meshing between the gears of the planetary gear device 18 is not required. Therefore, it is possible not only to reduce noise caused by meshing but also to improve the durability of the planetary gear device 18.

The forward/reverse switching device 110 also includes a planetary pinion 16 between the sun gear 14 and the ring gear 15 as described above.
．． 16' is used, so the output does not change between forward movement and reverse movement.

Further, the multi-disc brake 19 is disposed radially outward of the planetary gear device 18, and the rotating side thin plate of the multi-disc brake 19 is fixed to the outer periphery of the ring gear 15 of the planetary gear device 18. Therefore, the forward/reverse switching device 110 can be made compact.

Next, a primary boolean IJ31 is disposed on the intermediate shaft 8 adjacent to the forward/reverse switching device, and forms a variable pulley together with a secondary pulley 41, which will be described later. The primary pulley 31 includes a fixed flange 32 concentrically integrated with the intermediate shaft 8, and a movable flange 33 concentrically arranged with respect to the intermediate shaft 8 and sliding in the axial direction. It consists of

A cylindrical portion 35 is integrally formed on the movable flange 33 and is arranged concentrically with a disk 37 of a cylinder 36 fixed to the intermediate shaft 8 . A first piston 38 whose inner periphery is fixed to the intermediate shaft 8 and whose outer periphery is fitted to the inner periphery of the cylindrical disk 35 is fitted between the first piston 38 and the peripheral wall 37 of the cylinder 36. A double piston type fluid pressure servo 40 is constituted by the combined second piston 39.

Here, a wall 111 is provided between the forward/reverse switching device +10 and the primary pulley 31 to separate them.
The intermediate shaft 8 passes through a through hole 117 provided at the center of the wall 111. A recess 112 is formed in the wall 111 and opens in the same manner as the forward/reverse switching device 110, and at least a part of the elements constituting the forward/reverse switching device 110, such as the piston 21, is disposed in the recess 112. is accommodated.

Further, a hair ring 113 is disposed on the wall 111 on the axial center side of the through hole 117.

Therefore, the forward/reverse switching device 1 accommodated in the recess 112
Since at least a portion of the hair ring 10 is disposed at a position overlapping the hair ring 113 in one sleeve direction, the axial dimension of the device can be reduced by the overlapping length.

By the way, the primary boo 1, 131 has a bearing 113 at one end and a hair ring 114 at the other end.
is directly supported by the housing 100. Moreover, each hair ring 113, 114 has a fixed flange 31.
and is arranged close to the movable flange 33.

On the other hand, an output shaft 25 is provided parallel to the intermediate shaft 8 in order to take out the output after changing the rotational speed ratio via the variable pulley. The output shaft 25 is directly supported on the housing 100 by hair rings 115 and 116, similar to the intermediate shaft 8, and bearings 115 and 116 are connected to the fixed flange 42 and the movable flange 4.
It is placed close to 3.

In this way, both the intermediate shaft 8 and the output shaft 25 are firmly supported by the housing 100, so that the rigidity against the stress applied to both shafts 8 and 25 due to the tension of the endless heel 51, which will be described later, is increased. Can keep both shafts 8, 2 at all times
5 can be kept parallel.

The output shaft 25 also includes the primary pulley 3.
Secondary pulley 41 which together with 1 constitutes a variable pulley
A fixed flange 42 is formed integrally with the output shaft 2.
A movable flange 43 disposed concentrically with respect to the output shaft 5 can slide on the output shaft 25 in the axial direction.

In addition, a cylindrical disk 5 integrally formed with the movable flange 43 is provided.
are arranged concentrically with the circumference 47 of the cylinder 4G fixed to the output shaft 25. Then, a first shaft whose inner circumference is fixed to the output shaft 25 and whose outer circumference is fitted to the inner circumference of the cylindrical disk 45 is provided.
a second piston 4 fitted between the first piston 48 and the circumferential member 47 of the cylinder 46;
9 constitute a double piston type fluid pressure servo 50.

A helical spring 4I is provided within the cylinder 4G, and provides an elastic force that constantly presses the movable flange 43 toward the fixed flange 12.

Reference numeral 51 denotes an endless belt that is stretched between opposing conical inclined surfaces of the respective flanges of the primary pulley 31 and the secondary pulley 41. The endless belt 51 is
A metal block 5 formed with slits 53 and 53 opening in the inclined surfaces 52 and 52 that engage with the conical inclined surface.
4 are lined up in the thickness direction and connected in series with endless metal hands inserted into the slits 53 and 53 (see, for example, Japanese Patent Application Laid-Open No. 54-52253). 1J31. The secondary pulley 41 and the endless belt 51 constitute a belt type continuously variable transmission.

By the way, a differential gear housing 28 houses a differential gear device including a wheel drive shaft 27.27' for transmitting power to the left and right wheels, and a bevel gear fixed to the wheel drive shaft 27.27'.
However, the wheel drive shafts 27 and 27' are rotatably supported by the housing 100 so as to be parallel to the output shaft 25. A sprocket wheel 26 is provided on the output shaft 25, and a chain 61 is stretched between the sprocket wheel 29 provided on the outer periphery of the differential gear housing 28 and the sprocket wheel 26. The rotation of the shaft 25 is transmitted to the wheel drive shaft 27.27'.

The sprocket wheel 26 of the output shaft 25 has an output I
Although it may be fixed directly to the FllI 25, in the illustrated embodiment it is configured to rotate concentrically with the output shaft 25.

That is, a reduction gear is provided by a sun gear 55 fixed to the output shaft 25, a ring gear 57 meshing with the sun gear 55 and fixed to the housing 100 at a position concentric with the sun gear 55, and a planetary carrier 58 rotatably supporting a planetary binion 56. A device 118 is configured. The planetary carrier 58 is connected to the sprocket wheel 26 to decelerate the rotation of the output shaft 25 and transmit it to the sprocket wheel 26.

On the other hand, in order to lock the power transmission system when parking the vehicle, the fixed flange of the secondary boot, 1
An engaging pawl 120 for parking is provided on the outer peripheral edge of 2. Since the engaging pawl 120 is disposed in front of the reduction gear device 118 in the power transmission system, it is possible to freeze the torque reversely transmitted from the tire to the engaging pawl 120. Further, the jffM speed gear device 118 is disposed rearward of the forward/reverse switching device 110 in the power transmission system. Therefore, even though the engaging pawl 120 is locked, there is no longer a problem that perfect parking cannot be performed due to gear shift in the forward/reverse switching device 110 due to torque from the tires.

Incidentally, grooves in the axial direction are formed on the outer wall of the intermediate shaft 8 and the inner wall of the shaft of the movable flange 33 of the primary pulley 31 so as to face each other, and a plurality of FOP bodies 62.
62... is held in place. Additionally, grooves in the axial direction are similarly formed on the outer wall of the output shaft 25 and on the inner wall of the shaft of the movable flange 43 of the secondary boot IJ41, and a plurality of spheres 63, 63, . . . are formed in the grooves.・is pinched. Due to the engagement of these grooves and the spheres 62.63, the movable flange 33.43 is rotated integrally with the shaft 8.25 and is supported by the spheres 62.63, reducing the sliding resistance in the axial direction. It will be done.

Further, a governor valve 101 is provided at one end of the output shaft 25, and is adjusted so that a factor proportional to the running speed of the output shaft 25, that is, the wheels, is added to the fluid pressure generated by the oil pump 102.

In the vehicle belt-type continuously variable automatic transmission configured as described above, when the manual pulp (not shown) is operated to the forward position, the line pressure adjusted by the throttle valve (not shown) and the governor pulp 101 is increased. is introduced into the cylinder 13, the multi-disc clutch 11 is engaged, and the human power shaft 7 and the intermediate shaft 8 are coupled.

At this time, the line pressure is applied to the shaft hole 103 of the intermediate shaft 8.
, the line pressure is introduced into the cylinder chamber of the fluid pressure servo 40 through the oil hole 104 and the oil hole 105 drilled in the shaft cylinder portion of the movable flange 33, while the line pressure is introduced into the shaft hole 106 of the output shaft 25, the oil hole 107, and When introduced into the cylinder chamber of the fluid pressure servo 50 through the oil hole 108 drilled in the shaft cylinder portion of the movable flange 43, the movable flanges p33, 43 of the primary pulley 31 and the secondary pulley 41 are connected to the fixed flange 33. 43 is pressed toward the fixed flange 32.42, its conical inclined surface pinches the inclined surface 52 of the endless belt 51, and the rotation of the intermediate shaft 8 is transmitted to the output shaft 25 via the endless belt 51. Ru.

When the pressure of the working fluid acting on the fluid pressure servo 40 of the primary pulley 31 is to be made higher than the pressure of the working fluid acting on the fluid pressure servo 50 of the secondary boo 1J41, the primary pulley 31 is engaged. As the effective driving radius of the endless belt 51 gradually increases, the effective driving radius of the endless belt 51 that engages with the secondary pulley 41 gradually decreases, and the belt type transmission can steplessly increase the speed of the output shaft 25. become.

The rotation of the output shaft 25 is transmitted to the sprocket wheel 26 at a predetermined reduction ratio by a reduction gear device composed of a sun gear 55, a planetary pinion 56, a planetary carrier 58, and a ring gear 57.
, the sprocket wheel 29, and the differential gear housing 28 to the left and right wheel drive shafts 27, 27'.

Here, when the manual valve is operated to the reverse position, line pressure is sent to the cylinder 20 and the piston 21
activates the multi-plate brake 19. As a result, the ring gear 15 is locked to the housing 100, and the intermediate shaft 8 is
It is reversely rotated with respect to the human power shaft 7 via the planetary gear device 18 at a predetermined reduction ratio.

and the primary pulley 31 and the secondary pulley 1 fluid pressure servo 40. , 50 are subjected to the same line pressure as described above, and the wheel drive shafts 27, 27' are rotationally driven in the reverse direction.

Next, when the manual pulp is operated to the neutral position, the line pressure of the cylinder 13.20 and the fluid pressure servo 40 is drained, so the elastic force of the helical spring 44 in the fluid pressure servo 50 of the secondary boot is , presses the movable flange 43 close to the fixed flange 41. At this time, the locking position of the endless bell (51) that engages with the secondary pulley 41 is pushed out in the radial direction, so that the output shaft 25 with respect to the intermediate shaft 8 while the vehicle is stopped is
has the largest deceleration rate. .

In the vehicle belt-type continuously variable automatic transmission having the above configuration, as shown in FIG.
7.27' are made parallel, and the drive is transmitted between both wheels by the chain 61, so compared to the case where the drive is transmitted by gears, the deceleration rate between the output shaft 25 and the wheel drive shaft 27, 27' can be set arbitrarily. You can choose.

Further, the power transmission path can be made short and lightweight, and the working fluid can be supplied to the fluid pressure servo 50 of the output shaft 25 from the end of the output shaft 25. , the degree of freedom in arranging the wheel drive shaft 27 is increased.

Note that the present invention is not limited to the above embodiments,
Various modifications are possible based on the spirit of the present invention, and these are not excluded from the scope of the present invention.

For example, in the present invention, any fluid coupling can be used as the fluid coupling, such as the Bakafurukan coupling of the illustrated torque converter.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a heald 2 continuously variable automatic transmission system for a vehicle according to the present invention, Fig. 2 is a schematic diagram of a power transmission system, and Fig. 3 is a cross section of a belt type continuously variable automatic transmission system for a vehicle according to the present invention. It is a diagram. A... Prime mover, 1... Torque converter, 7...
Input shaft, 8... intermediate shaft, 11... multi-plate clutch,
14... Sun gear, 15... Ring gear, 16.1
6'...Planetary pinion, 17...Planetary carrier, 18...Planetary gear device, 19...
・Multi-plate brake, 25...output shaft, 26, 29...
・Sprocket wheel, 27.27'...Wheel drive shaft, 28...Differential gear housing, 31...Primary pulley, 32.42...Fixed flange, 33.43...
・Movable flange, 40.50...Fluid pressure servo, 41
...Secondary pulley, 44...Spring, 51
...Endless belt, 61...Chain, 110...
Forward/forward switching device, 111...Wall, 113-116...
・Bearing, 117...Through hole.

Claims (1)

[Claims] An endless belt with a V-shaped or trapezoidal cross section is stretched between two variable pulleys, and the rotational speed between the axes of the two variable pulleys is controlled by changing the radial position where the endless belt contacts each variable pulley. In a belt-type continuously variable automatic transmission for a vehicle, which is equipped with a forward/reverse switching device that continuously changes the ratio and engages a multi-disc clutch or multi-disc brake to switch between forward and reverse motion of the vehicle, the above-mentioned variable A through hole is formed in the wall separating the pulley and the forward/reverse switching device, and the shaft of the variable pulley is supported in the through hole portion, and
A belt-type continuously variable automatic transmission for a vehicle, characterized in that the shaft of the variable pulley and a forward/reverse switching device are spline-connected via the through hole.