JPH03181657A - Continuously variable transmission - Google Patents

Abstract

PURPOSE:To make the steady detection of rotating speed possible even at the time of the high speed revolution of an engine and to reduce the deformation and misalignment of detecting elements for improving the sensitivity of a detector by providing a concave-convex groove for generating a magnetic field on an outer periphery of a dog clutch sleeve, and attaching a rotation detector for detecting the magnetic field to a fork. CONSTITUTION:A detecting groove 41a is provided on an outer periphery of a dog clutch sleeve 41, and an electromagnetic pickup 45 is provided near the groove 41a on a fork 43. The number of revolution of the sleeve 41 is measured through the pickup 45 for measuring the number of revolution of an input shaft 6. Since the outside diameter D41 of the sleeve 41 is therefore extremely small from the past, the rotating speed of the sleeve 41 is slow, and the pickup 45 can therefore steadily detect the number of revolution of the sleeve 41 even at the time of high speed revolution of an input shaft 6. In addition to that, the pickup 45 can be provided on the usual fork 43 to simplify the structure of a gear shifter without providing a special structural member for a reduction in manufacturing cost. Since the detecting groove 41a hardly has the possibility of deformation and misalignment, the pickup 41 can sufficiently approach the detecting groove 41a to sharply improve the sensitivity of a rotation detector.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a continuously variable transmission, specifically a continuously variable transmission having an input shaft rotation detection mechanism for detecting the rotation speed of an input shaft of the continuously variable transmission. Regarding.

(Prior Art) An example of a conventional input shaft rotation detection mechanism for a continuously variable transmission is the one shown in FIG.

In Fig. 3, 1 is a V-belt continuously variable transmission (hereinafter referred to as
In the continuously variable transmission, the rotation of the input shaft is changed on the forward side through a V-belt type continuously variable transmission mechanism used for the 1st speed gear and 2nd speed and above, and on the reverse side, the rotation is changed through the reverse speed. The speed is changed through gears.

The continuously variable transmission 1 has an input shaft 6 that is pivotally supported by a case 2 and protrudes from the center of the case 2. One end of the input shaft 6 is spline-fitted to a turbine launch of a torque converter 3 and connected to a drive source. However, the other end is integrally connected to the input pulley shaft 5 of the continuously variable transmission mechanism 4 by spline engagement.

During first speed running, the rotation of the input shaft 6 is controlled by a forward/reverse clutch (hereinafter simply referred to as a D/R clutch) 9 and a D/R clutch that are spline-engaged with the input shaft 6 at the axial center of the input shaft 6.
It is transmitted to the first speed gear 12 via the dong crunch mechanism 11 connected to the R clutch 9, and further transmitted to the differential gear 16 via the one-way clutch 14 and output shaft 15.
The one-way clutch 14 is rotatably supported on the output shaft 15 and has a clutch gear 14A that meshes with the l-speed gear 12.
The intermediate gear 14B rotates integrally with the driven gear 20B of the high-speed clutch 20, which will be described later.
A and the intermediate gear 14B are connected, and when the rotation of the intermediate gear 14B is high, the connection between the intermediate gear 14B and the clutch gear 14A is released.

When traveling at 2nd speed or higher, the rotation of the input shaft 6 is transmitted from the input pulley shaft 5, which rotates integrally with the input shaft 6, to the output pulley shaft 19 via the bell eye 8.
It is transmitted to the differential mechanism 16 via the high-speed clutch (hereinafter referred to as Hl clutch) 20 that rotates integrally with the intermediate gear 14B and the output shaft 15 (indicated by the three-dot chain line in the figure).
.

The input shaft rotation detection mechanism of the conventional continuously variable transmission is based on the input shaft 6.
The rotation of By providing a plurality of convex portions 24a, attaching the rotation detector 26 to the case 2 in proximity to the convex portions 24a, and detecting the convex portion 24afc that crosses the vicinity of the detection portion of the rotation detector 26, the input shaft 6 can be detected. It is configured to detect rotation.

(Problem to be Solved by the Invention) However, in such a conventional input shaft rotation detection mechanism of a continuously variable transmission, the detection protrusion 24a has an outer diameter dimension from the center line of the input shaft 6. Since it is disposed on the outer periphery of the movable wall 24 of the large input pulley, (1) the circumferential speed of the convex portion 24a that crosses the rotation detector 26 becomes too high, resulting in poor detection accuracy. In addition, if the number of convex portions 24a is increased, the weight and inertia of the movable wall 24 will increase, and the belt durability and responsiveness will deteriorate.
4 deformation occurs, and the movement of the movable wall 24 in the axial direction becomes defective. In addition, ■Movable wall 2 by hydraulic pressure of input pulley
Considering the cylinder deformation of 4, the rotation detector 26 and the recess 2
It is necessary to adjust the gap with respect to the rotation detector 4a, which deteriorates workability and further requires higher sensitivity of the rotation detector 26.

Furthermore, since the movable wall 24 that moves in the axial direction is provided with the convex portion 24a, there are many problems in that adjustment must be made to maintain the same sensitivity throughout the movable range.

Therefore, the present invention provides an uneven groove for generating a magnetic field on the outer periphery of the dog clutch sleeve, which has a small outer diameter from the center line of the input shaft, moves integrally with the dog clutch sleeve, and is mounted with precision. By attaching a rotation detector for magnetic field detection to a high fork, stable detection is possible even at high rotations, cost is reduced by eliminating the need for new components, and the input is less likely to be deformed or misaligned, improving sensitivity. An object of the present invention is to provide a continuously variable transmission having a shaft rotation detection mechanism.

(Means for Solving the Problems) In order to achieve the above object, the continuously variable transmission device according to the present invention includes a case and a continuously variable transmission mechanism that is pivotally supported by the case, is connected to a drive source, and is used for second or higher speeds. An input member that is arranged between an input shaft that is integrally connected to the input pulley shaft, and an l-speed gear and a reverse gear that are rotatably provided on the input shaft, and that can rotate integrally with the input shaft while driving. a first speed clutch gear integrally connected to the first speed gear; a reverse clutch gear integrally connected to the reverse gear; and a connection between the input member and the first speed crunch gear or reverse clutch gear. a dog clutch mechanism that includes a sleeve that can selectively move between the two and engage with each other, rotates in synchronization with the input member, and has an outer diameter smaller than the input pulley shaft; and a fork that moves the sleeve. The continuously variable transmission is characterized in that a plurality of uneven grooves are provided in the circumferential direction on the outer periphery of the sleeve, and a magnetic field rotation detector is provided on the fork adjacent to the uneven grooves.

(Function) The continuously variable transmission of the present invention has a plurality of concave and convex grooves in the circumferential direction on the outer periphery of a sleeve that meshes with an input member that rotates integrally with the input shaft while traveling and rotates in synchronization with the input member. At the same time, a magnetic field rotation detector is provided on the fork near the uneven groove, so the rotation speed of the sleeve is the same as that of the input shaft, and by measuring the rotation speed of the sleeve, the rotation speed of the input shaft can be determined. Can measure rotation speed.

In addition, since the sleeve has a smaller outer diameter than the input boob shaft, the circumferential speed of the uneven grooves on the outer circumference of the sleeve is relatively slow due to the small outer diameter, allowing stable measurement even during high-speed rotation. .

Further, since the magnetic field rotation detector is provided on the fork and there is no need to provide any specific components, the magnetic field rotation detector can be easily installed and manufacturing costs can be reduced.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 1.2 is an enlarged sectional view showing a main part A of an embodiment of the continuously variable transmission according to the present invention. is the same as Components that are the same as those of the conventional device shown in FIG. 3 are given the same reference numerals, and detailed explanations will be omitted.

In FIG. 1, reference numeral 31 denotes a continuously variable transmission, and the continuously variable transmission 31 has an input shaft rotation detection mechanism 32 near the dog clutch mechanism 11. The continuously variable transmission 31 is disposed between the l-speed gear 12 and the reverse gear 34, which are rotatably provided on the input shaft 6, and is connected to the input shaft 6 integrally via the D/R clutch 9 while driving. It has a ring-shaped input member 35 with a small diameter that can be rotated. D/R Kurasoji 9 is
It has a clutch drum 9A spline-engaged with the input shaft 6 at the center of the input shaft 6, and a connecting clutch shell 9B that rotates integrally with the input member 35. By applying hydraulic pressure to the equipped clutch plate, D/
The R clutch 9 can be connected and released. When the vehicle is running, hydraulic pressure acts on the clutch plate, the D/R clutch 9 is connected, and the input shaft 6 and input member 35 rotate integrally, and when the vehicle is stopped, the D/R clutch 9 is released.

A sleeve 37 is provided inside the first gear 12 and rotates integrally with the first gear 12 and rotatably slides on the input shaft 6. Adjacent to the l-speed gear 12, an l-speed clutch gear 38 is provided which is rotatably spline-coupled integrally with the l-speed gear 12.

A bearing is interposed between the reverse gear 34 and the connecting cylinder 9B so that the reverse gear 34 can rotate freely, and a bearing adjacent to the input member 35 is located outside the reverse gear 34. A reverse clutch gear 39 is provided which is rotatably spline-coupled integrally with the reverse gear 34 .

41 is a tongue clutch sleeve, and the dog clutch sleeve 41 is connected to the input member 35 on the outside of the input member 35;
1st speed clutch gear 38 or reverse clutch gear 39
The 1st speed gear 12 is selectively movable between the 1st speed clutch gear 38 and the 1st speed clutch gear 38.
or the reverse gear 34 is rotatable synchronously with the input member 35 via the reverse clutch gear 39, respectively.

The outer diameter 041 of the tongue clutch sleeve 41 is significantly smaller than the outer diameter D□ of the input boom shaft 5 and the movable wall 24 on the movable side of the input boom corresponding to the input pulley shaft 5. On the outer periphery of the tongue clutch sleeve 41, axial detection grooves 41a, which are a plurality of uneven grooves for detecting rotation, are provided at intervals in the circumferential direction.

43 is a fork, and the fork 43 is close to the outer periphery of the tongue clutch sleeve 41 and extends semi-circumferentially to form a fork shape. At both ends of the fork 43, gripping parts 43a are provided which protrude toward the center from both sides of the tongue clutch sleeve 41 in the axial direction so as to grip the tongue clutch sleeve 41. A connecting hole 43b is provided for connecting to a moving means (not shown). The fork 43 and the moving means constitute the dog clutch/7ch mechanism 11. The means of movement is connected to the shift lever.

45 is an electromagnetic pink amplifier which is a magnetic field rotation detector,
The electromagnetic pickup 45 is provided on the fork 43 close to the detection groove 412 of the dog clutch sleeve 41, and is capable of detecting the rotation speed of the dog clutch sleeve 41.

Next, the effect will be explained.

In the continuously variable transmission device 31 of the present invention, while driving, D
Since the /R clutch 9 is connected, the dog clutch sleeve 41 is connected to the input member 3 that rotates integrally with the input shaft 6.
5 and rotates in synchronization with the input shaft 6. That is,
The rotation speed of the dog clutch sleeve 41 is the same as the rotation speed of the input shaft 6.

In the input shaft rotation detection mechanism of the continuously variable transmission of the present invention, a detection a41a is provided on the outer periphery of the dog clutch sleeve 41, and an electromagnetic pickup 45 is provided on the fork 43 in proximity to the detection 1JI 41a. By measuring the rotation speed of the dog clutch sleeve 41 with the electromagnetic pickup 45, the rotation speed of the input shaft 6 can be measured. Further, since the outer diameter D41 of the dog clutch sleeve 41 is significantly smaller than the outer diameter Dt4 of the outer circumference of the conventional movable wall 24, the detection rl! The circumferential speed of the pin 412 is relatively slow due to the small outer diameter, and the electromagnetic pink-up 45 can stably detect even when the input shaft 6 rotates at high speed.

In addition, the electromagnetic pink-up 45 is provided on the conventional fork 43, and there is no need to provide any specific components, so the structure of the input shaft rotation detection mechanism can be simplified, and manufacturing costs can be significantly reduced.

Furthermore, the detection groove 41a of the present invention is provided on the outer periphery of the ring-shaped dog clutch sleeve 41 with a small outer diameter, and is not cylindrical as in the conventional case, so there is less risk of deformation or misalignment. The electromagnetic pickup 45 can be placed sufficiently close to the electromagnetic pickup 412, and the sensitivity of the electromagnetic pickup 45 can be greatly improved.

(Effects) As explained above, according to the present invention, an uneven groove for generating a magnetic field is provided on the outer periphery of a dog clutch sleeve having a small outer diameter, and the groove moves integrally with the dog clutch sleeve to attach the sleeve. By attaching a rotation detector for magnetic field detection to a high-precision fork, stable detection is possible even during high-speed rotation, there is no need for new components, and costs can be significantly reduced, and there is also less deformation and misalignment. , the sensitivity can be significantly improved.

[Brief explanation of drawings]

1.2 is a diagram showing the main part of one embodiment of the input shaft rotation detection mechanism of the continuously variable transmission according to the present invention, FIG. 1 is an enlarged sectional view of the main part, and FIG. It is a sectional view taken along the line ■-■ in the figure. FIG. 3 is an overall sectional view showing an input shaft rotation detection mechanism of a conventional continuously variable transmission. 2... Case, 4... Continuously variable transmission mechanism, 11... Dog clutch mechanism, 12...
・1st speed gear, 31... Continuously variable transmission, 34... Reverse gear, 35... Input member, 41... Dog clutch sleeve, 41a...
...Detection groove (uneven groove) 43...Fork,

Claims (1)

[Claims] a case, an input shaft that is pivotally supported by the case, is connected to a drive source, and is integrally connected to the input pulley shaft of a continuously variable transmission mechanism used for second speed or higher; and a first speed that is rotatably provided on the input shaft. an input member disposed between the forwarding gear and the reverse gear and capable of rotating integrally with the input shaft while driving; a first speed clutch gear integrally connected to the first speed gear; and an input member integrally connected to the reverse gear. a reverse clutch gear coupled to the input member and the first speed clutch gear or the reverse clutch gear, which can be selectively moved between the input member and the first speed clutch gear or the reverse clutch gear to engage with each other, and rotate in synchronization with the input member; A continuously variable transmission device comprising a sleeve having an outer diameter smaller than an input pulley shaft and a dog clutch mechanism having a fork for moving the sleeve, the sleeve having a plurality of uneven grooves in the circumferential direction on its outer periphery. A continuously variable transmission characterized in that a magnetic field rotation detector is provided on the fork in the vicinity of the uneven groove.