JP3496350B2 - Toroidal type continuously variable transmission - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a bearing for supporting a power roller in a toroidal type continuously variable transmission used in a vehicle or the like.

[0002]

2. Description of the Related Art A structure shown in FIG. 3 is known as a structure for supporting a power roller of a toroidal type continuously variable transmission.

This will be described below. As shown in FIG. 3, a pair of toroidal input disks 1 are provided.
8. The output disk 20 is arranged coaxially with the input shaft 14, and the change of the inclination angle of the pair of power rollers 22, 22 pressed against the input disk 18 and the output disk 20 can be changed to an arbitrary gear ratio. It can be set steplessly.

Belleville spring 70 provided on the base end side of the input shaft 14
And the pressure generated by the cam roller 79 provided on the left end side of the input shaft 14 causes the input disc 18 and the output disc 2 to
The power roller 22 sandwiched between 0 and 0 transmits torque from the input disk 18 to the output disk 20, and drives an output shaft (not shown) via an output gear 26 that rotates integrally with the output disk 20.

The power roller 22 is rotatably supported by a shaft 2 projecting toward an input shaft 14 from a trunnion 1 which is displaceable in a penetrating direction of the paper surface in the drawing and is swingable about an axis, so that the trunnion 1 can be rotated. The gear ratio is changed by changing the inclination angle while rotating according to the axial displacement and changing the contact radius of the input disk 18 and the output disk 20. This axis 2
Is configured with a predetermined eccentric shaft in order to tilt the power roller 22 according to the displacement of the trunnion 1 in the penetrating direction of the paper surface.

Since the power roller 22 needs to rotate at a high speed while receiving a large pressure, a ball bearing 3 for supporting the load in the thrust direction of the shaft 2 is interposed between the trunnion 1 and the power roller 22. There is.

As shown in FIG. 4, the ball bearing 3
Is the outer ring 4 ′ and the power roller 22 provided on the trunnion 1.
And an annular rolling groove 5 formed on the outer ring 4 ′, and an annular rolling groove formed on the power roller 22 facing the rolling groove 5 and forming the inner ring side. A plurality of ball bearings 3 sandwiched between the moving grooves 23 and revolve around the shaft 2 along the rolling grooves 5 and 23.

In such a ball bearing 3, the force and speed acting on each ball bearing 3 differ depending on the manufacturing precision of the balls and the rolling grooves 5 and 23 or the uneven load applied.

Therefore, the ring-shaped cages 7a and 7b which engage with the inner circumference and the outer circumference of each ball bearing 3 (the side facing the shaft 2 is the inner circumference, and the opposite side of this inner circumference is the outer circumference) are respectively provided. The ball bearings 3 are arranged coaxially with the ball revolving shaft 2 and the non-uniform forces acting on the ball bearings 3 are dispersed and supported by the cages 7a and 7b to rotate the ball bearings 3 correctly.

Between the power roller 22 and the shaft 2,
Roller bearing 16 for radial positioning
Is installed.

[0011]

However, in the toroidal type continuously variable transmission as described above, the cages 7a and 7b also rotate around the shaft 2 in response to the rolling of the ball bearing 3, but these cages are also used. 7a and 7b are ball bearings 3
Since it is supported only by the balls, an uneven force acting on each ball is applied to the cages 7a and 7b, and as shown in FIG. 5, the center of rotation C ₂ of the cages 7a and 7b is changed to that of the rolling grooves 5 and 23. It is eccentric with respect to the revolution center C ₁ . Due to the eccentricity of the cage and the rolling groove, the ball bearing 3 is deviated from the center of the rolling grooves 5 and 23, and the life of the ball bearing 3 is shortened due to the progress of wear, and all the forces acting on the ball bearing 3 are retained by the cages 7a and 7b. In order to receive it, the strength of the cage must be ensured, and further, the rotational imbalance caused by the manufacturing precision of the cages 7a and 7b must be supported by the cage itself, and this rotational imbalance is supported. There was a problem that the strength for

Therefore, the present invention has been made in view of the above problems. By rotating the retainer of the ball bearing supporting the power roller around the rolling groove, the life of the ball bearing and the retainer strength are increased. The purpose is to secure.

[0013]

A first invention is to provide an input disk connected to an input shaft, an output disk connected to an output shaft, and a rotary shaft at a predetermined position facing these input / output disks. The trunnion provided, a shaft protruding from the trunnion toward the input / output disk, and a toroidal groove formed in each of the facing surfaces of the input / output disk were sandwiched and inserted into the shaft. A power roller, an outer ring that is disposed on the trunnion side facing the power roller and guides a plurality of rolling elements that pivotally support the power roller, and an annular retainer that guides the rolling elements. In the toroidal type continuously variable transmission, a displacement regulating means for regulating the radial displacement of the cage is provided on at least one of the power roller and the outer ring, the same as the shaft.
Formed by projecting an axial cylindrical protrusion, and the side surface of this protrusion
Engage with the inner circumference of the retainer.

[0014]

The second aspect of the invention is that the input shaft is connected to the input shaft.
An input disc and an output disc coupled to the output shaft,
A rotary shaft is provided at a predetermined position facing these input / output disks.
The trunnion and the input / output di
A pair of the I / O disk and the shaft protruding toward the disk.
It is sandwiched by the toroidal grooves formed on the facing surfaces.
Along with the power roller inserted through the shaft,
Power is provided on the trunnion side facing the warroller.
Outside that guides multiple rolling elements that support the rollers so that they can roll freely
A wheel having a ring and an annular retainer for guiding the rolling element.
In toroidal type continuously variable transmission, the displacement restricting means for restricting the displacement in the radial direction of the cage to engage the outer periphery of the retainer
To at least one of the power roller or outer ring
Form.

[0016]

Therefore, according to the first aspect of the invention, the power roller sandwiched between the input disk and the output disk tilts in accordance with the displacement of the trunnion to continuously change the gear ratio. The power roller is inserted through a shaft protruding from the trunnion, and is axially supported by a plurality of rolling elements interposed between the outer ring disposed on the trunnion side and the power roller, and the rolling element rotates the power roller. However, since the cage is restricted in radial displacement by the displacement restricting means, the center of revolution of the rolling element and the center of rotation of the cage can always be made coincident with each other. Further, the retainer can disperse the centrifugal force given from the rolling elements, the centrifugal force of itself, etc. to the displacement restricting means.

Further , the retainer can engage with the displacement restricting means on the inner peripheral side so that the revolution center of the rolling element and the rotation center of the retainer coincide with each other.

According to the second aspect of the invention, the retainer can engage with the displacement regulating means on the outer peripheral side to match the revolution center of the rolling element with the rotation center of the retainer, and the rolling element of the retainer A force such as a centrifugal force applied to the outer peripheral side can be dispersed in the displacement regulating means.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, a case where the present invention is applied to the toroidal type continuously variable transmission shown in FIG. 3 of the conventional example is shown, and a rolling groove for guiding a plurality of ball bearings 3 as rolling elements is shown. The outer ring 4'forming 5 is replaced with the outer ring 4 that engages with the inner circumference of the cage 7a. Others are the same as those of the conventional example, and the same parts are designated by the same reference numerals and will be described. Omit it.

A retainer 7a is provided on the inner circumference of the ball bearing 3.
However, a retainer 7b is engaged with the outer periphery, and a cylindrical protrusion 6 that engages with the inner periphery of the retainer 7a is provided on the outer ring 4 as a displacement regulating means so as to project toward the power roller 22 side. It

The projection 6 is formed coaxially with the rolling groove 5, that is, has a predetermined radius centered on the axis of the shaft 2 and the inner circumference of the cage 7a which rotates about the shaft 2. The side surface is engaged to regulate the radial displacement of the retainer 7a.

With the above construction, the operation will be described below.

When the ball bearing 3 rotates along the rolling grooves 5 and 23 as the power roller 22 rotates, the cages 7a and 7b rotate as the ball bearing 3 revolves.

Since the retainer 7a is engaged with the convex portion 6 formed on the outer ring 4 on the inner circumference thereof, it is not deformed in the radial direction. Therefore, the retainer 7a always has its rolling center around the center of rotation.
It is possible to rotate while matching the center of the ball bearing, that is, the center of revolution of the ball bearing 3.

As shown in the above-mentioned conventional example, each ball bearing 3 is caused by an error in manufacturing the ball bearing 3.
When applying a non-uniform force to the cages 7a and 7b, even if the cage 7b on the outer circumference attempts to be displaced in the radial direction according to the resultant force of the non-uniform forces (see FIG. 5), Since the container 7a engages with the convex portion 6 of the outer ring 4 and restricts the radial displacement, the retainers 7a and 7b can make the revolution center of the ball bearing 3 coincide with the revolution center of the rolling groove 5. .

Therefore, unlike the conventional example, the ball bearing 3 is not eccentric from the rolling groove 5, and the eccentricity between the revolution center of the ball bearing 3 and the revolution center of the rolling groove 5 prevents wear. The life of the ball bearing 3 and the rolling grooves 5 and 23 can be ensured.

Further, the force applied to the cages 7a and 7b is
Since it is transmitted to the convex portion 6 of the outer ring 4 and dispersed, the cage 7
Unlike the conventional example, a and 7b do not need to secure the strength for supporting all the forces received from the ball bearing 3 and the rotational imbalance, but only the strength according to the distribution of the force dispersed to the convex portion 6. It suffices to provide it, and it is possible to reduce the strength as compared with the above-mentioned conventional example.
The reliability can be improved while reducing the weight of a and 7b.

Although the convex portion 6 is formed in a cylindrical shape, it is not shown, but the same applies to an annular shape having a predetermined thickness in the radial direction.

FIG. 2 shows a second embodiment, in which a step portion 17 is formed in the lower outer periphery of the retainer 7b which engages with the outer periphery of the ball bearing 3, and the step portion 1 of the retainer 7b is formed on the outer ring 4.
An annular convex portion 8 engaging with 7 is provided so as to project toward the power roller 22.

The convex portion 8 is formed coaxially with the rolling groove 5 along the peripheral edge of the outer ring 4, and the inner peripheral side surface of the convex portion 8 engages with the step portion 17 of the retainer 7b. Similarly to the above, the radial displacements of the cages 7a and 7b are regulated so that the cages 7a and 7b and the rolling center of the rolling groove 5 are always aligned with each other.

Here, the step portion 17 is formed in a direction in which the outer diameter is reduced from the outer peripheral side surface of the cage 7b, and suppresses the outer diameter of the outer ring 4 protruding from the convex portion 8 from increasing.

In this case, in addition to the effect of the first embodiment, the centrifugal force applied to the ball bearing 3 and the retainer 7b can be directly received by the convex portion 8, and the force applied to the retainer 7b is further increased. 4 side, retainer 7a,
The strength required for 7b can be further reduced, and it is possible to promote improvement in reliability and reduction in size and weight.

In the above embodiment, the outer ring 4 is provided with one of the protrusion 6 that engages with the retainer 7a and the protrusion 8 that engages with the retainer 7b. Although not provided, the outer ring 4 is provided with the protrusions 6 and 8 together, and the retainers 7a and 7
The radial displacement may be restricted at the inner circumference and the outer circumference of b.

Further, in the above embodiment, the convex portions 6 and 8
Although the outer ring 4 is formed on the outer ring 4, it may be projected from the power roller 22 toward the outer ring 4, or the convex portion 6 may be formed on the outer ring 4.
The convex portion 8 may be formed on the power roller 22.

Further, in the above embodiment, the convex portions 6 and 8
Although it is formed continuously as a column or an annular shape, although not shown, it may be formed intermittently by a columnar member standing upright at a predetermined interval along the outer and inner circumferences of the retainers 7a and 7b. .

[0037]

As described above, according to the first aspect of the present invention, the retainer can always make the revolution center of the rolling element and the rotation center of the retainer coincident with each other by the displacement regulating means. Is no longer eccentric from the center of revolution,
It is possible to prevent wear due to eccentricity, secure the life of the rolling elements and the outer ring, and improve the reliability. Furthermore, since the force applied to the cage is distributed to the displacement restricting means, it is possible to reduce In addition, it is not necessary to support all the forces such as the rotational imbalance due to the manufacturing precision of the rolling elements and the cage, and it is sufficient to provide only the strength corresponding to the distribution of the force distributed to the displacement regulating means. The strength can be reduced as compared with the example, and the reliability can be improved while reducing the weight of the cage.

Further , the retainer can engage with the displacement regulating means on the inner peripheral side to match the revolution center of the rolling element with the rotational center of the retainer, and the rolling element gives the centrifugal force to the outer peripheral side of the retainer. The force such as the force can be dispersed to the displacement regulating means via the rolling elements and the inner peripheral side of the cage.

Further, in the second aspect of the invention, the cage is engaged with the displacement regulating means on the outer peripheral side so that the revolution center of the rolling element and the rotation center of the cage can coincide with each other, and the rolling element of the cage is the same. A force such as a centrifugal force applied to the outer peripheral side can be dispersed in the displacement regulating means.

[Brief description of drawings]

FIG. 1 is a sectional view of essential parts showing a power roller and a ball bearing.

FIG. 2 is a sectional view of a power roller and a ball bearing according to a second embodiment.

FIG. 3 is a sectional view of a main part of a conventional toroidal continuously variable transmission.

FIG. 4 is a cross-sectional view of a power roller and a ball bearing showing a conventional example.

FIG. 5 is a conceptual diagram showing an eccentricity of a cage and a rolling groove.

[Explanation of symbols]

1 trunnion 2 axes 3 ball bearings 4 outer ring 5,23 rolling groove 6,8 convex part 7a, 7b cage 18 Input disc 20 output discs 22 Power roller

Continuation of the front page (56) Reference JP-A-6-307513 (JP, A) JP-A-61-119817 (JP, A) JP-A-5-187496 (JP, A) JP-A-7-71555 (JP , A) Actually open 7-35847 (JP, U) Actually open 62-179458 (JP, U) Actually open 3-104523 (JP, U) Actually open 48-22989 (JP, Y1) US Patent 4964312 (US, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16H 13/00-15/56 F16C 19/00-19/56 F16C 33/30-33/66

Claims (2)

(57) [Claims] 1. An input disk connected to an input shaft, an output disk connected to an output shaft, a trunnion having a rotation shaft at a predetermined position facing these input / output disks, and the input from the trunnion. A shaft protruding toward the output disc, a power roller inserted between the shaft and sandwiched between toroidal grooves formed on the facing surfaces of the input / output disc, and facing the power roller. A toroidal type continuously variable transmission including an outer ring that is arranged on the trunnion side and rotatably guides a plurality of rolling elements that axially support a power roller; and an annular retainer that guides the rolling elements. Displacement restricting means for restricting radial displacement of the cage is formed by projecting a columnar convex portion coaxial with the shaft on at least one of the power roller or the outer ring ,
A toroidal type continuously variable transmission characterized in that a side surface of the convex portion engages with an inner circumference of the cage . 2. An input disk connected to an input shaft, an output disk connected to an output shaft, and a rotary shaft at a predetermined position facing these input / output disks.
The trunnion and the protruding trunnion from the trunnion toward the I / O disk.
And the axis formed on the facing surface of the input / output disk.
It was clamped in the id-shaped groove and inserted into the shaft.
The power roller and the trunnion side facing the power roller
Rollably guide multiple rolling elements that support the power roller
Having an outer ring that moves and an annular cage that guides the rolling element
In Le type continuously variable transmission, the displacement in the radial direction of the cage to engage the outer periphery of the retainer
Displacement control means to control the power roller or outer ring
Chino Troy characterized in that it is formed in at least one
Dull type continuously variable transmission.