JP3521697B2 - Lubrication mechanism for toroidal type continuously variable transmission - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a lubrication mechanism of a toroidal type continuously variable transmission used in a vehicle or the like. 2. Description of the Related Art Conventionally, as a continuously variable transmission for vehicles, a pair of input disks and output disks formed in a toroidal shape are arranged coaxially with an input shaft, and are sandwiched between input and output disks. Tilt angle (tilt angle) of a pair of pressed power rollers
A toroidal type continuously variable transmission which can set an arbitrary speed ratio in a stepless manner by changing the power ratio is known, and the power roller of such a toroidal type continuously variable transmission is eccentric to a tiltable trunnion. A rotatably supported shaft via a pivot shaft is known, for example, from Japanese Patent Application Laid-Open No. 7-174201. [0003] This is, as shown in FIG.
Are rotating shaft portions 3a, 3 coaxial with the rotating shaft 3z on the upper and lower end sides.
On the other hand, an offset portion 3c that protrudes in the outer peripheral direction of the input / output disk in order to accommodate the power roller 1 is formed between the rotating shaft portions 3a and 3b while forming the rotary shaft 3b. The power roller 1 is supported by a pivot shaft 2 eccentric by a predetermined amount. The pivot shaft 2 has a base end having an offset portion 3c of the trunnion 3.
In while being swingably supported, the power rollers 1 is supported by a tip portion is rotated about the shaft C _2. The power roller 1 is rotatably supported between the power roller 1 and the offset portion 3c via a ball bearing 8 and an outer ring 7 as bearing members.
Is positioned in the radial direction via a roller bearing 9 on the front end side. Note that a roller bearing 13 is interposed between the outer ring 7 and the offset portion 3c to support the thrust force received by the power roller 1. A rod 6b is connected to the lower end of the trunnion 3, and the piston 6a of the hydraulic servo cylinder 6 connected to the rod 6b drives the trunnion 3 in the axis (3z) direction, so that the power roller 1 rotates. It rotates around the axis 3z (hereinafter referred to as tilting), and the contact radius between the input disk and the output disk changes, so that the gear ratio is continuously changed. [0007] Incidentally, trunnion 3,3 arranged opposite each other across the input and output shafts C ₀ is connected to each other rotary shaft portion 3a with each other of the upper side by a link 4, the rotation shaft portion 3b between the lower side The trunnions 3 are connected to each other via a link 5 and resist thrust forces applied to the power rollers 1 and 1.
The distance between the three rotation axes 3z, 3z is kept constant. Here, a ball bearing 8 that supports the power roller 1 and a rolling surface 1 of the power roller 1 and the outer ring 7 are provided.
The lubrication of the oil passages 1 and 7a is performed by the oil passage 1 penetrating the offset portion 3c.
The oil guided from 1 to an oil passage 15 formed inside the pivot shaft 2 through an oil passage branched to the roller bearing 13 side is formed substantially perpendicularly to the oil passage 15 and in the penetrating direction in FIG. The oil is injected from an oil supply hole 16 opened on the outer periphery of the pivot shaft 2 at a position facing the ball bearing 8, so that the ball bearing 8 interposed between the power roller 1 and the outer ring 7, the power roller 1, and the outer ring 7, the rolling surfaces 1a, 7a are lubricated. In addition, oil passage 15
Oil is also supplied to the roller bearing 9 from the tip of the roller bearing 9. The oil passage 11 communicates with an oil passage 12 formed in the lower part of the trunnion 3 on the side of the rotating shaft 3b, and receives supply of oil from a hydraulic source (not shown). The oil passage 1 penetrating through the offset portion 3c
Nozzles 14 are formed at both ends of 1 to lubricate the links 4, 5 and the rotating shaft portions 3a, 3b. However, in the lubricating mechanism of the conventional toroidal type continuously variable transmission, the oil supply port 16 of the ball bearing 8 that supports the power roller 1 is provided with the power roller. because of the position eccentric with respect to the first rotation axis C _2, the ball bearing 8 and the rolling surfaces 1a, 7a lubrication and cooling of the uniform is difficult to perform all around, each ball bearing 8 and the rolling surface There was a problem that the temperatures of 1a and 7a could not be kept uniform, and the strength of the pivot shaft 2 was reduced when the number of oil supply ports 16 was increased to give priority to lubrication. The pivot shaft 2 can swing about the base end on the trunnion 3 side. When the pivot shaft 2 swings, the direction of injection from the oil supply port 16 also changes.
There is also a problem that it is difficult to always secure an optimal lubricating oil supply position. SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and provides a lubrication system for a power roller and a bearing which are supported by an eccentric pivot shaft without reducing the strength of the pivot shaft. The purpose is to ensure that this is done. According to a first aspect of the present invention, a pivot shaft rotatably supported by a trunnion and having a base end swingably supported by an input / output disk is provided. A bearing member interposed between the power roller and the trunnion facing the power roller and supporting the power roller, and communicating with an oil passage formed inside the trunnion and the pivot shaft, and the bearing member A lubricating mechanism for a toroidal type continuously variable transmission having a lubricating oil supply port opened on the outer periphery of the pivot shaft facing the lubricating oil supply port. The ring that defined the road,
An opening that is formed through the ring and supplies lubricating oil to the bearing member at a predetermined position ;
When pivotally supported around the pivot shaft axis
In both cases, weights are fixed at predetermined positions . Therefore, according to the first invention, the bearing member which supports the power roller in the thrust direction is lubricated with oil from the oil passage formed inside the trunnion and the pivot shaft. Cooling is being performed, and the oil guided to the lubricating oil supply port opened on the outer periphery of the pivot shaft is injected toward the bearing member from the opening provided at a predetermined position after filling the inner periphery of the ring. Therefore, the position and number of openings formed in the ring can be set to those required for lubrication and cooling. At this time, since it is not necessary to process the pivot shaft, it is necessary to secure the strength of the pivot shaft. Lubrication can be performed at an optimum position, and the lubrication performance can be improved to improve the durability of the toroidal type continuously variable transmission. Since the ring is rotatable about the axis of the pivot shaft and a weight is provided at a predetermined position, when the power roller tilts and the pivot shaft swings about the base end, the ring Rotates so that the weight is positioned in the direction of gravity, and the opening can always spray oil in a predetermined direction with respect to the direction of gravity, so that the optimal lubricating oil supply position is always available regardless of the swing of the pivot shaft. Can be maintained, and the lubrication and cooling performance can be improved as compared with the conventional example. An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows an example in which the present invention is applied to the toroidal type continuously variable transmission shown in FIG. 5 of the conventional example. 1 and 2, a power roller 1 is provided inside a pivot shaft 2 which supports the power roller 1.
An oil passage 15 is formed along the axial direction of the trunnion 3.
Communicates with the oil passage 11 formed inside. The outer periphery of the pivot shaft 2 opposed to the ball bearing 8 as a bearing member interposed between the power roller 1 and the outer ring 7 is provided on the outer periphery in the horizontal direction of FIG. 2 (through the paper surface of FIG. 1). The oil supply port 16 (lubricating oil supply port) communicates with the oil passage 15 on the way. A ring 2 having a substantially U-shaped cross section is provided on the outer periphery of the pivot shaft 2 having the oil supply port 16 opened.
0 is fitted so as to cover the oil supply port 16 to form an annular oil passage inside. The radial height of the ring 20 is set such that the ball bearing 8 extends from the outer periphery of the pivot shaft 2.
Of the ring 20 (the length in the axial direction of the pivot shaft 2).
Is set to a dimension that does not come into contact with the relatively rotating power roller 1. An injection port 21 for injecting oil toward the ball bearing 8 is provided at a predetermined position of the ring 20.
A plurality of openings (openings) are formed, and for example, as shown in FIG. 2, they are arranged at the uppermost part of the ring 20 and a total of three places on both sides of the uppermost part. The operation as described above will now be described. The oil guided to the oil supply port 16 through the oil passage 11 of the trunnion 3 and the oil passage 15 of the pivot shaft 2 is supplied to a ring 20 covering the outer periphery of the pivot shaft 2.
After flowing into the inside of the ring 20 and filling the inside of the ring 20, the ball bearing 8
Ball bearing 8 and rolling surface 1
a, 7a are lubricated and cooled. Since this oil injection is performed at the position where the injection port 21 is provided, as shown in this embodiment, the optimum injection position is set at the uppermost part of the ring 20 as shown in FIG. In the case of obliquely upward, the oil can be sprayed upward and obliquely upward from a total of three places toward the upper side of the ring. Ball bearing 8 that tends to be thin
The lubrication and cooling of the power roller 1, the outer ring 7, and the ball bearing 8 can be reliably performed by mainly supplying oil to the upper portions of the rolling surfaces 1a, 7a. Can be set as desired. The ring 20 is connected to the pivot shaft 2.
, It is not necessary to process the pivot shaft 2, it can be easily attached to the pivot shaft 2 as in the conventional example, and the strength of the pivot shaft 2 can be secured. The durability of the toroidal type continuously variable transmission can be improved. FIGS. 3 and 4 show a second embodiment, in which a weight 22 is provided below the ring 20 of the first embodiment, and the ring 20 is connected to the axis C of the pivot shaft 2.
_{The second} embodiment is rotatable around ₂ , and the other configuration is the same as that of the first embodiment. Furthermore, because of the rotatable ring 20 about the shaft C _2, ring 20 so becomes displaceable also in the axial direction of the pivot shaft 2, the inner periphery of the ring 20 oil supplied to the pivot shaft 2 In order to maintain the position facing the mouth 16, the circlips 24, 2 shown in FIG.
4, the displacement in the axial direction is regulated. In this case, since the weight 22 is provided below the ring 2 and the ring 20 is rotatable around the axis C ₂ of the pivot shaft 2, the power roller 1 is tilted and the pivot shaft 2 is Swings around the axis to rotate the ring 20 so that the weight 22 is located at the lowermost position (in the direction of gravity). Therefore, regardless of the swing of the pivot shaft 2, the injection port 21 can always inject oil upward and diagonally upward, and can always maintain an optimal lubricating oil supply position. As a result, the lubrication and cooling performance can be improved as compared with the conventional example. In the above-described embodiment, the optimum lubricating oil supply position is set to the uppermost position and obliquely upward. However, the optimum lubricating oil supply position is changed depending on the mounting direction of the toroidal type continuously variable transmission. The opening position of the injection port 21 may be appropriately changed according to the mounting direction and the like.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of a trunnion and a power roller showing one embodiment of the present invention. FIG. 2 is a sectional view taken along the line AA of FIG. FIG. 3 is a longitudinal sectional view of a trunnion and a power roller according to the second embodiment. FIG. 4 is a sectional view of a pivot shaft and a ring. FIG. 5 is a longitudinal sectional view of a toroidal type continuously variable transmission, showing a conventional example. [Description of Signs] 1 Power roller 2 Eccentric shaft 3 Trunnion 4, 5 Link 6 Hydraulic servo cylinder 6a Piston 6b Shaft 7 Outer ring 8 Ball bearing 9 Roller bearing 10 Casing 11, 12 Oil path 13 Roller bearing 14 Nozzle 15 Oil path 16 Oil supply port 20 Ring 21 Injection hole 22 Weight

Claims (1)

(57) A power roller sandwiched between opposing surfaces of an input / output disk and rotatably supported by a pivot shaft whose base end is swingably supported by a trunnion. A bearing member interposed between a trunnion facing the power roller and supporting the power roller, and a pivot communicating with an oil passage formed inside the trunnion and the pivot shaft and facing the bearing member In a lubrication mechanism for a toroidal-type continuously variable transmission having a lubricating oil supply port opened on the outer periphery of a shaft, the lubrication mechanism is disposed on a pivot shaft at a position covering the lubricating oil supply port, and defines an oil passage therein. a ring and, formed through this ring, and an opening for supplying lubricating oil to the bearing member at a predetermined position, the ring, the axis of the pivot shaft or Ride rotatable
And weights are fixed in place.
A lubrication mechanism for toroidal-type continuously variable transmissions.