JP4956796B2 - Toroidal continuously variable transmission - Google Patents

Description

  The present invention relates to a toroidal continuously variable transmission that transfers power between input and output disks by frictional engagement of a power roller, and includes foreign matters such as iron pieces (hereinafter referred to as such foreign matters) contained in lubricating oil. Indentation on the frictional engagement surface (rolling surface) caused by biting of the interstitial material is effectively avoided.

  The toroidal type continuously variable transmission has a structure in which power is transferred by power rollers arranged between the input and output disks, and lubricating oil is always supplied to the friction engagement surface (rolling surface). ing. In this type of continuously variable transmission, even if the lubricating oil contains a foreign object having a size and hardness that does not cause a problem in the conventional multi-stage transmission, Since there is a tendency that indentation occurs on the rolling surface and the peeling life is shortened, it is indispensable to use the lubricating oil supplied to the rolling surface from which foreign substances have been removed.

  As one of the routes for supplying lubricating oil to the rolling surface, there is a route for supplying through the internal passage of the main shaft (the shaft that rotatably supports the input / output disk). The lubricating oil supplied through this route is supplied by an oil pump. When sucking from the oil pan, first, the contaminants contained in the lubricating oil are removed by the strainer, and then supplied through the oil passage such as the oil pump, the control valve, and the forward / reverse switching mechanism. In the feeding of the lubricating oil in this path, the foreign matter adhering to each component in the feeding process may be mixed into the lubricating oil and reach the rolling surface as it is. The situation was inevitable.

  In order to eliminate the inconveniences as described above, it is necessary to strictly control whether or not the foreign substances adhere to all the parts forming the lubricating oil path during the manufacture of the transmission, or to remove the foreign substances. It is effective to install (apparatus) separately just before the rolling surface.

  By the way, in the former case, the increase in manufacturing cost is unavoidable due to increased parts cleaning and management man-hours. In the latter case, a large filter that does not cause clogging must be arranged until the guaranteed mileage is reached. Therefore, it was inevitable to enlarge the transmission itself.

As prior art in this regard, an impeller is provided in the vicinity of the central opening of the inlet housing, and the impeller rotates the lubricating oil to move the contaminated contaminants contained therein outward by centrifugal force. Although a scroll type machine is known that reduces the amount of contaminated contaminants contained in the lubricating oil (see, for example, Patent Document 1), the toroidal continuously variable transmission that is the subject of the present invention has an input / output function. Since the main shaft for rotatably supporting the disk is made of a metal member and the diameter thereof is not so large, it is difficult to provide the impeller as described above in the internal passage, and there is still room for improvement.
Japanese Unexamined Patent Publication No. 7-27080

  An object of the present invention is to propose a toroidal continuously variable transmission that can effectively avoid indentations on a rolling surface caused by biting of foreign matters contained in lubricating oil.

  The present invention has been made in order to solve the above-described problems, and the specific means thereof is an oil having an entrance-side opening linked to the shaft end portion of the input shaft and extending along the shaft core. A main shaft provided with a path, an input disk rotatably supported by the main shaft and movable along the axis of the main shaft, and an output disk rotatably supported by the main shaft facing the input disk And a toroidal-type continuously variable transmission that is disposed between these input / output disks and that transfers power by frictional engagement, wherein the oil path is disposed inside the oil path of the main shaft. A cylindrical body that is concentrically arranged to form two paths divided respectively on the outside is provided, and the lubricating oil supplied through the internal passage as the input shaft rotates is applied to the shaft end portion of the input shaft. Outer surface An oil hole is formed in the inlet opening of the main shaft to form a vortex flow of the lubricating oil, and an oil hole connected to the friction engagement surface of the input / output disk is formed in the inner path of the two paths. It is characterized by where it is formed.

  If an oil passage is provided at the shaft end of the input shaft so that the lubricant is ejected obliquely against the inner wall surface of the inlet opening of the main shaft, the lubricating oil is centered on its axis in the main shaft oil passage. A vortex swirling in one direction. When this eddy current is formed, foreign objects such as iron pieces gather outside the oil passage due to centrifugal force, and the lubricating oil flowing in the center of the oil passage becomes relatively clean. Of the two internal and external lubricating oil feed paths formed by the cylindrical body, the degree of biting of the foreign matter is reduced by supplying the friction engagement surface of the input / output disk through the lubricating oil feed path located inside. It becomes possible.

  Lubricating oil containing foreign matter can be used as lubricating oil for gear parts and bearings located at the rear by feeding it to the rear of the transmission unit through the lubricating oil feeding path located outside. (The foreign matter mixed in the lubricating oil is such that it does not affect the use of the multi-stage transmission) and does not affect the oil amount balance of the lubricating oil.

Hereinafter, the present invention will be described more specifically with reference to the drawings.
FIG. 1 is a diagram showing an embodiment of a toroidal continuously variable transmission according to the present invention, taking a double cavity type continuously variable transmission as an example (in the figure, T is a torque converter, and G is a forward / reverse switching portion). FIG. 2 is an enlarged view of the main part of FIG.

  Reference numeral 1 in the figure denotes a main axis. The main shaft 1 is provided with an oil passage 1a extending along the axis L (see FIG. 2). 2 is an input shaft that is linked to the entrance side opening 1b of the main shaft 1, 3a and 4a are rotatably supported on the main shaft 1, and are input disks that can move along the axis L of the main shaft 1, and 3b and 4b are input disks 3a , 4a, output disks 5a, 5b, 6a, 6b that are rotatably supported by the main shaft 1 are power rollers (the other of the rollers is located in front of the sheet (not shown)). These power rollers 5a, 5b, 6a and 6b are arranged between the input disks 3a and 4a and the output disks 3b and 4b, and transfer power by frictional engagement with the input disks 3a and 4a and the output disks 3b and 4b. I do.

  A cylinder 7 is concentrically arranged inside the oil passage 1a of the main shaft 1. As shown in FIG. 3, an external perspective view of the cylindrical body 7 divides the oil passage 1a into an inner side and an outer side to form two lubricating oil feeding paths 8, 9 (see FIG. 2). Further, 10 (10a to 10d) is an oil hole provided in the shaft end portion of the input shaft 2. This oil hole 10 (10a to 10d) is an oil hole through which the lubricating oil supplied through the internal passage 2a is ejected to the outer surface, and the lubricating oil is pivoted at the inlet side opening 1b of the main shaft 1 by the rotation of the input shaft 2. Swirl around the core L to form a vortex.

The oil holes 10 (10 a to 10 d) is as shown in Figure 4 to the AA cross-section (cross section perpendicular) 2, an inner opening end 10a ₁ ~10d ₁ which opens in the direction in contact with the side wall of the inner passage 2a of the input shaft 2 The inner opening ends 10a _{1 to} 10d ₁ are connected to each other through a straight passage, and the input shaft 2 has outer opening ends 10a _{2 to} 10d ₂ that open in the rotating direction M, and are arranged at intervals around them. The shaft 2 is developed and has an equal inclination (inclination angle θ) with respect to the axis L as shown in FIG.

  Further, reference numeral 11 in the figure indicates a pipe body (see FIGS. 2 and 3) that connects the lubricating oil supply path 8 located on the inside and the friction engagement surface (see FIGS. 2 and 3), and 12 indicates the supply of lubricating oil to the internal passage of the input shaft 2. It is an oil hole. The oil hole 12 is composed of a plurality of oil holes 10 (10a to 10d) provided in the shaft end portion and arranged around the oil hole 10, and the lubricating oil in the internal passage 2a is swung around the shaft core L. Thus, a vortex flow (in the same direction as the vortex flow formed in the entrance-side opening 1b) is formed.

  The toroidal-type continuously variable transmission configured as described above is a hydraulic pressure in which the lubricating oil stored in the oil pan is sucked and discharged through the strainer by the oil pump P (see FIG. 1) and adjusted to a predetermined pressure by the control valve. The lubricating oil regulated by the control valve is passed through the oil passage provided in the transmission case and the oil pump cover to the input shaft 2 forming one of the lubricating oil supply paths. Are sent.

  The lubricating oil introduced into the internal passage of the input shaft 2 through the oil hole 12 flows toward the end of the shaft while spirally swirling through the oil hole 12, and the outer surface through the oil hole 10 (10a to 10d). The lubricating oil that is ejected flows through the oil holes 10 (10a to 10d) so as to vortex along the circumferential direction on the inner wall of the inlet side opening 1b of the main shaft 1 as well.

  In the situation where the lubricating oil flows while forming a vortex as described above, even if the foreign matter is mixed in the lubricating oil feeding process, the foreign matter is directed to the wall surface of the oil passage 1a by the centrifugal separation action. The lubricating oil that contains a lot of foreign matter passes through the outer lubricating oil supply path 9 and is fed to the rear of the transmission unit for lubrication of gears and bearings (see arrows in Fig. 1). The relatively clean lubricating oil passing through the central region of the oil passage 1a passes through the inner lubricating oil supply passage 8 and is supplied to the friction engagement surface through the oil hole 11 and the hole connected to the oil hole 11 (a right-angle hole). (See the arrow in FIG. 2), and the biting of foreign matter on the friction engagement surface is significantly reduced.

  As an example, the input shaft 2 is provided with a through-opening 2c at the end of the shaft, but a plug such as a plug is attached to the through-opening 2c and held in a closed state, or the through-opening 2c is provided from the beginning. If it is not provided, the lubricating oil can be ejected from only the oil hole 10, and the lubricating oil can be efficiently swirled.

The oil hole 10 provided in the shaft end portion of the input shaft 2 has inner opening ends 10a _{1 to} 10d ₁ that open in a direction in contact with the side wall of the internal passage of the input shaft 2, and the inner opening ends 10a _{1 to} 10d. ₁ having the outer opening ends 10a _{2 to} 10d ₂ connected straight to the input shaft 2 and rotating in the rotating direction is applied, but the rotating direction of the input shaft 2 and the direction of the oil hole 10 are matched. A turning force can be applied to the lubricating oil (if the outer opening ends 10a _{2 to} 10d ₂ are opened in a direction opposite to the direction in which the input shaft 2 rotates, the speed of the lubricating oil to be ejected and the rotational speed of the input shaft 2 are The swirl force is not applied to the lubricating oil and no vortex is formed.

  As long as the input shaft 2 is rotating regardless of whether the vehicle is running or stopped, the lubricating oil flows in a spiral manner in the oil passage 1a of the main shaft 1, so that clean lubricating oil with reduced contamination is frictionally engaged. Supplied to the surface. In particular, when the vehicle is traveling, the rotational speed of the input shaft 2 is increased, so that the lubricating oil flows at a higher speed (the centrifugal force increases), and the effect of separating the foreign matter is further enhanced.

  A plurality of oil holes 10 (10a to 10d) provided in the shaft end portion of the input shaft 2 are provided at intervals around the oil holes 10 and arranged with an equal inclination with respect to the shaft core of the shaft. Is particularly advantageous, whereby the flow of the lubricating oil ejected from each oil hole 10 (10a to 10d) is not hindered, and the force that forms the swirling flow of the lubricating oil can be further continued. .

The oil hole 12 that feeds the lubricating oil to the internal passage 2a of the input shaft 2 is an inner opening end that opens in a direction in contact with the side wall of the internal passage of the input shaft 2, similar to the oil hole 10 at the shaft end. has an outer open end which opens in the direction of rotation of the connection the input shaft 2 straight to the inner opening end, comprising a plurality arranged with equal inclination to the axis L ₁ of the input shaft 2 (Refer to FIG. 4), and in this way, a vortex flow in the same direction as the vortex flow formed in the inlet side opening 1b is formed in the internal passage of the input shaft 2, and the lubricating oil is ejected from the oil hole 10 Becomes smoother.

  The toroidal continuously variable transmission has a structure in which the contaminants contained in the lubricating oil are transferred to the outer region of the oil passage by centrifugal separation, and the relatively clean lubricating oil in the center is fed through the inner feeding passage. It can be applied not only to other transmissions.

  FIG. 6 is a view showing the main part of another embodiment of the toroidal continuously variable transmission according to the present invention.

With this example is inclined by an angle theta ₁ an internal passageway (those extending straight) 2a of the input shaft 2 with respect to the axial center L _1, entry end 2a of the inner passage 2a to indicate its BB section in Fig. 7 to just eccentric (Y-axis direction from the center of the outlet side end 2a ₂ of the inner passage 2a the axis L ₁ of the input shaft 2 e ₁ of the center with respect to the X-axis direction from the axis L ₁ of the input shaft 2 Te is of e ₁ only eccentricity) is allowed structure.

In the transmission having the above-described structure, the lubricating oil ejected from the outlet side end 2a ₂ of the internal passage 2a swirls around the axis L at the inlet side opening 1b of the main shaft 1 to form a vortex. Interstitial matter mixed in the lubricating oil moves toward the wall surface of the oil passage 1a due to the centrifugal separation action, and relatively clean oil is supplied to the friction engagement surface through the inner lubricating oil supply passage 8. Is done.

  The lubricating oil jetted from the oil hole of the input shaft is swirled around the shaft core to form a vortex, and only the lubricating oil that is kept relatively clean by the centrifugal separation action is supplied to the friction engagement surface. Thus, the degree of biting of the foreign matter on the friction engagement surface is reduced, and the life of the toroidal type continuously variable transmission can be extended.

It is the figure which showed embodiment of the toroidal type continuously variable transmission according to this invention by the cross section (vertical cross section). FIG. 2 is an enlarged view of a main part of the toroidal continuously variable transmission shown in FIG. It is an external appearance perspective view of a cylinder. FIG. 3 is a view showing an AA cross section of FIG. It is the figure which expanded and showed the input shaft. It is the figure which showed other embodiment of the toroidal type continuously variable transmission according to this invention. FIG. 7 is a view showing a BB cross section of FIG.

Explanation of symbols

1 Spindle
1a Oil passage
1b Inlet opening
2 Input shaft
2a Internal passage
3a, 4a input disc
3b, 4b output disc
5a, 5b Power roller
6a, 6b Power roller
7 cylinder
8 Inner lubricating oil supply path
9 Outer lubrication oil supply path
10 Oil hole
11 tube
12 Oil hole
L shaft core
L ₁ axis core

Claims (5)

A main shaft having an inlet side opening linked to the shaft end portion of the input shaft and having an oil passage extending along the shaft core, and rotatably supported by the main shaft and along the shaft core of the main shaft A movable input disk, an output disk that is rotatably supported by the main shaft facing the input disk, and a power roller that is disposed between the input and output disks and transfers power by frictional engagement. A toroidal-type continuously variable transmission with
Provided in the oil passage of the main shaft is a cylindrical body that is concentrically arranged to divide the oil passage into an inner side and an outer side to form two lubricating oil feeding paths,
At the shaft end of the input shaft, the lubricating oil supplied through the internal passage along with the rotation of the input shaft is jetted to the outer surface, and the lubricating oil is swung around the shaft center at the entrance side opening of the main shaft. Provide oil holes to form vortex flow,
A toroidal continuously variable transmission characterized in that an oil hole connected to a friction engagement surface of an input / output disk is formed in a lubricating oil feeding path located on the inner side of the two paths.   The oil hole provided in the shaft end portion of the input shaft is connected to an inner opening end that opens in a direction in contact with the side wall of the inner passage of the input shaft, and is connected to the inner opening end through a straight passage. 2. The toroidal continuously variable transmission according to claim 1, having an outer opening end that opens in a rotating direction.   3. The oil hole provided at the shaft end of the input shaft is provided with a plurality of intervals around the shaft, and is arranged with an equal inclination with respect to the shaft core of the shaft. Toroidal continuously variable transmission. The input shaft is provided with an oil hole that feeds the lubricating oil to the internal passage and swirls the fed lubricating oil to form a vortex.
The oil hole has an inner opening end that opens in a direction in contact with the side wall of the inner passage of the input shaft, and an outer opening end that is connected straight to the inner opening end and opens in the rotation direction of the input shaft. The toroidal continuously variable transmission according to any one of claims 1 to 3, wherein the toroidal continuously variable transmission is arranged in a plurality with an equal inclination with respect to the axis of the input shaft. A main shaft having an inlet side opening linked to the shaft end portion of the input shaft and having an oil passage extending along the shaft core, and rotatably supported by the main shaft and along the shaft core of the main shaft A movable input disk, an output disk that is rotatably supported by the main shaft facing the input disk, and a power roller that is disposed between the input and output disks and transfers power by frictional engagement. A toroidal-type continuously variable transmission with
Provided in the oil passage of the main shaft is a cylindrical body that is concentrically arranged to divide the oil passage into an inner side and an outer side to form two lubricating oil feeding paths,
The input shaft is provided with an internal passage that is inclined with respect to the shaft center of the shaft, and the input side end and the output side end are eccentric to the shaft core,
A toroidal continuously variable transmission characterized in that an oil hole connected to a friction engagement surface of an input / output disk is formed in a lubricating oil feeding path located on the inner side of the two paths.

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