JP2002081528A - Gear supporting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gear supporting structure capable of achieving light weight and favorable lubricity of each full type needle roller bearing while forming a structure of inserting a small-diameter and large-width spacer between the needle roller bearings in a structure of supporting small-diameter and large- width gears through the needle roller bearings to be relatively rotatable to a shaft. SOLUTION: As the spacer 5 to be inserted between the plural lines of the full type needle roller bearings 3 and 4, a plate member with both end parts butted and wound into a cylindrical form is used. A window part 5a for reducing weight, bent parts 5c for improving fluidity of lubricating oil, and lubricity of the needle roller bearings 3 and 4 on both sides, etc., can thus be easily processed by means of a press or the like in the state of the plate member before winding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear supporting structure, and more particularly, to a structure for supporting a gear so as to be rotatable relative to a shaft via a double row of needle roller bearings. The present invention relates to a support structure suitable for supporting a small-diameter and wide gear such as a pinion gear in a planetary gear section of a device.

[0002]

2. Description of the Related Art Generally, a pinion gear used in a planetary gear mechanism of an automatic transmission of an automobile is supported rotatably with respect to an axis. When a full roller needle roller bearing is used as the support structure, since the pinion gear is relatively wide, the needle roller bearing has a longer roller length than its roller diameter, which causes skew and seizure problems. .

[0003] Therefore, in this type of pinion gear, a double-row full roller needle roller bearing is interposed between the shaft and the shaft.
A structure in which a spacer is disposed between each full roller needle roller bearing is mainly employed. As this spacer,
2. Description of the Related Art Conventionally, a washer having a plate material punched into a disk shape is generally used.

[0004]

In recent years, there has been a case where a lavinio type is used as a planetary gear section due to a demand for downsizing of an automatic transmission. In this lavinio type planetary gear mechanism, a cross section is shown in FIG. As illustrated, a small and extremely wide pinion gear 52 is used. Therefore, when the gear 52 is supported on the shaft 51 via a double row full roller needle roller bearing in order to rotatably support such a small and wide gear, the roller length of each bearing is reduced. If the length is increased, skew may still occur even in a double row. Therefore, as shown in the drawing, the rollers 53a, 54a of the full roller needle roller bearings 53, 54 are shown.
It is necessary to arrange the spacer in the long cylindrical region shown by A in the figure without making the length too long, and the spacer must be small in diameter and wide (long).

[0005] As a method of manufacturing such a small-diameter and wide spacer, a method of cutting a pipe-like material or a method of drawing a plate-like material into a tubular shape by drawing is conceivable.
However, in the method of obtaining a spacer by simply cutting a pipe-shaped material, a region A, which is a long cylindrical space between each of the rollers 53a, 54a of the two needle roller bearings 53, 54, is formed into a cylindrical spacer. Not only increases the weight, but also makes it difficult for the lubricating oil supplied to the region A to flow through the lubricating oil passage 51a formed in the shaft 51. Therefore, even if the thickness of the spacer is reduced to reduce the weight, it is difficult to perform the punching process because the diameter is small and the thickness cannot be easily reduced. Also, shaft 5
1 through the lubricating oil passage 51a.
In order to supply the lubricating oil to the lubricating oils 3 and 54, and to improve the flow of the lubricating oil, if the cross-sectional shape of the spacer is to be made into a shape that facilitates the flow of the oil, the outer peripheral side can be easily shaved. Although it can be formed into a surface shape, it is extremely difficult to process because the inner peripheral side has a small diameter.

On the other hand, when a plate-shaped material is formed into a tubular shape by drawing, if the width (length) is too large with respect to the diameter, it is difficult to form the material itself. Since the diameter is small as in the case of using a pipe-shaped material, it is difficult to perform punching and the like, and even if it is attempted to improve the lubricity, such forming is impossible in the drawing process. Yes, additional processing such as roll forming is required after squeezing, and processing of the inner peripheral shape is extremely difficult in the same manner as described above.

The present invention has been made in view of such circumstances, and a wide gear such as a pinion gear of a planetary gear portion of a lavinio type is supported between these two so as to be rotatable relative to an axis. In a gear support structure in which double row full roller needle roller bearings are interposed, it is possible to reduce the weight and improve the lubricity of each needle roller bearing while using a small diameter and wide spacer. The purpose is to provide a gear support structure.

[0008]

In order to achieve the above object, a gear supporting structure of the present invention supports a gear so as to be rotatable relative to a shaft via a double row full roller needle roller bearing. In the gear supporting structure, a spacer formed by forming a plate-like material into a cylindrical shape so that both end portions thereof abut each other and welding the butted portions to each other is provided between the above-described full-roller needle roller bearings. It is characterized by being interposed (claim 1).

According to the first aspect of the present invention, the spacer interposed between the two full-roller needle roller bearings is formed by winding a plate-like material into a cylindrical shape. By performing any pre-processing on the plate material of
Any shape that can easily achieve weight reduction and improve lubricity can be used.

That is, as a specific spacer for weight reduction, if a window portion is formed by punching a plate-like material before winding forming as in the invention according to claim 2, a small-diameter and wide-width member can be obtained. The spacer is a cylindrical spacer, and the weight is reduced by the window.

Further, as a specific spacer for improving the lubricating oil flow and improving the lubricity of each full roller needle roller bearing, the plate before winding forming may be used. By bending the shaped member, a small-diameter and wide cylindrical spacer having a bent portion along the circumferential direction can be obtained.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is an external perspective view of the spacer 5.

Double-row full roller needle roller bearings 3 and 4 are inserted between the shaft 1 and the gear 2, and a cylindrical spacer 5 is provided between the two full roller needle roller bearings 3 and 4. Is interposed. The spacer 5 is formed with a plurality of windows 5a penetrating in the plate thickness direction, and the column 5b located between the windows 5a has two bent portions 5c in the longitudinal direction. Each pillar portion 5b is formed so that the center portion sandwiched between the two bent portions 5c projects outward in the circumferential direction more uniformly than both outer end portions thereof. It has become.

The shaft 1 is formed with a lubricating oil passage 1a passing through the center thereof and near the center of the spacer 5 in the axial direction and opening to the outer periphery of the shaft 1. The lubricating oil is supplied to the roller needle roller bearings 3 and 4.

The spacer 5 is manufactured by winding a plate-shaped material, and the manufacturing procedure is as shown in FIG.
That is, a plate-shaped material 51 as shown in FIG.
A plurality of windows 5a are formed by punching press forming as shown in FIG. 6B, and two bends 5 are formed in each column 5b simultaneously with or after the punching step.
Form c. Next, both ends thereof, that is, a portion indicated by A1 and a portion indicated by B1 in FIG. 3B, and a portion indicated by A2 and a portion indicated by B2 are cylindrically wound so as to abut each other. By molding and joining the butted portions A1 and B1 and A2 and B2 to each other by welding, a cylindrical spacer 5 as shown in FIG. 2 is obtained.

According to the above-described embodiment of the present invention, the plurality of windows 5a are formed in the cylindrical spacer 5 having a small diameter and a wide width, so that the weight is small and the space between the windows 5a is small. Since each column portion 5b is formed with two bent portions 5c each having a central portion protruding outward, the lubricating oil supplied through the lubricating oil passage 1a of the shaft 1 can be easily circulated. It flows in the direction and in the axial direction and spreads over each full complement needle roller bearing 3,4.

The window 5a and the bent portion 5c described above.
Can be easily formed by a press or the like before winding the plate-shaped material 51, so that it can be manufactured at low cost without using a special process.

Here, in the present invention, the shape of the spacer 5 for improving the flow of the lubricating oil is not limited to the above-described example, but may be an appropriate shape according to the position and form of the lubricating oil passage. As a matter of course, for example, as shown in the sectional view of the main part in FIG. 4, deformation such as forming two projecting portions 5d in each column portion 5b between the window portions 5a is possible.

In the present invention, the window portion 5a is not always required to be formed unless a light weight is required, and lubricating oil is not supplied through an oil passage formed in the shaft 1. However, when lubricating oil is supplied by another supply method, it is not always necessary to provide the bent portion 5c, the protruding portion 5d, and the like.

[0020]

As described above, according to the present invention, each full-roller needle is provided in a gear supporting structure in which a gear is rotatably supported on a shaft via a double-row full-roller needle roller bearing. As a spacer to be inserted between the roller bearings, a plate-shaped material wound into a cylindrical shape and the butted portion is welded is used. When a wide gear is supported rotatably with respect to the shaft, the length of the needle roller must be shortened and a small-diameter, wide spacer must be used to prevent skew and seizure of the needle roller bearing. Even when there is, before winding the plate-shaped material into a cylindrical spacer, it is possible to easily form a window portion by performing a punching process on the plate-shaped material to achieve weight reduction, Also,
Similarly, the sheet material before winding can be easily processed into a shape in which lubricating oil can easily flow by press molding, etc.
It is possible to obtain an inexpensive gear supporting structure in which the needle roller bearings on both sides are well lubricated.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is an external perspective view of a spacer 5 in the embodiment of FIG.

FIG. 3 is an explanatory diagram of a manufacturing procedure of the spacer 5 used in the embodiment of the present invention.

FIG. 4 is a sectional view of a main part of a spacer 5 that can be used in another embodiment of the present invention.

FIG. 5 is a cross-sectional view showing an example of a pinion gear support structure of a lavinio type planetary gear mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 shaft 1a Lubricating oil path 2 Gears 3, 4 Full-roller needle roller bearing 5 Spacer 5a Window 5b Column 5c Bend 5d Projection 51 Plate-shaped material

Claims (3)

[Claims] 1. A gear supporting structure in which a gear is rotatably supported relative to a shaft via a double-row full-roller needle roller bearing. A gear supporting structure, comprising a plate-shaped material wound in a cylindrical shape such that both ends thereof abut against each other, and a spacer formed by welding the butted portions to each other. 2. The gear supporting structure according to claim 1, wherein a window formed by previously punching out the plate material is formed in the spacer. 3. The gear supporting structure according to claim 1, wherein the spacer has a circumferentially bent portion formed by bending the plate material in advance.