JP2023176088A - Pinion and method of manufacturing pinion - Google Patents

Abstract

To further improve oil supply capacity with a pinion 1 of pin roller type.SOLUTION: A pinion 1 comprises a plurality of columnar-shaped pin rollers 3, and is engaged with a rack 2 with the pin rollers 3 as tooth tips. The pinion 1 also comprises a support 4 and an oil feeder 5. The support 4 is provided in a bobbin shape having a flank part 7 and two flange parts 8A, 8B, and supports the two flange parts 8A, 8B so that the plurality of pin rollers 3 are arranged in parallel with each other and in a cylindrical shape around the flank part 7. The oil feeder 5 is composed of an oil-impregnated resin, and supplies its oil to the pin rollers 3 by making contact with the pin rollers 3 from an inner circumferential side so as to exert a force to energize the pin rollers to an outer circumferential side on the pin rollers 3. Thus, oil supply capacity can be further improved with the pinion 1 of pin roller type.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to a pin roller type pinion.

BACKGROUND ART Conventionally, for example, in a rack and pinion type driving force transmission device, a so-called pin roller type pinion is sometimes employed for the purpose of preventing backlash.
By the way, in a driving force transmission device using such a pin roller type pinion, in order to smoothly mesh the pin roller with the teeth of other gears, it is necessary to supply oil to the surfaces of the teeth. Therefore, in order to avoid the trouble of manually applying oil directly to the teeth, a configuration has been disclosed in which the following oil supply section is attached to the pinion to supply oil to the pin roller (for example, Patent Documents 1 and 2). reference.).

The oil supply portions of Patent Documents 1 and 2 include an oil-impregnated resin and a plurality of coil springs, which will be described below. That is, the oil-impregnated resin has a cylindrical surface having a radius substantially the same as the revolution radius of the outermost peripheral portion of the pin roller when the pinion rotates. Further, the coil spring urges the oil-impregnated resin so that the outermost peripheral portion of the pin roller slides on the cylindrical surface as the pinion rotates. With such a configuration, the pin roller is supplied with the oil of the oil-containing resin by coming into contact with the cylindrical surface of the oil-containing resin. When the lubricated pin roller meshes with the teeth of other gears, the other gears are also lubricated.

Furthermore, according to the oil supply section of Patent Document 2, the plurality of coil springs are perpendicular to two directions: the axial direction of rotation of the pinion, and the direction of the tangent to the circle drawn when the outermost peripheral part of the pin roller revolves. Forces the oleoresin in the direction.
Thereby, it is possible to suppress a decrease in the oil supply capacity due to wear of the cylindrical surface, and it is also possible to easily restore the oil supply capacity.
However, in fields where pin roller type pinions are used, further improvements in durability and quietness are required, and further improvements in oil supply capacity are required.

Japanese Patent Application Publication No. 2013-19435 Patent No. 7001984

An object of the present disclosure is to further improve the oil supply capability of a pin roller type pinion.

The pinion of the present disclosure includes a plurality of cylindrical pin rollers, each of which meshes with another gear with each pin roller serving as a tooth tip. Further, the pinion includes the following support body and oil supply body. First, the support body is provided in the shape of a bobbin having a body part and two flange parts, and a plurality of pin rollers are supported by the two flange parts so as to be lined up in parallel and cylindrical around the body part. Next, the oil supply body is made of an oil-impregnating material and supplies its own oil to the pin roller by contacting the pin roller from the inner circumference side so as to exert a force urging the pin roller toward the outer circumference side.
Thereby, the pinion of the present disclosure can potentially solve the problem of further improving the lubricating ability in a pin roller type pinion.

It is a perspective view partially showing the inside of a pinion (Example 1). FIG. 2 is a cross-sectional view showing a pinion meshing with a rack (Example 1). FIG. 2 is a cross-sectional view showing a pinion meshing with a rack (Example 1). FIG. 3 is an explanatory diagram showing how a circular hole is provided in an intermediate body (Example 1). FIG. 2 is an explanatory diagram showing how parts of a refueling body are assembled to a support body (Example 1). It is a partial perspective view which shows a part of oil supply body (Example 2). It is an explanatory view showing how two materials are screwed together with a non-dividable oil supply body in between (Example 3). It is an explanatory view showing how a circular hole is provided in an intermediate body (Example 3). It is a sectional view showing the inside of a pinion (modification). It is a sectional view showing the inside of a pinion (modification). It is an explanatory view showing contact between an oil supply body and a pin roller (modification). It is an explanatory view showing how two materials are screwed together (modified example). It is an explanatory view showing how a circular hole is provided in an intermediate body (modification example). It is an explanatory view showing how a support body is decomposed into two materials after circular holes are provided (modification example). It is an explanatory view showing how two materials are again screwed together with a non-dividable oil supply body in between (modified example).

Modes for carrying out the present disclosure will be explained in detail with reference to the following examples.

[Configuration of Example 1]
The pinion 1 of Example 1 will be explained using FIGS. 1 to 5.
Here, the pinion 1 is meshed with, for example, a rack 2 to constitute a rack and pinion type driving force transmission device. The driving force transmission device, for example, rotates the pinion 1 to cause the pinion 1 to advance along the rack 2 while meshing the teeth of the pinion 1 with the teeth of the rack 2. Note that the teeth of the rack 2 have a profile that follows a predetermined cycloid curve, for example.
The pinion 1 will be explained in detail below.

The pinion 1 includes a plurality of cylindrical metal pin rollers 3, each of which meshes with other gears with each pin roller 3 as a tooth tip, and includes a support 4 and an oil supply body 5 as described below.
First, the support body 4 is provided in a bobbin shape having a body portion 7 and two flange portions 8A and 8B. The body 7 has, for example, a cylindrical shape, and the central axis of the body 7 serves as the rotation axis of the pinion 1 (hereinafter, the direction of the rotation axis of the pinion 1 may be referred to as the axial direction). Next, the flange parts 8A and 8B have substantially the same disk shape, and support a plurality of pin rollers 3 around the body part 7 so as to be arranged in a cylindrical shape parallel to the rotation axis of the pinion 1.

Here, the flange portions 8A and 8B support one end and the other end of the pin roller 3 in the axial direction, respectively. That is, each of the flange portions 8A and 8B has the same number of circular holes 9 as the number of pin rollers 3 at equal angular intervals for accommodating one and the other end of the pin roller 3 in the axial direction.

Further, the circular hole 9 of the flange portion 8A and the circular hole 9 of the flange portion 8B face each other, and each pin roller 3 is assembled so as to bridge between the flange portions 8A and 8B. Furthermore, a bottomed cylindrical housing 10 is attached to the circular hole 9, and a bearing (not shown) is housed in the housing 10. and are rotatably supported within each housing 10.

Next, the oil supply body 5 is made of, for example, an oil-impregnated resin, and contacts the pin roller 3 from the inner circumferential side so as to exert a force urging the pin roller 3 toward the outer circumferential side, thereby transferring its own oil to the pin roller 3. refuel.
Further, the oil supply body 5 has, for example, the following specific shape. That is, the oil supply body 5 is a uniquely shaped cylindrical body having a through hole 12 having approximately the same diameter as the body 7, and the same number of convex portions 13 as the pin rollers 3 protrude radially toward the outer periphery. The oil supply body 5 is assembled between the body 7 and the pin roller 3, is supported by the body 7 on the inner circumferential surface of the through hole 12, and is attached to the pin roller 3 on the inner circumferential surface of the convex portion 13. It is touching from the side.

Here, the convex portion 13 extends in parallel to the axial direction and is wide in the circumferential direction, and the tip side has a cylindrical surface 14 that has approximately the same diameter as the diameter of the pin roller 3 and is recessed toward the inner circumferential side. has. The cylindrical surface 14 is in contact with the cylindrical surface of the pin roller 3 from the inner peripheral side. Thereby, the cylindrical surface 14 functions as an oil supply surface that supplies oil to the pin roller 3.
Further, two convex portions 13 adjacent to each other in the circumferential direction form a concave portion 15 into which the teeth of the rack 2 fit.

Furthermore, the area of the side surface of the convex portion 13 that is close to the cylindrical surface 14 is provided in a shape that follows the tooth surface of the rack 2 (see FIG. 2). The inner bottom portion of the recess 15 forms a connecting portion 16 that connects two circumferentially adjacent protrusions 13.
Note that the oil supply body 5 of Example 1 is constructed by combining two parts 5A and 5B that are divided into two parts so as to have two-fold symmetry with respect to a plane including the central axis of the oil supply body 5 (see FIG. 5). ).

[Production method of Example 1]
A method for manufacturing the pinion 1 of Example 1 will be explained.
First, according to the manufacturing method of Example 1, an intermediate X, which is a material for the support 4, is provided. Here, the intermediate body X has a bobbin shape that integrally has portions corresponding to the body portion 7 and the flange portions 8A and 8B (hereinafter, portions of the intermediate body X that correspond to the flange portions 8A and 8B, respectively). are sometimes referred to as the flange portions XA and XB).
Further, in the manufacturing method of Example 1, the intermediate body X is provided by so-called "cutting out". For example, intermediate body X is provided by removing unnecessary portions from a cylindrical material larger than intermediate body X.

Then, a hole-drilling tool 18 such as a drill is passed through the flange portions XA and XB in the axial direction to form a circular hole 9 in both the flange portions XA and XB at once (see FIG. 4).
Subsequently, the two parts 5A and 5B are assembled around the body 7 to form the oil supply body 5 (see FIG. 5). Thereafter, bearings and housings 10 are attached to both ends of the pin roller 3 and assembled to the flanges 8A and 8B.

[Effects of Example 1]
The pinion 1 of the first embodiment includes a plurality of cylindrical pin rollers 3, and meshes with the rack 2 with each pin roller 3 serving as a tooth tip. Further, the pinion 1 includes a support body 4 and an oil supply body 5 as described below. First, the support body 4 is provided in a bobbin shape having a body part 7 and two flange parts 8A, 8B, and a plurality of pin rollers 3 are arranged around the body part 7 in parallel and cylindrical shape. It is supported by the flange parts 8A and 8B.

Next, the oil supply body 5 is made of oil-impregnated resin, and supplies its own oil to the pin roller 3 by contacting the pin roller 3 from the inner circumference side so as to exert a force urging the pin roller 3 toward the outer circumference side. do.
Thereby, according to the pinion 1 of Example 1, it is possible to potentially solve the problem of further improving the refueling ability.

That is, according to the pinion 1, the oil supply body 5 contacts the pin roller 3 from the inner circumferential side so as to exert a biasing force toward the outer circumferential side, and this contact from the inner circumferential side supplies oil to the pin roller 3. supply Therefore, regardless of the direction in which the rack 2 is present, the oil supply body 5 can, for example, simultaneously contact and supply oil to the pin rollers 3 present in all directions from the inner peripheral side.

Here, in the conventional pinions shown in Patent Documents 1 and 2, the oil supply body contacts the pin roller from the outer circumferential side so as to exert a force urging the pin roller toward the inner circumferential side. In this case, it is necessary to avoid three-dimensional interference between the rack and the oil supply body, so the oil supply body cannot be placed in the same direction as the rack. Therefore, the pin roller cannot be oiled in the direction where the rack is present.

On the other hand, according to the pinion 1 of the first embodiment, the oil supply body 5 can be present in any direction to supply oil to the pin roller 3, regardless of the position of the rack 2. Therefore, for example, by bringing the oil supply body 5 into contact with all the pin rollers 3 from the inner peripheral side, all the pin rollers 3 can be oiled at the same time, so that the oil supply capacity can be increased.

The oil supply body 5 also has a convex portion 13 that contacts the pin roller 3 from the inner peripheral side, and the two circumferentially adjacent convex portions 13 form a concave portion 15 into which the teeth of the rack 2 fit.
Thereby, even if the oil supply body 5 is disposed on the inner peripheral side of the pin roller 3, the pin roller 3 and the rack 2 can be reliably engaged.

Moreover, the oil supply body 5 has the following connection part 16. That is, the connecting portion 16 connects the two circumferentially adjacent protrusions 13 and forms the bottom of the inner circumferential side of the recess 15 .
As a result, the plurality of convex portions 13 are integrated into one piece, so that the number of parts can be reduced and the assembly of the oil supply body 5 can be simplified.

Furthermore, the oil supply body 5 has parts 5A and 5B that are divided into two in the circumferential direction around the body 7. According to the method for manufacturing the pinion 1, after the parts 5A and 5B are assembled around the body part 7, the plurality of pin rollers 3 are assembled to the flange parts 8A and 8B.
Thereby, when the bobbin-shaped intermediate body X, which allows easy axis alignment of the pin roller 3, is used as the material for the support body 4, the oil supply body 5 can be reliably assembled to the inner peripheral side of the pin roller 3.

Here, the pinion 1 is manufactured in the following manner from the viewpoint of ease of axis alignment of the pin roller 3 with respect to the two flange portions 8A and 8B.
That is, a bobbin-shaped intermediate body X is provided in advance, and in the intermediate body X, circular holes 9 for supporting the pin roller 3 are provided at once in the flange portions XA and XB, and then the pin roller 3 is assembled. Therefore, before assembling the pin roller 3 to the support body 4, it is necessary to assemble the oil supply body 5 in the area sandwiched between the flanges 8A and 8B.

Therefore, the oil supply body 5 is configured, for example, by combining parts 5A and 5B that are divided into two parts in the circumferential direction. Before assembling the pin roller 3 to the support body 4, parts 5A and 5B are assembled around the body 7 to form the oil supply body 5.
Thereby, the oil supply body 5 can be reliably assembled to the inner peripheral side of the pin roller 3.

[Example 2]
According to the pinion 1 of Example 2, the oil supply body 5 is an annular body having an abutment 20 that divides in the circumferential direction (see FIG. 6). In the manufacturing method of the second embodiment, after the abutment 20 is widened and the oil supply body 5 is fitted around the outer periphery of the body 7, the plurality of pin rollers 3 are assembled to the flange parts 8A and 8B.
Thereby, as in the first embodiment, the oil supply body 5 can be reliably assembled to the inner peripheral side of the pin roller 3.

[Example 3]
According to the pinion 1 of Example 3, the oil supply body 5 is not divided into a plurality of parts in the circumferential direction, and does not have the abutment 20, but is provided as an integral body (hereinafter, in the circumferential direction A refueling body 5 that is not divided into a plurality of parts, does not have an abutment 20, and is provided as an integral body may be referred to as a "non-divided refueling body 5.").

Further, according to the manufacturing method of Example 3, the intermediate body X is provided by screwing together the following materials X1 and X2 (see FIG. 7). Here, the material X1 is made up of the body part 7 of the support body 4 and a part corresponding to one flange part 8A (the part corresponding to the flange part XA of the intermediate body X), and the material X2 is made up of the part corresponding to the other flange part 8B. It consists of a corresponding portion (a portion corresponding to the flange portion XB of the intermediate body X).

In Example 3, the materials X1 and X2 are screwed together with the non-dividable oil supply body 5 sandwiched between the materials X1 and X2.
Thereafter, similarly to Example 1, the drilling tool 18 is axially penetrated through the portions corresponding to the flange portions XA and XB to form circular holes 9 in both the flange portions XA and XB at once (see FIG. 8). ).

At this time, the drilling tool 18 is operated so as to pass near the tip of the convex portion 13, for example. For this reason, the drilling tool 18 forms the circular holes 9 in both the flange portions XA and XB at the same time while slightly cutting the tip of the convex portion 13. Thereafter, bearings and housings 10 are attached to both ends of the pin roller 3 and assembled to the flanges 8A and 8B.

[Modified example]
Various modifications can be made to the present invention without departing from the gist thereof.
For example, according to the pinion 1 of Examples 1 to 3, the oil supply body 5 had the convex portion 13 and the connecting portion 16 as an integrated body, but the aspect of the oil supply body 5 is not limited to such an aspect.
For example, the oil supply body 5 may be provided without the connection portion 16 (see FIG. 9). That is, the oil supply body 5 is provided with only the convex portions 13, the body portion 7 is provided with a fitting hole into which the fitting allowance of each of the convex portions 13 is fitted, and the fitting allowance is fitted into the fitting hole to constitute the oil supply body 5. It's okay.

Further, according to the pinion 1 of Examples 1 to 3, the cylindrical surface 14 having substantially the same diameter as the pin roller 3 functions as the oil supply surface. They may be flat surfaces 22A, 22B. That is, the two planes 22A and 22B forming the oil supply surface may be provided so that they form an obtuse angle in a cross section perpendicular to the axial direction, and the straight lines formed by intersecting each other are parallel to the axial direction ( (See Figure 10.)
Further, according to the pinion 1 of Examples 1 and 2, the oil supply body 5 was in contact with the pin roller 3 due to its own elasticity, but the oil supply body 5 may be brought into contact with the pin roller 3 using a spring, for example.

Further, according to the pinion 1 of Examples 1 to 3, the convex portion 13 has a long shape in the axial direction, and covers the circumferential surface of the pin roller 3 over the entire axial range of the region sandwiched between the flange portions 8A and 8B. However, the protrusion 13 may be provided in the following shape, for example. In other words, the oil supply body 5 may be provided in a shape that protrudes toward the outer circumference around the entire circumference (see FIG. 11), and may be brought into contact with the pin roller 3 at one point in the axial direction on the outer circumference surface to supply oil.

Further, according to the pinion 1 of the first embodiment, the oil supply body 5 is constructed by combining two parts 5A and 5B that are divided into two parts so as to have two-fold symmetry in a plane including the central axis of the oil supply body 5. However, it is not limited to this embodiment. For example, the oil supply body 5 may be configured by combining three parts divided into three parts so as to have three-fold symmetry, and further, a plurality of parts divided in the circumferential direction in a manner not having rotational symmetry. It may be constructed by combining parts.

Furthermore, according to the manufacturing method of the pinion 1 of Example 3, the non-divided type oil supply body 5 was assembled to the intermediate body X before providing the circular hole 9, but when the non-divided type oil supply body 5 is used Alternatively, the pinion 1 may be manufactured as follows.
That is, without sandwiching the oil supply body 5 between the materials X1 and X2, the materials X1 and X2 are screwed together to form an intermediate body X, and the circular holes 9 are drilled in both the flange portions XA and XB at the same time using the drilling tool 18. (See Figures 12 and 13.) After that, the screw fastening is once released and the materials X1 and X2 are disassembled, the non-dividable oil supply body 5 is sandwiched between the materials X1 and X2, and the materials X1 and X2 are screwed together again (Fig. 14 and (See Figure 15.)

In this modification, after the circular hole 9 is provided, the screw fastening of the support body 5 is once released and the support body 5 is disassembled into materials X1 and X2. Therefore, when screwing the materials X1 and X2 together again, aligning the axes of the circular holes 9 in each of the materials X1 and X2, or when releasing the screw tightening of the support 5, Measures to prevent axis misalignment may be taken.

Further, according to the pinion 1 of Examples 1 to 3, the oil supply body 5 was made of oil-retaining resin, but other materials may be used as the oil supply body 5 as long as they are oil-retaining materials. For example, an oil-impregnating metal may be used as the oil supply body 5.
Furthermore, according to the pinion 1 of Examples 1 to 3, the rack and pinion type driving force transmission device was configured in combination with the rack 2. A driving force transmission device other than a rack-and-pinion type may be configured by meshing with a gear (gear).

1 Pinion 2 Rack 3 Pin roller 4 Support body 5 Oil supply body 7 Body part 8A, 8B Flange part

Claims (5)

In a pinion that is equipped with a plurality of cylindrical pin rollers and meshes with other gears with each pin roller as a tooth tip,
a support body provided in the shape of a bobbin having a body part and two flange parts, and supporting the plurality of pin rollers by the two flange parts so as to be arranged in parallel and cylindrical around the body part;
Made of oil-bearing material,
A pinion comprising: an oil supply body that supplies its own oil to the pin roller by contacting the pin roller from the inner circumference side so as to exert a force urging the pin roller toward the outer circumference side. The pinion according to claim 1,
The oil supply body has a convex portion that comes into contact with the pin roller from an inner peripheral side,
A pinion characterized in that two circumferentially adjacent protrusions form a recess into which the teeth of the other gear fit. The pinion according to claim 2,
The pinion is characterized in that the oil supply body has a connecting portion that connects two circumferentially adjacent convex portions and forms a bottom on the inner circumferential side of the recessed portion. The method for manufacturing a pinion according to claim 3,
The oil supply body has parts divided into a plurality of parts in a circumferential direction around the body,
In the method for manufacturing the pinion,
A method for manufacturing a pinion, comprising assembling the plurality of parts around the body, and then assembling the plurality of pin rollers to the two flange parts. The method for manufacturing a pinion according to claim 3,
The oil supply body is an annular body having an abutment that divides in a circumferential direction around the body,
In the method for manufacturing the pinion,
A method for manufacturing a pinion, comprising expanding the abutment and fitting the annular body around the outer periphery of the body, and then assembling the plurality of pin rollers to the two flange parts.

Images