阅读说明：本技术 接头装置 (Joint device ) 是由 川下道宏 池口健布莱恩 桥本裕明 鬼形淳一郎 于 2018-06-13 设计创作，主要内容包括：本发明的接头装置具备：第一联接构件(24a),其在圆盘面上具有第一齿(30a)；第二联接构件(24b),其在圆盘面上具有第二齿(30b)；以及紧固构件(24c),其在中央部紧固第一联接构件(24a)与第二联接构件(24b)。将基准面(31)设为与圆盘面平行的表面。将齿面角度设为与第一联接构件(24a)的径向垂直的截面上的、第一齿(30a)与第二齿(30b)的啮合齿面(26a1)与基准面(31)的相交线上的点C处的、啮合齿面(26a1)的切线(26a2)与基准面(31)所成的锐角的角度。第一齿(30a)的齿面角度α、β沿着第一联接构件(24a)的径向而变化。(The joint device is provided with a first coupling member (24a) having first teeth (30a) on a disc surface, a second coupling member (24b) having second teeth (30b) on the disc surface, and a fastening member (24C) that fastens the first coupling member (24a) and the second coupling member (24b) at a central portion, and a reference surface (31) is a surface parallel to the disc surface, wherein a tooth surface angle is an acute angle formed by a tangent (26a2 a) of a tooth surface (26a1) and the reference surface (31) at a point C on a line of intersection between a tooth surface (26a1) of the first tooth (30a) and the second tooth (30b) and the reference surface (31) on a cross section perpendicular to the radial direction of the first coupling member (24a), and the tooth surface α, β of the first tooth (30a) changes along the radial direction of the first coupling member (24 a).)

1. A joint device is characterized by comprising:

a first coupling member having a disk shape and having a plurality of first teeth on a disk surface;

a second coupling member having a disk shape and having a plurality of second teeth on a disk surface thereof, the second teeth meshing with the first teeth of the first coupling member; and

a fastening member inserted through central portions of the first coupling member and the second coupling member to fasten the first coupling member and the second coupling member,

the first teeth extend in a radial direction of the first coupling member,

the second teeth extend in a radial direction of the second coupling member,

the reference surface is set to be a surface parallel to the disk surface,

if the tooth surface angle is set to an acute angle formed by a tangent to the engaging tooth surface of the first tooth and the second tooth at a point on an intersection line of the engaging tooth surface and the reference surface on the cross section perpendicular to the radial direction of the first coupling member and the reference surface,

the face angle of the first tooth varies along the radial direction of the first coupling member.

2. A joint arrangement according to claim 1,

the tooth surface angle of the first tooth increases from an inner peripheral portion toward an outer peripheral portion of the first coupling member along the radial direction of the first coupling member.

3. Joint arrangement according to claim 1 or 2,

the engaging tooth surface of the first coupling member and the engaging tooth surface of the second coupling member are curved surfaces.

4. A joint arrangement according to claim 3,

the shape of the engaging flank of the first tooth on the cross section is represented by a curve of formula (1), and in formula (1), a polar coordinate (r)_bAnd theta) represents the coordinate (x) on the cross section_bry，y_bry)，r_bIs a constant determined by the size of the first tooth, theta is a parameter,

[ formula 1]

5. A joint arrangement according to claim 3,

the shape of the engaging flank of the first tooth on the cross section is represented by a curve of formula (2), and in formula (2), a polar coordinate (r)_bAnd theta) denotes said sectionCoordinates on the surface (x)_inv，y_inv)，r_bIs a constant determined by the size of the first tooth, theta is a parameter,

[ formula 2]

Technical Field

The present invention relates to a joint device.

Background

A joint arrangement is used to connect two components, such as shafts for transmitting torque. As such a joint device, for example, a mouse tray is disclosed in patent document 1. The mouse tray is formed by combining two disk-shaped gears (face gears) each having a plurality of teeth arranged on a flat surface portion, one of the gears is a driven-side mouse tray, and the other gear is a driving-side mouse tray. The teeth of the driven side mouse chain wheel are meshed with the teeth of the driving side mouse chain wheel. The mouse tray is characterized in that when the driven side mouse tray and the driving side mouse tray are fastened, a large contact area of tooth surfaces can be ensured, so that excessive torque can be transmitted compactly, and the tooth height is reduced from the outer peripheral portion to the central portion, so that an automatic aligning effect can be obtained when fastening. For example, patent document 2 describes that a mouse ring can be used as a joint device for an impeller and a rotating shaft supporting the impeller in a rotor of a turbo compressor. In the rotor of the turbo compressor described in patent document 2, the impeller and the rotary shaft can be easily fastened only by applying a fastening force by the fastening bolt penetrating the rotation center of the impeller by the automatic aligning action of the mouse ring.

The mouse tray can be used, for example, in an actuator of a link mechanism for an internal combustion engine. Patent document 3 describes an example of an actuator of a link mechanism for an internal combustion engine.

Disclosure of Invention

Problems to be solved by the invention

Fig. 6A and 6B are cross-sectional views taken in the radial direction, showing the fastening portion of the mouse tray 24. Fig. 6A is a view showing a state before the driven-side mouse tray 24a and the driving-side mouse tray 24b are fastened by the bolts 24 c. Fig. 6B is a view showing a state after the driven-side mouse tray 24a and the driving-side mouse tray 24B are fastened by the bolts 24 c. A bolt 24c as a fastening member is inserted through the central portion of the mouse tray 24, that is, the central portions of the driven-side mouse tray 24a and the driving-side mouse tray 24 b.

As shown in fig. 6A, before the center portion of the mouse tray 24 is fastened with the bolt 24c, the tooth surface 24a1 of the driven-side mouse tray 24a and the tooth surface 24b1 of the driving-side mouse tray 24b are in contact with each other without a gap.

When the central portion of the mouse tray 24 is fastened by the bolt 24c at the time of assembling the mouse tray 24, uniform fastening force does not act on the tooth surfaces of the driven-side mouse tray 24a and the driving-side mouse tray 24b which are engaged with each other, and excessive fastening force acts on the inner peripheral portion in the vicinity of the bolt 24 c. As a result, friction force is generated due to high surface pressure in the inner peripheral portions of the driven-side mouse tray 24a and the driving-side mouse tray 24b, and relative sliding between the tooth surfaces (relative sliding between the tooth surfaces between the driven-side mouse tray 24a and the driving-side mouse tray 24b) which is a factor of fretting wear does not occur. However, since only a slight tightening force acts on the outer peripheral portions of the driven-side mouse tray 24a and the driving-side mouse tray 24b, the relative sliding of the tooth surfaces is likely to occur.

In the case where a high axial force is applied to the bolt 24c in order to improve the fastening ability of the mouse tray 24, an excessive compressive force is generated in the central portion of the mouse tray 24.

As shown in fig. 6B, when an excessive compression force is generated in the center portion of the mouse tray 24, the end portion of the inner circumferential portion where the relative sliding of the tooth surfaces does not occur functions as the rotation center, and the outer circumferential portion floats, so that the tooth surface 24a1 of the driven-side mouse tray 24a and the tooth surface 24B1 of the driving-side mouse tray 24B are separated from each other. Since these tooth surfaces are separated from each other in a circle based on the rotation center, the teeth of the drive-side mouse tray 24b are in contact with the teeth of the driven-side mouse tray 24a only at the inner peripheral portion, and the outer peripheral portion floats from the driven-side mouse tray 24 a. Since a gap is generated between the tooth surface 24a1 of the driven-side mouse tray 24a and the tooth surface 24b1 of the driving-side mouse tray 24b, no surface pressure is generated in the outer peripheral portion of the mouse tray 24, and no binding force due to friction is applied. As a result, when a torque load is applied, relative sliding occurs between the tooth surfaces of the driven-side mouse tray 24a and the driving-side mouse tray 24b, and damage to the tooth surfaces due to fretting wear becomes significant.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a joint device in which a relative slip amount generated between tooth surfaces of a driven-side mouse pad and a driving-side mouse pad at the time of a torque load can be reduced, and damage to the tooth surfaces due to fretting can be suppressed.

Means for solving the problems

The joint device of the present invention includes: a first coupling member having a disk shape and having a plurality of first teeth on a disk surface; a second coupling member having a disk shape and having a plurality of second teeth on a disk surface thereof, the second teeth meshing with the first teeth of the first coupling member; and a fastening member inserted through central portions of the first coupling member and the second coupling member to fasten the first coupling member and the second coupling member. The first teeth extend in a radial direction of the first coupling member. The second teeth extend in a radial direction of the second coupling member. The reference surface is a surface parallel to the disk surface. A tooth surface angle is set to an acute angle formed by a tangent to a meshing tooth surface of the first tooth and the second tooth and the reference surface at a point on an intersection line of the meshing tooth surface and the reference surface on a cross section perpendicular to the radial direction of the first coupling member. The tooth face angle of the first tooth varies along the radial direction of the first coupling member.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, it is possible to provide a joint device capable of reducing a relative slip amount generated between tooth surfaces of a driven-side mouse tray and a driving-side mouse tray due to a torque load in the mouse tray and suppressing damage of the tooth surfaces due to fretting wear.

Drawings

Fig. 1 is a schematic diagram of a link mechanism for an internal combustion engine provided with an actuator provided with a joint device of the present invention.

Fig. 2 is a sectional view of an actuator of a link mechanism for an internal combustion engine provided with the joint device according to embodiment 1.

Fig. 3 is an exploded view of the joint device (mouse tray) of example 1.

Fig. 4A is a perspective view of the driven-side mouse tray, and is a view showing an example of the tooth shape of the driven-side mouse tray.

Fig. 4B is a perspective view of the drive-side mouse tray, and is a view showing an example of the tooth profile of the drive-side mouse tray.

Fig. 5A is a schematic view showing the tooth profile of the teeth of the driven-side mouse tray in the conventional joint device.

Fig. 5B is a schematic view showing the tooth profile of the teeth of the drive-side mouse tray in the conventional joint device.

Fig. 5C is a schematic view showing the tooth profile of the teeth of the driven-side mouse tray in the joint device of example 1.

Fig. 5D is a schematic view showing the tooth profile of the teeth of the drive-side mouse tray in the joint device of example 1.

Fig. 6A is a cross-sectional view of a fastening portion of the mouse tray, taken along the radial direction, showing a state before the driven-side mouse tray and the driving-side mouse tray are fastened by bolts.

Fig. 6B is a cross-sectional view of a fastening portion of the mouse tray, taken along the radial direction, showing a state after the driven-side mouse tray and the driving-side mouse tray are fastened with bolts.

Fig. 7A is a view showing a tooth profile when the teeth of the driven-side mouse tray are engaged with the teeth of the driving-side mouse tray before the mouse tray is fastened with the bolts.

Fig. 7B is a view showing the tooth profile of the teeth of the driven-side mouse tray and the tooth profile of the teeth of the driving-side mouse tray after the mouse tray is fastened with the bolts.

Fig. 7C is a view showing the tooth shapes of the three cross-sections when the teeth of the driven-side mouse tray are engaged with the teeth of the driving-side mouse tray before the conventional mouse tray is fastened with the bolts.

Fig. 7D is a view showing the tooth shapes of three cross sections after the conventional mouse tray is fastened with bolts.

Fig. 7E is a view showing the tooth shapes in three cross sections when the teeth of the driven-side mouse tray are engaged with the teeth of the driving-side mouse tray before the mouse tray of example 1 is fastened with the bolts.

Fig. 7F is a view showing the tooth shapes on three cross sections after the mouse tray of example 1 is fastened with bolts.

Fig. 8A is a schematic view showing the tooth profile of the teeth of the driven-side mouse tray in the mouse tray of example 2.

Fig. 8B is a schematic view showing the tooth profile of the teeth of the drive-side mouse tray in the mouse tray of example 2.

Fig. 9A is a view showing a tooth meshing surface of the tooth profile of the driven-side mouse tray in example 2.

Fig. 9B is a view showing tooth tops of the tooth profiles shown in fig. 9A in example 2.

Fig. 10A is a schematic view showing the tooth profile of the teeth of the driven-side mouse tray in the mouse tray of example 3.

Fig. 10B is a schematic view showing the tooth profile of the teeth of the drive-side mouse tray in the mouse tray of example 3.

Fig. 11A is a view showing a tooth meshing surface of the tooth profile of the driven-side mouse tray in example 3.

Fig. 11B is a view showing tooth crest surfaces of the tooth profile shown in fig. 11A in example 3.

Fig. 12 is a graph showing the relative slippage obtained by numerical analysis when the tooth profile of the mouse tray is the conventional shape, the shape in example 2, and the shape in example 3.

Detailed Description

The joint device of the present invention can be used, for example, in a mouse tray provided in an actuator of a link mechanism for an internal combustion engine.

As described with reference to fig. 6A and 6B, in the mouse tray 24, due to a bolt axial force when the central portion is fastened with the bolt 24c at the time of assembly, a high surface pressure is applied to an inner peripheral portion (radially inside) near the central portion through which the bolt 24c is inserted between the driven-side mouse tray 24a and the driving-side mouse tray 24B, and a frictional force is generated. However, since no surface pressure is applied to the outer peripheral portion (radially outward), no constraining force due to friction is applied, and when a torque load is applied, relative sliding occurs between the tooth surfaces, and the tooth surfaces are damaged by fretting.

The joint device (mouse pad) of the present invention can reduce the relative sliding amount generated between the tooth surface outer peripheries of the driven side mouse pad 24a and the driving side mouse pad 24b by the axial force of the bolt 24c, and can suppress the damage of the tooth surface caused by fretting wear. Further, in the joint device of the present invention, the fastening force of the bolt 24c is distributed from the central portion (inner circumferential portion) to the outer circumferential portion by applying the surface pressure to the outer circumferential portion of the mouse tray 24 and reducing the surface pressure of the inner circumferential portion, whereby the axial force of the bolt 24c can be further increased and the fastening force of the bolt 24c can be further increased.

Hereinafter, a joint device (mouse tray) according to an embodiment of the present invention will be described.