Strain wave gear unit, gear transmission device, and valve timing changing device
A technology of wave gears and internal gears, which is applied to gear transmissions, transmissions, transmission parts, etc., and can solve the problems of large-scale devices, high costs, and increased manufacturing costs.
Active Publication Date: 2021-08-31
MIKUNI CORP
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- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
[0005] Therefore, if it is desired to integrally form the bottomed cylindrical internal gear defined by the cylindrical portion and the bottom wall portion by machining, the internal teeth cannot be formed over the entire width of the cylindrical portion, and the gap between the cylindrical portion and the bottom wall portion cannot be formed. A continuous corner region, resulting in a tooth-free region where no teeth or complete teeth are formed
[0006] In order to cope with the above situation, it is also possible to remove the tooth-free region by cutting it into a concave shape by cutting or the like, but this will lead to an increase in the processing workload and an increase in the manufacturing cost.
[0007] On the other hand, in order to avoid interference between the external teeth of the external gear and the area where the teeth are not formed, for example, a pressing member as disclosed in Patent Document 2 may be used to limit the movement in the thrust direction, but this will cause the external gear to move. Increase in size of the device in the width direction, complexity of the structure, increase in the number of components, increase in cost, etc.
Method used
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[0047] Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0048] Such as figure 1 as well as figure 2 As shown, the valve timing changing device M of one embodiment includes a phase changing unit that changes the relative rotational phase of the camshaft 2 and the sprocket 11a. Here, the camshaft 2 is along a direction around the axis S ( figure 1 R direction) rotation, including brim-shaped fitting part 2a, screw hole 2b, oil passage 2c, and fitting hole 2d of positioning pin P. The sprocket 11a rotates in one direction (R direction) around the axis S, and interlocks with the rotation of the crankshaft via a chain.
[0049] And, by appropriately driving and controlling the phase changing means by the electric motor, the opening and closing timing (valve timing) of the intake valve or the exhaust valve driven by the camshaft 2 is changed.
[0050] Such as Figure 3 to Figure 5As shown, the phase changing unit includes a ...
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The invention provides a strain wave gear unit, a gear transmission device, and a valve timing changing device. The strain wave gear unit includes: a bottomed cylindrical first internal gear (20) having internal teeth (23) formed on a cylindrical part (21) and a teeth-non-formed part (24) that protrudes farther inward than the tooth bottom of the internal teeth in a corner area (CA) where a bottom wall part (22) is integrally connected to the cylindrical part; a flexible cylindrical external gear (40) having external teeth (41) that mesh with the internal teeth of the first internal gear, an opposing part (43) opposing the teeth-non-formed part with a gap therebetween, and an end part (42a) opposing the bottom wall part so as to make contact therewith; a second internal gear (50) arranged adjacent to the first internal gear and having internal teeth (52) that mesh with the external teeth; and a rotation member (70) that causes the external gear to deform in an oval shape and causes the meshing position to move while partially meshing with the first internal gear and the second internal gear.
Description
technical field [0001] The present invention relates to a ring type (also called flat type) wave gear unit comprising an internal gear and a cylindrical external gear, in particular to a wave gear unit comprising a bottomed cylindrical internal gear and a gear transmission device And the valve timing changing device of the engine. Background technique [0002] As a conventional wave gear unit, there is known a wave gear transmission device comprising: two internal gears formed in a cylindrical shape; two plate-shaped members respectively fixing the two internal gears; The permanent external gear is formed in a cylindrical shape to mesh with two internal gears, and the wave generator deforms the external gear elliptically (for example, refer to Patent Document 1). [0003] In this device, a bottomed cylindrical (cup-shaped) internal gear including a cylindrical portion and a bottom wall is configured by fixing the cylindrical internal gear to a plate-shaped member functionin...
Claims
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IPC IPC(8): F16H1/32F01L1/356
CPCF01L1/356F16H57/0428F16H57/0424F16H49/001F16H2049/003F01L1/352F01L1/022F01L2810/02F01L2303/00F01L2303/01F01L2820/032F01L1/344F16H57/043
Inventor 实方雄平
Owner MIKUNI CORP