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Actuator

A technology for actuators and supporting shafts, which is applied in the direction of instruments, electric components, transmissions, etc., and can solve the problems of inner peripheral surface or shaft wear, surface pressure increase, etc.

Pending Publication Date: 2020-07-17
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the surface pressure at the contact portion increases, possibly promoting the wear of the inner peripheral surface of the center hole of the driven gear or the shaft

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0022] Such as figure 1 As shown, the actuator 10 is provided in an engine system including an internal combustion engine 11 as a power source for vehicle travel.

[0023] The engine 11 is provided with an intake passage 12 that guides intake air into cylinders of the engine 11 and an exhaust passage 13 that discharges exhaust gas generated in the cylinders into the atmosphere. In the middle portion of the intake passage 12, a compressor wheel 14a of an intake compressor 14 of a turbocharger 24 and a throttle valve 15 are disposed. The compressor wheel 14 a turbocharges intake air into the engine 11 . The throttle valve 15 changes the amount of intake air supplied to the engine 11 according to the position of an accelerator pedal (not shown) operated by a driver, for example.

[0024] In the middle portion of the exhaust passage 13, a turbine wheel 16a of an exhaust turbine 16 of a turbocharger 24 and a catalyst 17 for purifying exhaust gas are disposed. The turbine wheel 1...

no. 2 example

[0050] Such as Figure 8 As shown, in the second embodiment, the diameter d2 of the second metal shaft 61 in the axial center portion 61c inside both ends in the direction along the second metal shaft 61 is larger than that of the two end portions outside the center portion 61c diameter d1. The shaft hole 53 h of the second intermediate gear 53 has an inner diameter capable of receiving the center portion 61 c of the second metal shaft 61 . The second metal shaft 61 and the second intermediate gear 53 are not in contact with each other on both end sides in the direction of the second metal shaft 61 with respect to the central portion 61c, and form a substantially cylindrical space. This substantially cylindrical space serves as the wear powder holding portion 71 that holds the wear powder 80 and foreign matter at both ends of the shaft hole 53h. That is, the wear powder holding portion 71 is provided outside the outer circumference of the second metal shaft 61 at the axial e...

no. 3 example

[0056] Such as Figure 9As shown, in the third embodiment, the first wall portion 41w of the first housing portion 41 includes a cylindrical recess 41d surrounding the second metal shaft 61, and the second wall portion 2w of the second housing portion 42 includes a cylindrical recess 41d surrounding the second metal shaft 61. Two cylindrical recesses 42d of the metal shaft 61. In the recesses 41d and 42d, the inner peripheral surfaces 41s and 42s as peripheral surfaces and the second metal shaft 61 are not in contact with each other, and a substantially columnar space is formed. These substantially cylindrical spaces serve as the wear powder holding portion 72 that holds the wear powder 80 and foreign matter. That is, the wear powder holding portion 72 is provided in the fitting portion between the second metal shaft 61 and the first wall portion 41w and the fitting portion between the second metal shaft 61 and the second wall portion 42w. In the wear powder holding portion ...

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PUM

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Abstract

An actuator (10) is provided for driving a turbocharging pressure control valve (19) of a turbocharger (24). The actuator comprises a motor (36), an output shaft (26) and a speed reduction mechanism (37) for transmitting rotation of the motor to the output shaft by reducing a rotation speed. The speed reduction mechanism includes at least one gear (53) having a shaft hole (53h), a support shaft (61) inserted into the shaft hole and holding the gear rotatably, and wall portions (41w,42w) provided at both ends of the support shaft in a manner sandwiching the gear. The speed reduction mechanism further includes a wear powder holding portion provided radially outside an outer periphery of the support shaft and in at least one of two end portions of the shaft hole and the wall portions in a manner to hold wear powder or foreign substance without scattering.

Description

technical field [0001] The present invention relates to an actuator. Background technique [0002] JP 2003-214194 discloses an actuator with a reduction mechanism. The disclosed actuator is provided with a helical groove on an inner peripheral surface of a central hole of the driven gear at a fitting portion between the driven gear and the fixed shaft. The spiral groove is provided as a space so that foreign matter generated in the fitting portion such as wear powder of a driven gear or foreign matter entering the fitting portion from the outside can remain in the fitting portion. [0003] In the disclosed actuator, the shaft is in line contact with the spiral groove provided on the inner peripheral surface of the center hole of the driven gear. As a result, surface pressure at the contact portion increases, possibly promoting abrasion of the inner peripheral surface of the center hole of the driven gear or the shaft. Contents of the invention [0004] It is an object o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H1/20F16H57/021F16H57/023F16K31/04F16K31/53H02K7/116
CPCF16H1/20F16H57/021F16H57/023H02K7/116F16K31/043F16K31/535F16H2057/02034F16H2057/02043F16H2057/02082F02D41/0007F16H57/0031F02D41/0077G01D5/142F02D23/00
Inventor 河野尚明柳田悦豪山口雅史山中哲尔田中笃难波邦夫
Owner DENSO CORP