Vehicle air conditioner motor actuator

Abstract

To provide a motor actuator which suppresses a noise caused by vibration in an axial direction and a radial direction of a gear generated by a rotation of the gear with a simple configuration and in a cost-effective method.SOLUTION: Grease reservoirs 20a, 20b are formed on a lower case 11 and an upper case 12 in an axial direction of a second gear 16 that engages with a first gear 15 fixed on an output shaft of a motor, the reservoirs being filled with grease. The second gear 16 vibrates in an axial direction and a radial direction during rotation, and reduces the generation of noise by suppressing vibration by means of the grease inside the grease reservoirs playing a role like a buffer member. The grease reservoir only includes an outer peripheral wall or a groove shaped in a concentrically circular and polygonal with respect to the upper and lower cases, thus allowing a cost reduction.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an air conditioner motor actuator for an automobile (hereinafter referred to as a motor actuator) that transmits motor output to the outside via gears connected in one or more stages. [Background technology]

[0002] In motor actuators, generally, a structure in which a motor and a reduction gear are combined and covered with upper and lower resin cases is widely used. The reduction gear has multiple gear stages, and the final gear stage is provided with an output shaft. The output of the motor is transmitted to the outside via the multiple gear stages that are linked to the rotation of the gear attached to this output shaft.

[0003] Each stage of gears has axial and radial clearances with respect to its respective rotating shaft and the upper and lower cases that hold the rotating shaft. These clearances cause the gears to vibrate in the axial and radial directions when rotating, which can result in abnormal noise.

[0004] To address this noise, the level of noise has been reduced by increasing the precision of parts by reducing the axial and radial clearances for the gears, shafts, and upper and lower cases. There is also a method of suppressing gear vibration by pressing the gear shaft in the axial direction with a wave washer (see Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2006-340459 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, many of the parts used in this motor actuator are made of resin, and it is difficult to require dimensional accuracy from these resin parts due to the characteristics of resin, and the cost of making dies increases if a certain level of accuracy is required.In addition, using wave washers to prevent abnormal noise increases the number of parts, which leads to an increase in product costs.

[0007] SUMMARY OF THE PRESENT EMBODIMENT The present invention provides a motor actuator that suppresses axial and radial vibrations that occur when gears rotate. [Means for solving the problem]

[0008] The present invention has been made to solve the above-mentioned problems, and is a motor actuator that has a motor and multiple gears, and has a space on the case side for interposing a cushioning material, etc.

[0009] By placing a buffer material or the like in this space, the axial and radial vibration between the upper and lower cases and the gears is suppressed. The buffer material here refers to a material such as grease that absorbs shock (hereafter referred to as grease). This makes it possible to suppress abnormal noise caused by axial and radial vibrations that occur when the gears rotate. Effect of the Invention

[0010] Since strict dimensional accuracy is not required for the installation of the space for inserting the buffer member etc. (hereinafter referred to as the grease reservoir), it is possible to suppress the generation of abnormal noise caused by the vibration of the gears while keeping the cost of the mold for installation low. Also, the grease injected into the grease reservoir is unlikely to scatter inside the case because the gear acts as a lid over the grease reservoir. [Brief description of the drawings]

[0011] [Figure 1] 4 is a plan view showing the internal configuration of the actuator with the upper case and the motor case removed. FIG. [Diagram 2]2 is a cross-sectional view taken along the line AA in FIG. 1 , illustrating locations of grease pools when the upper case and motor case are attached, excluding details other than gears inside the motor. [Diagram 3] FIG. 2 is a plan view showing the upper case excluding internal components. [Figure 4] FIG. 2 is a plan view showing the lower case excluding internal components. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Fig. 1 is a plan view showing the internal configuration of the motor actuator with the upper case and motor case removed. Fig. 2 is a cross-sectional view taken along the line AA in Fig. 1, excluding details other than the gears inside the motor, illustrating the location of grease pools when the upper case and motor case are attached. Fig. 3 is a plan view showing the upper case excluding the internal components. Fig. 4 is a plan view showing the lower case excluding the internal components.

[0013] As shown in Fig. 2, the motor actuator has a lower case 11 and an upper case 12. The lower case 11 and the upper case 12 are provided with a shaft 14 that holds a gear. This shaft 14 is fixed by being inserted into a shaft insertion hole 22 of the lower case 11 and the upper case 12 in Fig. 3 and a shaft insertion hole 23 of Fig. 4. A second gear 16 is inserted into this shaft 14.

[0014] As shown in FIG. 1, the motor actuator is assembled by attaching the motor 13, the first gear 15, the second gear 16, the third gear 17, the fourth gear 18, and the output gear 19 that form the reduction gear section to the lower case 11, and then covering them with the upper case 12 and the motor case 21 shown in FIG. 2.

[0015] In the motor actuator having the above configuration, when electricity is applied to the motor 13, the first gear 15 rotates, and the torque is transmitted from the first gear 15 to the output gear 19 via the second gear 16, the third gear 17, and the fourth gear 18. This reduces the rotational speed of the first gear 15, and makes it possible to obtain a torque according to the reduction ratio from the output shaft of the output gear 19.

[0016] As shown in Figs. 2, 3 and 4, the motor actuator is provided with grease reservoirs 20a, 20b above and below the second gear 16, which are filled with grease.

[0017] The grease reservoirs 20a, 20b are configured in a concentric shape with respect to the shaft 14. In addition, the second gear 16 is shaped to cover the grease reservoirs 20a, 20b, so that the grease is less likely to scatter inside the case.

[0018] By filling the grease reservoirs 20a, 20b with grease, the grease suppresses vibrations of the second gear 16 in the axial and radial directions, thereby reducing the generation of abnormal noise.

[0019] Although the grease reservoirs 20a and 20b are provided for the second gear, they can also be provided for other gears.

[0020] The grease reservoirs 20a, 20b are formed by the outer peripheral walls 24a, 24b or grooves. The shape of the grease reservoirs does not necessarily have to be circular. As long as it can cover the range in which the gears vibrate, it can also be a polygonal shape such as a triangle or a square. [Explanation of symbols]

[0021] 11 Lower case 12 Upper case 13 Motor 14 Axis 15 First Gear 16 Second Gear 17 Third Gear 18 Fourth Gear 19 Output gear 20a, 20b Grease reservoir 21 Motor case 22,23 Shaft insertion hole 24a,24b Outer wall

Claims

1. A motor actuator having a reduction gear section consisting of a motor and a number of gears, characterized in that the motor actuator has grease reservoirs on the upper and lower case sides in the axial direction opposite the gears for storing at least one cushioning material such as grease to suppress vibration of the gears in the axial and radial directions relative to a rotating shaft (the rotating shaft is one that is molded integrally with the gears or the shaft and gears are separate components).

2. 2. The motor actuator according to claim 1, wherein the grease reservoir is formed by a concentric or polygonal outer peripheral wall or groove provided on the case above and below in the axial direction of the gear of the reduction portion.

3. 2. The motor actuator according to claim 1, wherein the gear has a shaft, the shaft being fixed in a shaft insertion hole in the upper case and the lower case, and the grease reservoir is provided in the vicinity of the shaft insertion hole.

4. 2. The motor actuator according to claim 1, wherein the grease reservoir is provided to suppress axial and radial vibrations of a reduction gear group consisting of a worm gear, a pinion gear, and a plurality of gears attached to an output shaft of the motor.

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