JPH0144841Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to a transmission device that uses planetary gears to change the speed of rotation of a driving shaft and transmits the rotation to a driven shaft.

(b) Prior Art For example, a transmission device is used to rotate the rotor blades of a dehydrating washing machine (generally a fully automatic washing machine) at a reduced speed relative to the driving shaft. Particularly, as there has recently been a demand for a washing machine that rotates its rotary blades at a low speed so as not to damage the laundry, such a transmission device becomes an important component. An example of this type of transmission device is shown in Utility Model Application No. 126226/1983 (Kokai No. 29456/1988) previously filed by the applicant.

This transmission will be explained based on FIGS. 2 to 8. Reference numeral 1 denotes a washing and dehydrating tank installed inside an outer tank 2, and a mounting base 3 with a horizontally long cross section is attached to the bottom of the tank by screws 4. I am wearing it. This mounting base 3 is the outer tank 2
Hemispherical seats 6, 6 of the hanging rod 5 are integrally formed at both more protruding ends. Further, the outer tank 2 has a similar catch (not shown) integrally formed in the lower part of the side wall in a direction perpendicular to the line connecting the seats 6, 6.
A hemispherical body 7 and a compression spring 8 are interposed between these seats and the lower end of the hanging rod 5, and the outer tank 2 is suspended from the machine frame (not shown) using the hanging rod 5 in a vibration-proof manner. There is. Flange portions 9, 9 are bent at both ends of the mounting base 3 in the non-longitudinal direction, and an upper bearing that pivotally supports the cylindrical shaft 10 for driving the dehydration tank 1 is provided at the center of the mounting base 3. Eleven cases 12 are integrally molded. The case 14 of the lower bearing 13 of the cylindrical shaft 10 is attached to the flanges 9, 9. The flange portions 9, 9 further include a motor 1.
5, a drain valve 16, and a solenoid (not shown) that opens and closes the drain valve 16 via a connecting rod 17, respectively.

A driving shaft 18 is inserted and supported in the cylindrical shaft 10, and a pulley 19 is fixed to the lower end of the shaft 18.
This pulley 19 and a pulley 21 fixed to a motor shaft 20 are connected by a belt 22.
Reference numeral 23 denotes a clutch device that controls whether or not the rotation of the driving shaft 18 is transmitted to the cylinder shaft 10. This is a conventionally known clutch device consisting of a clutch spring, etc. When the clutch is engaged, the cylinder shaft 10 rotates at the same speed as the driving shaft 18. It is something that makes you 24 is a water seal member.

A brake drum 25 is fixed to the cylindrical shaft 10, and a brake band 26, which has a brake lining attached inside, is crimped to the outer periphery of the drum 25 by its own elasticity.
A brake lever 27 is engaged with and disengaged from the bent piece at one end of the cylinder 6 to apply or release the brake on the cylinder shaft 10. A bottom substrate 28 is fixed to the bottom of the dehydration tank 1 with screws 29, and this substrate 28 is attached to the top 1 of the cylinder shaft 10.
Fixed at 0'.

A rotary blade 30 is disposed at the center of the bottom of the dehydration tank 1. The rotary blade 30 has a triangular prism-shaped protrusion in the center and is high in height, and blades 31 are protruded from each vertex of the triangular prism. The rotary blade 30 has a blade shaft 32
It is fixed with screws 33. The blade shaft 32 and the driving shaft 18 are connected through a reduction gear box 34 which is a transmission, and the rotation of the driving shaft 18 is reduced in speed and transmitted to the driven shaft, that is, the blade shaft 32.

The reduction gearbox 34 is composed of a gear case 35 formed by cutting aluminum die-casting, and a case cap 36 that closes the open portion of the lower end surface of the gear case 35. 3
7 is a screw that connects the gear case 35 and the case cap 36. As is clear from FIG. 4, the upper part of the driving shaft 18 is inserted into the gearbox 34 through a metal 39 through a through hole 38 provided in the center of the case cap 36, and its upper end is provided in the center of the sun gear 40. The sun gear 40 is inserted into a corrugated through hole 41, and four planetary gears 42 are meshed with the sun gear 40. End plates 43 and 44 are provided at the upper and lower ends of each planetary gear 42.
are fitted, and a shaft 45 is fitted in the center of these end plates 43, 44.
is inserted, and the upper and lower ends of this shaft 45 are connected to the carrier 4.
It is fitted into the bearing recesses 6 and 47. The outer side of each planetary gear 42 meshes with a fixed gear 49 formed on the inner circumferential surface of the outer circumferential ring 48 . This fixed gear 4
The upper and lower ends of the ring 9 are sandwiched between the end plates 43 and 44 from above and below, so that the outer ring 48 is connected to the carriers 46 and 4.
It is mechanically linked to 7. This outer ring 48 is fitted into the cylindrical inner surface 50 of the gear case 35. The outer ring 48 is provided with a plurality of arcuate recesses 51 in the circumferential direction. Inside the case cap 36, the cap 36 is connected to the gear case 3.
5, an annular protrusion 52 that receives the lower end surface of the outer circumferential ring 48 to restrict the movement of the outer circumferential ring 48 in the thrust direction and that fits into the lower end opening edge of the inner surface of the gear case 35 is integrated. A plurality of protrusions 53 are provided to protrude and further fit into the recess 51 to prevent the outer ring 48 from rotating.

In this manner, the outer circumferential ring 48 is immovably fixed within the gear 34 simply by attaching the case cap 36 to the gear case 35. 54 is an O-ring.

The lower end of the wing shaft 32 is inserted into a corrugated through hole 55 provided in the center of the upper carrier 46 . The wing shaft 32 is supported by metal members 57, 57 within a support tube 56 which is integrally provided with a projecting structure from the gear case 35. 58 is felt, and 59 is an oil seal. The gearbox 34 is placed on a boss portion 60 that projects integrally from the dehydration tank bottom substrate 28 and is fixed with screws 61. At this time, the upper end of the cylindrical shaft upper part 10' comes into pressure contact with a packing 62 attached to the lower surface of the case cap 36 to form a water seal so that the liquid in the dehydration tank 1 does not enter the gear box 34. 63 is the oil seal, 64 is the driving shaft 1
It is a metal that supports 8.

In such a structure, during washing, the clutch 23 is disengaged and power is not transmitted to the barrel shaft 10, and the brake is applied so that the barrel shaft 10 is stopped, and only the driving shaft 18 rotates. Then, the sun gear 40 rotates to rotate the planetary gear 42, and since the planetary gear 42 meshes with the fixed gear 49, it rotates along the fixed gear 49. In other words, the planetary gear 42 revolves around the sun gear 40 at a low speed while rotating, and the rotation of this revolution is transmitted to the upper and lower carriers 46 and 47 via the shaft 45, and the blade shaft 32 is decelerated and rotated. The blades 30 rotate at low speed. During dewatering, the clutch 23 is engaged and the brake is released, so the cylinder shaft 10 rotates at the same speed as the driving shaft 18, and the gearbox 34 also rotates at the same speed as the driving shaft 18, so each gear 4 in the gearbox 34 rotates at the same speed as the driving shaft 18.
0, 42, and 49 are meshed and do not rotate, but become integral, and as a result, the blade shaft 32 rotates at the same speed as the driving shaft 18 and cylinder shaft 10 without being decelerated, and the rotor 32 rotates in the dehydration tank 1. It rotates as one.

Here, the gearbox 34 is made of metal, has a shaft,
In order to attach the outer circumferential ring, etc., it is necessary to obtain roundness particularly on the inner surface 50 of the gear case 35, which requires extremely high precision. Therefore, in the past, the gear case 35 and case cap 36 were formed by cutting aluminum die-casting, and the outer ring 48 was also formed separately. Therefore, although there are no major problems in terms of strength and precision, assembly work is difficult and material costs and processing costs are high, so the overall cost tends to be high.

(c) Purpose of the invention This invention aims to reduce costs by improving the structure of the gearbox.

(d) Structure of the invention The invention constitutes a gearbox with a resin gear case having a cylindrical inner surface and a resin case cap that closes the open end of the case, and the case cap has a resin gear case with a resin gear case having a cylindrical inner surface. A cylindrical fitting wall to be fitted is formed, and a sun gear is provided in the gear box at the tip of the driving shaft, and a fixed gear is formed on the entire circumference of the inner peripheral surface of the fitting wall. The transmission includes: a planetary gear that meshes with the fixed gear and the sun gear; and a driven shaft to which revolution of the planetary gear with respect to the sun gear is transmitted.

That is, the outer ring is removed, the fixed gear is formed on a cylindrical fitting wall of the case cap, and this fitting wall is fitted to the inner surface of the gear case. Therefore, the work of assembling fixed gears can also be omitted.
Moreover, since the fixed gear is supported on the inner surface to ensure strength, cost reduction can be achieved.

(E) Embodiment The gearbox and its interior will be explained based on FIGS. First, the gear case 35 and the case cap 36 are molded from a strong resin such as glass-filled polypropylene or Diuracon using a top and bottom die. 65 is a downward recess formed in the upper part of the inner surface 50, and the projecting piece 6
6 is arranged vertically in an annular shape inside. Reference numeral 67 denotes a cylindrical fitting wall that is integrally formed upward with the case cap 36, and is fitted so as to overlap the inner surface 50, and is also fitted into the downward recess 65 from below. Since the fitting into the recess 65 is a so-called spigot fitting, the mounting strength is increased and the fitting position of the fitting wall 67 having a die cutting slope can be accurately determined. Reference numeral 68 indicates a fixed gear integrally formed on the inner peripheral surface of the center portion of the fitting wall 67 over the entire circumference, and reference numeral 69 indicates a support piece formed in a bulging manner at the lower part of the fitting wall 67.

A sun gear 70 is fixed to the upper end of the driving shaft 18, and meshes with four planetary gears 71. The planetary gears 71 are integrally formed of the same resin into the shape shown in FIG. That is, an insertion hole 72 for the shaft 45 is formed in the center of the cylindrical body.
At the same time, a gear 73 is formed on the outer periphery, and an annular downward recess 74 is formed between the center and the outer periphery,
An annular flange 75 is formed on the upper part of the gear 73 and protrudes beyond the tooth height. The recess 74 is intended to reduce material costs by stealing meat, and to shorten the molding cycle by speeding up cooling during molding.

The end plates 43 and 44 in the conventional example are omitted, and the shaft 45 is fitted into the bearing recesses of the carriers 46 and 47. Then, the wing shaft 32 is attached to the upper carrier 46.
is stuck. Support piece 69 for lower carrier 47
The gear 73 is placed on top of the fixed gear 68 to prevent the entire movement in the thrust direction, and to mesh the gear 73 with the fixed gear 68.

The flange 75 closely opposes (or abuts) the projecting piece 66 from below, and is also restricted from moving in the thrust direction.

In this way, the fixed gear 68 is installed accurately,
Moreover, it is strong enough. During driving, the meshing of resin gears reduces driving noise. and,
Since the deviation in the thrust direction is also small, reliable rotation transmission is achieved.

Furthermore, since the upper part of the gear 73 is hidden by the flange 75, the gear 73 does not come into contact with the protrusion 66 and be scraped by the rotational force, and shavings etc. will not enter between the gears and impede rotation transmission. However, there are no disadvantages such as generation of noise.

(F) Effects of the invention According to the invention, since the fixed gear is integrally formed on the fitting wall of the resin case cap, there is no need to assemble the fixed gear compared to the conventional example.
Since it can be supported by the inner surface, it is possible to provide an inexpensive transmission with ensured strength.

[Brief explanation of the drawing]

Figure 1 A and B are a cross-sectional view of the transmission device according to the present invention and a cross-sectional view of the main part (planetary gear), Figure 2 is a schematic longitudinal cross-sectional view of the lower part of the dehydrating washing machine, and Figure 3 is an enlarged longitudinal cross-section of the main part. 4 is a vertical cross-sectional view of the inside of the gearbox, FIG. 5 is a half-sectional view of the assembled parts, FIG. 6 is a view taken in the direction of arrow A in FIG. 5, FIG. 7 is a plan view of the case cap, and FIG. is a sectional view taken along the line O-A ₁ -A ₂ in FIG. 7; 35 is a gear case, 36...case cap,
34...Gearbox, 18...Driving shaft, 50...
...inner surface, 67...fitting wall, 68...fixed gear,
70...Sun gear, 71...Planetary gear, 32...
Wing axis (driven axis).

Claims (1)

[Scope of utility model registration request] A gear box is composed of a resin gear case having a cylindrical inner surface and a resin case cap that closes an open end of the case, and a cylindrical fitting that fits into the inner surface of the case cap. a sun gear that forms a surface and is provided in the gear box at the tip of the driving shaft; a fixed gear that is formed across the inner circumferential surface of the fitting surface; and a fixed gear and the sun gear. A transmission comprising planetary gears that mesh together and a driven shaft to which revolution of the planetary gears relative to the sun gear is transmitted.