JPS5917066A - Lubricative supporting device for outer pin of rotation converting mechanism - Google Patents

Abstract

PURPOSE:To have sufficient lubrication between trochoidal cogs and pin, in a rotation converting mechanism in which the inner gear consists of a pin in the circular cog shape and the outer gear is in trochoidal cog shape, by furnishing an oil groove for lubrication between the pin and casing. CONSTITUTION:When an eccentric member 6 formed as in a single piece with the input shaft 1 rotates, the external gear 11 orbits (swings) with rollers 10 interposed while the roller holes 13 excavated in this external gear 11 are circumscribed with the inner rollers 14. Because eccentric rotation of the eccentric member 6 is absorbed in the inner roller holes 13, which is each larger than the diameter of the inner roller 14 by an amount corresponding to twice (2e) the eccentricity e of the eccentric member 6, the external gear 11 does not make rotation round its own axis but makes only orbiting (swinging rotation), and this orbiting causes rotation of the internal gear 19, which is equipped with pins 20 meshing with the external gear 11. The internal gear 19 which functions also as rotary casing is equipped with oil grooves 24A, 24B in order to lubricate the meshing parts between the trochoidal cogs 12 of external gear 11 and the pins 20 of internal gear 19.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is characterized in that the internal gear has a circular arc tooth profile made of a pin or a combination of a pin and a roller, and the external gear has a trochoid tooth profile made of an ebitrochoid parallel curve. The present invention relates to an improvement in a rotation conversion mechanism that reduces input rotation speed and transmits the input rotation to an internal gear via an eccentric body fitted to an external gear, and more particularly relates to a lubricating support device for an external pin in the rotation conversion mechanism.

A fluid pressure reducer using this type of mechanism is already known as described in Japanese Patent Application Laid-Open No. 56-39341.

However, in this conventional device, the rotation of the hydraulic mechanism is applied to the central axis of the entire device, and gears are provided at 120° intervals outside the pinion attached to the end of this shaft, and the rotation of the pinion is applied to the gear. Each of the gear shafts has an eccentric body, and there are six gears. Since the oscillating rotation of the external gear to be held is obtained and this is extracted as the decelerated rotation of the internal gear provided on the outermost periphery, there are some difficulties in the following points.

Since input is transmitted by meshing with the six gears of the input shaft pinion, the structure is complex and high cost.

Eccentric mechanisms are required in the same number as gears, high processing precision is required to synchronize them, and assembly is not easy.

In addition, since the six gears provided on the outer periphery of the pinion cover the entire circumference, the outer size becomes large, which is a problem in terms of miniaturization.

As a solution to all of the above deficiencies, a swash plate type fluid pressure motor is installed concentrically with the central shaft, and the external gear is rotated eccentrically by the central shaft rotated by this, and the internal gear that meshes with the core external gear is fully decelerated. A mechanism to do so has also been proposed.

In the previously proposed rotation conversion mechanism, there is insufficient lubrication at the meshing part between the trochoidal tooth profile of the external gear and the external pin that forms the internal gear, and the impact when the external gear and internal gear come into contact is large, making it necessary to have an adequate external pin support structure. I couldn't say that.

The purpose of the present invention is to improve the above-mentioned drawbacks and to improve the external gear and internal gear (
The purpose of the present invention is to provide a support device that provides sufficient lubrication with the inner bottle (inner bottle) and reduces impact.

This will be explained in detail below using figures.

FIG. 1 is a cross-sectional view of a rotating mechanism showing an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line A--A in FIG. FIG. 6 is an enlarged view of the outer pin portion.

The input shaft 1 is rotated by, for example, a swash plate type fluid pressure motor M, is integral with this output shaft, and is supported within the fixed casing 2 by bearings 6 and 4. A key groove 5 is cut in one end of the input shaft 1, and a key 9 is fully driven in between the input shaft 1 and a key groove 7 formed on the inner circumferential surface of the hollow eccentric shaft 1 to be key-coupled. The present invention employs appropriate coupling means such as spline coupling in addition to key coupling.

Two eccentric bodies 6 are mounted on the eccentric body shaft 6 with a 180° phase shift.
A and 6B are integrally formed, and each eccentric body 6A
, 6B are fitted with eccentric bearings 8A, 8B, and rollers 10 are provided on the outer periphery thereof.

The external gears 11A and 11B are fitted onto the respective eccentric bodies 6A and 6B via the bearings 8A and 8B and the rollers 10, and have trochoid tooth profiles 12 on their outer peripheral surfaces.

Furthermore, each of the external gears 11A and 11B has an inner roller hole 13 that is larger than the diameter of an inner roller 14, which will be described later, by twice the eccentricity θ of the eccentric body (SA, 6B).
An inner roller 14 is fitted inside. This roller 14 is fitted onto the outer periphery of the inner bottle P, and is supported by the inner bottle holding 7 flange 15 and the inner bottle holding ring 16.

Spacers 17A and 17B are provided between the external gears 11A and IIB, and between the inner pin holding 7 flange 15 and an angular contact ball bearing to be described later, respectively. The inner bottle holding 7 flange 15 is fixed to the fixed casing 2 by bolts 18.

The fixed casing/internal gear 19 has a large number of external pins 2 on its inner peripheral surface.
0 is arranged to form an arcuate internal gear, and this gear is an external gear 11A.
, 11B, and when the external gears 11A, 11B revolve (swing) once due to one rotation of the eccentric body shaft B, and the difference in the number of teeth between the external gears 11A, 11B and the internal gear 19 is one,
The internal gear 19 rotates by one tooth.

The rotating casing/internal gear 19 has an angular ball bearing 22 between it and the fixed casing 2, and both rotate relative to each other.

Furthermore, a part of the rotary casing/internal gear 19 is provided with an attachment part 23 for attaching to another driving part, for example, to drive a wheel or the like in rotation.

Although the explanation so far is the same as that of the previously proposed rotation conversion mechanism, the following configuration is added in the present invention.

Referring also to FIG. 6, there are two lubricating oil grooves 2 in this embodiment between the outer bin 20 and the rotating casing/internal gear 19.
4A and 24B are provided. The lubricating oil groove 24A is provided facing the outer circumferential position of the trochoidal tooth profile 12 of the external gear 11A, and the lubricating oil groove 24B is provided facing the outer circumferential position of the trochoidal tooth profile 12 of the external gear 11B. Therefore, the outer pin 20 is supported by the rotating casing/internal gear 19 at six points H, J, and J, and is in contact with the trochoid tooth profile 12 at the other end.

The lubricating oil grooves 24A and 24B serve as passages for lubricating oil, and at the same time, serve as escape gaps for shock mitigation when the outer pin 20 contacts the trochoidal tooth profile 12.

It should be noted that since the present invention aims at lubrication as the primary objective, the lubricating oil groove 24 includes all grooves of one or more grooves, and no particular positional limitation is required.

Furthermore, if the aim is to achieve zero impact mitigation, the lubricating oil groove 24 is placed at a position facing the outer periphery of the trochoid tooth profile 12, but it does not have to be in that position strictly; Any material that can function as a gap through which the outer bottle 20 can bend and escape when an abnormal force is applied to the outer bottle 20 may be used.

Furthermore, as described above, it is desirable that the number of lubricating oil grooves 24 of the present invention be equal to the number of external gears 11.

The present invention configured as described above will be explained in detail.

First of all, swash plate type fluid pressure motor M? When the input shaft 1 is activated and the input shaft 1 is rotated, the rotation of the input shaft 1 is transmitted to the eccentric shaft 6 via the key 9, and the eccentrics (5A, 6B rotate.
, 6B are transmitted to two external gears 11A and IIB, respectively, and the external gears 11A and 11B revolve (swing) while their inner roller holes 13 are in circumscribed contact with the inner roller 14, and eventually the eccentric body 6
The eccentric rotation of A and 6B is controlled by the eccentric body 6A from the diameter of the inner roller 14.
, 6B, the external gears 11A, 11B do not rotate but only revolve (oscillating rotation), and this revolution causes the external gears 11A, 1
The internal gear 19 meshed with 1B rotates by (n-m) (n: number of teeth of the internal gear, m: number of teeth of the external gear).

Therefore, it is possible to take out the output rotation of the swash plate type wave body pressure motor M as a decelerated rotation.

In the above operation, the trochoidal tooth profile 12 of the external gear 11
It is necessary to lubricate the meshing part between the outer pin 20 and the outer pin 20, but in the present invention, the lubricating oil always flows throughout the lubricating oil groove 24 and is retained, so lubrication is performed while rotating. .

Furthermore, the trochoidal tooth profile 12 and the outer pin 20 may come into impact contact due to external loads, manufacturing errors, and the like. In the conventional type, the outer pin 20 cannot be bent, which increases frictional resistance and may cause breakage.

In the present invention, when the outer pin 20 is pushed in the direction F in FIG. 6 by the trochoid tooth profile 12, the outer pin 20
4 and absorbs the displacement.

Although the above description has been made as a speed reduction mechanism, it can also be used as a speed increase mechanism.

Further, the number of external gears may be one or more, and in the embodiment described above, by shifting the external gears by 180 degrees, the total load is divided into two equal parts, and the centrifugal force due to the oscillating rotation is canceled out.

Therefore, when n external gears are provided, all the external gears may be arranged with a phase difference of 5600/n. Furthermore, when n external gears are provided, it is desirable to provide n lubricating oil grooves facing each other on the outer periphery of the gears.

The effects of the present invention explained above are as follows.

The structure of the lubricating oil groove is simple, and the lubricating structure can be used while keeping the axial length and radial length unchanged.

Since the lubricating oil groove is a circumferential cut, there is no unbalanced force during rotation.

If a lubricating oil groove is provided opposite the outer circumference of the trochoidal tooth profile, the deformation of the outer bottle can be absorbed by the lubricating oil groove.
This reduces frictional resistance, improves durability, and facilitates processing and assembly.

Other effects of the rotation conversion mechanism itself include the following.

The structure is simple because no pinions, gears, etc. are involved in the rotation transmission mechanism of the input shaft.

By removing the bolt 18, the device can be divided into a drive source portion and a deceleration portion, which can be replaced with each other, resulting in a highly versatile device.

Since the spacer is provided, there is no need to pay attention to the accuracy of parts machining, and it is easy to correct wear in the thrust direction.

Since the cover is also used for the internal gear, it is lightweight, reduces the number of parts, and reliably prevents dust from entering.

(Note that the sealing is done only by the seal cover 25 and mechanical seal 26, and there is no dust intrusion other than in these parts.) Maintenance is easy. That is, by removing the bolts 27 provided on the cover, the external gear and the inner bottle support ring can be removed, and then by removing the bolts 18, it can be easily disassembled.

As explained above, according to the present invention, it is possible to obtain a small, high-performance, and low-cost rotation conversion mechanism with a small number of parts, and at the same time, it is possible to obtain lubrication and smooth rotation of the rotation conversion mechanism with a simple mechanism. It is something.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the present invention, and Fig. 2 is a sectional view showing the entire embodiment of the present invention.
FIG. 6 is an enlarged sectional view of the outer bottle portion. 1: Input shaft M: fI + rice-shaped flow type fluid pressure motor: Fixed casing 3, 4: Bearing 5: Keyway 6: Eccentric body shaft 6A, 6B: Eccentric body 7: Keyway 8A. 8F: Eccentric bearing 9: Key 10: Roller 11A, 1
1B: External gear 12 Nitrochoid tooth profile 16: Roller hole 14: Inner roller 15: Inner pin holding flange P: Inner pin 16 Two inner pin holding rings 17A, 17B spacer 18: Bolt 19: Rotating casing and internal gear 20
:Outer pin 21:Cover 22:Angular ball bearing 20
: Mounting part 24; Lubricating oil groove. Sub-Agent Patent Attorney Tsuji San Department Figure 2-385- Figure 3

Claims (1)

[Claims] (1) A shaft 1 provided in a fixed casing 2 and attached to a driving source or a driven source, an eccentric shaft 6 fitted and connected to the shaft 1, and an eccentric shaft 6 on the eccentric shaft 6. an external gear 11 fitted on the outer periphery of the eccentric body and having a trochoidal tooth profile on the outer periphery; The inner roller 14 is fitted into the inner pin attached to the inner pin holding 7 flange 15 attached to the fixed casing 2, and the outer pin 21 is disposed on the inner peripheral surface so as to mesh with the trochoidal tooth profile of the external gear 11. In a rotation conversion mechanism consisting of a casing/internal gear 19 and a driven source or drive source on the deceleration side formed in the rotating casing/internal gear 19, at least One or more lubricant grooves 2
4. A lubricating support device for an outer pin in a rotation conversion mechanism, characterized in that: (2. In claim 1, the lubricating oil groove 24 is provided at the outer circumferential position of the trochoidal tooth profile 12 of the external gear 11. A lubrication support device for an outer bin in a rotation conversion mechanism. (5) ) In claim 2, the external gear 11 is
A lubricating support device for an external pin in a rotation conversion mechanism, characterized in that two lubricating oil grooves 24 are provided at the outer peripheral position of the trochoid tooth profile 12 of the external gear 11.