JPH02185682A - gerotor pump - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a zero rotor pump constructed by engaging a male segment rotor inside a female segment ring.

BACKGROUND OF THE INVENTION A ring has more segments (usually one more) than a rotor, and their axes are eccentric. On one side of the blade surface including the shaft, a small chamber surrounded by the corresponding segment is open to the inlet side, and on the other side of the blade surface, it is open to the exit side.When the two are rotated relative to each other, the above 2. The two chambers change their dimensions while rotating about their axis, thereby causing an inflow into the chamber on the inlet side and an extrusion toward the outlet side on the outlet side. pump like this.

From now on, I will refer to it as ``this Yuzu pump''.

Conventional pumps of this type have a male rotor fixed to the drive shaft, for example by means of a key, which shaft is journalled in an axially extending zone, for example in the pump casing wall, preferably in two positions on the shaft. And one of them is placed on either side of the biting part. The shaft is also remotely secured to a driving pulley, sprocket, or gear (collectively referred to as a "gear"). These factors determine the axial length of the shaft to be added to the axial length required for the required volumetric displacement.

(Problem M to be Solved by the Invention) The object of the invention is to improve this type of pump, in particular to make it possible to shorten the shaft length.

(Means and effects for solving the problem) According to the present invention, this type of pump is characterized in that the shaft is fixed to the pump body, and the rotor is directly or indirectly supported by the shaft. .

If the shaft is force-fitted into the pump body, for example, the shaft length required for attachment to the body will be inherently shorter than if the shaft is cantilevered and supported by separate bearings, or if the shaft is mounted in other designs. direction 2
shorter than when arranging two bearing sets. However, it is also possible to make the shaft and the body as a common integral part, for example by casting, in which case the length required to connect the shaft and the body is even shorter.

When the driving force is applied directly from the gear to the rotor,
The gear is directly supported by the shaft, so that the rotor is placed on the gear. When the driving force is directly applied to the ring, the gear can be pivotally supported on the main body, and the rotor can be pivotally supported directly on the shaft.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

Referring first to FIGS. 1 and 2, the pump body 10
is provided with one or more inlet passages 12 that open through a side wall (not shown) into a cavity containing a ring 14 and a rotor 16. An outflow passage opens from this cavity. Both the inflow and outflow roads open radially or tangentially from the cavity, or through one or the other side wall, or a combination thereof as required.

The shaft 18 is fixed to the main body, for example by press fitting. In FIG. 1, the shaft is provided with bushings at 20 and 22, and supports the rotor 16 and the drive gear 24, respectively. Passage systems 30 and 32 indicated by broken lines are ports 34
The bushings are lubricated by communicating with the bushings.

The drive gear (e.g., sprocket 24) is provided with an axially extending dog 28 (see FIG. 2) that meshes with a similar dog 26 in the rotor 16, thereby providing direct gear and rotor meshing. Transmits driving force between the two. Due to this.

The gears drive the rotor, which drives the rings at different speeds to perform normal zerotor bomb operation.

Next, referring to FIG. 3, the overall structure is similar to that described above except that the gear 24 has a boss portion 38 that is longer than the entire axial length of the rotor 16, whereby the rotor is indirectly supported on the shaft. This is almost the same as in the case of . Boss and rotor are 4
6 are connected to each other by keys or splines 1
Direct drive occurs between the two.

Referring now to FIG. 4 (the same numbers are used for the same parts as in FIGS. 3, 5, and 6FJ4), the shaft 18 includes a bushing 20. which pivotally supports the rotor 16.
I'm wearing 22. The ring 14 is attached directly to the cylindrical body 10, and on the outer periphery of this body there are further:
There is a bushing 50 that is concentric with the axis of the shaft 18 and supports a drive pinion 52 . The pinion meshes with the pinion 52 on its outer periphery and has an extension 5 of the shaft at 56.
Rotor 16 by spider 54 splined at 8
are combined as one body. As a result, the pinion 52
drives rotor 18, which in turn drives ring 14. In the case of FIG. 4, the cross section shows the meshed rotor and ring viewed from an outside diameter line.

Referring now to FIG. 5, the pinion 52 is now splined at 60 into an axial extension 62 of the ring 14. The rotor 16 is connected to the shaft 1 fixed to the pump body by a bushing 20 as in the case of FIG.
They are arranged on 8.

Next, referring to FIG. 6, in this case the pinion 52 is
It is splined at 56 into an axial extension 58 of the rotor 16 which rests on the shaft 18 through bushings 20,22. The pinion or pinion 50 is in contact with the circumference of the main body 10 via a bush.

4 and 6, the body of the gear 24 (pinion 52) in FIG. While the end face is formed near the arrow 64 in FIG. 6, the washer-like member 66 of the ring is formed in FIG.
performs the same function and is the same except that it is held by the spider. Also shown in FIG. 5, body plate 70 is held in place by bolts 72 and serves the same function of completing the pump body cavity.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing a first embodiment of the present invention, FIG. 2 is a partial sectional view thereof, and FIGS. 3 to 6 are first views showing second to fifth embodiments of the present invention. It is a sectional view similar to. 10... Pump body 12... Inflow passage 14... Ring, ring 16... Rotor 18... Shaft 20... Bush 22... Bush 24... Sprocket 26... Dog 28 ... Dog 30 ... Passage system 32 ... Passage system 34 ... Port 38 ... Boss portion 46 ... Spline (or key) 50 ... Bush 52 ... Pinion 54 ... Spider 56... Spline 58... Extension part 60... Spline 62... Extension part 64... Arrow 66... Washer-like member 70... Body plate 72... Bolt

Claims (1)

[Claims] 1. A pump of this type, characterized in that the shaft is fixed to the pump body, and the rotor is directly or indirectly supported by the shaft. 2. The shaft is face-fitted to the pump body.
The pump according to claim 1. 3. The pump according to claim 1, wherein the shaft is integral with the pump body. 4. The pump according to claim 1, wherein the rotor is driven by a gear and is pivotally supported by the shaft of the gear, and the rotor and the gear mesh with each other. 5. The pump according to claim 4, wherein the rotor and gear are axially adjacent and both are supported on the shaft via insert bearings that are also axially adjacent. 6. The gear has a boss extending in the axial direction, and this boss is supported by the shaft via an insertion bearing, and the rotor surrounds the boss, and the boss and rotor are mutually connected by a key or a spline. 5. The pump of claim 4, wherein the pump is coupled. 7. The gear is pivotally supported on the pump body by an inserted bear lip and drives the rotor via a radially extending member;
The pump according to claim 1. 8. The rotor penetrates the pump body and protrudes in the axial direction,
8. The pump of claim 7, further comprising a drive extension that engages the radially extending member. 9. The pump of claim 7, wherein said radially extending member forms a side end wall of the pump. 10. The pump according to claim 1, wherein the gear is pivotally supported on the pump body and drives the ring through a spline or the like.