JP2000329074A - Assembling method for rotary device and jig - Google Patents

Abstract

PROBLEM TO BE SOLVED: To assemble an inner rotor on a rotary shaft simply and correctly by guiding the rotor at a taper part disposed on an end part of the rotary shaft so as to position the rotor, when the rotary shaft is joined passing through a penetrating hole disposed on the rotor. SOLUTION: In the case where an oil pump 10 is assembled on a crank shaft 30, a protruded streak projection 38 formed on the crank shaft 30 is inserted along a recessed part in a key groove shape formed on a jig 40, the jig 40 and the crank shaft 30 are positioned, and then the jig 40 is attached on a small diameter part 34 of the crank shaft 30. A taper shaped tip part 41 of the jig 40 is inserted into an overlapped part where a penetrating hole of an inner rotor 14 of the oil pump 10 and a hole 28 disposed on a housing 12b are overlapped with each other, the oil pump 10 wherein the inner rotor 14 and the outer rotor 18 are assembled on each other is fitted to an intermediate diameter part 36 of the crank shaft 30, a joining position of the oil pump 10 is decided, the jig 40 is removed from the crank shaft 30, and then a joining work is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating device for driving a rotating shaft by an external rotating force such as an oil pump or a water pump to pressurize a fluid, or a rotating device using a pressurized fluid such as a hydraulic motor. The present invention relates to a method for assembling a rotating device driven to rotate and a jig used for assembling the rotating device.

[0002]

2. Description of the Related Art Conventionally, a rotating shaft, a compartment formed in a housing, an introduction hole for guiding a fluid to the compartment, a discharge hole for discharging a fluid from the compartment, and the rotating shaft are connected to the compartment. Many rotation devices have been proposed, including a hole that can be inserted into a chamber, an auxiliary hole facing the hole, and a rotor that is rotatably disposed in the compartment so as to be integrally rotatable with the rotation shaft. For example, an inner rotor having external teeth in a compartment formed in a housing, and an outer rotor having internal teeth that can be fitted to the external teeth of the inner rotor are eccentrically arranged, and the inner rotor rotates integrally with a rotation shaft. A trochoid type oil pump which pressurizes a fluid by changing the volume of a suction port communicating with an introduction hole and a discharge port communicating with a discharge hole by rotation of the oil pump is disclosed in JP-A-63-223382.
(Hereinafter referred to as a first prior art) and Japanese Patent Laid-Open No. 10-77.
No. 973 (hereinafter referred to as a second prior art). All of the rotating devices including the technology disclosed in these prior arts change the volume of the suction port and the discharge port by the rotation of the rotor in the compartment, so that the rotating device is disposed outside the rotor arranged in the compartment. Has space. Due to the presence of this space, the rotor is not fixed in the compartment when the rotating device is assembled, that is, before the rotor and the rotating shaft are joined. In addition, the rotor and the rotating shaft are joined by providing through holes through which the rotating shaft penetrates so that the rotor and the rotating shaft do not rotate relative to each other, and splines are respectively provided on the inner diameter of the through hole and the outer diameter of the rotating shaft. The rotary shaft is inserted into the rotor by forming a groove and inserting the rotary shaft into the rotor, or by forming the protrusion into the inner diameter of the through hole in a different circular shape and making the outer diameter of the rotary shaft the same shape. On the other hand, the size of the hole for inserting the rotating shaft into the compartment is set to be slightly larger than the outer diameter of the rotating shaft in order to prevent the fluid inside the compartment from leaking to the outside. In general, a sealing material (such as an oil seal) is disposed between them. Therefore, assembling the rotating device, after arranging the rotor in the compartment, inserting the rotating shaft from the outside of the housing through a hole formed in the housing, and further inserting the rotating shaft into the through hole of the rotor. Can be rotated in the compartment in conjunction with the rotating shaft.

[0003] In performing such an assembly, in the first prior art, when the rotating shaft is inserted, the position of the through hole of the rotor coincides with the inner diameter of the hole provided in the housing. An annular ring protruding in the axial direction of the rotating shaft is formed on the side surface, and the outer periphery of the ring is engaged with the inner diameter of a hole provided in the housing. By this engagement,
Even before the rotation shaft is inserted, the rotor is restricted from moving from a predetermined position in the compartment provided in the housing. In the second prior art, two opposed protrusions are formed inside a through hole of a rotor to provide a two-sided width portion, and the two-sided width portion has an arc-like shape protruding in the axial direction of a rotating shaft. A projection is formed, and the outer wall of the projection can be in contact with the inner diameter of a hole provided in the housing via a minute gap. More specifically, the technology disclosed in the second prior art is based on the fact that the annular ring disclosed in the first prior art is engaged with the inner diameter of the hole provided in the housing.
A small gap is set between the outer wall of the projection and the inner diameter of a hole provided in the housing in order to prevent the occurrence of sliding resistance during operation of the oil pump. Therefore,
Regarding the ease of assembling and the sliding resistance during pump operation, the second prior art discloses that when the rotating shaft is inserted into the rotor and joined, the position of the through hole of the rotor is within a predetermined range within a minute gap. Although it may deviate, the resistance due to sliding between the projection provided on the rotor and the inner diameter of the hole provided on the housing can be suppressed during operation of the pump.

[0004]

By the way, as is apparent from the above description, the projections projecting in the axial direction of the rotating shaft provided on the rotor disclosed in each of the first prior art and the second prior art. Is to restrict the movement of the rotor in the compartment to improve the assemblability of the oil pump.
Therefore, if the projection is brought into contact with the inner diameter of the hole provided in the housing as in the first prior art, the assemblability becomes the best, but sliding resistance is generated when the pump is operated. If a gap is formed between the projection and the inner diameter of the hole provided in the housing as in the second prior art, the sliding resistance during the operation of the pump is eliminated, but the position of the rotor is not fixed. The assemblability is poor.

Accordingly, it is an object of the present invention to provide a method of assembling a rotating device and a jig for the method, which all at once solve the contradictory problems of assemblability and sliding resistance.

[0006]

In order to solve the above-mentioned technical problems, a method of assembling a rotating device according to the present invention comprises a rotating shaft, a compartment formed in a housing, and an introduction hole for guiding a fluid to the compartment. A discharge hole for discharging fluid from the compartment, a hole formed in a housing into which the rotating shaft can be inserted into the compartment, and a rotor arranged in the compartment and joined to the rotating shaft so as to be integrally rotatable. A method of assembling a rotating device,
The rotating shaft penetrates through a through hole provided in the rotor and is joined, and at the time of joining, the rotor is guided by a tapered portion provided at the end of the rotating shaft to position the rotor in the compartment. . The basic idea of the present invention is that, before the rotary shaft is penetrated into the through-hole provided in the rotor and joined, the movement of the rotor in the compartment is not allowed by restricting the movement of the rotor in the compartment. are doing. But,
Even though the holes formed in the housing and the through holes formed in the rotor do not match, generally, some of the through holes formed in the rotor are located in the holes formed in the housing. are doing. Focusing on this, the tapered portion provided at the end of the rotating shaft at the overlapping portion of the hole and the through hole guides the position of the rotor in the compartment and moves the rotor to a position where it can be joined to the rotating shaft. obtain.

[0007] Preferably, an auxiliary hole facing the hole is formed in the housing, and the tapered portion may pass through the auxiliary hole and protrude from the housing. It is possible to increase the length of the tapered portion by penetrating the auxiliary hole, and reduce the taper angle from the tip of the tapered portion to the base of the tapered portion near the rotation axis, and gradually move the rotor. It can be moved to a predetermined position. Further, the tip of the tapered portion can be made small in diameter, and even if the overlapping portion between the hole and the through hole is a small region, the tapered portion can be inserted into this overlapping portion to guide the rotor.

Preferably, the tapered portion is a separate member attached to one end of the rotary shaft, and is detached from the rotary shaft after positioning the rotor in the compartment. By using the tapered portion as a separate member and being attachable to the end of the rotating shaft and being detachable after joining the rotating shaft and the rotor, the separate member having the tapered portion can be used repeatedly. Furthermore, after the assembly is completed, the weight of the rotating device can be reduced because there are no members and parts unrelated to the function of the rotating device.

Further, the method for assembling a rotating device according to the present invention includes a rotating shaft, a compartment formed in a housing, an introduction hole for guiding fluid to the compartment, and a discharge hole for discharging fluid from the compartment. A method of assembling a rotating device, comprising: a hole formed in a housing in which a rotating shaft can be inserted into a compartment; an auxiliary hole facing the hole; and a rotor disposed in the compartment so as to be rotatable integrally with the rotating shaft. The rotating shaft is joined through a through hole provided in the rotor, and the joining of the rotating shaft and the rotor is performed by attaching a jig having a tapered portion attachable to a tip of the rotating shaft. A first step, a second step of positioning the rotor in the compartment by guiding the joint of the rotor with the rotation shaft by the tapered portion of the jig, and a third step of removing the jig from the rotation shaft from the auxiliary hole side It is good to be joined. If the rotating device is assembled through these three steps, after completing the sub-assembly of the rotating device in which the rotor is arranged in the compartment of the housing, the rotating device is moved to a place where the rotor is joined to the rotating shaft, thereby facilitating the rotating device. Can be assembled.

A jig used in the method for assembling a rotating device according to the present invention includes a rotating shaft, a compartment formed in a housing, an introduction hole for guiding a fluid to the compartment, and a fluid discharged from the compartment. A discharge hole, a hole formed in a housing capable of inserting a rotating shaft into the compartment, an auxiliary hole facing the hole, and a rotor provided in the compartment and having a through hole allowing insertion of the rotating shaft. A jig for positioning the rotor in the compartment when the rotation device is assembled, particularly when the rotation shaft and the rotor are joined, and a mounting portion detachable from one end of the rotation shaft, and a mounting portion. And a tapered portion having the maximum outer diameter. The jig according to the present invention can be attached to and detached from one end of the rotating shaft by the attaching portion, can be used only when assembling the rotating device, and has a tapered portion provided on the jig to partition the rotor. Indoor positioning is possible.

Further, it is preferable that the length of the tapered portion of the jig is larger than the thickness of the rotor. By setting the size of the jig to be equal to or greater than the thickness of the rotor, the angle of the tapered portion can be reduced and the sliding resistance of the movement for positioning the rotor can be reduced. Also, the size of the tip of the tapered portion can be reduced, and even if the overlapping portion between the hole formed in the housing and the through hole formed in the rotor is small, the jig can be inserted into this overlapping portion and the rotor can be easily inserted. Can guide you.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of an oil pump 10 to be mounted by the mounting method according to the present invention. The oil pump 10 includes a housing 12, an inner rotor 14 disposed inside the housing, and an outer rotor 1
6 as a main constituent member. Housing 12
A circular concave portion 18 forming a compartment is formed, and the outer rotor 16 is disposed in the concave portion 18. The outer periphery of the outer rotor 16 is slidably rotatable on the inner wall of the recess 18, and a plurality of internal teeth 17 are formed on the inner periphery of the outer rotor 16. The inner rotor 14 is disposed at a position having a rotation center C2 separated from the rotation center C1 of the outer rotor 16 by a predetermined amount indicated by L in FIG. 15 are formed. At the center of the inner rotor 14, a through-hole 20 is provided to allow the insertion of the crankshaft 30 of the engine, and the crankshaft 30 passes through the through-hole 20. Crankshaft 3
0 and two through-holes 20 of the inner rotor 14 are provided with two flat portions 32 and 22, respectively.
Rotates integrally with the crankshaft 30 without relative rotation. Note that the shape of the through hole 20 of the inner rotor protrudes radially inward only in the region of the flat portion 22 in order to form the flat portion 22. In addition, the housing 12 is formed with a suction port 24 and a discharge port 26 so as to divide the concave portion 18 formed in the housing 12 into approximately two parts. The suction port 24 is connected to the housing 12 through a passage 25 formed in the housing 12. The discharge port 26 communicates with an unillustrated oil pan, and the discharge port 26 communicates with each of the unillustrated engines that require oil pressurized by the oil pump 10 via a passage 27 formed in the housing 12. As shown in FIGS. 5 to 7, the housing 12 includes a crankshaft 30.
And a hole 28 and an auxiliary hole 29 through which a cap (jig) 40 and a crankshaft 30 to be described later can pass. As shown in FIGS. 5 to 7, the housing 12 of the oil pump 10 includes a main body 12a and a lid 12b cast from an aluminum-based material, and the main body 12a and the lid 12b are It is fixed by a plurality of bolts 13.

The oil pump 10 shown in FIG. 1 has an outer rotor in which the inner rotor 14 rotates integrally with the rotation of the crankshaft 30 in the direction indicated by the arrow Y in FIG. 16
The inner rotor 17 rotates the outer rotor 16 in conjunction with the inner teeth 17. At this time, in the range of the suction port 24, the outer teeth 15 of the inner rotor 14 and the inner teeth 17 of the outer rotor 16
When the volume of the pump chamber 19 formed between them increases with rotation, oil is sucked from the oil pan through the passage 25. Conversely, in the range of the discharge port 26, the outer teeth 15 of the inner rotor 14 and the outer rotor 1
When the volume of the pump chamber 19 formed between the pump chamber 19 and the inner teeth 17 decreases with rotation, the pressurized oil is discharged to each engine through the passage 27.

FIG. 2 is an enlarged view of the end of the crankshaft 30. As shown in FIG. 2, a small diameter portion 34 for attaching a timing pulley (not shown) for transmitting rotation of the crankshaft to another member such as a camshaft of an engine (not shown) is provided at the tip of the crankshaft. A middle diameter portion 36 that fits into the through hole 20 formed in the inner rotor 14 is formed. In addition, medium diameter part 3
6 includes a flat portion 32 fitted to the flat portion 22 of the through hole 20.
Are formed. The small-diameter portion 34 is provided with a projection 38 that can be inserted into a recess 44 formed in an inner hole 42 of a jig 40 described later in the axial direction.

FIGS. 3 and 4 are single-piece views of the jig 40 used in the assembling method of the present invention. Since the jig 40 guides the through hole 20 formed in the inner rotor 14 formed of an iron-based material, an iron-based material or a material harder than the iron-based material is used. As shown in FIG. 3, a cavity (inner hole) 42 that can cover the small diameter portion 34 of the crankshaft 30 is formed inside the jig 40, and the sectional shape of the cavity 42 is as shown in FIG. 4. To crankshaft 3
0, which substantially matches the cross-sectional shape of the small diameter portion 34. That is,
A cylindrical portion having substantially the same diameter as the small diameter portion 32 of the crankshaft 30 and a concave portion 44 provided on the outer periphery of the crankshaft small diameter portion are formed. A flat portion 46 is formed on the outer periphery of the jig 40 at a position corresponding to the position of the flat portion 32 of the crankshaft 30. Further, the tip of the jig 40 has a hemispherical tip portion 41, and the outer shape of the jig 40 gradually decreases in diameter toward the tip portion 41 with the mounting end face 43 where the cavity 42 is open as the maximum diameter. It has a tapered shape. With this tapered shape, as shown in FIG.
The width of the flat portion 46 formed on the outer periphery of the outer peripheral portion also decreases in the axial direction as approaching the distal end portion 41.

Next, an assembly process of the present invention for fixing the oil pump 10 to the crankshaft 30 will be described with reference to FIGS. The oil pump 10 shown in FIGS. 5 to 7 is an oil pump having a sectional view taken along the line BB of FIG.

First, the housing 12 of the oil pump 10
In the circular concave portion 18 formed in the main body portion 12a,
The inner rotor 14 and the outer rotor 18 are arranged,
The lid 12b is fixed to the main body 12a with bolts 13.

Next, the small diameter portion 3 of the crankshaft 30
The jig 40 is attached to the distal end of the crankshaft 30 so as to cover the crankshaft 4. At this time, the projections 38 provided on the small-diameter portion 34 are inserted along the recesses 44 formed in the cavities 42 of the jig 40, so that the flat portions 46 of the jig 40 and the flat portions 32 of the crankshaft 30 are Can be easily aligned.

Thereafter, the tip 41 of the jig 40 attached to the crankshaft 30 is inserted into the overlapping portion of the through hole 20 of the inner rotor 14 and the hole 28 provided in the housing 12. At this time, the outer rotor 16 is
The inner rotor 14 has a plurality of pump chambers 19 outside the inner rotor 14 although it does not move in the recess 18 because the outer periphery has substantially the same diameter as the circular concave portion 18 formed in FIG. Therefore, the outer rotor 16 can freely move within the internal teeth 17 of the outer rotor 16. However, the area of the through hole 20 formed in the inner rotor 14 and the area of the hole 28 formed in the lid 12b of the housing 12 are sufficiently larger than the area where the plurality of pump chambers 19 are formed. An overlapping portion between the through hole 20 of the housing 14 and the hole 28 provided in the housing 12 can always be ensured, and the overlapping portion is provided with the tip portion 41 of the jig 40.
Can be inserted. In this way, as shown in FIG. 5, by inserting the oil pump 10 into the jig 40, the through hole 20 of the inner rotor 14 is also inserted into the jig 40, and approaches the base end 43 of the jig 40. As a result, the position of the inner rotor 14 approaches the set position so as to be originally disposed. Then, as shown in FIG.
And the outer diameter of the middle diameter portion 36 of the crankshaft 30 are the same, so that the oil pump 10 guided by the jig 40 can be easily transferred to the middle diameter portion 36 of the crankshaft 30. be able to. Then, as shown in FIG. 7, the oil pump 10 is guided to the deepest position of the middle diameter portion 36 of the crankshaft 30, and the joint position between the crankshaft 30 and the oil pump 10 is determined.

Finally, the jig 40 is connected to the crankshaft 30.
, The joining of the crankshaft 30 and the oil pump 10 is completed.

According to the present embodiment, the flat portion 46 is formed on the outer periphery of the jig 40, and the flat portion 46 is
Is aligned with the flat portion 32 of the crankshaft 30 at the time of attachment to the crankshaft 30, so that the flat portion 22 formed in the through hole 20 of the inner rotor 14 and the flat portion 32 of the crankshaft 30 can be easily aligned. It can be carried out.

Further, in the present embodiment, the assembling method of the present invention has been described using a trochoid type oil pump. However, the assembling method and jig of the present invention are limited to a trochoid type oil pump. The present invention can be applied to other types of oil pumps such as a vane type, and a positive displacement pump for other uses. Furthermore, the assembling method and the jig of the present invention supply air not only to a pump but also to a motor that rotates a rotating shaft by supplying a pressurized fluid, for example, a radiator for cooling engine cooling water. The present invention can also be applied to a hydraulic motor or the like used for rotating a fan for performing the operation.

[0024]

According to the present invention, the rotation of the rotating device, such as a projection for restricting the movement of the rotor in the compartment, for assembling to the rotating shaft to the rotor arranged in the compartment of the rotating device. Sometimes, there is no need to provide a member for increasing the rotational resistance, and the inner rotor can be easily assembled to the rotating shaft.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a cross section of an oil pump mounted by a mounting method of the present invention.

FIG. 2 is a drawing showing an end of a crankshaft joined to an inner rotor of an oil pump.

FIG. 3 is a single-piece drawing of a jig used in the assembling method of the present invention.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a view showing an attached state of an oil pump according to an assembling method of the present invention, and shows a state in which the oil pump is guided by a jig.

FIG. 6 is a view showing an attached state of an oil pump according to an assembling method of the present invention, and shows a state in which the oil pump moves from a jig to a crankshaft.

FIG. 7 is a drawing showing an attached state of the oil pump according to the assembling method of the present invention, and shows a state in which the oil pump is guided to a predetermined position on the crankshaft.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 oil pump (rotating device) 12 housing 14 inner rotor (rotor) 18 recess (compartment chamber) 20 through hole 24 suction port (introduction hole) 26 discharge port (discharge hole) 28 hole 29 auxiliary hole 40 jig

Claims (6)

[Claims] 1. A rotating shaft, a compartment formed in a housing, an introduction hole for guiding fluid to the compartment, a discharge hole for discharging fluid from the compartment, and the rotating shaft inserted into the compartment. A method of assembling a rotating device comprising a hole formed in the housing and a rotor arranged in the compartment and integrally rotatably joined to the rotating shaft, wherein the rotating shaft is attached to the rotor. The rotor is guided by a tapered portion provided at an end of the rotating shaft at the time of the joining to position the rotor in the compartment. A method of assembling a rotating device. 2. The rotating device according to claim 1, wherein an auxiliary hole facing the hole is formed in the housing, and the tapered portion protrudes from the housing through the auxiliary hole. Assembly method. 3. The rotation according to claim 2, wherein the tapered portion is a separate member attached to one end of the rotation shaft, and is removed from the rotation shaft after positioning the rotor in the compartment. How to assemble the device. 4. A rotating shaft, a compartment formed in a housing, an introduction hole for guiding fluid to the compartment, a discharge hole for discharging fluid from the compartment, and inserting the rotating shaft into the compartment. A method of assembling a rotating device comprising a hole formed in the housing, an auxiliary hole facing the hole, and a rotor arranged in the compartment so as to be rotatable integrally with the rotating shaft, The rotating shaft is joined through a through-hole provided in the rotor, and the joining of the rotating shaft and the rotor is performed by attaching a jig having a tapered portion attachable to a tip of the rotating shaft. A first step, and a second step of positioning the rotor in the compartment by being guided by a tapered portion of the jig at a joint between the rotor and the rotating shaft,
A method of assembling a rotating device, comprising joining the jig by a third step of removing the jig from the rotating shaft from the auxiliary hole side. 5. A rotary shaft, a compartment formed in a housing, an introduction hole for guiding fluid to the compartment, a discharge hole for discharging fluid from the compartment, and inserting the rotary shaft into the compartment. At the time of assembling a rotating device including a possible hole formed in the housing, an auxiliary hole facing the hole, and a rotor provided in the compartment and having a through hole that allows insertion of the rotating shaft. A jig for positioning the rotor in the compartment when joining the rotating shaft and the rotor, particularly, an attaching portion detachable from one end of the rotating shaft, and an outer diameter of the attaching portion. And a taper portion having a maximum diameter. 6. The jig according to claim 5, wherein the length of the tapered portion is larger than the thickness of the rotor.