JPH0417835Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention adjusts the side clearance between the rotor side surface of a rotary vane pump and the inner side surface of the side plate on both sides of the casing facing the side surface.
This invention relates to a side clearance adjustment mechanism for a rotary vane pump.

[Prior Art] Conventionally, the side clearance between the rotor side surface of a rotary vane pump and the inner side surface of the side plate facing the side surface is adjusted as described below.

One of them is the surface surrounding the opening of the fitting hole of the side plate into which the bearing that supports the rotor is inserted, and the surface surrounding the opening, as described in the specification of Utility Application No. 108731/1983. Liners such as paper of various sizes and thicknesses are interposed between the bearing presser, which presses the outer race side of the bearing inserted into the fitting hole of the side plate, which is screwed into the side plate using bolts. This method adjusts the side clearance between the rotor side surface and the inner side surface of the side plate by adjusting the position of the bearing in the fitting hole of the side plate on both sides of the casing.

The other method is to provide a bearing holder with a male thread carved on its outer circumference that presses against the outer race side of the bearing fitted into the fitting hole of the side plate, and the bearing holder has a female thread on its inner peripheral surface. Screw it into the fitting hole of the side plate with engraved on it, and while pressing the tip of the bearing holder into contact with the outer race side of the bearing in the fitting hole, rotate the bearing holder in the forward and reverse directions within the fitting hole. By moving the bearing retainer back and forth in the fitting hole and adjusting the position of the bearing in the fitting hole of the side plate on both sides of the casing, the side clearance between the rotor side surface and the inner side surface of the side plate can be adjusted. This is the way to do it.

[Problems to be solved by the invention] However, liners such as paper of various sizes and thicknesses are interposed between the bearing holder and the surrounding surface of the opening of the fitting hole of the side plate. The only way to adjust the side clearance between the side surface of the rotor and the inner surface of the side plate is to use liners such as paper that have a minimum thickness of around 0.03 mm with large increments. With the adjustment method using It was not possible to adjust the clearance quickly and easily.

In addition, the side clearance between the rotor side surface and the inner surface of the side plate is adjusted by adjusting the position in the fitting hole of the other bearing retainer screwed into the fitting hole of the side plate. This method involves carving a female thread on the inner circumferential surface of the large-diameter fitting hole of the side plate into which the male thread around the outside of the bearing holder is screwed, which requires a large amount of work and large-scale equipment, making it difficult to manufacture rotary vane pumps. This poses a problem in that it makes it difficult to operate the pump and makes the pump expensive.

The present invention was devised to solve this problem, and its purpose is to quickly and easily adjust the side clearance between the side surface of the rotor and the inner surface of the side plate facing the side surface in very small increments. An object of the present invention is to provide a side clearance adjustment mechanism for a rotary vane pump that does not make manufacturing the rotary vane pump difficult.

[Means for Solving the Problems] In order to achieve the above object, the side clearance adjustment mechanism of the rotary vane pump of the present invention has the following features:
As shown in FIGS. 3 to 3, a rotor 3 having vanes 2 is placed inside a casing 1.
In a rotary vane pump, a rotary vane pump is rotatably supported on side plates 4 on both sides of a casing 1 via bearings 5.
The outer race 5 of the bearing is fitted into the fitting hole 6 so as to be movable in the direction of the rotor axis 3a, and the outer race 5 of the bearing is fitted into the opening peripheral surface 6a of the fitting hole and into the fitting hole 6.
A side surface is integrally covered with a bearing holder 7, and the bearing holder 7 is screwed to the opening peripheral surface 6a of the fitting hole using bolts 8, and the bearing holder 7 is attached to the fitting hole 6 of the side plate. The outer race 5a of the inner bearing is pressed into contact with each other, and an elastic body 9 that can be crushed or returned to its original state is interposed between the bearing presser 7 and the opening peripheral surface 6a of the fitting hole. It is characterized by becoming.

[Function] In the side clearance adjustment mechanism of the rotary vane pump of the present invention, against the elastic force of the elastic body 9 interposed between the bearing holder 7 and the opening peripheral surface 6a of the fitting hole of the side plate, Rotate the bolt 8 that screws the bearing retainer 7 to the opening peripheral surface 6a of the fitting hole of the side plate 4 in the forward and reverse directions, and then rotate the bearing retainer 7 and the side plate 4.
While crushing the elastic body 9 interposed between the opening peripheral surface 6a of the fitting hole to a predetermined thickness and returning it to the original state of a predetermined thickness, press it against the side surface of the outer race 5a of the bearing. Bearing presser 7 in contact
By moving the bearings 5 a predetermined distance back and forth parallel to the opening peripheral surface 6a of the fitting hole of the side plate 4, the position of the bearing 5 in the fitting hole 6 of the side plate on both sides of the casing 1 can be adjusted by moving back and forth. The rotor 3, whose shaft 3a is press-fitted and fixed into the inner race 5b of the bearing, is moved back and forth by a predetermined distance in the direction of the shaft 3a, and between the side surface of the rotor 3 and the inner surface of the side plate 4 facing the side surface. side clearance 10 can be adjusted.

Further, when adjusting the side clearance 10, even if the bolt 8 screwing the bearing retainer 7 to the opening peripheral surface 6a of the fitting hole of the side plate is rotated in the forward and reverse directions, the bolt 8 It does not loosen due to the elastic force of the elastic body 9 interposed between the opening surrounding surface 6a of the fitting hole and the bearing presser 7.

[Example] Next, an example of the present invention will be described with reference to the drawings.
FIG. 1 shows a preferred embodiment of the side clearance adjustment mechanism for a rotary vane pump of the present invention, FIG. 1 is a schematic structural explanatory diagram of a rotary vane pump equipped with the side clearance adjustment mechanism, and FIG. FIG. 3 is a front view of the surrounding surface of the opening of the fitting hole into which the bearing of the rotary vane pump is inserted, and FIG. 3 is an enlarged structural explanatory view of the vicinity of the elastic body of the rotary vane pump of FIG. The embodiment shown in the above figure will be described below. 20
The rotor 3, which has a plurality of vanes 2 fitted around the rotor 3, is made to freely rotate by bringing a part of its peripheral surface into slidable contact with the inner circumferential surface of the casing 1, and making it eccentrically inside the casing 1. It is a rotary vane pump. The side plates 4 on both sides of the casing 1 of the rotary vane pump 20 are provided with fitting holes 6 into which bearings 5 that directly support the rotor 3 are fitted.
Then, a bearing 5 that directly supports the rotor 3 is fitted into the side plate fitting hole 6 so as to be movable in the direction of the rotor axis 3a, and an inner race 5b of the bearing fitted into the fitting hole 6 is inserted. The shaft 3a of the rotor is press-fitted inside, and via the bearing 5,
A rotor shaft 3a is rotatably supported between side plates 4 on both sides of a casing 1. The rotor 3 housed in the casing 1 is rotatably supported by the side plates 4 on both sides of the casing 1 via bearings 5. Further, a spacer collar 11 is interposed around the rotor shaft 3a between the side surface of the rotor 3 and the side surface of the inner race 5b of the bearing. Further, a ring plate-shaped bearing presser 7 is provided, and the bearing presser 7 is used to hold the opening surrounding surface of the fitting hole of the side plate 4.
a and the side surface of the outer race 5a of the bearing fitted into the fitting hole, and several places around the bearing holder 7 are covered with the side plate 4.
Several bolts 8 are used to screw onto the peripheral surface 6a of the opening of the fitting hole to press the bearing retainer 7 against the side surface of the outer race 5a of the bearing in the fitting hole 6 of the side plate. In addition, as shown in FIG. 3, the area around each of the bolts 8 between the bearing retainer 7 and the opening peripheral surface 6a of the fitting hole of the side plate 4 has a structure that can be crushed or returned to its original state. A small diameter O-ring 9a, which is an elastic body 9, is loosely fitted. Furthermore, as shown in FIG. 2, a ring-shaped recess 12 is provided around each bolt hole 8a in which each of the bolts 8 is screwed on the opening peripheral surface 6a of the fitting hole of the side plate 4. A portion of each O-ring 9a loosely fitted around each bolt 8 along the inside of the recess 12 is fitted and fixed. Then, each O-ring 9a, which is an elastic body 9, is inserted between the bearing retainer 7 and the recess 20 of the opening peripheral surface 6a of the fitting hole of the side plate.
interpose between the inside and the inside. The rotary vane pump equipped with the side clearance adjustment mechanism of the present invention shown in FIGS. 1 to 3 has the above-mentioned configuration.

Next, its effect will be explained. Surface 6a surrounding the opening of the fitting hole between the bearing retainer 7 and the side plate
against the elastic force of each O-ring 9a, which is an elastic body interposed between the recess 12 of the Rotate each bolt 8, which is screwed on, in the forward and reverse directions. Then, the bolts 8 are loosely fitted around the openings 6a of the fitting holes of the bearing retainer 7 and the side plate 4 and the recesses 12.
By crushing each O-ring 9a interposed between the inside and the inside to a predetermined thickness or returning it to the original state of a predetermined thickness, the bearing retainer 7 is pressed against the surface surrounding the opening of the fitting hole of the side plate 4. 6a and move it a predetermined distance back and forth. Here, in order to move the bearing presser 7 back and forth in parallel with the opening peripheral surface 6a of the fitting hole of the side plate 4, the bearing presser 7
The inner surface periphery of the bearing presser 7 and the side plate 4 are connected to the recess 12 of the opening surrounding surface 6a of the fitting hole of the side plate 4.
After crushing each O-ring 9a, which is an elastic body 9 interposed between the inside and the inside, and once pressing it against the opening peripheral surface 6a of the fitting hole of the side plate 4, the bearing retainer 7 is pressed against the side plate 4. It is only necessary to rotate each bolt 8 screwed to the opening peripheral surface 6a of the fitting hole by the same rotation angle in the forward and reverse directions.
Then, the outer race 5a of the bearing whose side surface is pressed against the bearing retainer 7 is moved back and forth within the fitting hole 6 of the side plate, and the casing 1
The position of the bearing 5 fitted into the fitting hole 6 of both side plates is adjusted by moving it back and forth. Then, the rotor 3, whose shaft 3a is press-fitted into the inner race 5b of the bearing, is moved back and forth a predetermined distance in the direction of the shaft 3a, and the gap between the side surface of the rotor 3 and the inner surface of the side plate 4 facing the side surface is The side clearance 10 can be adjusted. Further, when adjusting the side clearance 10, even if each bolt 8 screwing the bearing retainer 7 to the opening peripheral surface 6a of the fitting hole of the side plate is rotated in the forward or reverse direction, the bolt 8 However, it does not loosen due to the elastic force of each O-ring 9a, which is an elastic body interposed between the opening peripheral surface 6a of the fitting hole and the bearing retainer 7.

In the above embodiment, the rotor shaft 3a is formed into a stepped structure or the like, so that the rotor shaft 3a is formed between the side surface of the rotor 3 and the side surface of the inner race 5b of the bearing.
The spacer collar 11 may not be provided around it.

Moreover, the recess 12 into which a part of the O-ring 9a is fitted and fixed is not provided around each bolt hole 8a in the opening surrounding surface 6a of the fitting hole of the side plate 4, and only the above-mentioned O-rings 8 are provided around each bolt 8. Each O-ring 9a, which is the elastic body 3, may be interposed between the bearing presser 7 and the opening peripheral surface 6a of the fitting hole of the side plate 4 by loosely fitting the ring 9a.

Further, the elastic body 9 which can be crushed and returned to its original state and is interposed between the bearing presser 7 and the opening peripheral surface 6a of the fitting hole of the side plate 4 may be a coil spring or the like.

Further, as shown in FIG. 4, along the opening peripheral surface 6a of the fitting hole of the side plate 4 to which the bearing retainer 7 is screwed, a large diameter A large-diameter O-ring, which is an elastic body 9, is inserted along the inside of the recess 12 between the bearing retainer 7 and the opening peripheral surface 6a of the fitting hole of the side plate 4. (not shown) is inserted and supported, and a large-diameter O-ring, which is an elastic body 9, is interposed between the bearing holder 7 and the opening peripheral surface 6a of the fitting hole of the side plate 4. You can do it like this.

[Effects of the invention] As explained above, in the side clearance adjustment mechanism of the rotary vane pump of the present invention, the bolts that screw the bearing retainer to the peripheral surface of the opening of the fitting hole of the side plate of the rotary vane pump are The bearing holder is rotated forward and backward against the elastic force of the elastic body interposed between the bearing holder and the surface surrounding the opening of the fitting hole of the side plate, and the bearing holder is pressed against the opening of the fitting hole of the side plate. By moving the bearing back and forth parallel to the peripheral surface of the rotor and adjusting the position of the bearing that directly supports the shaft of the rotor in the fitting hole of the side plate, the relationship between the end surface of the rotor and the inner surface of the side plate facing the end surface can be adjusted. You can adjust the side clearance between. Therefore, by rotating the bolt that screws the bearing retainer to the surface surrounding the opening of the fitting hole of the side plate in very small steps in the forward and reverse directions, the end face of the rotor and the inside of the side plate facing the end face can be rotated in very small steps in the forward and reverse directions. You can adjust the side clearance between the sides. In addition, in order to adjust the side clearance as in the past, it took a lot of effort to remove the bearing holder screwed to the surface around the opening of the fitting hole of the side plate. without changing etc.
Simply rotate the bolt that is screwed around the opening of the fitting hole of the bearing retainer side plate in the forward and reverse directions against the elastic force of the elastic body, quickly and easily. , it is possible to adjust the side clearance between the end surface of the rotor and the inner surface of the side plate facing the end surface.

In addition, if a rotary vane pump is manufactured using the side clearance adjustment mechanism of the present invention, the inner peripheral surface of the large-diameter fitting hole of the side plate into which the bearing that directly supports the rotor shaft is inserted will be It is no longer necessary to carve the female thread for inserting the male-threaded bearing retainer, which requires a large amount of time and large-scale equipment, which greatly simplifies and saves labor in manufacturing rotary vane pumps equipped with a side clearance adjustment mechanism. At the same time, there is no need for large-scale equipment for manufacturing rotary vane pumps.

[Brief explanation of the drawing]

Fig. 1 is a schematic structural explanatory diagram of a rotary vane pump equipped with the side clearance adjustment mechanism of the present invention, Fig. 2 is a front view of the surface surrounding the opening of the fitting hole of the rotary vane pump of Fig. 1, and Fig. 3 is a FIG. 1 is an enlarged structural explanatory view of the vicinity of the elastic body of the rotary vane pump, and FIG. 4 is a front view of the surrounding surface of the opening of the fitting hole of the rotary vane pump provided with another side clearance adjustment mechanism of the present invention. 2... Vane, 3... Rotor, 4... Side plate, 5... Bearing, 5a... Outer race,
5b... Inner race, 6... Fitting hole, 6a... Opening peripheral surface, 7... Bearing holder, 8... Bolt, 9... Elastic body, 9a... O-ring, 10...
Side clearance, 20... Rotating vane pump.

Claims (1)

[Scope of utility model registration request] In a rotary vane pump in which a rotor with vanes is rotatably supported in a casing by side plates on both sides of the casing via bearings, the bearings that support the rotor on the side plates are inserted into the fitting holes of the side plates. The bearing holder is fitted so as to be movable in the axial direction of the rotor, and integrally covers the surrounding surface of the opening of the fitting hole and the outside of the outer race of the bearing fitted into the fitting hole, and the bearing holder Use bolts to screw onto the surface surrounding the opening of the above-mentioned fitting hole,
A rotary vane pump comprising: the bearing holder pressed against the side surface of the outer race of the bearing in the fitting hole of the side plate; and an elastic body interposed between the bearing holder and the surface surrounding the opening of the fitting hole. Side clearance adjustment mechanism.