JP2004084565A - Vane pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vane pump capable of preventing a pump from producing vibration and abnormal noise by preventing a cam ring from being vibrated. <P>SOLUTION: An enlarged diameter part 10b is provided in the almost intermediate part of a pin 10. The diameter of this enlarged diameter part 10b is made larger than the inner diameter of the small diameter part H1 of a through hole H and smaller than the inner diameter of the large diameter part H2 of the through hole H. If the pin 10 provided with such enlarged diameter part 10b is inserted in the through hole H, the enlarged diameter part 10b is caught by a step part 11 formed on a boundary line between the small diameter part H1 and the large diameter part H2. The tip side insertion part 10a of the pin 10 is pressed in the insertion hole 3a of a side plate 3 with the step part 11 of a cam ring catching the enlarged diameter part 10b. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vane pump that positions a cam ring incorporated in a casing with a pin.
[0002]
[Prior art]
As shown in FIG. 2, a cam ring 4 is incorporated in a storage hole 2 formed in a casing 1. As shown in FIG. 3, a substantially elliptical ring hole 4a is formed in the cam ring 4, and a rotor 6 is rotatably incorporated in the ring hole 4a. The rotor 6 incorporates a plurality of vanes 7 that can freely project radially.
[0003]
A shaft hole 8 is formed in the rotor 6, and a shaft 9 is passed through the shaft hole 8. The shaft 9 is rotatably supported by the casing 1 so that the rotor 6 rotates with the rotation of the shaft 9.
In addition, as shown in FIG. 4, the side plate 3 is also incorporated in the storage hole 2 in which the cam ring 4, the rotor 6 and the vane 7 are incorporated as described above, while being in contact with the side surface of the cam ring 4. The side plate 3 and the cam ring 4 are connected by pins 5 and 5, as shown in FIGS. That is, through holes H, H are formed in the cam ring 4, while insertion holes 3 a, 3 a are formed in the side plate 3. The through holes H, H and the insertion holes 3a, 3a are aligned so that the pins 5, 5 are inserted into the holes. The position of the cam ring 4 with respect to the side plate 3 is determined by using such pins 5 and 5.
[0004]
Note that the storage hole 2 in which the cam ring 4 and the side plate 3 are incorporated is closed by a cover (not shown) fixed to the casing 1. The positions of the cam ring and the side plate 3 with respect to the cover are determined by inserting one ends of the pins 5 and 5 protruding from the cam ring 4 into holes formed in the cover.
[0005]
In such a vane pump, when the rotor 6 is rotated together with the shaft 9 by a drive source (not shown), the vane 7 projects from the rotor 6 by the centrifugal force. Then, the tip of the protruding vane 7 is pressed against the ring hole 4 a which is the inner wall of the cam ring 4, and a chamber is formed between the vanes 7. When the rotor 6 rotates with the tip of the vane 7 pressed against the ring hole 4a, the volume of the chamber formed between the vanes 7 changes sequentially. Then, when the rotor 6 is rotated in the direction of arrow k in FIG. 2, the working oil is sucked in the portion indicated by the dashed line S due to the expansion of the volume of the chamber. Further, in the portion indicated by the one-dot chain line T, the working oil is discharged by reducing the volume of the chamber.
[0006]
As described above, the cam ring 4 is positioned by the two pins 5, 5, and the through holes H, H into which the pins 5, 5 are inserted are usually formed with a diameter smaller than that of the pin 5, as shown in FIG. The small diameter portion H1 has a slightly larger inner diameter, and a large diameter portion H2 has a larger inner diameter than the small diameter portion H1. From the viewpoint of the positioning of the cam ring 4, the smaller the clearance between the through hole H and the pin 5, the better. This is because if the clearance between the pin 5 and the through hole H increases, the cam ring 4 rattles and the positioning accuracy with respect to the side plate 3 deteriorates.
[0007]
However, if the clearance is too small, it becomes difficult to insert the pin 5 into the through hole H. Particularly, when one end of the pin 5 is inserted into the insertion hole 3a formed in the side plate 3, if the pin 5 is slightly inclined, the pin 5 cannot be inserted. Therefore, a large diameter portion H2 is formed in the through hole H so that the pin 5 can be inserted into the through hole H even if the pin 5 is slightly inclined.
[0008]
[Problems to be solved by the invention]
In the above conventional example, the inside diameter of the small diameter portion H1 of the through hole H is slightly larger than the diameter of the pin 5 so that the efficiency of assembling the cam ring 4 is not deteriorated. Can not. Therefore, the cam ring 4 moves with respect to the side plate 3 during the operation by the amount of the clearance, which causes the cam ring 4 to vibrate, which causes a problem that vibration and abnormal noise of the pump occur. .
An object of the present invention is to provide a vane pump capable of preventing vibration of a pump and occurrence of abnormal noise by preventing vibration of a cam ring.
[0009]
[Means for Solving the Problems]
A first invention is a vane pump in which the position of a cam ring incorporated in a casing is positioned by a pin fixed to the casing. In the vane pump, a through hole for inserting the pin is formed in the cam ring, and a through hole is formed in an inner periphery of the through hole. While the step is provided, the pin is provided with a stopper which catches on the step when inserted into the through hole, and one end of the pin is inserted into the casing and fixed in a state where the stopper is hooked on the step. Then, the cam ring is pressed against the casing, and the cam ring and the casing are integrally connected.
[0010]
A second invention is a vane pump in which a cam ring and a side plate are incorporated in a casing, and a position of the cam ring is positioned by a pin fixed to the side plate. In the vane pump, a through hole for inserting the pin is formed in the cam ring. While a step is provided on the inner periphery of the through hole, the pin is provided with a stopper which catches on the step when inserted into the through hole, and the stopper is hooked on the step, and one end of the pin is provided. When the cam ring is inserted into the side plate and fixed, the cam ring is pressed against the side plate, and the cam ring and the casing are integrally connected.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
The embodiment of the present invention shown in FIG. 1 is characterized in that a large-diameter enlarged portion 10b is provided in a substantially intermediate portion of a pin 10, and a small-diameter portion provided in the through hole H of the cam ring 4 by the enlarged diameter portion 10b. It is characterized in that the step 11 is pressed between H1 and the large-diameter portion H2, and the other configuration is the same as that of the conventional example. Therefore, the following description focuses on the above features, and the same components as those in the related art are denoted by the same reference numerals as those in the related art, and detailed descriptions thereof are omitted.
[0012]
As shown in FIG. 1, an enlarged diameter portion 10b is provided at a substantially intermediate portion of the pin 10. The diameter of the enlarged diameter portion 10b is larger than the inner diameter of the small diameter portion H1 of the through hole H and smaller than the inner diameter of the large diameter portion H2 of the through hole H. When the pin 10 having such an enlarged diameter portion 10b is inserted into the through hole H, the enlarged diameter portion 10b is formed at the step 11 formed at the boundary between the small diameter portion H1 and the large diameter portion H2 of the through hole H. I'm trying to catch it.
[0013]
In this manner, the tip-side insertion portion 10a of the pin 10 is pressed into the insertion hole 3a of the side plate 3 with the step portion 11 of the cam ring hooked by the enlarged diameter portion 10b.
When the pin 10 is press-fitted into the side plate 3, the end face 12 of the enlarged-diameter portion 10 b is set at the step of the pin hole H before the tip of the pin 10 inserted into the through hole H comes into contact with the bottom of the insertion hole 3 a. It comes into contact with the part 11. That is, when the length of the distal end insertion portion 10a of the pin 10 is set to be shorter than the distance from the step portion 11 to the bottom surface of the insertion hole 3a, when the pin 10 is inserted into the through hole H, The enlarged diameter portion 10b is configured to be hooked on the step portion 11 of the hole H.
[0014]
As described above, the enlarged-diameter portions 10b, 10b of the pins 10, 10 are caught by the step 11, so that the tip-side insertion portions 10a of the pins 10, 10 project from the side surface 4c of the cam ring 4. The protruding portion is pressed into the insertion holes 3a, 3a of the side plate 3 until the cam ring 4 and the side plate 3 come into close contact with each other, so that the side surface 4c of the cam ring 4 is pressed against the side plate 3. When the side surface 4c of the cam ring 4 is strongly pressed against the side plate 3, the maximum static friction force of the contact surface increases, and the relative movement of the cam ring 4 with respect to the side plate 3 is restricted. That is, the cam ring 4 is firmly fixed to the side plate 3.
[0015]
On the other hand, the other end of the pin 10 is firmly fixed to an insertion hole of a cover (not shown) fixed to the casing 1. Therefore, the side plate 3 is firmly connected to the cover via the pin 10. Since the cam ring 4 is fixed to the side plate 3 firmly connected to the cover side as described above without rattling, the rattling of the cam ring 4 with respect to the side plate 3 is restricted.
According to this embodiment, since the cam ring 4 is securely fixed to the side plate 3 as described above, vibration of the cam ring 4 during operation can be prevented. Further, since the above-mentioned vibration can be prevented, it is possible to prevent vibration and abnormal noise of the pump caused by the vibration.
[0016]
In the above embodiment, the enlarged diameter portion 10b formed on the pin 10 constitutes the stopper portion of the present invention. However, if a portion of the pin 10 is hooked on the step portion 11, the stopper portion is enlarged. A structure other than the diameter portion 10b may be used. For example, a structure may be employed in which a convex portion is provided as a stopper portion on the outer periphery of the pin 10 and the convex portion is hooked on the step portion 11. However, if the enlarged diameter portion 10b is provided on the outer periphery of the pin 10 as in this embodiment, the pressing force acts on the entire circumference of the annular step portion 11, so that a stable pressing force can be applied to the cam ring 4. it can.
[0017]
Alternatively, the shape of the convex portion on the outer periphery of the pin 10 may be tapered so as to become thinner toward the tip, and the tapered convex portion may be hooked on the step portion 11 of the through hole H. In this case, the shape of the step 11 may be tapered. If the shape of the convex portion and the step portion 11 is tapered, the pressing force of the pin 10 acts not only on the cam ring 4 side but also toward the center of the pin 10. Therefore, a stable pressing force can be exerted on the pin 10, and the positional accuracy of the cam ring 4 with respect to the side plate 3 at the time of press-fitting can be improved.
[0018]
On the other hand, in this embodiment, the cam ring 4 is configured to be pressed against the side plate 3. However, in a vane pump of a type in which the cam ring 4 is brought into direct contact with the casing 1, the pins 10 are pressed into insertion holes formed in the casing 1. The cam ring 4 may be pressed against the casing 1. In the vane pump of the type in which the cam ring 4 is brought into contact with the cover, the pin 10 may be pressed into the insertion hole formed on the cover side to press the cam ring 4 against the cover. In any case, by using the pin 10 to press the cam ring 4 against another member that forms the pump volume chamber together with the cam ring 4, rattling of the cam ring 4 during operation of the pump can be prevented. Further, since the rattling can be prevented, it is possible to prevent the vibration and abnormal noise of the pump.
[0019]
Further, in this embodiment, the distal end side insertion portion 10a of the pin 10 is press-fitted into the insertion hole 3a to be fixed. However, a male screw is formed in the front end side insertion portion 10a, and a female screw is formed in the insertion hole 3a. The pins 10 and the insertion holes 3a may be screwed.
[0020]
【The invention's effect】
According to the first invention, a step is provided on the inner periphery of the through hole formed in the cam ring, while a pin inserted into the through hole is provided with a stopper which catches on the step, and this stopper is provided on the step. When one end of the pin is inserted into the casing and fixed in the hooked state, the cam ring is pressed against the casing, so that the cam ring can be securely fixed to the casing.
Therefore, vibration of the cam ring during operation can be prevented, and as a result, vibration and abnormal noise of the pump can be prevented.
[0021]
According to the second aspect, a step is provided on the inner periphery of the through hole formed in the cam ring, and a stopper inserted into the through hole is provided with a stopper which catches on the step, and the stopper is provided on the step. When one end of the pin is inserted into the casing and fixed in the hooked state, the cam ring is configured to be pressed against the side plate, so that the cam ring can be securely fixed to the side plate.
Therefore, vibration of the cam ring during operation can be prevented, and as a result, vibration and abnormal noise of the pump can be prevented.
[Brief description of the drawings]
FIG. 1 is a sectional view showing an embodiment of the present invention.
FIG. 2 is an explanatory view of a conventional vane pump with a cover removed.
FIG. 3 is an explanatory view showing a combined state of a cam ring 4 and a rotor 6;
FIG. 4 is a sectional view taken along line IV-IV of FIG. 3;
[Explanation of symbols]
H Through-hole 1 Casing 3 Side plate 4 Cam ring 4a Ring hole 6 Rotor 7 Vane 10 Pin 10a Tip insertion section 10b Stopper section 11 Step section 12 End face

Claims (2)

In a vane pump in which the position of a cam ring incorporated in a casing is positioned by a pin fixed to the casing, the cam ring has a through hole for inserting the pin, and a step portion is provided on the inner periphery of the through hole. The pin is provided with a stopper which catches on the step when inserted into the through-hole, and when this stopper is hooked on the step, one end of the pin is inserted into the casing and fixed. A vane pump, wherein the vane pump is configured to be pressed and the cam ring and the casing are integrally connected. In a vane pump in which a cam ring and a side plate are incorporated in a casing and the position of the cam ring is positioned by a pin fixed to the side plate, a through hole for inserting the pin is formed in the cam ring, and an inner periphery of the through hole is formed. On the other hand, the pin is provided with a stopper which catches on the step when inserted into the through hole, and one end of the pin is inserted into the side plate while the stopper is hooked on the step. The cam ring is pressed against the side plate when fixed to the side plate, and the cam ring and the casing are integrally connected.

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