JPS59180090A - Vane pump - Google Patents

Abstract

PURPOSE:To make the machining of a seal groove unnecessary and permit the sealing of a mating part as well as the appearance check of the incorporating condition of a seal plate by a method wherein the sealing plate, adhered with a seal ring on the inner peripheral side thereof, is pinched at the mating part between a housing and a cover plate. CONSTITUTION:The seal plate 35 is pinched at the mating part between the housing 1 and the cover plate 24. The sealing plate 35 is provided with a structure in which the seal ring 37, surrounding the annular recess of the housing 1, is adhered on the circumferential side of a thin plate 36 having an outer configuration substantially same as the outer configuration of the housing 1 at the mating part. The thin plate 36 is made of a thin steel plate and the seal ring 37 of rubber is vulcanized and adhered to the thin steel plate 36. According to this method, the mating part between the housing 1 and the cover plate 24 may be sealed without providing with the seal groove. On the other hand, the appearance check of the incorporated condition of the sealing plate 35 is permitted after assembling.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in vane pumps used as power sources for vehicle power steering systems and the like.

First, a conventional vane pump will be explained with reference to FIGS. 1 to 3. In the figure, reference numeral 1 denotes a housing that rotatably supports a drive shaft 4 by a bearing 2.3, and this housing 11 is formed with a concession-shaped recess 5 that is open at one end. A cam ring 7 that accommodates a splined rotor 6 is disposed at the front of the rotor. A plurality of vanes 8...8 are attached to the rotor 6 so as to be freely protrusive and retractable in substantially radial directions, and the tips of the vanes 8...8 are in sliding contact with the inner circumferential cam 7a of the cam ring 7, Working chambers 9...9 are formed between the matching vanes. This work chamber 9 is the rotor 6
The volume changes as the pump rotates, and two suction sections where the volume increases and two compression sections where each type decreases are formed.

Reference numeral 10 denotes a side plate, which is housed in the four beak-shaped portions 5 of the housing 1 in contact with one side of the cam ring 7, and forms a high-pressure chamber 11 for discharged oil within the arc-shaped recess 5. ing.

This site plate 10 is provided with a discharge boat 12 bored facing the discharge section of the work chamber 9 and a discharge passage 3 carried to the discharge boat 12, through which discharge oil is discharged. The entire layer of the side plate 10 is guided to the high pressure chamber 11, so that the side plate 10 is connected to the cam ring 7 by the discharge pressure in the high pressure chamber 11 and the spring force of the spring 14 disposed unevenly in the high pressure chamber 11. This side plate 10 is pressed to ensure oil-tightness in the working chamber 9. A plurality of through holes 15 are bored in the side plate 10, which are continuous in the circumferential direction and formed on the sliding surface with the rotor 6. The high pressure chamber 11 is connected to an annular groove 16 which is not connected to the rotor 6, and a part of the oil discharged from the high pressure chamber 11 is transferred to the plurality of vane slots 8a formed in the rotor 6 through the through hole 15 and the annular groove 16. It is guided to the base end portion and applies a force in a radial direction to the vanes 8 .

] 9 is a flow rate control valve, and this flow rate control valve 19 is provided between the high pressure passage 2o led from the pressure control chamber 11 and the low pressure passage 22 connected to the suction hole 21, and the flow rate control valve 19 Excess oil among the discharged oil is returned to the low pressure passage 22, and the discharge amount discharged from the discharge hole 23 is controlled to be constant.

24 is connected to the housing 1 by a bolt (not shown).
This cover plate 24 is attached to the housing 1 and closes the open end of the housing 1. The cover plate 24 includes a suction passage 25 connected to the low pressure passage 22, and a suction passage 25 connected to the low pressure passage 22.
A branch passage 27 is formed that branches off from the cam ring 7 and communicates with a suction boat 26 that opens facing the suction section of the working chamber 9.
It opens into a through passage 28 formed through the groove, and communicates with a suction boat (not shown) formed as a recess in the side plate 10 through this through passage 28, thereby allowing air to flow into the working chamber 9 from the left and right. They are inhaled at the same time to increase inhalation efficiency. Also, this cover plate 2
The sliding surface of the rotor 6 (!:) of 4 has the side plate mentioned above.
Similar to the case 10, a discharge boat 29 and an annular groove 30 that is not continuous in the circumferential direction are formed as depressions.

Note that the outer shape of the cover plate 24 is the same as that of the housing 1.
The outer shape is approximately the same as that of the housing 1 at the joint.

A seal ring 31 surrounding the annular recess 5 of the housing 1 and the low pressure passage 22 is provided at the joint between the housing 1 and the cover plate 24.
1 is housed in a seal groove 32 formed in the housing 1 to prevent leakage of hydraulic oil.

In addition, 33 is a seal 111 that seals the housing 1 and the sea bream driving shaft 4, 34 is a drive shaft, and a pulley connected to 4 by spline.

In such a configuration, by rotating the rotor 6 via the pulley 34 and the kA drive shaft by the engine or the like, the hydraulic oil stored in the reservoir (not shown) is transferred to the suction hole 21,
The oil is introduced into the chestnut harvesting chamber 9 through the low pressure passage 22, suction passage 25, branch passage 27, and suction port 26, and then the sucked oil is transferred to the discharge boats 12, 29, the high pressure chamber 11, and the flow weight control box 19. It is discharged from the discharge hole 23 through the discharge hole 23.

By the way, in such a conventional vane pump, since the joint between the housing 1 and the cover plate 24 is sealed with the seal ring 31 housed in the seal groove 32, the roughness of the seal groove 32 is reduced. If there is a problem, or if the seal ring 31 is not properly seated in the seal groove 32, there is a risk that a sufficient sealing effect will not be obtained. However, there is a drawback that it is not possible to visually check whether the seal ring 31 is correctly assembled after assembly.

Therefore, this invention makes it possible to eliminate the processing of seal grooves by sandwiching a seal plate with a seal ring adhered to the inner circumferential side at the joint between the nozzing and the cover plate. The purpose of the present invention is to obtain a vane pump that allows checking the correct assembly of a seal ring visually.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In addition, the same reference numerals are attached to the same components as in the prior art, and redundant explanation will be omitted.

FIGS. 4 and 5 are drawings showing an embodiment of the present invention. That is, a seal plate 35 is inserted between the housing 1 and the cover plate 24. As shown in FIG. 6, this seal plate 35 has a thin plate 36 which has approximately the same external shape as the housing 1 at the seam thereof.
A seal ring 37 that surrounds at least the annular recess of the housing (in this embodiment, it also surrounds the low-pressure communication passage 22 as in the conventional example) is bonded to the inner peripheral side of the housing, preferably a thin plate 36. is made of a thin steel plate, and a rubber seal ring is vulcanized and bonded to this plate.

The width W of the seal ring 36 is formed to be slightly larger than the thickness t of the thin plate 36, as shown in FIG. It is sandwiched between the two, and a sufficient sealing effect can be obtained.

With this configuration, there is no need to provide a seal groove.
The joint between the housing 1 and the cover plate 24 can be sealed with a seal plate 35. Furthermore, after assembling the vane pump, it is possible to check whether the seal plate 35 has been correctly assembled by observing the external appearance. Even if it is forgotten, it can be prevented from being shipped from the manufacturing warehouse by mistake, and the assembly of the seal plate 35 is inserted into the joint between the housing 1 and the cover plate 24. Since the work can be completed with just one step, the effect of making the assembly work easier can be obtained.

As explained above, according to the present invention, a seal plate with a seal ring layered on the inner circumferential side is sandwiched between the housing and the cover plate, thereby eliminating the need for seal groove processing, etc. The seam between the housing and the cover plate can be sealed. Since it is possible to visually check whether the seal plate is properly assembled after it has been assembled or folded, it is possible to prevent problems such as forgetting to assemble the seal plate.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional vane pump, Fig. 2 is a sectional view taken along the line 1-11 in Fig. 1, and Fig. 3 is a sectional view taken along the line 1-11 in Fig. 1.
Diagram Figure 4 is a cross-sectional view of a vane pump showing an embodiment of the present invention, Figure 5 is a cross-sectional view taken along the line v-v in Figure 4, Figure 6 is a front view of the seal plate, and Figure 7 is Figure 6. It is a sectional view taken along the line v■-■. DESCRIPTION OF SYMBOLS 1... Housing, 4... Drive shaft, 5... Annular recess, 6... Rotor, 7... Cam ring, 8... Vane,
9...Working room, 10...Side plate, 11...
- High pressure chamber, 24... cover plate, 35... seal plate. 0 methods

Claims (1)

[Scope of Claims] (1) A beak-shaped recess with an opening at one end is formed, and the vane is accommodated in the concession-like recess of the /1 uzzing, and a plurality of vanes can be freely projected and retracted in substantially radial directions. a cam ring that accommodates a rotor attached to the cam ring; a side plate that is in contact with one side of the cam ring and forms a pan pressure chamber for discharged oil within the annular recess of the cam ring; A sealing plate having a sealing ring surrounding at least the four annular parts of the above-mentioned above-mentioned above-mentioned above-mentioned above-mentioned above-mentioned above-mentioned above, is sandwiched between the joint between the above-mentioned No. Uji puffer fish and the Kakkuichi plate, and a sealing ring that surrounds at least the four annular portions of the above-mentioned No. A vane pump featuring C) The valve/pull according to claim 1, wherein the seal plate has a structure in which a rubber seal ring is vulcanized and bonded to a thin metal plate. (3) The vane pump according to claim 1 or 2, wherein the cylindrical plate is formed to have substantially the same external shape as the housing.