JPS58137677A - Rotary type direction changeover valve - Google Patents

Abstract

PURPOSE:To prevent generation of rotor-lock by a method wherein the outer peripheries of both ends of the rotor for a rotary type direction change-over valve and the inner periphery of a housing are contacted slidingly at a given interval while a switching hole at the inner periphery of the housing and a switching groove at the outer periphery of the rotor are located in a clearance formed therebetween. CONSTITUTION:The housing 2 of a valve is provided with four sets of switching holes 5-8 in the circumferential direction at the central part thereof while an oil sending pipe, a switching pipe and an oil discharging pipe are connected to the respective switching holes. Four sets of switching grooves 13-16 are provided on the outer periphery of the rotor so as to correspond to those switching holes while they are communicated by communicating holes 17, 18 which are not intersecting with the switching grooves located at the positions of point symmetry. The outer peripheries 3A, 3B of both ends of the rotor are contacting slidingly with the inner periphery 2A of the housing 2 in the intervals shown by notations 11, 12 and the outer periphery of the rotor is provided with a groove 3C to avoid the contact between the rotor and the housing while all of the switching holes and the switching grooves are provided in the interval of this groove.

Description

[Detailed description of the invention] The present invention relates to a rotary type directional control valve.

BACKGROUND ART Conventionally, there is a rotary type directional switching valve that has a plurality of switching grooves on the outer periphery and is configured to switch conduction between a plurality of switching holes opened on the inner periphery of the housing by a rotor rotating within the housing.

However, this conventional 1 m switching valve is formed so as to be able to come into sliding contact with the inner periphery of the housing over the entire axial section between both ends of the rotor, and the switching groove is formed on the same plane as the rotor outer station. A switching hole is opened on the same surface as the inner circumference of the housing.

In such a structure, when drilling a switching hole in the housing, distortion often occurs at the same edge of the switching hole on the inner circumferential side of the housing, and there are also many cases where there is a hole.
Distortion often occurs around the circumferential edge of the four-way switching groove during processing.

Under such conditions, in general, in rotary type directional control valves, it is almost impossible to completely balance the pressure of the working fluid acting on the rotor with respect to the center of the rotor due to wire machining. The rotor is pressed against the housing. In this case, the direction in which the rotor is pressed is
Depends on shape.

In such a state, if the switching hole opening part on the inner periphery of the rotor 0* is pressed against the rotor O switching groove, a very large 1 kli/turn torque is required to rotate the -1 rotor. It becomes necessary. Yigu, No Ujinda Inner Circumference FIjJ
There is a size in the switching hole - RO part of the middle rotor O switching groove, and a very large torque is required to rotate it all night.
This also causes problems such as K and A-tsuk.

In view of the above-mentioned drawbacks of the prior art, the present invention makes it possible to suppress the rotor rotational torque to a small level even when the rotor is pressed against the inner periphery of the housing due to the pressure of the working fluid, and to prevent the occurrence of drying. The purpose of the present invention is to provide a rotary type directional switching valve that can be used.

In order to achieve such an object, the present invention makes it possible to make sliding contact between the outer periphery of both ends of the roller and the inner periphery of the housing over a certain axial direction, and to make the outer periphery of both ends of the roller and the inner periphery of the housing slidable. By forming a gap in between to avoid contact between the outer circumference of the rotor and the inner circumference of the housing, and locating the rotor O switching groove and the O switching hole opening on the housing side within the axial section of the scissors gap, Avoid contacting the distorted parts and warps that occur around the opening of the switching hole O with the outer periphery of both ends of the rotor O and the inside of the Zonda to create a smooth Ii! It is characterized by being able to maintain a tactile layer state by itself.

The present @O embodiment will be described below with reference to ll1rIjJ.

FIG. 1 and Z'lJ Enlarged Figure 1 shows an embodiment of the present invention. 3
The housing 2 is fitted and fixed into the palladium die 4 by press fitting or the like.

The housing 2 has 4 O switching holes 5, 6° 7.8. .11 and an oil drain pipe 18, respectively. On the other hand, low IS
4 switching grooves 13 wide on the outer circumference # i 4 # i I
'# 1 are provided two by two in point symmetry with respect to the 4-30 rotation center OK, and switching grooves 1 which are point symmetrical with each other.
m and li and the switching grooves 14 and 16 are respectively the fitting holes 17.
Due to 11, we have been mad at each other for a long time.

The oil pipe [ζζ] is connected to the oil pressure pipe 19 via the oil pipe 19.
A relief valve 22 is provided between the oil supply pipe 19 and the tank 21. Further, the drain oil pipe 12 is connected to the tank 21 via a drain oil pipe 23. On the other hand, the switching pipe 10 is connected to the lower hydraulic chamber 25m of the piston 26 of the hydraulic cylinder 25 via the piping 24, and the switching pipe 11 is connected to the upper hydraulic chamber 251 of the cylinder 250 and the piston 26C via the piping 27. There is.

As shown in FIG. 2, one end of the housing 2 is closed with a side plate 28, and the other end of the housing 2 is closed with a motor housing 29. The rotor 3 is connected to a motor shaft (not shown) in a motor wheel ring 29 via a communication member 30.

The inside of the housing 2 is 112 mm wide, and is formed to have the same diameter over the entire axial length. On the other hand, the outer periphery 3mm and 3B at both ends of the rotor 30 are constant sections in the axial direction s, ns(ζ
Here Il;1. However, it is formed so that it can be slidably contacted in the direction of the inner circumference K11 of the housing 2 across the outer circumference 3 mm of both ends of the rotor 30,
3'l! A groove 3C is formed in the outer part of the 114O rotor in the horse direction, and the rotor 3
I between the rotor 3 and the housing 2 at the 0 connection between the housing 2 and the housing 2
A rather large gap 31 is formed to avoid contact.

The switching holes 5 to 8 of the housing 20 open to the inner wall of the housing 2 within the axial section of the ζ0 groove 3c. On the other hand, -1-tata SO cuts 13 to 16 are formed within this groove 3CO axially.

In the above embodiment KsI, if the rotor S is now in the angular position shown in FIG.
The inner O oil is force-fed to the oil feed pipe 11. Relief valve 2z adjusts the oil pressure to the specified value and drains the remaining oil by tank/2.
1nKR, the oil is transferred to the oil pipe 19 through the oil pipe 9, passes through the rotary type directional switching valve lo@switch hole S, enters the switching groove 13, and then flows from the switch 1113 to the switching hole 6 and the switching pipe 10. The lower hydraulic pressure 2IAK of the cylinder 2H flows through the piping 24, and the C cylinder 1 ton 36 is pushed upward as shown in FIG. ζ0 view, reshinme 250 upper oil pressure sensor 2s1 O oil tank, sequential piping 27, switching pipe 11. Switching hole 1
, the oil drain 14, the communication hole 18, the switching groove 16, the switching hole 8, the oil drain pipe 12, and the oil drain pipe 23 to the tank 21Kjl.

In this state, the oil flowing into the switching groove 13 passes through the communication hole 17 and fills the switching groove 15.

After that, the oil pressure acts on both the switching groove 13 and the ISO. In the case of , switching 11113. IS is processed so that it is point symmetrical with respect to the rotor 30 rotation center OK, but in reality it is impossible to make it completely point symmetrical, so the ninth step is to switch the rotor 3. The force due to the hydraulic pressure acting on the grooves 13 and 15 is different, and the rotor 3 is pressed against the inner circumference 2 of the housing on the upper or lower side in the figure.

However, the switching grooves 113 to 16 of the rotor 3 are formed on the outer periphery of the rotor 30 and are located within the axial section of the round groove 3c.
The openings of the switching holes 5 to 8 and the circle 31 are maintained. However, when machining the switching grooves 13 to 16 and the switching holes 5 to 8, the distortion generated on these 011 sides will not come into contact with each other and cause distortion, and this will reduce the influence of machining. Even if the outer ends of the rotor 3 that are not supported are rounded, where only the outer #1l13mm, 3]1 and the inner circumference 2mm of the housing are in contact, the rotor 3 is pressed against the inner periphery 2mm of the housing, and is rounded. , the rotor 3 slides smoothly within the housing 2. Therefore, the -30a turning torque can be small, and the -2 turn torque will not exceed.

The switching of the communication between the switching hole 5 and the sO is carried out by turning -Ito 3 to the 111th middle clockwise direction. That is, due to the rotational displacement of the stomach, the switching foramina and the
Seven is the switching groove 13. The switching holes 6 and 8 communicate via the switching groove 14.1@ and the communication hole 18. For this reason, Pudding/! $0 Upper hydraulic pressure 8s1
Oil is supplied to the engine, and the f-ston 26 descends.
In *alec, which is I, components similar to those in Figure 112 are numbered by adding 100 to the corresponding number.

In this embodiment, the sIP%fh Hiro, - one-way type directional switching valve 101011-ta xoso outside ^sha is formed to have the same diameter across the length in the axial direction, and has the same diameter at both ends of the rotor 103.
1103 mm, 10311 and housing 1020 inner circumference 10
2m is a constant section in the axial direction Nol, Noyuki (ζHere, jl=
jm), and a groove 102m is formed in the center direction in the inner horse 102m in the axial section between the outer shaft 1031 and 1031 at both ends of the rotor 1oso. 10! ]! A Kl1 interval 131 within the IO axial section is formed. There are four O switching grooves (here, only two switching grooves 114.11!!0 appear in the figure) and four switching holes (here, only two switching holes 107 and 108 appear in the figure). ) is located within the axial section of this gap 1310.

Therefore, in this embodiment KTh, the same O effect as in the ninth embodiment described above can be obtained.

1114 is a diagram illustrating still another embodiment of the present invention and FIG.
qaiom"C'sru.FigureKThl/%"C", happyzr
The ia*o structure elements and the ah*o structure elements are numbered by adding 200 to the corresponding numbers.

In this embodiment, the rotary type directional switching valve 201O
H-ta 2030 both ends outer circumference 203mm.

203BO axial direction constant section 1*el mushroom (here 1K-
1 snow), Rotor 203 and No. 1 Ujinda 20
Of the 20 pieces, 202 pieces can slide in the direction of the horse.
2G30 both ends outer circumference 11.

Between j1, a groove 203C is formed on the outer periphery of the cross section 203 in the central direction, and a groove 203C is formed on the outer circumference of the cross section 203 in the direction of the horse, and these grooves 203C,
20! A gap 231 is formed within the IO axial section. Each switching groove (here, only two O switching grooves 214° and 2150 are visible in the figure) is located within the axial section of the groove 203C, and each switching hole is located within the axial section of 1112021. (Here, only the two switching holes 207 and 208 Fi are shown in the figure.) are located. Note that although the axial lengths of the groove 203C and the groove 2011 are the same here, they may be slightly different.

In this embodiment as well, the same O effect as in the first embodiment can be obtained.

Although each embodiment has been described above, the present invention is not limited to the above embodiments, and, for example, the number and shape of the switching holes and switching grooves can be changed as appropriate.

As is clear from the above description, the present invention enables the outer periphery of both ends of the rotor and the inner periphery of the housing to be in contact with each other in the central direction at fixed intervals in the axial direction, and the distance between the outer periphery of both ends of the rotor and the inner periphery of the housing is A gap is formed between the inner periphery of the rotor and the inner periphery of the housing to avoid contact between the outer periphery of the rotor and the inner periphery of the housing, and within the axial section of the gap, an eleven-turn switching groove and an opening of the housing SO switching hole are formed. Since the housing O
Even if distortion or cracks may occur in the opening of the switching hole or in the vicinity of the rotor O switching groove, there is no possibility that the distorted portions or cracks will come into direct contact with the rotor at the connection. Therefore, even if the rotor is pressed against the inner periphery of the housing by the pressure of working fluid such as oil, there is a smooth surface between the outer periphery of both ends of the rotor and the inner part of the housing, which is not affected by the machining of holes or grooves. By being able to maintain the contact state (9), by being able to suppress the rotor O sticking torque to a small level, and (4) by being able to suppress the occurrence of O such as B and T.

[Brief explanation of the drawing]

The first panel is a partial cross-sectional diagram showing an example of applying the rotary carving direction switching valve to a hydraulic cylinder hydraulic cylinder according to the present invention, and the second panel is 0IIf for No. 111011111-1.
iIllI, the third garden is a 0*m diagram similar to the second cabinet showing another O embodiment of the present invention, and FIG. 4 is an 0IIFfWi diagram similar to the 1s2 diagram showing yet another O embodiment of the present invention. z,xol! O-housing, 2mm, 102mm. 202 mu naima, s, xos, gos-a-ta, 3mu*
311103mu, 10m11,203mu. 2031-Both ends outer circumference, 516.7.8, 107°19
8-Switching hole, 1114tls, 16el14°118,
! 14. ! I! -Switching groove, 3C, 102B. 20Z Island, 20ZC-Ju, 31,131,231-part.

Claims (1)

[Claims] A plurality of switching holes #4 opened on the inner periphery of L-A Kuzinda O
In a rotary type directional switching valve that is equipped with a plurality of OgJ switches on the outer periphery and is switched by a rotor that rotates within the housing, the outer periphery of both ends of the 1-torque and the inner periphery of the housing are each fixed in the axial direction. A large gap is formed between the outer periphery of both layers of the rotor O and the inner periphery of the housing to prevent contact between the outer rotor and the inner periphery of the housing, and A rotary type directional switching valve, wherein the switching groove and the switching hole O opening are located in an axial section between. λ The Qtr-shaped directional switching valve according to claim 1, characterized in that it is formed on the outer periphery of the rotor between the outer periphery of both ends of the four-tapered rotor. 2. The rotary type directional switching valve according to claim 1, wherein the lock is formed by a groove provided on the inner periphery of the housing between the outer peripheries of both ends of the rotor. 4. The rotary type directional switching valve according to claim 1, wherein the gap is formed by providing grooves on the outer circumference of the rotor between the outer circumferences of both ends of the rotor and on the inner circumference of the housing.