DE1937659A1 - Hydraulic high pressure pump or similar machine - Google Patents

Description

Hydraulic high pressure pump or similar machine The hydraulic High pressure pump or similar machine consists of a block in which in certain Angles to each other are arranged around the axis berum cylinder and the block in Rotation is displaced, furthermore from a manifold block, the two bean-shaped trained Has slots with which the cylinders alternate when the block kes rotates get in connection and a disc on which the piston rods of the cylinder The disk and the block are set in rotation, where the angle formed in front of the axis of the disc and the axis of the block in the way is adjustable that the stroke of the piston, i.e. the power of the pump or the similar machine is changeable.

According to one in the French patent specification of April 13, 1961 No. 1 311 140 described embodiment is the distribution block rotatably mounted on crank pins, which are arranged eccentrically to a surface are.

against which the face of the block rests, while the disc at an angle to it is firmly attached and the rods over joint in a plane This disc is mounted, which contains the axis of the crank pin. The block and the disc of the rods are rotatably connected to each other by a cardan shaft, what the power transmission provides. There is a disadvantage to this embodiment in that the supply and discharge lines to the manifold block are essential going through the crank pin measure what happens when pumps are working at high pressure represents difficult-to-solve problems of tightness.

Another one that occurs with this type of hydraulic machine Problem consists in the homokinetic transmission of the rotary motion between the Motor shaft and the block, as this transmission is accomplished by a cardan device which causes fluctuations in the instantaneous speed due to its construction.

The present invention aims to eliminate these drawbacks and seeks a hydraulic pump or motor operating at where pressure and characterized in that the dividing block is stationary, while the cytinder block is supported against the surface of the block and by a passing through the block axis is set in rotation and the disc is rotatable about a vertical axis in the Connecting plane of the rods is mounted, the inclination of this axis with respect to on the axis of the Blockee can be adjusted by rotating around an axis that corresponds to the first Axis is perpendicular and is in the connecting plane of the rods on the disc is located.

In this embodiment, the feed channels are the distributor look fixed, which eliminates the feeding problems caused by a co-rotating joint arise.

According to another feature of the invention, the connection takes place Rods with the joint disc by a constant velocity joint, which is carried by a shaft is guided away from the drive shaft of the block.

The constant velocity joint consists of a sleeve that rotates with is connected to the disc carrying the rods, the sleeve having three cylindrical, has recesses parallel to the axis and offset from one another by 120 ° and three spherically arranged cylindrical pin rollers which engage in the recesses and slidingly mounted on three radial pins offset from one another by 1200 which are carried by that of the wave.

Another feature of the invention is the angle connection of the shaft adjustable with respect to the drive shaft of the block.

Further features of the invention emerge from the description an embodiment, which is to be explained below with reference to schematic drawings.

Fig. 1 is an overall view, partly in section, of one according to the invention hydraulic pump; Fig. 2 is a detailed view of the components of the joint; Fig. Fig. 3 is a view in the direction III-III of Fig. 1; Fig. 4 is a perspective Illustration to explain the function of the constant velocity joint; Fig. 5 is an illustration for determining the center of rotation of the joint and FIG. 6 a representation for calculating the coordinates of the center of the joint and for Demonstration of the homokinetics of the device.

The hydraulic pump shown consists of a frame 1 made of welded parts on which an element is fastened with the help of screws 2 is because the La-3 ger 3 forms. The distribution block 4 is fitted into this bearing /. This divider block 4 has a surface perpendicular to the axis or the window Distribution slots 5, which via recessed lines 6, in the warehouse 3 and the Frame 1 recessed lines 7 and the lines 8 of on the Frame fastened block connections 9 with the suction and pressure lines of the pump stay in contact.

In the bearing 3 is rotatable and longitudinally through ball bearings 10 blocked the hollow drive shaft 11 mounted. The bearing is through a lid 12 protected, which ensures tightness in the oil circuit. The block 13 is sliding attached to the shaft, but rotatably connected to it by grooves and strips 14. It is under pressure by means of a spring 15 against the window of the distributor block held supported and is in a bore of the bearing 3 by a needle bearing 16 centered.

In the block 13, the cylinders 17 are formed in a known manner each have an opening, which alternates with bean-shaped during rotation formed suction and pressure slots 5 in connection with the rotation of the block reach. In the cylinders 17 are the pistons 18, each of which is articulated has a rod 19 mounted.

The other end of each rod 19 is articulated in one with the disc 21 connected ring 20 connected. As shown, the rods 19 are known in FIG Way inclined with respect to the axis, where by the radius of its connecting circle on the ring 20 Oberbalb of the eccentric radius of the cylinder 17 is located. The disk 21 is connected to a rotatably mounted support frame 22 titer a Abutment with conical rollers 23 and ball bearings 24 in a base piece 25. The base piece 25 is floating on pin 26 in the frame 1 so that the angle the axis of the support block 22 and the axis of the block 13 can be changed, to change the performance of the pump. The frame is covered by a protective housing 27 closed, which protects the rotating base piece 25.

The support block 22 is supported by a joint with three pins (see Fig. 1 and 2) driven, the one connected to the StUtsblock 22 and the disk 21 Has sleeve 28. This sleeve has three cylindrical ones, parallel to the axis and 1200 mutually offset recesses 29 in which spherically arranged Rollers 30 slide, which are mounted on the three pins 31 connected to the upper Part 32 of the joint are connected, which has a drive shaft 33 which is mounted in the hollow shaft 11. The shaft has 33 at its other end a toothing 34; the teeth can be in the corresponding grooves of part 35 of the engage hollow shaft 11. The part 35 carries flanges 36 sur connection with the Drive motor. The grooves of the part 35 and the corresponding teeth 94 have one easy.

Angular displacement, resulting in the displacement of the spline connection of the disc 21 allowed in besug on the block 13 and makes it possible to the rods 19 a slight forward inclination to give to the coupling transmitted by the joint to diminish.

It will be shown later that the tripod clutch is homokinetic and that the center of the tripods or the three cones describes a circle, its Radius is a function of the angle made by the axis of the disc 21 and the axis of the block 13 form, the Gesobwiadigkeit three times the speed of rotation the drive shaft is.

In Fig. 4, Z is the axis of the sole plate, Z 'the axis of the block and # the angle between these two axes. The plane of the ends of the tenons intersects the cylinder of the axes S of the cylindrical recesses of the coaxial sleeve Z according to an ellipse G2. The Oxy plane is the reference plane perpendicular to the axis OZ. The plane Ox'y 'is the plane perpendicular to the axis Z' containing the ellipse C '. This is the simple circle in the plane Oxy of that described by the S axes Cylinder.

If R is the radius of the circle a and oC is the angle of one of the radii which connect the center 0 on one of the axes S'1 of the cylindrical recesses of the sleeve with the axis Ox, then the following applies to the angles xOS'1, xOS '2, xOS'3, the said radius and the radii connecting the center 0 with the axes S'2 and S'3 of the two other cylindrical recesses, the following definition: xOS'1 = α sOS'2 = α + 2 # / 3 and xOS'3 = α + 2 # / 3 If the points of intersection of S'1, S'2 and S'3 with the ellipse C 'are denoted by E, F and G, then apply to the coordinates in the plane x'Oy 'of these three points the following relations: If you designate the center of the tripod with #, this point # is the point from which, according to the construction, you can see the three points E, F and G at an angle of y-. It can be shown that whatever these points are, there is always such a point.

If you look at point E in detail and if you look at the perpendicular in F and G referred to as EF and EG, eo the point # is the base point of the vertical from E to a straight line HJ, while H and J points on these perpendicular lines EF and EG where HEF and JEG = 300.

# And F are now on the same circle with the diameter EH and and G on the same circle with diameter EJ. This results in, that the angles E # F and E # G are 90 ° + 1/2 of the arc FH or GJ, i.e.

90 ° + 30 ° = 120 °.

Turning now to Figure 6, the construction of this point shows #, the circle C of FIG. 4 being moved to the level Ox'y '. The triangles EFH and EGH are homothetic and the relationships | EH | hold in them | EG | | FH | = and | FY | =.

73 73 Further, if i and j are the unit vectors on Ox and Oy and if a vector has V as components ai and bj, then the following relationships hold: V = ai + bj; V '(which is perpendicular to V to + # / 2) is equal to -bi + aj and V' ' (which is perpendicular to V 'to - # / 2) is equal to bi-aj.

To calculate the straight line HJ, first calculate the values OH and OJ OH is equal to OF + FH or there are 2 # sin (α +) - sin α 3 EF FH # + red - # / 2 = i # 3 # 3 2 # cos (α +) - cos α - j # 3 cos # 2 # cos (α +) sin (alpha; +) - sin α OH = + i cos # # 3 2 # cos (α +) - cos α 2 # 3 + # sin (α +) - # j # 3 cos # OJ is equal to OG + GJ or there are 2 # EG (sin (α-) - sinα # 3 GJ = + rot of # / 2 = - i # 3 # 3 2 # (cos (α- - cosα) + j # 3 cos 9 6 2 # 2 # cos (α-) sin (α-) - sinα OJ = # - # i cos (α-) - cosα 2 # 3 + # sin (α-) + #j # 3 cos # If HJ is determined by the angle ß it forms with Ox, then the tangent ß is equal to the projection of HJ onto Oy, ie if the projection of HJ onto Ox is equal to HJ = OJ = OH and the values above for OJ and OH are used, then 2 # cos (α-) - cosα 3 2 # 2 # + sin (α-) - sin (α +) # 3 cos # 3 3 2 # cos (α +) - cos α + tg ß = # 3 cos # 2 # 2 # 2 # cos (α-) sin (α-) - sin α cos (α +) cos # # 3 cos # 2 # sinα + - sinα # 3 N 'N # 3 cos # N 'One can set tg ß = = = DD' D '# 3 cos # The value of N' can be simplified in the following way: 2 # 2 # N '= cos (α-) - cosα + cos (α + ) - cosα + # 3 cos # #sin (α-) - sin (α-) # = - 3 cosα + # 3 cos # # - 2 cosαx # N '= - 3 cosα- 3 cos # cosα = - 3 ( 1 + cos #) cos α The value of D can be simplified in the following way: 2 # 2 # D '= # 3 # cos (α-) - cos (α +) # - cos # #sin (α-) + sin (α +) - 2 sinα # 3 3 = 3 sinα + + 3 cos 9 sinα = 3 (1 + cos e) sin resulting in 3 (1 + cos #) cosα cosα # = 3 (1 + cos #) sinα sinα Since the straight line E # is perpendicular to HJ t, is its 1 sinα angle coefficient - = = tgα; it is therefore paraltgß cosα lel su OM, which shows the homokinetics of transmission.

From which it follows that the coordinates of a point of the straight line E # are determined can be according to: y = x - + sinα cosα cos # and that of a point of the straight line HJ according to cosα cosα y = - x + Hx + Hy sinα sinα The point fl lies on these two straight lines, from which it follows that they are equated can, which results after the introduction of the values Hx and Hy cos (α + 2 # / 3) sin (α + 2 # / 3) - sinα Hx = + cos + cos # # 3 cos (α-) - cosα 2 # 3 Hy = sin (α +) - # 3 cos # The simplification results in 1 - cos # x # = - 1/2 cos α (cos²α - 3 sin² α) or 1 - cos # x # = - 1/2 cos3α cos # If you put this value of x in the equation above of the straight line E # feeds, we get for y # 1 - cos # y # = - 1/2 sinα (3cos²α - sin²α) or cos # 1 - cos # y # = - 1/2 sin 3 α cos # It follows that R is the radius of the circle C is that for the coordinates of the center of rotation of the tripod: 1- cos # x # = - R / 2 cos 3α cos # 1- cos # x # = - R / 2 sin 3α cos # From this it can be deduced that the center of the tripod is a circular line with the radius R (1 - cos #) describes with three times the speed of the drive.

Numerous modifications can be made to this embodiment without departing from the scope of the invention.

Claims (4)

P a t e n t a n s p r ü c h e 1. Hydraulic high pressure pump or similar machine, consisting of a block in which cylinders in certain directions to each other around the center point are arranged and the block rotates, as well as a distributor block, the two bean-shaped has formed slots with which the cylinder of the block in the course of their Rotation alternately connect and a disc on which the piston rods the piston of the cylinder are supported by joints and the disk and block rotate, characterized in that the distribution block (4) is fixedly arranged and block (13) held against the surface of the manifold block and by means of a through the The shaft (11) passing through the block is set in rotation, and the disc (21) is rotatable about an axis perpendicular to the connecting plane of the rods, the Inclination of this axis with respect to the axis of the block by rotation about an axis is adjustable, which is perpendicular to the first and in the connecting plane of the Rods on the disc, 2. Hydraulic high pressure pump according to claim 1, characterized characterized in that the transmission of the clutch to the disc (21) by a homokinetic tripod joint takes place, which is driven via a coaxial shaft (33) is. 3. Hydraulic high-pressure pump according to claim 2, characterized in that that the homokinetic ripode joint is formed by a sleeve (28) which is rotatable is connected to the disc (21) carrying the rods, the sleeve having three cylindrical, axially parallel and offset by 1200 recesses (29) and three spherical has arranged pin rollers (30) which engage in the recesses and slide are mounted on three radial pins (51) offset from one another by 120 °, which carried by the end of the shaft (33). 4. Hydraulic high pressure pump according to claims 2 and 3, characterized characterized in that the angular connection of the shaft (33) with respect to the drive shaft (11) of the block is adjustable. L e r s e i t e