DE2433090A1 - MULTIPLE PUMP - Google Patents

Description

2433030;

H. . * ^{1 7 8} .

8th*. 7. 1974 Wd / We

Attachment to

Patent and

Usage pattern auxiliary registration

ROBERT BOSCH 6MBH. Stuttgart Multiple pump

The invention relates to a multiple pump with a coaxially arranged pump unit having a common drive shaft, of which at least the first pump unit is designed as a 'radial piston pump' ₉ which has pistons that perform lifting movements in a cylinder body in cylinder bores, which suck in pressure medium and push it out again,

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_ ₂ _ 2433598

where "at least the discharge takes place via a control unit, the first pump unit, which is designed as a radial piston pump, is designed as a cylindrical control pin on which the cylinder body rotates, according to patent .... (patent application P 2301 448.4).

It is an object of the invention to make a multiple pump of this type so .zu that the various pump units be driven in the simplest possible way.

This is done according to the invention in that the second pump unit as a radial piston pump with a the same control pin arranged, rotatably connected to the rotor of the first pump unit is designed rotor, and that a third pump unit is attached to these pump units is connected, which is driven by a shaft which penetrates the entire control pin and is connected to the drive shaft is.

In this way, a multiple pump is obtained which is very compact and whose drive is very simple.

An embodiment of the invention is shown in the drawing reproduced. This shows in

Figure 1 _e shows a longitudinal section through a multiple pump;

■ Pig.2a to 2e and

Yes up to 3e different cross-sections through the

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Control pin. - 3 -

The multiple pump has a central housing 10, which is supported on one side by a cover 11, on the other side is closed by a splash 12. In the central housing 10, a cylindrical cavity 13 is formed in which a double radial piston pump 14 is arranged. Furthermore, a central through hole 15 is formed in the housing 10.

In det, which opens into the cavity 13.! This hole is a

Control pin 16 fixedly arranged.

• The double radial piston pump 14 has a rotor 17, the has two adjacent rows of bores 18, 19 arranged in a star shape, in which pistons 20, 21 are sealed are slidably arranged. These are supported by sliding. shoes 22, 23 on a lifting ring arranged in the cavity 13 24 from. For the purpose of changing the stroke of the pistons 20, 21 in the cavity, the cam ring 24 can be eccentric with respect to the rotor moved \ verden. This is not shown in detail because it is well known.

The rotor is via a drive shaft 25 and a clutch disc 26 powered. The drive shaft 25 is mounted in a double ball bearing 27 of the cover 11.

In the control pin there are control openings 28 to 31 for the supply and discharge of pressure medium to and from the piston bores 18, 19. These control openings open into the

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Control pin formed longitudinal channels. Of which two designated by 32 and 33 can be seen from the drawing are. In the channel 32 formed in the housing 10 channels 34, 35 open, while in the channel is also in the housing 10 formed channel 36 opens. Via channel 36, from the double radial piston pump is sucked in pressure medium, which via the channels 34 and 35 to a consumer, not shown is promoted.

A through hole 37 is formed in the control pin * I6, which is penetrated by a shaft 38. This is rotatably mounted in a bore 39 of the drive shaft 25 and in a plain bearing 40 of the flange 12. The shaft 38 protrudes beyond the housing 10 and dips into a pump housing 41. This has a cavity 42 which is closed by a cover 43. In the cavity 43 is rotatably with A rotor 44 of a vane machine is arranged on the shaft 38, whose vanes, which are not visible and protruding from the rotor, are arranged slide on a cam ring 45 which can be adjusted eccentrically in the cavity 42 with respect to the rotor 44. Delivery and removal of Pressure medium to the vane pump takes place via bores 46 47 in the cover 43. The housing 41 of the vane pump is on the flange 12 is screwed on, while the flange 12 itself is in turn screwed to the housing 10. The control pin

as

16 can be cast or machined, i. H. bored Be trained part. Figures 2a to 2e show

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Sections through a control pin produced by casting in accordance with the sections Ha - Hc.

Figures 3a to 3e show a drilled control pin; The cuts are in the same places as the cuts Ha - Hc.

On-operation of the multiple pump is only briefly discussed, since in principle known and clearly ersichtlich.Wird the drive shaft 25 set in rotation, the rotor 17 is transmitted via the clutch 26 is also set into _rotation} and fixed for rotation with the drive shaft 25 connected Shaft 38 also drives the rotor 44 of the vane pump. The pistons 20, 21 suck in pressure medium via the channel 36 and the channels formed longitudinally in the control pin (see FIGS. 2a to 2e and 3a to 3e) and the control openings 30,31 in the outward stroke. . . When the pistons move inward, the pressure medium that is sucked in is conveyed to the channels 34, 35 via the control openings 28, 29 and the channels 32 running longitudinally in the control pin. Each of these channels is associated with a separate consumer. At the same time, the vane pump 41 also sucks in pressure medium through the bore 47 and conveys it via the bore 56 to a third consumption. This way you become multiple consumers

e.g.
supplied with pressure medium, 1 working cylinder and chassis as well

the slewing gear motor on a hydraulic excavator.

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2 1 - 6 -

It is essential that the maximum drive torque the adjustable vane pump is smaller than that of the double radial piston pump.

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509884/0228

Claims (6)

_ 7 - · ^{2 ί 7} Ρ Expectations 1 J multiple pump with coaxially arranged, one common Drive shaft "owning pump units, of which at least the first pump unit designed as a radial piston pump is, which has piston executing reciprocating movements in cylinder bores in a cylinder body, which Suck in pressure medium and push it out again, with at least the outflow taking place via a control element, which at the first pump unit designed as a radial piston pump is designed as a cylindrical control pin which the cylinder body rotates, according to patent - (patent application P 23 01 448.4), characterized in that the second pump unit (14) as a radial piston pump with a non-rotatably arranged on the same control pin (16) the rotor (17) of the other pump unit connected rotor is formed, and that on these pump units a third pump unit (4I) is connected by a the entire control pin penetrating, with the drive shaft (25) non-rotatably connected shaft (38) driven is. 2. Multiple pump according to claim 1, characterized in that the control pin (16) has a central through hole (37) has through which the shaft (38) extends, and that the with, shaft (38) via a spline toothing of the drive shaft ^ 25 \ is connected, and that the shaft (38) continues in one 509884/0228. JS - Bearing (40) one on the housing (10) of the double radial piston machine mounted flange part (12) 'is mounted. 3. Multiple pump according to one of claims 1 and / or 2, characterized in that the third pump unit is designed as a vane pump and that its maximum drive torque is smaller than that of the two radial piston pumps. 4. Multiple pump according to one of claims 1 to 3, characterized characterized in that the third pump unit is attached to the housing (10) of the double radial pump. 5. Multiple pump according to one of claims 1 to A-, characterized in that the control pin is designed as a precision casting with cast-in control openings and longitudinal channels. 6. Multiple pump according to one of claims 1 to 4, characterized characterized in that the control pin 16 is designed as a cast part with '.bored, longitudinal control channels, 509884/0228 Blank page