JPS60182364A - Follower controlling apparatus for variable volume pump - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a method in which an arbitrarily operable control slide valve body of a follow-up control device is slidably guided in a vertical hole of the follow-up slide valve body, and the follow-up slide valve body A follow-up control for variable displacement pumps that controls the pressure medium of a pressure chamber that accommodates a setting piston, the setting piston acts on a setting member that determines the stroke of the pump piston, and a sliding valve body follows the movement of the setting piston. Regarding the Iku device.

Problems with the Prior Art In such known devices, a vertical profile is formed on the outer periphery of the control sliding valve body, and a pinion operated by a setting lever engages with this vertical profile, thereby adjusting the control sliding valve body and therefore the discharge rate target. Set the value.

Such devices are expensive and require configuration (2) This is not necessarily effective as it causes difficulties.

Solution to hard points In order to eliminate these disadvantages, according to the invention, a control slide valve rests on a cam plate connected to the setting lever.

Effects of the Invention The follow-up control device according to the invention is very simple and the possibility of designing the cam plate provides a freely selectable relationship between the setting angle of the setting lever and the stroke movement of the control slide valve body. It has the advantage of

Advantageous developments and improvements of the features indicated in claim 1 are possible by means of the measures listed in the implementation section of the patent claims.

Embodiments of the invention are shown in the drawings and will be explained in detail below.

A vertical bore 11 is formed in the housing IO of the pump, into which a follow-up valve body 12 is slidably guided. A blind hole 13 extending vertically (3) is formed in this follower slide valve body 12, and a control slide valve body 14 is inserted into the blind hole 13 extending vertically (3).
is slidably guided. The control slide valve body 14 has an extension 15 which projects from the housing 10 and rests against a cam plate 16. Two narrow barbs 17, 18 are formed close to the center of the control slide valve body 14, and in the neutral position of the control slide valve body, these two
A hole 19 opens between 7 and 18 and leads to a passage 20 extending longitudinally through the compliant slide valve body 12. The control slide valve body 14 is formed with a lower collar 22, on which the compression spring 21 acts presses the extension 15 of the control slide valve body, which projects from the housing lO, against the cam plate 16. The inner end part 14' of the control slide valve body 14 enters into the narrowed part 11' of the longitudinal bore 11, and a passage 24, which is likewise formed in the follower slide valve body 12, leads from this part 11' into a transverse bore 25, which A lateral hole 25 opens into an annular groove 26 formed on the outer periphery of the follower sliding valve body 12 . This annular groove 26 leads to a hole 27 formed in the housing 10, from which a conduit 28 leads to the container 29(4).

A second annular groove 31 is formed on the outer periphery of the follower slide valve body 12 above the annular groove 26 , and a lateral hole 32 exiting from the blind hole 13 and formed in the follower slide valve body 12 opens into this annular groove 31 . There is. This annular groove 31 leads to a bore 33 formed in the housing 10, from which a conduit (not shown) leads to a pressure medium source supplying the necessary operating pressure.

A compression spring 34 is provided in the upper part of the vertical bore 11 and acts on the compliant slide valve body 12 to press its lower extension 35 against the bottom of the setting piston 36 . This setting piston 36 is slidably guided in a bore 37 in the pump housing,
The cam ring 38 is a setting member of the radial piston machine, and the cam ring 38 can be displaced by the setting piston 36 against a reaction force (not shown) in order to change the piston stroke. A clip ring 40 is provided at the bottom of the vertical hole 11, and a compression spring 41 supported by the clip ring 40 constantly presses the setting piston 36 against the cam ring 38. The compression spring 41 is located in a pressure space 39 in the area of the setting piston 36 (5).

FIG. 2 shows the tracking control device in a front view. The cam plate 16 has a seam plate 42 connected to a setting lever 43. This setting lever defines the target value of the pump discharge amount. The cam plate 16 can be designed in such a way that a freely selectable relationship between the swivel angle of the setting lever 43 and the stroke movement of the control slide valve body 14 occurs. For example, the cam plate can be designed in such a way that the pump can only change its displacement slightly in the first angular range, but only increases its stroke with a large oscillation.

This allows for sensitive starting when used for driving.

The tracking control device operates as follows. First, setting lever 4
3 is swung so that the control slide valve body 14 is moved downwards, ie towards the cam ring 38. This is possible because the extension 14' of the control slide valve body 14 has sufficient play within the major section 11'. The above movement connects the annular groove 31 and the lateral hole 32 to the upper part (6) of the 1f17 to the lateral hole 19 and the passage 20.

The pressure medium, now subject to the control pressure, flows into the pressure chamber 39;
The setting piston 36 is thereby subjected to pressure. The setting piston 36 displaces the cam ring 38 so that, for example, the piston stroke is reduced. The compression spring 34 moves the follow-up slide valve body 12 downwards so that the barbs 17,18 on the short-diameter control slide valve body 14 again break the connection to the transverse hole 19.

The desired settings are thereby made.

When the cam plate 16 is swung in such a way that the control slide valve body 14 is moved outwards, a connection is made from the transverse hole 19 to the transverse hole 25 and thus from the pressure chamber 39 via the channel 20 to the conduit 28 and the container 29. . The pressure chamber 39 is depressurized and the reaction force moves the cam ring 38 to increase the piston stroke. The follow-up slide valve body 12 is made to follow the setting piston 36 by means of the extension 35 always resting against the bottom of the setting piston 36, so that the connection from the transverse hole 19 to the annular groove 26 is again broken by the two flanges 17, 18; That is, the preselected delivery volume (7) is now obtained.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of the follow-up control device, and FIG. 2 is a front view thereof. 12... Follow-up sliding valve body, 14... Control sliding valve body, 1
6...Cam plate, 36...Setting piston, 38...
Setting member (cam ring), 43...setting lever. (8)

Claims (1)

[Claims] l An arbitrarily operable control sliding valve body (1
4) is slidably guided in the vertical hole (11) of the follower slide valve body (12), and the follower slide valve body (12) is inserted into the setting piston (
The setting piston (36) acts on a setting member (38) which determines the stroke of the pump piston, and the setting piston (36) acts on a setting member (38) which determines the stroke of the pump piston.
The sliding valve body (12) follows the movement of the cam plate (16) connected to the setting lever (43).
) is in contact with a control sliding valve body (14), a follow-up control device for a variable displacement pump. 2. The control sliding valve body (14) is hit by a compression spring (21) to bring the control sliding valve body (14) into contact with the cam plate (16). equipment. (1) 3 The compression spring (34) hits the follower slide valve body (12) and presses the follower slide valve body (12) against the setting piston (36). Equipment described in Section.