Expansible chamber devices – Relatively movable working members – Interconnected with common rotatable shaft
Patent
1997-08-14
2000-09-12
Denion, Thomas E.
Expansible chamber devices
Relatively movable working members
Interconnected with common rotatable shaft
92138, 92129, F01B 100
Patent
active
061161462
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a radial piston machine, in particular for automotive vehicle brake systems with wheel slip control and driving stability control.
BACKGROUND OF THE INVENTION
U.S. Pat. No. 2,324,291 discloses a radial piston machine including a star-shaped driving means on which radial pistons abut which are arranged like a star in the housing. The driving means is slipped onto stamp-like projections of the radial pistons to guide the radial pistons. This provides a positive clamping engagement of the piston stamps so that, on rotation of an eccentric gear arranged in the driving means, the movement of the driving means follows the movement of the eccentric. Due to the disclosed arrangement of the radial pistons on the driving means and the arrangement of the driving means with respect to the eccentric, a relative movement occurs between the contact surfaces of the piston stamps and the driving means which, due to friction on the contact surfaces and a tilting moment effect of the radial pistons in the housing, reduces the pump output and forces the driving means to clamp the pump stamps, which has adverse effects on the rigidity of the driving means.
British patent specification No. 763 095 discloses a driving means for a radial piston pump which, for the assembly, has a bipartite design in a radial direction and embraces the eccentric drive. The relative movement between the driver and the eccentric gear is ensured by a radial clearance which is configured as a sickle-shaped slot. The driver, which is hence composed of half shells, in terms of its material strength, must be dimensioned so that the tensile stress caused by screws can be taken up by the driver both mechanically and geometrically. Accordingly, the driver has a large and heavy construction. In addition, it can only be mounted in a radial direction because it is screwed with the piston.
OBJECT OF THE INVENTION
Therefore, an object of the present invention is to improve a radial piston machine of the above mentioned type so that the shortcomings known from the state of the art are overcome by means which are as simple as possible, inexpensive and reliable in operation.
SUMMARY OF THE INVENTION
According to the present invention, this object is achieved in that the driver has an oval outside contour in the direction of the piston axis and also has an oval opening, extending perpendicularly to the piston axis, exhibiting the radial clearance and accommodating the eccentric gear, and in that the driver, in the direction of the radial pistons, has extensions which include lateral recesses to accommodate the radial pistons.
A preferred constructive aspect of the driver can be seen in a sickle-shaped slot provided between the driver and the eccentric gear. The slot extends perpendicularly to the piston axis in the driver and corresponds to the peripheral course of the eccentric curve. The piston force introduced into the driver causes a constant variation of mechanical tension in the driver so that the introduction of force from the radial piston to the smallest cross-section of the driver occurs with an even rise in tension and without involving the risk of a critical, excessive tension in the smallest cross-section of the driver.
To ensure a reliable, form-locking attachment of the radial piston on the driver, the driver has a lateral recess so that the driver can be slipped from the side onto the end portion of the radial piston.
An especially simple possibility of attaching the radial piston on the driver is achieved by the fork-shaped opening of the driver proximite its extension, thereby providing a reliable and, nevertheless, simple positive engagement.
To perform the movement of the driver exclusively translatorily and synchronously with the translatory movement of the radial piston, the driver along with the radial piston is aligned without a clearance in the direction of the piston axis and with a clearance in a direction perpendicular to the piston axis. Low-noise and low-wear operation of
REFERENCES:
patent: 2324291 (1943-07-01), Dodge
patent: 2936632 (1960-05-01), Palmer
patent: 3000319 (1961-09-01), Tuck
patent: 4589329 (1986-05-01), Oberdorfer
patent: 4983100 (1991-01-01), Budecker
patent: 5573386 (1996-11-01), Schmitt et al.
Denion Thomas E.
ITT Manufacturing Enterprises Inc.
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