IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0499948
(2002-12-20)
|
우선권정보 |
FR-0016815 (2001-12-24) |
국제출원번호 |
PCT//FR02/04494
(2004-06-23)
|
§371/§102 date |
20040623
(20040623)
|
국제공개번호 |
WO03//056172
(2003-07-10)
|
발명자
/ 주소 |
- Allart, Bernard
- Bigo, Louis
|
출원인 / 주소 |
- Poclain Hydraulics Industrie
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
5 인용 특허 :
2 |
초록
▼
A hydraulic motor having radial pistons, and comprising a cam, a distributor, and a cylinder block whose cylinders are connected to communication orifices situated in a communication face of the cylinder block. The distributor has a distribution face in which distribution orifices open out that are
A hydraulic motor having radial pistons, and comprising a cam, a distributor, and a cylinder block whose cylinders are connected to communication orifices situated in a communication face of the cylinder block. The distributor has a distribution face in which distribution orifices open out that are suitable for communicating with the communication orifices while the cylinder block and the distributor are turning relative to each other. The cam is provided with a plurality of lobes, each of which has two ramps (50), each of which has a convex portion (51) and a concave portion (52). The edge of each distribution orifice has a leading portion (B1) via which communication between the distribution orifice and the communication orifices opens, and a trailing portion (B2) via which said communication closes. Each leading portion (B1) and each trailing portion (B2) of the edges of at least certain distribution orifices (21A, 23A) has an edge arrangement (53A; 53B) provided with at least one notch (54A; 54B), said edge arrangements of a distribution orifice being different depending on whether they are in angular correspondence with the convex region (51) or with the concave region (52) of the ramp of the cam.
대표청구항
▼
1. A hydraulic motor having radial pistons; and comprising a cam and a cylinder block that are suitable for turning relative to each other about an axis of rotation, the cylinder block having radial cylinders connected via cylinder ducts to communication orifices situated in a communication face of
1. A hydraulic motor having radial pistons; and comprising a cam and a cylinder block that are suitable for turning relative to each other about an axis of rotation, the cylinder block having radial cylinders connected via cylinder ducts to communication orifices situated in a communication face of the cylinder block that is perpendicular to the axis of rotation, pistons mounted to slide in the cylinders being suitable for co-operating with the cam, which cam is provided with a plurality of lobes, each of which has two ramps, each of which has a convex region and a concave region, the motor further comprising a fluid distributor having a distribution face that is perpendicular to the axis of rotation and that is suitable for being in abutment against the communication face of the cylinder block, said distribution face being provided with distribution orifices comprising orifices suitable for being connected to a fluid feed and orifices suitable for being connected to a fluid discharge, the fluid distributor being constrained to rotate with the cam, so that there is one ramp of the cam that corresponds to each distribution orifice, said distribution orifices being suitable for communicating one after another with the communication orifices while the cylinder block and the distributor are turning relative to each other, the edge of each distribution orifice having a leading portion via which communication between the distribution orifice and the communication orifices opens while the cylinder block and the distributor are turning relative to each other in a given direction of relative rotation, and a trailing portion via which communication between the distribution orifice and the communication orifices closes while the cylinder block and the distributor are turning relative to each other in said given direction of relative rotation, each leading portion and each trailing portion of the edges of at least certain distribution orifices having an edge arrangement provided with at least one notch, said edge arrangements of a distribution orifice being different, the edge arrangement of a distribution orifice which is disposed in angular correspondence with the convex region of the ramp of the cam corresponding to the distribution orifice in question being suitable for allowing a pressure-compensating volume of fluid to pass through between a communication orifice and the distribution orifice that is smaller than the pressure-compensating volume of fluid that is allowed to pass by the edge arrangement of the same distribution orifice that is disposed in angular correspondence with the concave region of said ramp.2. A motor according to claim 1, wherein for at least certain distribution orifices, the leading portion and the trailing portion have shapes that are substantially complementary to shapes of the edges of the communication orifices via which the communication between the distribution orifices and the communication orifices open.3. A motor according to claim 2, wherein for each distribution orifice, the leading portion and the trailing portion are substantially convex, as seen from the inside of the orifice.4. A hydraulic motor according to claim 1, wherein the edge arrangement of the leading portion of at least one distribution orifice is provided with at least one notch which, relative to a notch in the edge arrangement of the trailing portion of the edge of said distribution orifice is disposed at a different radial distance from the axis of rotation.5. A motor according to claim 4, wherein for the edge arrangements of at least one distribution orifice, the distance from a short notch to the axis of rotation is smaller than the distance from a long notch to the axis of rotation.6. A motor according to claim 1, wherein for at least one distribution orifice, the edge arrangement that is disposed in angular correspondence with the concave region of the ramp is provided with at least one notch which extends over an angular sector, as measured between two radii extending from the axis of rotation, that is larger than an angular sector, as measured in the same way, over which the notch which is disposed in angular correspondence with the convex region of said ramp extends.7. A motor according to claim 1, wherein for at least one distribution orifice, the edge arrangement which is disposed in angular correspondence with the concave region of the ramp has a notch section that is larger than the notch section of the edge arrangement that is disposed in angular correspondence with the convex region of said ramp.8. A motor according to claim 1, wherein each of the edge arrangements of at least one distribution orifice has the same number of notches, the notch or notches in one of the edge arrangements being different from the notch or notches in the other edge arrangement.9. A motor according to claim 1, wherein each of the edge arrangements of at least one distribution orifice has a similar notch or similar notches, the number of notches in one of the edge arrangements being different from the number of notches in the other edge arrangement.10. A motor according to claim 1, wherein two adjacent ramps of the cam are connected together either via a cam crest zone extending between their respective convex regions, or via a cam trough zone extending between their respective concave regions, said cam crest zone and said cam trough zone being substantially circular arcs centered on the axis of rotation, so that when the pistons are co-operating with said zones, radial strokes thereof are substantially zero, and the distribution orifices and the communication orifices having dimensions such that, while the cylinder block and the distributor are rotating relative to each other, each distribution orifice remains momentarily isolated from any communication orifice.11. A motor according to claim 10, wherein the cam crest zones extend over angular sectors, as each measured between two radii extending from the axis of rotation, that are smaller than angular sectors, as measured in the same way, over which the cam trough zones extend.12. A motor according to claim 1, having two active operating cubic capacities, namely a large cubic capacity in which each pair of consecutive distribution orifices comprises one orifice connected to the fluid feed, and one orifice connected to the fluid discharge, and a small cubic capacity in which certain pairs of consecutive distribution orifices are active and each of them comprises one orifice connected to the fluid feed and one orifice connected to the fluid discharge, whereas other pairs of distribution orifices are inactive and each of them comprises two orifices connected to the same pressure, only the edges of the distribution orifices of the pairs that are active in the small cubic capacity being provided with notches.13. A motor according to claim 1, having two active operating cubic capacities, namely a large cubic capacity in which each pair of consecutive distribution orifices comprises one orifice connected to the fluid feed and one orifice connected to the fluid discharge, and a small cubic capacity in which certain pairs of consecutive distribution orifices are active, and each of them comprises one orifice connected to the fluid feed and one orifice connected to the fluid discharge, whereas other pairs of distribution orifices are inactive, and each of them comprises two orifices connected to the same pressure, the edges of the distribution orifices of the pairs that are active in the small cubic capacity having edge arrangements that have notch sections that are larger than notch sections of the edge arrangements of the distribution orifice that are inactive in the small cubic capacity.
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