公开(公告)号：US20200247377A1

公开(公告)日：2020-08-06

申请号：US15774510

申请日：2016-12-09

Applicant: VHIT S.p.A.

Inventor： Leonardo Cadeddu

IPC: B60T11/21

Abstract: A pressure balancing system for a pair of tandem master cylinders. Each tandem master cylinder includes a primary plunger, a secondary plunger, a primary chamber, a secondary chamber and a secondary preload sub-assembly, comprising a secondary preload pin and a secondary preload case. The pressure balancing system comprises a primary balancing system and a secondary balancing system. The primary balancing system includes a primary balancing duct establishing communication of a primary balancing channel with the master cylinder at a region occupied by the secondary plunger when the latter is in an initial rest position, and a primary balancing O-ring forming a primary balancing valve between the primary balancing duct and the primary chamber. The secondary balancing system comprises a secondary balancing duct formed within the secondary preload pin and a second end ending with at least one radial hole, and a secondary balancing O-ring fixed to the secondary preload case.

公开(公告)号：US10532723B2

公开(公告)日：2020-01-14

申请号：US16064071

申请日：2016-12-07

Applicant: VHIT S.P.A.

Inventor： Leonardo Cadeddu

IPC: B60T13/14 ,  B60T11/236

Abstract: A hydraulic device for controlling braking for farm tractors, earthmovers and like machines, comprises a master cylinder and brake booster. A piston of the brake booster defines first and second chambers which, under rest conditions, are in communication and, during braking, are cut off with the first chamber being put in communication with a discharge chamber of the master cylinder. The piston of the master cylinder is driven by a drive piston shaped to define with a plunger of the piston of the brake booster a hollow space through which the first chamber communicates with either the second chamber or the discharge chamber, depending on device operating conditions. In the plunger, a seat for a gasket-valve is arranged to cooperate with the drive piston, during braking, to prevent fluid leakage between the second and the first chamber as a consequence of the sliding of the drive piston caused by braking.

公开(公告)号：US10449940B2

公开(公告)日：2019-10-22

申请号：US15754432

申请日：2016-09-02

Applicant: VHIT S.p.A.

Inventor： Leonardo Cadeddu

IPC: B60T13/14 ,  B60T7/12 ,  B60T13/24 ,  B60T13/38 ,  B60T15/38 ,  B60T15/42 ,  B60T17/04 ,  B60T17/22 ,  F15B7/08 ,  F16K31/122

Abstract: A pre-filling device for a braking system. The pre-filling device includes a pre-filling channel, a pre-filling pressure being inside the channel when the braking system is in a rest and hydro-boost position, and a mechanical valve configured to be opened following a transition from the rest and hydro-boost position to a working position of the braking system; and a hydraulic valve cooperating with the mechanical valve setting the pre-filling pressure inside the channel. The hydraulic valve includes in a first area, facing the mechanical valve, a hole communicating with the channel, and in a second area, hydraulically isolated from the first area, a preloaded resilient element in a chamber held at atmospheric pressure. The hydraulic valve is configured to be connected or not to be connected, by a reciprocating movement inside the channel, to a hydro-booster device and to keep a predetermined pre-filling pressure upon varying of the hydro-boost pressure.

公开(公告)号：US09765778B2

公开(公告)日：2017-09-19

申请号：US14386238

申请日：2013-03-13

Applicant: VHIT S.P.A.

Inventor： Leonardo Cadeddu ,  Matteo Cortesi

IPC: F03C4/00 ,  F04C21/00 ,  F04C23/00 ,  F04C9/00 ,  F04C14/18 ,  F04C28/18 ,  F04B49/08 ,  F04C14/22 ,  F04C11/00 ,  F04C15/00 ,  F04C2/344

CPC classification number: F04C14/223 ,  F04C2/3441 ,  F04C2/3442 ,  F04C11/006 ,  F04C15/0042

Abstract: A rotary positive displacement pump for fluids, in particular for the lubrication oil of a motor vehicle engine (60), has a displacement that can be regulated by means of the rotation of a stator ring (12) having an eccentric cavity (13) in which the rotor (15) of the pump (1) rotates. The stator ring (12) is configured as a multistage rotary piston for displacement regulation and is arranged to be directly driven by a fluid under pressure, in particular oil taken from a delivery side (19) of the pump or from a point of the lubrication circuit located downstream the oil filter (62). The invention also concerns a method of regulating the displacement of the pump (1) and a lubrication system for a motor vehicle engine in which the pump (1) is used.

公开(公告)号：US09404495B2

公开(公告)日：2016-08-02

申请号：US14386229

申请日：2013-03-13

Applicant: VHIT S.P.A.

Inventor： Leonardo Cadeddu

IPC: F03C2/00 ,  F03C4/00 ,  F04C2/00 ,  F04C14/22 ,  F04C18/344 ,  F04C18/356 ,  F04C2/344

CPC classification number: F04C14/226 ,  F04C2/3441 ,  F04C2/3446 ,  F04C14/223 ,  F04C18/3441 ,  F04C18/3446 ,  F04C18/3564

Abstract: A rotary positive displacement pump for fluids, in particular for the lubrication oil of a motor vehicle engine (60), has a displacement that can be regulated by the rotation of a stator ring (112) having an eccentric cavity (113) in which the rotor (15) of the pump (1) rotates. The stator ring (112) is located in an eccentric cavity (13) of an external ring (12), which is configured as a multistage rotary piston for displacement regulation and is arranged to be directly driven by a fluid under pressure, in particular oil taken from a delivery side (19) of the pump or from a point of the lubrication circuit located downstream of the oil filter (62). A method of regulating the displacement of the pump (1) and a lubrication system for the engine of a motor vehicle in which the pump (1) is used.

Abstract translation: 用于流体的旋转容积式泵，特别是用于机动车辆发动机（60）的润滑油的旋转容积式泵具有通过具有偏心腔（113）的定子环（112）的旋转来调节的位移，其中， 泵（1）的转子（15）旋转。 定子环（112）位于外环（12）的偏心腔（13）中，其被配置为用于位移调节的多级旋转活塞，并且被布置成由压力下的流体（特别是油）直接驱动 从泵的输送侧（19）或从位于油过滤器（62）下游的润滑回路的点取出。 一种调节泵（1）的位移的方法和用于其中使用泵（1）的机动车辆的发动机的润滑系统。

公开(公告)号：US20160195088A1

公开(公告)日：2016-07-07

申请号：US14436622

申请日：2013-10-21

Applicant: VHIT S.P.A.

Inventor： Matteo Cortesi ,  Luca Stagnoli ,  Joao Viviurka

IPC: F04C18/30 ,  F16J1/01

CPC classification number: F04C18/30 ,  F01C21/0809 ,  F04C2/3442 ,  F04C14/226 ,  F04C2240/20 ,  F05C2225/00 ,  F16J1/01

Abstract: In a vane rotor (1) for a rotary pump, each of the radial slots (4) housing the vanes (5) ends with a widened blind bottom (6) having a cross-sectional profile which is defined by a pair of first arcs (6a) arranged with facing concavities and having radially outer ends joined with a respective wall (4a) of the slot itself, and by a connecting portion (6b) connecting the radially inner ends of the first arcs (6a).

Abstract translation: 在用于旋转泵的叶片转子（1）中，容纳叶片（5）的每个径向槽（4）都带有一个加宽的盲底（6），其具有横截面轮廓，该横截面轮廓由一对第一弧形 （6a），其具有面对的凹部，并且具有与槽本身的相应壁（4a）接合的径向外端，以及连接第一弧（6a）的径向内端的连接部分（6b）。

公开(公告)号：US20150322944A1

公开(公告)日：2015-11-12

申请号：US14652927

申请日：2013-12-13

Applicant: VHIT S.P.A.

Inventor： Matteo CALDERONI ,  Leonardo CADEDDU

IPC: F04C14/22 ,  F04C15/00 ,  F04C2/344

CPC classification number: F01C21/106 ,  F04C2/344 ,  F04C14/223 ,  F04C15/0088 ,  F04C2240/50

Abstract: A variable displacement rotary vane pump for fluids is provided where displacement regulation is achieved thanks to the variation of the relative eccentricity between a regulation ring (11) in which a rotor (13) is arranged and the rotor itself. In a region of engagement between the external surface (11A) of the regulation ring (11) and the internal surface (40A) of a chamber (40) inside which the regulation ring (11) moves, a plurality of rolling elements (25), mounted in fixed position, is provided. The rolling elements (25) are provided only over a portion of such a region of engagement, including a zone (S) where a resultant of mechanical and fluidic forces generated in the pump during the regulation acts. A method of regulating the displacement of such a pump is also disclosed.

Abstract translation: 提供一种用于流体的可变排量旋转叶片泵，其中由于其中布置转子（13）的调节环（11）与转子本身之间的相对偏心度的变化而实现位移调节。 在调节环（11）的外表面（11A）与调节环（11）移动的室（40）的内表面（40A）之间的接合区域中，多个滚动元件（25） ，安装在固定位置。 滚动元件（25）仅设置在这种接合区域的一部分上，包括区域（S），在区域（S）中，在调节过程中在泵中产生的机械力和流体力产生的结果。 还公开了一种调节这种泵的排量的方法。

公开(公告)号：US20140341767A1

公开(公告)日：2014-11-20

申请号：US14351002

申请日：2012-10-10

Applicant: VHIT S.P.A.

Inventor： Antonio Crotti ,  Luciano Marchetti ,  Fabio Martello ,  Johannes Muellers

IPC: F04C29/02

CPC classification number: F04C29/02 ,  F04C18/344 ,  F04C25/02 ,  F04C27/009 ,  F04C2240/30 ,  F04C2240/54

Abstract: A rotary vacuum pump, for instance a vane pump, has at least one circumferential groove (6) between facing side surfaces of the rotor (2) and of the rotor guide (3) for receiving a lubricating and sealing fluid. The circumferential groove (6) is a partial annular groove, which has an angular extension of less than 360° and has at least one interruption enabling creating a hydrodynamic fluid bearing in a region opposite a discharge region of the pump (1; 101; 121; 201), over the whole axial extension of the facing surfaces. A method of lubricating a rotary vacuum pump is also provided.

Abstract translation: 旋转式真空泵（例如叶片泵）在转子（2）和转子导向件（3）的相对侧表面之间具有至少一个周向槽（6），用于容纳润滑和密封流体。 周向槽（6）是部分环形槽，其具有小于360°的角度延伸，并且具有至少一个中断，使得能够在与泵（1; 101; 121）的排放区域相对的区域中产生流体动力流体轴承 ; 201），在面对表面的整个轴向延伸。 还提供了一种润滑旋转真空泵的方法。