Abstract:
A cam follower, comprising: a tappet which includes two flanges provided with opposite holes centered on a transverse axis; a pin extending along the transverse axis between two opposite ends received in the opposite holes; and a roller movable in rotation relative to the pin around the transverse axis and adapted to roll on a cam. Each of the opposite holes is provided with: an open portion for mounting the pin by translation in a first direction perpendicular to the transverse axis, a cylindrical portion for supporting the pin along the first direction and a plane portion for retaining the pin along the transverse axis during transport and mounting of the cam follower. A method includes steps for manufacturing such a cam follower.
Abstract:
A switching roller finger follower including: a housing including first and second walls; a first secondary arm pivotably connected to the housing and including a first groove; a second secondary arm pivotably connected to the housing and including a second groove; and a roller disposed between the first and second walls and including an axle passing through the walls and having a first end disposed in the first groove and a second end disposed in the second groove. A method of fabricating a switching roller finger follower, including: disposing a roller between first and second walls for a housing; passing an axle through the roller and the walls; pivotably connecting first and second secondary arms to the housing; disposing a first end of the axle in a first groove in the first arm; and disposing a second end of the axle in a second groove in the second arm.
Abstract:
A mechanical system, comprising a support element having an outer surface adapted to slide in a housing receiving the mechanical system, a pin extending along a first axis and comprising two opposite ends, each adapted to be fitted in the support element for radial and/or axial retention of the pin relative to the first axis, and a roller element movable in rotation relative to the pin around the first axis. The mechanical system comprises at least one outer insert positioned at the outer surface of the support element. The mechanical system can be integrated into either an injection pump or a valve actuator.
Abstract:
A common rail fuel pump includes a cam shaft with at least one cam rotatably supported in a pump housing. A plurality of tappet assemblies are each reciprocatingly movable in the pump housing, and include an axle pin mounted in a tappet, and a roller mounted in contact for rotation about the axle pin. Each end of the roller includes a plurality of non-contiguous planar thrust surfaces separated by lubrication grooves. A lubrication pathway for the roller includes in sequence a lubrication passage that opens to a roller bearing surface, movement along the roller bearing surface into the lubrication grooves, and then between the planar thrust surface of the roller and a counterpart thrust face of the tappet responsive to rotation of the roller on the cam shaft.
Abstract:
The present invention may be used for vehicle engines having bores in which roller valve lifters reciprocate. A roller valve lifter may have a body with two opposed subtending spaced apart legs. A cam follower roller bearing having a press fit inner sleeve bushing may be rotatably mounted on the pin. Each of the legs may have an oil feed hole that traverses from an exterior surface to an interior surface adjacent to the inner sleeve bushing. The body in an upper portion may have a key device or an attached vertical guide bar to maintain proper orientation of the roller valve lifter to a cam lobe.
Abstract:
Provided is a cam follower apparatus that has excellent durability, assembly characteristics and freedom of design, and together with being able to reduce the size and weight, is able to reduce the manufacturing cost. Both end sections of a support shaft 3a are inserted into support holes 15b, 15c in support wall sections 12b, 12c, and the support shaft 3a is supported by the support wall sections 12b, 12c such that relative rotation is possible. An inner ring 16, having an outer diameter D16 that is greater then the inner diameter d15 of the support holes 15b, 15c, is fitted around the outer circumferential surface of the middle section in the axial direction of the support shaft 9a so as to be able to rotate together with the support shaft 9a. Moreover, a plurality of cylindrical rollers 13 are arranged between an inner-ring raceway 17, which is formed around the outer circumferential surface of the inner ring 16, and an outer-ring raceway 18, which is formed around the inner circumferential surface of a tappet roller 8b that is provided on the outer-diameter side of the inner ring, so as to be able to roll freely.
Abstract:
A tappet (1) for a high-pressure fuel pump having a housing (2), the drive input side (7), which serves as a cam run-on face. The housing (2) incorporates a roller (8), wherein the drive output side (3), which serves as a contact surface for a tappet follower part, of said housing (2) bears against an underside (4) of a bridge piece (6) which projects through an inner casing (5) of the housing (2), and a rotation prevention device (11) which projects beyond the outer casing (10) of the housing (2) extends in a window (9) of the housing (2). The rotation prevention device (11) is formed by a radial elongation of the bridge piece (6). A projection extends from the inner casing (5) of the tappet (1) only on a portion situated diametrically opposite the window (7), which projection is integrally connected and is produced by a punching and embossing process and rises in a wedge shape in a direction of the drive input side. The section (13) of the sheet-steel bridge piece (6) which is situated diametrically opposite the radial elongation (12) is snapped over the projection (15), and this section (13) rests with an edge region (14) of the underside (4) thereof on said projection (15).
Abstract:
The invention concerns a switchable lever (1) for a valve train of an internal combustion engine, said lever (1) comprising on one end (5), a bearing (6) for enabling a pivotal support of said lever (1) and, on another end (7), a support (9) for a gas exchange valve, a crossbar (2) of the lever (1) comprising a recess (10) comprising two cam rollers (11, 12) which are seated on an axle (15) mounted in bores (13, 14) of side walls (3, 4) of the lever (1) and displaceable in axial direction, a hollow axle (16) arranged on said axle (15) extending inwards out of the bore (13) of the first side wall (3), a first one of the cam rollers (11) being guided, axially fixed on said hollow axle (16) in front of an inner side (17) of the first side wall (3), said first cam roller (11) serving for a permanent contact of a first low lift cam (18) of a cam assembly (19), a second one of the cam rollers (12) being axially fixed on said axle (15) and being displaceable by said axle (15) into two positions, a first one of said positions serving to switch to a high valve lift during which the second cam roller (12) can be displaced through said axle (15) into a central position in the recess (10), so that a contact of a high lift cam (20) of the cam assembly (19) is enabled, a second one of said positions serving to switch off the high valve lift during which the second cam roller (12) can be displaced through the axle (15) into a position in front of the second side wall (4), so that a contact of a further low lift cam (21) of the cam assembly (19) is enabled.
Abstract:
A tappet (1) for a high-pressure fuel pump having a housing (2), the drive input side (7), which serves as a cam run-on face. The housing (2) incorporates a roller (8), wherein the drive output side (3), which serves as a contact surface for a tappet follower part, of said housing (2) bears against an underside (4) of a bridge piece (6) which projects through an inner casing (5) of the housing (2), and a rotation prevention device (11) which projects beyond the outer casing (10) of the housing (2) extends in a window (9) of the housing (2). The rotation prevention device (11) is formed by a radial elongation of the bridge piece (6). A projection extends from the inner casing (5) of the tappet (1) only on a portion situated diametrically opposite the window (7), which projection is integrally connected and is produced by a punching and embossing process and rises in a wedge shape in a direction of the drive input side. The section (13) of the sheet-steel bridge piece (6) which is situated diametrically opposite the radial elongation (12) is snapped over the projection (15), and this section (13) rests with an edge region (14) of the underside (4) thereof on said projection (15).
Abstract:
A variable valve system includes a transmission mechanism T which transmits a valve actuating force to an inlet valve 11 and which varies a maximum lift amount of the inlet valve 11 and biasing members 60. A sub-cam 40 oscillatably supported on a holder 30 driven by a control member 70 has a roller 43 contacting the inlet cam 15a, a drive cam portion 46 outputting the valve actuating force, and acting portions A contacting the biasing members 60. The acting portions A are provided in the vicinity of the roller 43 so that biased contact points 45a1, 45b1 are positioned nearer to a cam contact point 43a than an oscillation center line Ls and that an acting line L1 of a biasing force is superposed on the roller 43 as viewed in the direction of the oscillation center line Ls.