300 results about "Engine valve" patented technology

The invention discloses a rocker arm assembly and an engine valve mechanism, and relates to the technical field of engines. The rocker arm assembly comprises a rocker arm, a first elastic piece, a sealing piece, an ejection unit, a piston and a transmission unit. A first cavity, a second cavity and a third cavity which are sequentially communicated are formed in the rocker arm, the ejection unit is installed in the first cavity, the first elastic piece and the sealing piece are both installed in the second cavity, the first elastic piece is connected with the sealing piece, the sealing piece is used for separating the first cavity from the second cavity, and a first oil channel is formed in the rocker arm. The first oil duct is communicated with the first cavity, the piston is installed in the third cavity and connected with the transmission unit, and the transmission unit is used for being matched with the delay cam. The rocker arm assembly is simple in structure, the number of parts is small, the occupied space is small, the production cost and the assembly cost can be effectively reduced, and economic benefits are improved.

The invention discloses an engine valve guide pipe and a preparation process and application thereof, the valve guide pipe is formed by plating a working surface of a Fe-based alloy matrix by adopting a magnetron sputtering process, and the Fe-based alloy matrix consists of C, N, Co, Cr, Ni, W, Ti, Mn, Al, Cu, V, S, Mo, Mg, Nb, Si, a toughening and cutting additive, a solid lubricant, hard particles and the balance of Fe. The valve guide pipe is prepared through the technological processes of additive preparation, burdening and powder mixing, mold wall lubricating, warm-pressing forming, sintering, siphon copper infiltration, heat treatment, finish machining and magnetron sputtering of the transition layer and the functional plating layer, has excellent hardness and strength and high compactness and further has good corrosion resistance, high-temperature wear resistance and good machining performance, and the service life of the valve guide pipe is prolonged. And the lubricating oil is suitable for working condition requirements including but not limited to hydrogen, natural gas, LPG gas, oil-gas hybrid power, fuel oil engines and the like in environments of high temperature, dry friction, impact, gas corrosion and the like.

The utility model relates to the technical field of engine valves, and discloses a valve rod end grinding machine which comprises a base, a clamping assembly is arranged above the base and comprises a bearing seat, the bearing seat is fixedly connected with the upper portion of the base, the front face and the rear face of the bearing seat are respectively and fixedly connected with two supporting plates, and the supporting plates are arranged on the bearing seat. A clamping plate is elastically connected to the faces, facing each other, of the two supporting plates through springs, the clamping plate is slidably connected with the upper portion of the bearing seat, a pressurizing assembly is arranged on the left side of the bearing seat and comprises a screw rod, the screw rod is rotatably connected with the left side of the bearing seat, and the outer surface of the screw rod is sleeved with a sliding seat in a threaded mode; the right side of the sliding seat is fixedly connected with two pressing strips. And the pressurizing assembly slides rightwards to enable the clamping assembly to clamp the engine valve rod, the engine valve rod can be clamped in the middle, and the effect of facilitating positioning for accurate grinding is achieved.

The present application discloses a method for calculating the amount of wear between an engine valve and a valve seat and a related device, and relates to the technical field of valve wear quantification. The method includes: establishing an impact wear model according to the influence of the impact angle when the exhaust valve is seated; and establishing a sliding wear model based on Archard wear theory; then respectively calling the impact wear model and the sliding wear model to calculate the normal impact wear, impact sliding wear and sliding wear; and calculating the total wear between the exhaust valve and the valve seat accordingly. The above scheme of the present application fully considers the various types of wear between the exhaust valve and the valve seat, such as specifically differentiating the impact wear into normal impact wear and tangential impact sliding wear, and also calculating the sliding wear after the valve is closed. Compared with the traditional scheme that only considers normal impact wear, the calculation result of the wear amount in the present application is more accurate, and the scheme of the present application is more in line with the actual situation.

The invention discloses a valve collet assembly pressing plate device of an automatic deviation rectifying spring, and relates to the technical field of engine valve collet assembly, the device comprises a lower pressing plate, a lower pressing plate, an upper pressing plate, an upper pressing plate, a lower pressing plate, an upper pressing plate and a lower pressing plate, and the lower pressing plate is provided with limiting grooves in one-to-one correspondence with valve rods on an air cylinder; the mounting groove is formed in the other side of the lower pressing plate and is correspondingly communicated with the limiting groove; when the lower pressing plate is attached to the air cylinder, a valve spring arranged outside the valve rod in a sleeving mode is located in the limiting groove. According to the valve collet assembling pressing plate device capable of automatically rectifying the spring, due to the fact that the lower pressing plate with the limiting groove is adopted to extrude the valve spring, the valve spring is limited in a narrow space, the technical problem that when an engine valve collet is installed, the valve spring is prone to dislocation is effectively solved, and the valve collet assembling pressing plate device capable of automatically rectifying the spring is simple in structure and convenient to use. Therefore, accurate press fitting of the valve springs is achieved, the press fitting fault that all the springs cannot be press-fitted in place at a time is eliminated, and the installation efficiency is effectively improved.

The invention discloses a method and system for improving engine transient response, a readable storage medium and a vehicle. The method comprises the steps that engine attribute boundary parameters are obtained, and an engine thermodynamic model framework is established; debugging a valve lift height, a valve wrap angle and a valve overlap angle in the engine thermodynamic model frame, and performing inflation efficiency verification on the engine thermodynamic model frame based on a debugging result; and carrying out high-performance valve lift rack verification and whole vehicle verification on the engine thermodynamic model frame based on an inflation efficiency verification result. The invention provides an engine valve lift forward design method. By designing a proper valve lift curve, the inflation efficiency of an engine body is improved, and higher air inflow is achieved under the same supercharger capacity. Meanwhile, due to the fact that the air inflow is increased, the rotating speed of the supercharger is increased, the capacity of the supercharger is indirectly improved, the transient response torque value of the engine is effectively increased, and the problem that the transient torque of the engine is insufficient is solved.

This invention provides an engine valve and a method for manufacturing the same, which can suppress galvanic corrosion even when dissimilar metals are joined, and which exhibits excellent wear resistance and corrosion resistance, for use in engines that use CNG, LPG, or alcohol as fuel. [Solution] The engine valve 10 of the present invention is a joint member in which a shaft portion 14 made of martensitic heat-resistant steel SUH11 and a umbrella portion 12 made of austenitic heat-resistant steel SUH35 are joined. A nitride layer is formed only on the surface of the base material on the shaft portion 14 side from the joint portion 13 between the shaft portion 14 and the umbrella portion 12, leaving the surface of the base material exposed on the umbrella portion 12 side from the joint portion 13.

A piston positioning mechanism includes a resilient retainer disposed in an annular groove on the outside of the piston, the resilient retainer engaging the wall of the bore of the piston to create a resistance to movement of the piston within the bore, the resistance to movement maintaining the piston in a retracted position within the bore, the retracted position being one in which the piston is clear of the engine valves. The embodiment eliminates the need for a conventional piston return spring, reduces the height of the piston mechanism, and reduces the opening oil pressure of the piston.

The utility model provides automatic installation device of engine valve, including valve feeding mechanism, adjusting mechanism and clamping mechanism. The device transports corresponding valve respectively through first conveyer and second conveyer who sets side by side, and places valve on first table board and second table board, to position and guide the transport of valve, and the second mechanical arm can simultaneously snatch the air inlet valve and the exhaust valve by taking and placing mechanism, and can snatch corresponding valve alone, and the cylinder cover is adjusted by the cooperation of lifting assembly and clamping turnover assembly, to control the installation position of the well adjusted cylinder cover, and the second mechanical arm is convenient for snatching valve and is installed fast, realizes the automation assembly of two kinds of valves.

A nitriding treatment tool belongs to the technical field of mechanical equipment and comprises a plurality of framework groups, a plurality of height adjusting parts and a plurality of connecting parts, each framework group comprises an upper framework, a lower framework, a plurality of connecting blocks and a placing net, the connecting blocks are positioned between the two frameworks and are fixedly connected with the frameworks, and the placing net is fixedly mounted in the frameworks. The frame sets are sequentially arranged from top to bottom, the connecting parts are fixedly connected with the frame sets, the height adjusting parts are located between every two vertically-adjacent frame sets and detachably connected with the connecting parts, the engine valve nitriding device is suitable for nitriding of engine valves, and the distance between the frames and the hole diameter of a containing net can be adjusted according to the sizes of other shaft parts and rod parts; the tool is suitable for nitriding machining of various parts, and the universality of the tool is improved; meanwhile, the number of the frame groups can be flexibly increased or decreased, small-batch multi-specification production can be met, large-batch centralized machining can be adapted, and the production flexibility and the large-scale requirement are both considered.

The utility model relates to the technical field of engine rocker arm braking, and discloses an engine rocker arm braking device which comprises a braking assembly installed in a rocker arm body, a containing groove and a braking groove are formed in the rocker arm body, the containing groove and the braking groove are communicated in a crossed mode, and a movable assembly is connected in the containing groove. One end of the movable assembly penetrates through the containing groove to abut against an engine valve, the brake assembly is located in the brake groove, one end of the brake assembly is connected with the movable assembly, and an oil groove is formed in the end, away from the containing groove, of the brake groove and connected with the brake assembly. According to the engine rocker arm braking device, the engine valve drives the braking assembly to move into the containing groove, so that braking is limited by the braking assembly, braking of the engine rocker arm is achieved, meanwhile, hydraulic thrust is provided through the oil groove, and the problem that braking cannot be relieved due to the fact that resistance at the joint of the braking assembly and the movable assembly is too large is solved; the braking assembly is stably driven, and then rocker arm braking is relieved.

When an engine controller determines that shutdown of an internal combustion engine has been requested, control of the engine shutdown of the internal combustion engine is effected, the internal combustion engine including a plurality of cylinders, and for each of the plurality of cylinders, a hydraulically controlled lost motion component is operatively connected to an engine valve corresponding to that cylinder. In response to the shutdown request, the engine controller initiates or continues a cylinder deactivation operation for each of at least one cylinder of the plurality of cylinders. Initiating or continuing the cylinder deactivation operation for each of the at least one cylinder includes: for an input of the hydraulically controlled lost motion component for each of at least one engine valve corresponding to the cylinder, the input is operated to provide the cylinder deactivation operation for a duration of at least long enough to complete shutdown of the internal combustion engine.

The utility model provides a gas detection tool for processing an engine valve chamber cover, which relates to the technical field of gas detection tools and comprises a water storage box, a guide rod is slidably mounted on the inner surface of the water storage box in a penetrating manner, a chassis is fixedly mounted at the lower end of the guide rod, and a reset spring is fixedly mounted on the upper surface of the chassis. The top end of the reset spring is arranged on the lower surface of the water storage box, the upper end of the guide rod is fixedly provided with a supporting plate, and the upper surface of the supporting plate is provided with a tool plate through a positioning assembly. The cover cap is placed on the upper surface of the supporting plate, and the output end of the hydraulic cylinder stretches out and draws back to drive the pressing plate to move downwards, so that the pressing plate is pressed on the upper surface of the cover cap; and meanwhile, the cover cap and the tool plate can be driven to move downwards at the same time, the cover cap is arranged in the water source, at the moment, the air pump works, the space between the cover cap and the tool plate is inflated, and when the cover cap leaks air, bubbles can appear on the water source, so that workers can observe conveniently.

The utility model relates to the field of valve machining devices, and discloses a motorcycle engine valve polishing and cleaning clamp which comprises an operation table, fixing frames are fixedly connected to the upper surface of the operation table, a sliding rod is fixedly connected between the fixing frames, and a plurality of sliding blocks are connected to the side wall of the sliding rod in a sliding mode. An electric push rod is fixedly connected to the lower surface of the sliding block on the right side, a fixing plate is fixedly connected to the side wall of the operation table, a first fixing block is fixedly connected to the upper surface of the fixing plate, the side wall of the sliding rod is fixedly connected to the interior of the first fixing block, and a second fixing block is fixedly connected to the upper surface of the fixing plate; the output end of the electric push rod is fixedly connected to the interior of the second fixing block. According to the air valve clamping device, the electric push rod is started to drive the right side sliding block to slide inwards, so that the rotating rod is driven to rotate, the connecting rod is driven to rotate, the left side sliding block synchronously moves inwards, the effect of clamping and fixing air valves of different sizes is achieved, and the practicability of the air valve clamping device is improved through the structure.

A cylinder deactivation system for an engine includes an engine block defining a cylinder. A valve opens and closes a port to the cylinder. The rocker arm pivots to operate the valve. The camshaft has a cam lift, and the cam-to-rocker input system transmits the cam lift to the valve through the rocker arm. A deactivation assembly is disposed in the rocker arm and responsive to fluid pressure to alternately achieve an activated state of the valve and a deactivated state of the valve.

The invention discloses a method for testing carbon deposition of a light automobile valve burning CNG on a rotary drum, and belongs to the technical field of whole automobile testing. The method comprises the following steps: S1, setting test parameters; s2, vehicle inspection; s3, starting a test; s4, checking the engine; s5, testing the vehicle; and S6, the steps S3-S5 are repeated until valve carbon deposition occurs in the engine, engine ECU electronic injection data are adjusted according to the emission and gas consumption test results and the acceleration test results, so that generation of the valve carbon deposition of the engine is reduced, and generation of the valve carbon deposition of the engine in the running process of an automobile combusting CNG is reduced as much as possible while the economic performance and the dynamic performance are guaranteed. According to the invention, the durability test is carried out on the drum of the CNG-fired vehicle, the carbon deposition condition of the valve is checked in stages, and the emission and gas consumption test and acceleration test are carried out on the tested vehicle. And by continuously correcting and adjusting electronic injection data of the ECU of the engine, carbon deposition of the valve of the engine is reduced, so that a series of problems of power reduction, gas consumption increase, even mechanical damage and the like of the CNG vehicle are reduced.

The invention aims to provide a dual-mode electromagnetic mechanical fully variable valve mechanism, and belongs to the field of engine valve devices. Comprising an electromagnetic driving device and a mechanical transmission device. The electromagnetic driving device can swing in a reciprocating mode and rotate in a whole-circle mode, when the electromagnetic driving device rotates in the whole-circle mode, an air valve molded line is similar to an air valve molded line of a cam shaft type air distribution mechanism, at the moment, frequent acceleration and deceleration of the electromagnetic driving device are not needed, and driving power consumption is low. When the electromagnetic driving device swings in a reciprocating mode, the molded line of the air valve is a trapezoid-like curve, and the maximum lift of the air valve is changed by adjusting the reciprocating swinging angle of the electromagnetic driving device. The fully-variable valve mechanism has the advantages of high response speed of electromagnetic drive and high reliability of a mechanical structure, and through cooperative work of the two modes, power consumption of the fully-variable valve mechanism is reduced while variable valve parameters of an engine are achieved.

The utility model relates to a vibration friction welding machine for machining an engine valve chamber cover, which comprises a machining table, a vibration head, a pressurizing cylinder, a first-stage forward moving seat, a second-stage forward moving seat and a locking device, the first-stage forward moving seat is positioned above the machining table, and the machining table is provided with a first-stage forward moving mechanism for driving the first-stage forward moving seat to move back and forth; the second-stage forward moving seat is located above the first-stage forward moving seat, the first-stage forward moving seat is provided with a second-stage forward moving mechanism for driving the second-stage forward moving seat to move front and back, a lower tool is arranged on the upper end face of the second-stage forward moving seat, and the lower tool is located in front of the operation window after the first-stage forward moving seat and the second-stage forward moving seat move forwards; the lower tool is located under the upper tool after the first-stage forward moving base and the second-stage forward moving base move backwards, and the locking device locks the position of the second-stage forward moving base when the vibration head conducts vibration friction welding. By the adoption of the scheme, the vibration friction welding machine for machining the engine valve chamber cover improves production efficiency and safety.

A rocker arm comprises a biasing contact surface configured to receive a force to bias the rocker toward a first engine valve. An actuator piston is slidably disposed in a vertical bore of the rocker arm, where the actuator piston and vertical bore are configured to align with the first engine valve. A hydraulic chamber is in fluid communication with the vertical bore, and a checking element is in fluid communication with the hydraulic chamber and configured to permit one-way passage of hydraulic fluid into the hydraulic chamber. A reset plunger is in sealing engagement with a reset plunger bore that is in fluid communication with the hydraulic chamber. The reset plunger has an end extending out of the rocker arm and configured to contact a reaction surface, thereby interrupting the sealing engagement of the reset plunger and permitting hydraulic fluid to vent out of the hydraulic chamber.

The utility model relates to the technical field of air valve machining, and discloses an engine air valve machining tool, which solves the problem that the existing machining tool is inconvenient to automatically feed and discharge air valves, and comprises an air valve feeding assembly, an air valve discharging assembly, an air valve continuous transferring assembly and an air valve positioning and clamping assembly, the valve continuous transferring assembly is fixedly connected to the interior of the valve positioning and clamping assembly, the valve positioning and clamping assembly is located between the valve feeding assembly and the valve discharging assembly, and the valve feeding assembly and the valve discharging assembly are each composed of a supporting frame, a conveying belt, a first servo motor and a plurality of first valve positioning supports. The valve continuous transferring assembly is composed of a strip-shaped shell, a second servo motor, a lead screw, a sliding block, a first air cylinder, an I-shaped support, two second valve positioning supports and two third valve positioning supports. By means of the machining tool, automatic feeding and discharging of the air valves can be achieved, and the machining efficiency is improved.

This internal combustion engine (1) has a hydraulically driven variable valve timing mechanism (8) capable of changing the valve timing of an engine valve. To change the valve timing of the engine valve, the internal combustion engine (1) temporarily increases the working hydraulic pressure supplied to the variable valve timing mechanism (8) to a target hydraulic pressure (Pt) at the time of switching. To change the valve timing of the engine valve, when the working hydraulic pressure becomes equal to or higher than a predetermined control-permission hydraulic pressure (Pc) lower than the target hydraulic pressure (Pt) at the time of switching, the internal combustion engine (1) starts control of the variable valve timing mechanism (8) to change the valve timing of the engine valve.

The utility model relates to the technical field of engines, in particular to an engine valve tappet layout structure which comprises a cam shaft arranged in an engine box body, tappets are arranged on the engine box body and correspond to two valve cams arranged on the cam shaft in pairs, the upper ends of the tappets are used for being connected with valve push rods, and the lower ends of the tappets are used for being connected with valve push rods. The upper ends of the valve push rods extend upwards and are arranged on a cylinder cover above an engine cylinder head; an oil pump is arranged on the engine box body and corresponds to a pressure supply cam arranged on the cam shaft, and the pressure supply cam is matched with the pressure supply end of the oil pump. The paired two valve cams are arranged at one end of the cam shaft, and the pressure supply cam is arranged at the other end of the cam shaft. The utility model has the characteristics that the structural design is simpler and more reasonable, the layout is more compact, and the working reliability can be improved.

A hollow engine valve 100 having a shaft portion 111 and a petal portion 113 which is expanded in diameter in an umbrella shape at a base end of the shaft portion 111, into which a cooling material is enclosed in a hollow portion 115 provided at least in the inside of the shaft portion 111, wherein the shaft portion 111 has a first shaft portion 111a on a tip end side, a second shaft portion 111b on a base end side which is larger in outer diameter than the first shaft portion 111a, and a step portion 111c which is formed by the difference in outer diameter between the first shaft portion 111a and the second shaft portion 111b, and the wall thickness t2 of the step portion 111c is thicker than the wall thickness t1 of the second shaft portion 111b.

A valve actuation system includes a first rocker arm assembly operatively connected to a first valve actuation motion source and connected to a first engine valve with a first lost motion component disposed in series between a first input rocker arm and a first output rocker arm. A second rocker arm assembly is operatively connected to a second valve actuation motion source and to a second engine valve, wherein a second lost motion component is disposed in series between the second input rocker arm and the second output rocker arm. The one-way coupling mechanism is arranged such that the second valve actuation motion is transmitted to the first output rocker arm but the first valve actuation motion is not transmitted to the second output rocker arm. Further, a primary hydraulic lash adjuster is configured in the second rocker arm assembly such that the primary hydraulic lash adjuster operates the first output rocker arm via a one-way coupling mechanism.

The utility model relates to the technical field of engines, and discloses a plane tappet, an engine valve mechanism, an engine system and a vehicle, the plane tappet comprises a base and a tappet body, the tappet body is located on the side, away from a contact face, of the base, and the top end of the tappet body is used for abutting against a push rod; an oil passing channel is formed in the plane tappet, a first opening and a second opening are formed in the two ends of the oil passing channel respectively, the first opening is located in the top end, and the second opening is located in the contact face. In the working process, engine oil flows to the top end of the tappet body, then flows into the oil passing channel through the first opening and finally flows out of the second opening. Therefore, due to the arrangement of the oil passing channel, it can be guaranteed that enough engine oil flows to the gap between the contact face and the cam shaft, the lubricating performance between the plane tappet and the cam shaft is improved, and then the working efficiency of an engine valve mechanism is improved.

The present invention discloses a valve lock clamp assembly pressure plate device for an automatic deviation-correcting spring, which relates to the technical field of engine valve lock clamp assembly. The device comprises: a lower pressure plate, on which a limiting groove is provided, which corresponds one-to-one with the valve stem on the cylinder; and a mounting groove, which is provided on the other side of the lower pressure plate and is correspondingly connected to the limiting groove; wherein, when the lower pressure plate is in contact with the cylinder, the valve spring sleeved on the outside of the valve stem is located in the limiting groove. The valve lock clamp assembly pressure plate device for an automatic deviation-correcting spring described in the present invention uses a lower pressure plate with a limiting groove to squeeze the valve spring, thereby confining the valve spring to a small space. Therefore, it effectively solves the technical problem that the valve spring is easily misaligned when installing the engine valve lock clamp, thereby achieving accurate press-fitting of the valve spring, eliminating the press-fitting failure that all springs cannot be pressed into place at one time, and effectively improving installation efficiency.

The utility model discloses a fixing tool facilitating quick drilling of oil holes in two ends of an engine valve rocker arm, which comprises a bottom plate, opening U-shaped grooves are arranged on two opposite sides of the bottom plate, a first clamping plate and a second clamping plate are arranged on the upper end face of the bottom plate, and a rocker arm placing area is formed between the first clamping plate and the second clamping plate. Pressing plates are arranged on the side walls, forming the rocker arm placing areas, of the first clamping plate and the second clamping plate correspondingly, a first positioning plate and a second positioning plate are arranged at the side wall ends, away from the pressing plates, of the first clamping plate and the second clamping plate correspondingly, a first air cylinder is installed on the first positioning plate, and a second air cylinder is installed on the second positioning plate; a piston rod of the first air cylinder is connected with the first clamping plate, and a piston rod of the second air cylinder is connected with the second clamping plate. Drilling of oil holes in the two ends of the rocker arm can be completed at a time, repeated disassembly and assembly are not needed, meanwhile, air cylinder jacking is adopted, operation is easy and labor is saved, the efficiency is improved by 2-4 times compared with a single-hole machining mode, and the production period is greatly shortened.

To provide a V-type eight-cylinder engine capable of suppressing lateral vibration of 1.5-order rotation without disturbing engine balancing design.SOLUTION: The V-type eight-cylinder engine includes eight cylinders arranged separately on left and right banks LB, RB, and the cylinders of each bank LB, RB are fired at unequal intervals. In the V-type eight-cylinder engine, left and right fuel pumps 9L, 9R provided on the left and right banks LB, RB are installed at an angle θp wider than an angle between engine valves arranged on both sides of the left and right banks LB, RB.SELECTED DRAWING: Figure 2

The utility model discloses an engine valve clearance combination tool belongs to frock technical field, solved the traditional method to rely on operator's experience and hand feeling, and the adjustment precision is difficult to guarantee and the operation complex and time -consuming problem. The engine valve clearance combination tool, including adjusting handle, adjusting wrench, both ends of adjusting handle are equipped with adjusting screw rod, the adjusting screw rod with adjusting handle between being equipped with conical body, the outer wall surface of adjusting handle both ends is hexagonal structure, adjusting wrench including ratchet sleeve, torque wrench, the detachable of ratchet sleeve installs one end at torque wrench, the upper portion of ratchet sleeve inner wall is equipped with with hexagonal structure's inner hexagonal structure, the lower portion of ratchet sleeve inner wall is equipped with with the outer wall surface of conical body's conical surface. The utility model discloses an engine valve clearance combination tool, effectively improves work efficiency and adjustment precision.

A valve actuation system comprises a first arm having a first arm contact surface and operatively connected to a valve actuation motion. A second arm having a second arm contact surface is operatively connected to the at least one engine valve. A discrete lost motion device is provided that is controllable between a first, motion conveying state and a second, motion absorbing state. The discrete lost motion devices comprises a plunger contact surface and a housing contact surface. The housing contact surface is configured to engage one of the first or second arm contact surfaces, and the plunger contact surface is configured to engage another of the first and the second arm contact surfaces. The first and second arm contact surfaces, the housing contact surface and the first plunger contact surface are configured to support the discrete lost motion device between the first arm and the second arm.