32 results about "Hydraulic tappet" patented technology

The utility model relates to the technical field of speed reducer maintenance, in particular to an oil slinger dismounting tool for a rolling mill gearbox, which comprises a three-section type fast-assembly clamp and a three-jaw type hydraulic puller, three holding arms of the fast-assembly clamp are matched to hold an oil slinger, the hydraulic puller is detachably screwed with connecting nuts on the three holding arms of the fast-assembly clamp through three long screw rods, and the three long screw rods are connected with the fast-assembly clamp. A hydraulic ejector rod is installed in the center of a triangular supporting frame of the hydraulic puller, and the hydraulic ejector rod coaxially abuts against the outer end face of the gear shaft and is used for applying force to pull the three holding arms and the oil slinger. Three replaceable hooping sleeves are correspondingly arranged on the inner sides of three embracing arms of the fast-assembling clamp, a C-shaped clamping groove used for clamping an oil slinger is formed in the inner side of each hooping sleeve, and the hooping sleeves are connected with the cambered surface T-shaped grooves in the inner sides of the embracing arms in a sliding and inserted mode through the cambered surface T-shaped tables of the connecting bases. According to the dismounting tool, the oil slinger is locked through the fast-assembling clamp, operation is fast and reliable, the dismounting tool can be switched to be suitable for oil slingers with different outer diameters, and the hydraulic puller enables drawing operation of the oil slinger to be labor-saving and safe.

The utility model provides a hydraulic tappet oil recharging device, which relates to the technical field of automobile accessory processing, and comprises a device body, a soaking pool is arranged on the top of the device body, a support frame is arranged on two sides of the top of the device body and above the soaking pool, and a plurality of hydraulic cylinders are arranged on the top of the support frame. A soaking pool is arranged in the supporting frame, a plurality of plug pins are arranged below the supporting frame and located above the soaking pool, a fixing base is arranged in the soaking pool, a plurality of fixing holes are formed in the top of the fixing base, fixing assemblies are arranged on the two sides of the interior of each fixing hole, and hydraulic tappet bodies are arranged in the fixing assemblies.

An engine assembly (12) comprising the following: an engine block (13) which defines within itself a combustion chamber (17) with a cylinder bore (15); a valve arrangement which is fluidically coupled to and actuated by the combustion chamber (17) in order to selectively introduce a fluid into or evacuate it from the combustion chamber (17); a piston (16) that can be moved back and forth in the cylinder bore (15); a crankshaft (11) which is rotatably mounted on the engine block (13) and is rotatable about a first axis; a multi-point linkage that connects the piston (16) to the crankshaft (11) for driving purposes and is rotatable about a second axis that is offset from the first axis; and a control shaft (104) rotatably mounted through the engine block (13) and rotatable on a third axis offset from the first and second axes, wherein the control shaft (104) is coupled to and actuated with the multi-point linkage to selectively rotate the multi-point linkage on the second axis, and the control shaft (104) is coupled to and actuated with the valve assembly to selectively open it, wherein a phasing device (124) is mounted inside the engine block (13) and connected to the control shaft (104), wherein the multi-point linkage has a linkage body (106) with a first, a second and a third pivot joint, wherein the first pivot joint (108A) is rotatably coupled to the piston (16), the second pivot joint (108B) is rotatably coupled to the crankshaft (11) and the third pivot joint (108C) is rotatably coupled to the control shaft (104), wherein the first pivot joint (108A) is rotatably coupled to the piston (16) via a connecting rod (21), the second pivot joint (108B) is rotatably coupled to a crankpin (110) of the crankshaft (11) via a rod bearing, and the third pivot joint (108C) is rotatably coupled to the control shaft (104) via a tie rod (112), wherein the control shaft (104) includes an eccentric cam (109) which projects radially outwards from a main shaft body, and wherein a first end of the connecting rod is rotatably coupled to the third pivot joint (108C) of the multi-point linkage to rotate about a fourth axis, and a second end of the connecting rod is rotatably coupled to the eccentric cam (107) to rotate about a fifth axis which is offset from the first, second and third axes, wherein the control shaft (104) has a roller cam (109) which projects radially outwards from a main shaft body, and wherein the valve assembly has a spring-loaded valve (18) which is fluidically coupled to the combustion chamber (17) and a pushrod (116) coupled to the roller cam (109). wherein the valve assembly further comprises a pivoting rocker arm assembly (120) and a hydraulic tappet (118), wherein the pivoting rocker arm assembly (120) has a first rocker arm (121) which rests against a stem of the spring-loaded valve (18), and a second rocker arm (123) which rests against a first end of the tappet (116), and wherein the hydraulic tappet is attached to a second end of the tappet (116) and is seated on the roller cam.

The application provides an engine valve train detection method, a hydraulic tappet device and electronic equipment. The method comprises the following steps: collecting a first torque set of a flywheel end of an engine when a hydraulic tappet is installed in the valve train of the engine, wherein the first torque set comprises torques collected under multiple engine operating conditions; collecting a second torque set of the flywheel end of the engine when a hydraulic tappet device is installed in the valve train of the engine after the hydraulic tappet is removed, wherein the valve train of the engine stops running after the hydraulic tappet is removed, the hydraulic tappet device is used to block an oil passage hole of a cylinder head oil passage of the engine, and the second torque set comprises torques collected under multiple engine operating conditions; and obtaining a detection result representing friction loss of the valve train of the engine according to a difference between torques under the same engine operating condition in the first torque set and the second torque set. Thus, the problem that the friction loss of the valve train of an entity cannot be detected can be solved.

The present application relates to the technical field of engine valve timing measurement, and discloses an engine valve timing measurement device, which comprises a driving mechanism and a measuring mechanism; the driving mechanism comprises a motor and a shaft coupling, the motor comprises an encoder, the output shaft of the motor is connected with the shaft coupling, and the shaft coupling is used for being connected with a crankshaft of an engine; the measuring mechanism comprises a base, a first displacement measuring device, a second displacement measuring device and a tappet component, and the first displacement measuring device is arranged on the base. The present application also discloses an engine valve timing measurement method, which comprises reading a first rotation angle alpha1 of the crankshaft when a piston actual top dead center is read by the encoder and a second rotation angle alpha2 of the crankshaft when a tappet lift is h, calculating a clamping angle beta of the crankshaft through the first rotation angle alpha1 and the second rotation angle alpha2, obtaining a rotation angle gamma of the crankshaft from a starting point of a valve lift m to a moving starting point of the tappet to the tappet lift h, and calculating a valve timing delta = beta-gamma. The present application does not need to replace the hydraulic tappet.

The utility model provides an anti-impact hydraulic tappet, and belongs to the technical field of automobile parts. The hydraulic tappet solves the problem that an existing hydraulic tappet is prone to generating noise when being impacted. The impact-resistant hydraulic tappet comprises a tappet shell, a mounting cavity is formed in the tappet shell, a plunger is arranged in the mounting cavity, guide grooves are symmetrically formed in the bottom of the mounting cavity, a supporting plate spring is clamped between the guide grooves, a sealing ball is arranged on the supporting plate spring, the top of the sealing ball abuts against the plunger, and an abutting arc embedded with the sealing ball is arranged at the bottom of the plunger. The shock-resistant and low-noise shock absorber has the advantages of being resistant to shock, low in noise and rapid in response.

The utility model relates to a kind of sleeve type double-piston structure and cylindrical hydraulic jack, including mutually sleeve setting upper plunger and lower plunger, the lower plunger is provided with upper oil cavity, lower oil cavity and the valve hole being communicated with the upper oil cavity and the lower oil cavity, the inside of the upper plunger is provided with upper plunger inner chamber, bottom is provided with bottom opening, the upper plunger is set in the upper oil cavity one side of the lower plunger outside, the position of the upper end opening of the upper oil cavity is higher than the bottom opening. Compared with prior art, the utility model has the advantages that: using the structure of upper plunger and lower plunger sleeve, not only facilitate the discharge of waste when plunger punching processing, but also can improve the oil storage volume of low pressure chamber.

To provide a control device for an internal combustion engine that can avoid generation of a closing failure in an exhaust valve even when a hydraulic oil for an engine that is supplied to a hydraulic lash adjuster (HLA) on an exhaust valve side has a low temperature and a high viscosity.SOLUTION: A control device for an internal combustion engine that performs catalyst warming-up by retarding ignition timing includes: a detector for detecting temperature of hydraulic oil that is supplied to an HLA on an exhaust valve side; an estimation unit for estimating viscosity of the hydraulic oil; and a restriction unit for restricting an amount of retard angle of the internal combustion engine on the basis of the temperature of hydraulic oil and the viscosity of the hydraulic oil.SELECTED DRAWING: Figure 1

The utility model provides a hydraulic tappet sinking and leaking experiment mechanical supercharging mechanism which is composed of a rack, a hydraulic cylinder body, a supercharging piston, a driving piston, a counterweight column, an air cylinder, an electromagnetic valve and the like, the hydraulic cylinder body and the air cylinder are installed on the rack, the supercharging piston and the driving piston are installed inside the hydraulic cylinder body, and the lower portion of the counterweight column is connected with the driving piston. The upper part is connected with the air cylinder through a T-shaped connecting body; the hydraulic cylinder body is of a double-cylinder communication structure, the upper part is a small-diameter master cylinder, the lower part is a large-diameter pressure cylinder, the master cylinder and the pressure cylinder are communicated through a middle communication hole, and gettering grooves are formed in the bottoms of the master cylinder and the pressure cylinder. According to different processes, the balance weight column can be replaced to be compatible with products of different specifications for experiments, the experiment pressure is constant, and experiment errors caused by pressure fluctuation of an air source can be effectively avoided.

The utility model discloses a safe hydraulic control device which comprises a base, a rotating seat is rotatably installed at the top of the inner side of the base, a hydraulic tappet is installed on the inner side of the rotating seat, the telescopic end of the hydraulic tappet is connected with a telescopic rod, a fixing column is welded to the top end of the telescopic rod, and the fixing column is connected with a hydraulic cylinder. According to the connecting device, the rod type connecting piece is connected to the inner sides of the two mounting connecting plates in a threaded mode, so that connection is completed, the mounting connecting plates are rotationally attached to the surface of a plate type device through the adjusting columns and the adjusting grooves, and therefore the plate type device can be conveniently mounted and dismounted. Then the screw rod can penetrate through the connecting groove to be connected with the plate type device, the connecting pin penetrates through the connecting groove and the used end to be inserted into the inner side of the connecting groove in the other end, and at the moment, the used end can rotate in the mounting connecting plate for use, so that the hydraulic tappet can meet different use requirements, the application range is widened, and the use efficiency is guaranteed.

The utility model provides a novel experimental valve mechanism which is composed of a base, a lower tool, an upper tool and a valve, and the valve is composed of a piston, a valve spring, a guide sleeve, a partition plate and a limiting screw. The base is installed on an external sliding table air cylinder, tappets are convenient to install and take, the lower tool, the air valve and the upper tool are sequentially installed in the base from bottom to top, and the cam is arranged over the base. A guide sleeve of the valve is installed in the center of the partition plate, a piston penetrates into the guide sleeve to compress a valve spring between the piston and the guide sleeve, and a limiting screw is installed at the bottom of the piston to enable the valve to form an assembly. According to the utility model, various experiments of mechanical tappets and hydraulic tappets can be satisfied, products with different outer diameters and different extension heights can be compatible through simple tool replacement, and the test fixture is suitable for design verification experiments of tappet products and later process improvement verification experiments.

The invention relates to a double-plunger sleeved type columnar hydraulic tappet which at least comprises a shell, an upper plunger, a lower plunger, a one-way valve mechanism and a return spring, the shell is provided with a plunger cavity and an oil inlet hole penetrating through the plunger cavity, the lower plunger is provided with an upper oil cavity and a lower oil cavity, the upper plunger is provided with an upper plunger inner cavity and a bottom opening, and the lower plunger is provided with a lower plunger inner cavity. The upper plunger is sleeved outside one side of the upper oil cavity of the lower plunger, the lower end of the upper plunger is provided with a first oil inlet channel communicated with the oil inlet hole, a second oil inlet channel communicated with the first oil inlet channel and the upper oil cavity is arranged between the upper plunger and the lower plunger, and the upper end opening of the upper oil cavity is higher than the first oil inlet channel. Compared with the prior art, the hydraulic tappet has the advantages that the structure that the upper plunger and the lower plunger are sleeved is adopted, the oil storage volume of the low-pressure cavity can be enlarged, the low-pressure cavity is provided with enough oil under the condition that the overall size of the hydraulic tappet is not changed, and therefore the risk that the valve clearance cannot be eliminated due to the fact that the hydraulic tappet is soft is avoided.

The invention relates to a test method for a low-temperature environment of a hydraulic tappet valve mechanism. The test method comprises the following steps: firstly, building a valve mechanism part test platform in a test room capable of simulating an extreme low-temperature environment; an engine cylinder cover is fixed on a test bench of a test platform, a camshaft timing gear is driven by a motor, and operation of a valve mechanism is simulated; a laser displacement sensor is used for measuring the valve lift corresponding to the hydraulic tappet, the valve lift and signals of the camshaft phase encoder are synchronously processed, and a valve lift curve is obtained; and respectively carrying out valve lift tests in normal-temperature and low-temperature environments, and comparing and analyzing the maximum lift difference of the valve so as to evaluate the working performance of the hydraulic tappet in the low-temperature environment. The test device has the advantages of controllable test period and environment elements and the like, the working environment after installation can be truly simulated, whether the hydraulic tappet can meet the low-temperature starting performance of the engine or not is evaluated, the test cost is saved, the test period is shortened, and advanced verification before the whole engine is examined is achieved.

The present application belongs to the technical field of rocker arm detection, and discloses a rocker arm lubrication pressure measuring device and a working method thereof. The device comprises an oil feeder, a pressure sensor and a fixing assembly. The fixing assembly comprises a base and a clamp. The clamp is installed on the base and is crimped on the rocker arm. A hydraulic tappet is arranged on the base and abuts against one side of an oil injection port of the rocker arm. A fixing column is further arranged on the side of the base away from the oil injection port and abuts against the lower side of the rocker arm. An oil pipe is arranged in the hydraulic tappet. The oil pipe communicates the oil injection port and the oil feeder. The pressure sensor is arranged in the oil pipe and can detect the oil pressure in the oil pipe. The device solves the problem that the rocker arm needs to be installed in the engine for lubrication pressure detection, resulting in complicated disassembly and assembly steps and low detection efficiency.

This utility model discloses a positioning fixture for assembling a hydraulic rocker arm in an engine, relating to the field of monolithic hydraulic rocker arms. The positioning fixture includes a support frame with multiple claws on both sides. The process involves placing the rocker arm assembly fixture onto the cylinder head, inserting a hydraulic tappet into the tappet hole in the cylinder head, then inserting the monolithic rocker arm along the claw slots until it precisely contacts the valve tip. The intake and exhaust camshafts are then assembled and fixed, ensuring the intake and exhaust camshafts press firmly against the monolithic rocker arm without wobbling. The monolithic rocker arm is correctly seated. Finally, the rocker arm assembly fixture is removed. At this point, the pad surface of the monolithic rocker arm and the valve maintain a precise centerline fit, preventing misalignment or dislodgement. This avoids situations where visual inspection reveals poor stability and prolonged operating time.

The invention discloses an engine valve timing measuring device and method based on pure machinery, and belongs to the technical field of internal combustion engine detection. The method is used for solving many problems in the engine valve timing measurement technology. The measuring rod tool is arranged in a spark plug hole of a cylinder cover, the measuring rod is installed on the measuring rod tool, the upper end and the lower end of the measuring rod make contact with the dial indicator and a piston top respectively to form a piston-measuring rod-dial indicator sensing chain mechanism, the dial is installed on the rear flange face of a crankshaft, and the turning transfer disc is installed on the dial. The method comprises the following steps: 1, constructing an initial measurement state; 2, measuring a top dead center; 3, a dial and a turning transfer disc are installed; and 4, measuring the opening and closing moments of the air valve. The non-linear influence of a hydraulic tappet is avoided through the rigid tappet, the top dead center is accurately positioned by means of a'piston-measuring rod-dial indicator 'sensing chain, the double-reference synchronization relation between the crankshaft angle and the valve displacement is constructed, accurate measurement of the valve opening / closing phase is achieved, and the measurement reliability and universality are improved.

The utility model relates to the technical field of measuring equipment, and discloses a hydraulic tappet performance test measuring tool which comprises a U-shaped base, a tappet body is installed in the U-shaped base, two parallel supporting rods are connected between the inner walls of the two sides of the U-shaped base, roller sleeves are connected to the outer sides of the two supporting rods respectively, the two roller sleeves are sleeved with the two supporting rods respectively, and the two supporting rods are connected with the tappet body. The two roller sleeves are rotationally connected with the two sides of the bottom of the tappet body correspondingly, the two ends of the top of the U-shaped base are both connected with lifting assemblies, a pressing roller is connected between the two lifting assemblies and abuts against the top of the tappet body, and one end of the pressing roller is connected with a driving motor. According to the measuring tool for the performance test of the hydraulic tappet, the hydraulic tappet can be accurately installed in the middle of the U-shaped base through the two supporting rods and the roller sleeve, the measuring precision of the hydraulic tappet is improved, the driving motor at the top is used for driving the rotating pressing roller, then the hydraulic tappet on the two supporting rods can be driven to conduct rotating measurement, installation is rapid and convenient, and the measuring tool is high in practicability. And the measurement precision is high.

The invention discloses a hydraulic tappet leak-down time testing device and method, and belongs to the field of diesel engine design. The hydraulic tappet leak-down time testing device comprises an actuator for outputting force to compress a hydraulic tappet; the control unit is used for obtaining pressure, temperature and displacement signals in the testing process, controlling an actuator to complete required actions, comparing and analyzing a testing result and a target value, judging whether a product is qualified or not, and outputting a pressure value, a leakage and sinking time value and a temperature value to an upper computer at the same time; and the upper computer records and displays the data uploaded by the control unit and is used for man-machine interaction to send an instruction to the control unit. According to the invention, the accurate test of the leakage and sinking time of the hydraulic tappet is completed, the test cost is saved, the test period is shortened, and advanced verification before whole engine examination is realized.

The utility model discloses a device for conveniently replacing a hydraulic tappet of an engine, relates to the technical field of dismounting devices, and aims to solve the technical problem that the dismounting efficiency of the hydraulic tappet is low. The device comprises a fixing piece and a jacking mechanism. The fixing piece is used for being connected with an engine cylinder cover. The jacking mechanism comprises a body and a jacking part, the body is connected with the fixing part, an adjusting hole is formed in the body, part of the jacking part penetrates through the adjusting hole, and one end of the jacking part extends out of the adjusting hole and can abut against the valve spring base; the length of the part, located between the body and the valve spring base, of the jacking piece is adjustable so that the gap between the valve spring base and the cam shaft can be adjusted.

The invention relates to an oil self-circulation columnar hydraulic tappet and an engine, at least comprising a shell, an upper plunger, a lower plunger, a one-way valve mechanism, a return spring and an oil drainage ring, the lower plunger is arranged at the bottom in the shell, and a low-pressure oil storage cavity is formed by the lower plunger and the inner wall of the shell; the one-way valve mechanism is arranged between the upper plunger and the lower plunger and communicated with the lower plunger, the return spring is arranged between the upper plunger and the one-way valve mechanism, a high-pressure oil storage cavity is formed among the upper plunger, the lower plunger and the inner wall of the shell, an upper oil hole and a lower oil hole are formed in the shell, and oil in the high-pressure oil storage cavity flows out through the oil drainage ring and the upper oil hole and then flows out through the oil drainage ring. And the oil flows back into the low-pressure oil storage cavity from the lower oil hole under the action of gravity. Compared with the prior art, the hydraulic system has the advantages that the high-pressure oil storage cavity is located above the low-pressure oil storage cavity, oil self-circulation is achieved, the oil return problem is solved, and the oil supply stability is improved; the low-pressure oil storage cavity is low in position, oil storage space can be expanded, and oil storage stability is improved.

The invention belongs to the technical field of medical auxiliary tools, particularly relates to a buffering and damping assembly, an anti-falling seat for an osteoporosis patient and a use method of the anti-falling seat, and aims to solve the problem that an existing active anti-falling seat generates rigid impact at the moment of triggering support and easily causes secondary injury to the osteoporosis patient. According to the seat, efficient buffering and damping are achieved through the buffering and damping assembly, the seat comprises an arc-shaped hydraulic cylinder, an arc-shaped rod body, a hydraulic tappet and a reset spring, and impact energy is converted into heat energy to be dissipated; the seat is further provided with a supporting structure, a protection structure and a driving structure, and an anti-falling protection mechanism is formed. The millimeter wave detection radar monitors gravity center shift of a patient in real time, the anti-roll bar is driven to unfold and support, and the L-shaped handrail synchronously moves upwards for protection; the seat further has intelligent monitoring and alarming functions, and an audible and visual alarm gives an alarm when the patient turns over on one side; the design of the sliding plate body and the blocking rod provides additional protection to prevent the patient from leaning forward and falling down; according to the seat, the safety and the comfort degree of the osteoporosis patient are improved.

The utility model relates to the technical field of punchers, and discloses a puncher for a hydraulic tappet, which comprises a base, a support column, a workbench and a clamping vice, the upper end of the support column is fixedly connected with a support table, the upper side of the support table is provided with a telescopic motor, the output end of the telescopic motor is fixedly connected with a telescopic rod, and the telescopic rod is fixedly connected with the workbench. The other end of the telescopic rod is fixedly connected with a fixing sleeve, and the inner wall of the fixing sleeve is fixedly connected with a connecting rod. A base, a supporting column, a workbench, a supporting table, a telescopic motor, a telescopic rod, a fixing sleeve, a connecting rod, a punching device and the like are arranged and used in cooperation. When drilling operation is carried out, a supporting rod in the punching device can be rotated to change the positions of a hole drilling drill bit and a punching drill bit below the rotating table, the hole drilling drill bit can be firstly used for drilling a hole, then the supporting rod is rotated to enable the punching drill bit to be located above a workpiece, then the punching operation can be carried out, and the drill bits do not need to be frequently disassembled and replaced; and therefore, the working efficiency is improved, and drilling operation is facilitated.

The invention relates to the technical field of tappet machining, in particular to hydraulic tappet machining equipment which comprises a clamping module, a conveying module and a grinding module are arranged in the clamping module, the clamping module comprises a shell, the shell is fixedly connected with a top plate, a connecting cylinder is arranged in the shell, and the connecting cylinder is rotationally connected with a second fixing cylinder fixedly connected with the shell. The connecting cylinder is fixedly connected with a plurality of first fixing blocks and a plurality of second fixing blocks, and the first fixing blocks are rotationally connected with rotating rods. According to the hydraulic tappet polishing device, a limiting ring is arranged through a connecting shaft, the connecting shaft can rotate relative to a connecting cylinder, a U-shaped block is pushed to move towards the connecting cylinder through a first arc-shaped section of the connecting shaft, a first clamping rod and a second clamping rod abut against and clamp a hydraulic tappet, then the hydraulic tappet is polished through a polishing module, and in the process of clamping and loosening the hydraulic tappet, the hydraulic tappet is polished through a polishing module; and other hydraulic tappets can be continuously polished through the polishing module, and continuous polishing of the hydraulic tappets in batches is facilitated.

The invention discloses a hydraulic tappet reliability test device and test method, and belongs to the field of diesel engine design, and the method comprises the steps: based on a single valve system of a valve mechanism, considering the tension bending deformation in the lift direction, and enabling each part to have one degree of freedom, namely the motion direction along the valve lift; comprising a simulation unit which provides an operation working condition which is close to the real condition of an engine for a valve mechanism, simulates the speed, cooling and lubrication under the real working condition, enables a hydraulic tappet to bear tight driving and gapless operation of a cam shaft all the time, and automatically compensates a gap between a rocker arm and the top end of a valve rod as a rigid fulcrum of motion of the rocker arm; and the data acquisition unit is provided with a plurality of sensors, realizes data acquisition and feeds back to the control unit. The running state of the high-power-density diesel engine at the constant maximum rotating speed is simulated, the reliability, abrasion and other performance of the hydraulic tappet are judged through long-time high-speed high-load running, and the accuracy is high.

This utility model relates to the technical field of automotive ball joint fatigue testing devices, specifically a comprehensive fatigue testing device for automotive ball joints, comprising: a base plate with a frame and a base fixed to its top; a hydraulic tappet mechanism fixed to the surface of the frame; a sealing cover and an air conditioner movably mounted on the top of the base plate; a clamp provided on the top of the base plate; and a rod hole opened on the surface of the sealing cover, into which the hydraulic rod of the hydraulic tappet mechanism is movably inserted. The beneficial effect is that the interior of the sealing cover is sealed, and then the air conditioner is activated for cooling or heating, thereby regulating the temperature inside the sealing cover. Once the desired temperature is reached, the hydraulic rod of the hydraulic tappet mechanism can continue to extend, applying radial loading to the automotive ball joint under test, thus completing the test. By repeatedly adjusting the temperature inside the sealing cover and conducting multiple tests on the automotive ball joint, the fatigue strength of the automotive ball joint under various temperature conditions can be measured.

The utility model provides a double-top type roller hydraulic tappet, which relates to the technical field of hydraulic tappets and comprises a first hydraulic tappet and a second hydraulic tappet, the second hydraulic tappet is positioned on the left side surface of the first hydraulic tappet, a fixing mechanism is clamped on the periphery of the first hydraulic tappet, a distance adjusting mechanism is clamped on the periphery of the second hydraulic tappet, and the distance adjusting mechanism is positioned on the left side surface of the first hydraulic tappet. A mounting plate is fixedly connected to the bottom of the fixing mechanism and the bottom of the distance adjusting mechanism, lifting assemblies are fixedly connected to the two sides of the mounting plate, connecting assemblies are fixedly connected to the opposite side faces of the lifting assemblies, and the fixing mechanism comprises first arc-shaped clamping plates symmetrically installed on the periphery of the first hydraulic tappet; first electric push rods are fixedly connected to the opposite side faces of the first arc-shaped clamping plates, first fixing bases are fixedly connected to the peripheries of the fixing ends of the first electric push rods, and adjustment is completed. Through the design, the position of the roller hydraulic tappet can be effectively and flexibly adjusted according to the position between valves, and great convenience is achieved.

The utility model discloses a hydraulic tappet capable of reducing the clamping stagnation defect of a product. The hydraulic tappet solves the problem that in the prior art, a hydraulic tappet is prone to clamping stagnation in the using process. The plunger is arranged in the shell in a sliding mode and connected with a rocker arm, the low-pressure cavity is arranged in the plunger and used for storing engine oil, the high-pressure cavity is arranged between the shell and the plunger and communicated with the low-pressure cavity, the one-way valve mechanism is arranged at the bottom of the plunger, and the reset mechanism is arranged in the high-pressure cavity and connected with the one-way valve mechanism. The receding mechanism is arranged in the shell, the clamping spring is arranged on the plunger and used for limiting rotation of the plunger, and the oil liquid entering mechanism is arranged on the shell and communicates with the low-pressure cavity. The receding mechanism can be used for conveniently receding the plunger when the plunger moves up and down, so that the problem of clamping stagnation of the plunger in the process of moving up and down is avoided, the plunger can be conveniently limited by the clamp spring, and the problem of rotation of the plunger in the process of moving up and down is avoided.

The valve actuation system comprises a first rocker assembly operably connected to a first valve actuation motion source and a first engine valve, with a first lost-motion component arranged in series between a first input rocker and a first output rocker. A second rocker assembly is operably connected to a second valve actuation motion source and a second engine valve, with a second lost-motion component arranged in series between a second input rocker and a second output rocker. A one-way coupling mechanism is configured to transmit the second valve actuation motion to the first output rocker, but to prevent the first valve actuation motion from being transmitted to the second output rocker. Furthermore, a primary hydraulic lash adjuster is configured within the second rocker assembly to act on the first output rocker via the one-way coupling mechanism.