Endurance test device for brake in engine cylinder

Abstract

The invention discloses a durability test device for a brake in an engine cylinder, and relates to the technical field of durability tests. The durability test device for the brake in the engine cylinder comprises a piston mechanism, a fixing plate, a sealing plate and an oil way system. The sealing plate is connected to the lower portion of the fixing plate, a through hole is formed in the fixing plate, the piston mechanism comprises a piston body, a cylinder sleeve and a piston spring, the cylinder sleeve is installed in the through hole, the piston body is slidably arranged in the cylinder sleeve, one end of the piston spring abuts against the sealing plate, and the other end of the piston spring abuts against the piston body. The piston body, the cylinder sleeve and the sealing plate jointly form a simulation cavity, the oil way system comprises a first oil inlet pipe and a first oil outlet pipe, and the first oil inlet pipe and the first oil outlet pipe both penetrate through the sealing plate and are communicated with the simulation cavity. The durability test device for the brake in the engine cylinder can simulate the high-pressure environment of operation of the brake in the engine cylinder, achieves the overall durability test of the brake, saves time and labor, and is high in detection efficiency and high in detection precision.

Description

Technical Field

[0001] The present invention relates to the technical field of durability testing, and in particular to a durability testing device for an engine cylinder brake. Background Art

[0002] At present, engine-assisted braking is an efficient auxiliary braking method that can effectively reduce the burden on the main braking system when the car goes down a long slope. Among them, compression-release braking is the most efficient auxiliary braking method. If compression-release braking is to be achieved, the exhaust valve is required to overcome the resistance of high-pressure gas near the top dead center of the compression stroke and open, which will produce huge stress on related parts. Therefore, in order to ensure the reliability of compression-release braking, it is necessary to use a test bench to perform durability tests on the engine cylinder brake. However, there is no test bench specially designed for the overall brake on the market. If the durability test is performed on each component in the brake separately, it will be time-consuming and labor-intensive, with low detection efficiency and low detection accuracy.

[0003] In view of this, it is particularly important to design and manufacture an engine cylinder brake durability test device with high detection efficiency and high detection accuracy, especially in engine testing. Summary of the invention

[0004] The purpose of the present invention is to provide an engine cylinder brake durability test device, which can simulate the high-pressure environment of the engine cylinder brake operation, realize the durability test of the brake as a whole, save time and labor, and have high detection efficiency and high detection accuracy.

[0005] The present invention is achieved by adopting the following technical solutions.

[0006] The invention discloses an engine cylinder brake durability test device, which is used to perform a durability test on the brake in a cylinder head assembly. The brake comprises a rocker arm and a valve movably mounted on the cylinder head. The rocker arm is transmission-connected to the valve. The engine cylinder brake durability test device comprises a piston mechanism, a fixing plate, a sealing plate and an oil circuit system. The sealing plate is connected to the bottom of the fixing plate. The fixing plate is used for placing the cylinder head. The fixing plate is provided with a through hole. The piston mechanism comprises a piston body, a cylinder sleeve and a piston spring. The cylinder sleeve is mounted in the through hole. The piston body can be slidably arranged in the cylinder sleeve. The piston body is used to abut against the valve. One end of the piston spring abuts against the sealing plate, and the other end abuts against the piston body. The piston body, the cylinder sleeve and the sealing plate jointly form a simulated cavity. The oil circuit system comprises a first oil inlet pipe and a first oil outlet pipe. Both the first oil inlet pipe and the first oil outlet pipe pass through the sealing plate and are connected to the simulated cavity.

[0007] Optionally, a limiting groove is provided in the middle of the piston body, the piston spring extends into the limiting groove and abuts against the bottom wall of the limiting groove, and the opening of the limiting groove is chamfered.

[0008] Optionally, the sealing plate is provided with a positioning groove, the piston spring extends into the positioning groove and abuts against the bottom wall of the positioning groove, and the first oil inlet pipe and the first oil outlet pipe are both arranged through the bottom wall of the positioning groove.

[0009] Optionally, the sealing plate is provided with a sealing groove, a sealing ring is arranged in the sealing groove, and the sealing ring abuts against the cylinder sleeve.

[0010] Optionally, the first oil inlet pipe is provided with a one-way valve; and / or the first oil outlet pipe is provided with a pressure relief valve and a pressure sensor.

[0011] Optionally, there are multiple piston mechanisms, through holes, simulated cavities, first oil inlet pipes and first oil outlet pipes, and the multiple through holes are arranged at intervals. The cylinder sleeve of each piston mechanism is installed in a through hole, and each first oil inlet pipe and each first oil outlet pipe are connected to a simulated cavity.

[0012] Optionally, the oil circuit system includes an oil tank, a hydraulic pump, an oil inlet pipe, an oil return pipe and a pressure-surge tank. One end of the hydraulic pump is connected to the oil tank, and the other end is connected to the pressure-surge tank. The pressure-surge tank is connected to the oil inlet pipe, the oil inlet pipe is connected to the first oil inlet pipe, and the first oil outlet pipe is connected to the oil tank through the oil return pipe.

[0013] Optionally, the oil circuit system also includes a second oil inlet pipe and a second oil outlet pipe, the second oil inlet pipe is connected to the oil inlet main pipe, the second oil outlet pipe is connected to the oil return main pipe, and the second oil inlet pipe and the second oil outlet pipe are both used to communicate with the brake; and / or, the oil circuit system also includes a third oil inlet pipe and a third oil outlet pipe, the third oil inlet pipe is connected to the oil inlet main pipe, the third oil outlet pipe is connected to the oil return main pipe, and the third oil inlet pipe and the third oil outlet pipe are both used to communicate with the matching point of the rocker arm and the camshaft.

[0014] Optionally, the oil circuit system further includes a pressure regulating pipeline and a pressure regulating valve, the pressure regulating pipeline is connected between the pressure regulating tank and the oil tank, and the pressure regulating valve is installed on the pressure regulating pipeline.

[0015] Optionally, the oil circuit system further includes a heater, a temperature sensor, a cooling pipeline and a cooler, the heater and the temperature sensor are both installed in the oil tank, the oil tank is connected to the cooling pipeline, and the cooler is installed in the cooling pipeline.

[0016] The engine cylinder brake durability test device provided by the present invention has the following beneficial effects:

[0017] The engine cylinder brake durability test device provided by the present invention comprises a sealing plate connected to the lower side of a fixing plate, the fixing plate is used for placing a cylinder head, a through hole is provided on the fixing plate, a piston mechanism comprises a piston body, a cylinder sleeve and a piston spring, the cylinder sleeve is installed in the through hole, the piston body is slidably arranged in the cylinder sleeve, the piston body is used to abut against the valve, one end of the piston spring abuts against the sealing plate, and the other end abuts against the piston body, the piston body, the cylinder sleeve and the sealing plate jointly form a simulated cavity, and the oil circuit system comprises a first oil inlet pipe and a first oil outlet pipe, the first oil inlet pipe and the first oil outlet pipe both pass through the sealing plate and communicate with the simulated cavity. Compared with the prior art, the engine cylinder brake durability test device provided by the present invention can simulate the high-pressure environment of the engine cylinder brake operation, realize the durability test of the brake as a whole, save time and labor, and has high detection efficiency and high detection accuracy because it adopts the piston body, the cylinder sleeve and the sealing plate that jointly form the simulated cavity and the piston spring arranged in the simulated cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 A schematic structural diagram of an engine cylinder brake durability test device provided by an embodiment of the present invention;

[0020] Figure 2 A schematic diagram of the structure of the connection between the drive motor and the camshaft in the engine cylinder brake durability test device provided by an embodiment of the present invention;

[0021] Figure 3 A cross-sectional view of the connection between the piston mechanism and the valve in the engine cylinder brake durability test device provided by an embodiment of the present invention;

[0022] Figure 4 A cross-sectional view of a piston mechanism in an engine cylinder brake durability test device provided by an embodiment of the present invention;

[0023] Figure 5 A schematic structural diagram of an oil circuit system in an engine in-cylinder brake durability test device provided in an embodiment of the present invention.

[0024] Icons: 100-engine cylinder brake durability test device; 110-piston mechanism; 111-piston body; 112-cylinder sleeve; 113-piston spring; 114-limiting groove; 120-fixing plate; 121-through hole; 130-sealing plate; 131-positioning groove; 132-sealing groove; 133-sealing ring; 140-oil system; 141-first oil inlet pipe; 1411-check valve; 142-first oil outlet pipe; 1421-pressure relief valve; 1422-pressure sensor; 143-oil tank; 144-hydraulic pump; 145-oil inlet main pipe; 146-oil return main pipe; 147-pressure stabilizing tank; 148-second oil inlet pipe; 149-second oil outlet pipe; 150-third oil inlet pipe; 151-third oil outlet pipe; 152-pressure regulating pipeline; 153-pressure regulating valve; 154-heater; 155-temperature sensor; 156-cooling pipeline; 157-cooler; 160-simulated cavity; 170-frame; 180-drive motor; 181-output shaft; 190-coupling; 200-cylinder head assembly; 210-cylinder head; 220-brake; 221-rocker arm; 222-valve; 223-valve bridge; 224-valve stem; 230-camshaft. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0028] In the description of the present invention, it should be noted that the terms "inside", "outside", "upper", "lower", "horizontal", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the product of the invention is usually placed when in use, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connect", "install", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments can be combined with each other.

[0031] Please refer to Figures 1 to 5 ( Figure 1 and Figure 5 The hollow arrow in the figure indicates the flow direction of the oil). The embodiment of the present invention provides an engine cylinder brake durability test device 100, which is used to perform a durability test on the engine cylinder brake 220. It can simulate the high-pressure environment in which the engine cylinder brake 220 operates, and realize the durability test of the brake 220 as a whole, saving time and labor, and having high detection efficiency and high detection accuracy.

[0032] It should be noted that the engine in-cylinder brake durability test device 100 is applied to the cylinder head assembly 200 of the engine, and the cylinder head assembly 200 includes a cylinder head 210, a brake 220 and a camshaft 230, wherein the brake 220 includes a rocker arm 221 and a valve 222 movably mounted on the cylinder head 210, the camshaft 230 cooperates with the rocker arm 221, and the rocker arm 221 is transmission-connected to the valve 222, and the camshaft 230 can drive the valve 222 to move through the rocker arm 221 to realize an auxiliary braking function. Specifically, the cylinder head 210 is placed on the engine cylinder brake durability test device 100, and the engine cylinder brake durability test device 100 is used to be connected to the camshaft 230 in transmission to apply a driving force to the camshaft 230, so that the camshaft 230 rotates, thereby driving the valve 222 to move through the rocker arm 221. After a preset time (the brake 220 runs a preset number of strokes), the relevant parts of the brake 220 (including the rocker arm 221 and the valve 222) are detected to see if they are deformed or damaged, thereby completing the durability test.

[0033] The engine cylinder brake durability test device 100 includes a piston mechanism 110, a fixing plate 120, a sealing plate 130 and an oil circuit system 140. The sealing plate 130 is connected to the bottom of the fixing plate 120 to fix the relative position of the sealing plate 130 and the fixing plate 120 to prevent the sealing plate 130 from moving relative to the fixing plate 120. The fixing plate 120 is used for placing the cylinder head 210 to support and fix the cylinder head 210 for subsequent durability testing. Specifically, the fixing plate 120 is provided with a through hole 121, the piston mechanism 110 is installed in the through hole 121, the sealing plate 130 is blocked at one end of the through hole 121, and the oil circuit system 140 is set through the sealing plate 130 to simulate the high-pressure environment (combustion chamber) that pressurizes the brake 220.

[0034] The piston mechanism 110 includes a piston body 111, a cylinder sleeve 112 and a piston spring 113. The cylinder sleeve 112 is installed in the through hole 121, and the piston body 111 is slidably arranged in the cylinder sleeve 112. The piston body 111 is used to abut against the valve 222. The piston body 111 can slide relative to the cylinder sleeve 112 under the drive of the valve 222, and the cylinder sleeve 112 can guide and limit the piston body 111. Specifically, since the sealing plate 130 is sealed at one end of the through hole 121, the sealing plate 130 also seals one end of the cylinder sleeve 112. At this time, the piston body 111, the cylinder sleeve 112 and the sealing plate 130 jointly form a simulated cavity 160. The piston spring 113 is arranged in the simulated cavity 160. One end of the piston spring 113 abuts against the sealing plate 130, and the other end abuts against the piston body 111. The piston spring 113 is always in a compressed state. The piston spring 113 can apply elastic force to the piston body 111 to prevent the piston body 111 from sliding toward the sealing plate 130, thereby facilitating the resetting of the piston body 111, thereby facilitating the formation of a high-pressure environment in the simulated cavity 160.

[0035] Furthermore, the oil circuit system 140 includes a first oil inlet pipe 141 and a first oil outlet pipe 142, both of which pass through the sealing plate 130 and are connected to the simulated cavity 160. The first oil inlet pipe 141 is used to supply oil to the simulated cavity 160, and the first oil outlet pipe 142 is used to realize oil outlet from the simulated cavity 160. The first oil inlet pipe 141 and the first oil outlet pipe 142 work together to ensure that the pressure in the simulated cavity 160 reaches a preset pressure.

[0036] It should be noted that during the operation of the engine cylinder brake durability test device 100, the oil circuit system 140 first inputs low-pressure oil into the simulated cavity 160 through the first oil inlet pipe 141; then a driving force is applied to the camshaft 230, so that the camshaft 230 drives the valve 222 to move downward through the rocker arm 221, thereby overcoming the elastic force of the piston spring 113 to push the piston body 111 to slide downward relative to the cylinder sleeve 112 (slide in the direction close to the sealing plate 130), so that a high-pressure environment is formed in the simulated cavity 160; when the pressure in the simulated cavity 160 reaches the preset pressure, , the oil in the simulated cavity 160 is discharged through the first oil outlet pipe 142 to realize the pressure relief function; then the camshaft 230 continues to rotate under the action of the driving force to drive the valve 222 to move upward through the rocker arm 221. During this process, the valve 222 no longer applies thrust to the piston body 111, and the piston body 111 rebounds upward and resets under the elastic force of the piston spring 113; this cycle is repeated to achieve high-pressure loading, thereby simulating the high-pressure environment of the brake 220 in the engine cylinder, and realizing the durability test of the brake 220 as a whole, saving time and effort, and having high detection efficiency and high detection accuracy.

[0037] Preferably, a limiting groove 114 is provided in the middle of the piston body 111, the limiting groove 114 is communicated with the simulation cavity 160, the piston spring 113 extends into the limiting groove 114, and abuts against the bottom wall of the limiting groove 114, and the limiting groove 114 is used to limit the piston spring 113 to prevent the piston spring 113 from being misplaced or deflected in the simulation cavity 160, and to ensure that the piston spring 113 and the bottom wall of the limiting groove 114 are reliably abutted, thereby ensuring the stability of the piston body 111 in the upward reset. Specifically, the opening of the limiting groove 114 is chamfered to facilitate the installation of the piston spring 113.

[0038] Preferably, the sealing plate 130 is provided with a positioning groove 131, which is connected to the simulation cavity 160, and the piston spring 113 extends into the positioning groove 131 and abuts against the bottom wall of the positioning groove 131. The position of the positioning groove 131 corresponds to the position of the limiting groove 114. The positioning groove 131 is used to further limit the piston spring 113 to prevent the piston spring 113 from being misplaced or deflected in the simulation cavity 160, to ensure that the piston spring 113 and the bottom wall of the positioning groove 131 are reliably abutted, thereby ensuring the stability of the piston body 111 in resetting upward. Specifically, the first oil inlet pipe 141 and the first oil outlet pipe 142 are both arranged through the bottom wall of the positioning groove 131 to be connected to the simulation cavity 160 through the positioning groove 131, thereby realizing the oil inlet or oil outlet function, and ensuring that the preset high pressure is reached in the simulation cavity 160.

[0039] Furthermore, the sealing plate 130 is provided with a sealing groove 132, in which a sealing ring 133 is arranged. The sealing ring 133 abuts against the cylinder liner 112. The sealing ring 133 is used to seal the gap between the cylinder liner 112 and the sealing plate 130 to prevent the oil in the simulation cavity 160 from overflowing under high pressure, thereby ensuring the air tightness of the simulation cavity 160.

[0040] Preferably, the first oil inlet pipe 141 is provided with a one-way valve 1411, and the one-way valve 1411 is used to prevent the oil in the simulation cavity 160 from flowing back through the first oil inlet pipe 141 under the action of high pressure, thereby ensuring the oil inlet effect.

[0041] Preferably, the first oil outlet pipe 142 is provided with a pressure relief valve 1421 and a pressure sensor 1422. The pressure sensor 1422 is electrically connected to the pressure relief valve 1421. The pressure sensor 1422 is used to detect the pressure in the simulated cavity 160, and to control the pressure relief valve 1421 to discharge the oil in the simulated cavity 160 when the pressure in the simulated cavity 160 is greater than the preset pressure, so as to ensure that the pressure in the simulated cavity 160 is always equal to the preset pressure.

[0042] It should be noted that there are multiple piston mechanisms 110, through holes 121, simulated cavities 160, first oil inlet pipes 141, and first oil outlet pipes 142. Multiple through holes 121 are arranged at intervals, and the cylinder sleeve 112 of each piston mechanism 110 is installed in a through hole 121. Each first oil inlet pipe 141 and each first oil outlet pipe 142 are connected to a simulated cavity 160 to simultaneously realize the simulation function of multiple high-pressure cavities, thereby truly simulating the high-pressure environment of the operation of the engine cylinder brake 220. Specifically, the multiple piston mechanisms 110 are divided into multiple groups, and the number of each group of piston mechanisms 110 is two, and the two piston bodies 111 of each group of piston mechanisms 110 are against a valve 222.

[0043] Further, the valve 222 includes a valve bridge 223 and two valve stems 224. The rocker arm 221 is connected to the valve bridge 223 in a transmission manner, and the valve bridge 223 is connected to the two valve stems 224 at the same time. Each valve stem 224 abuts against a piston body 111. The rocker arm 221 can simultaneously drive the two valve stems 224 to move up and down through the valve bridge 223 under the drive of the camshaft 230, so that the two piston bodies 111 of a group of piston mechanisms 110 slide up and down. Specifically, there are multiple brakes 220, and the number of brakes 220 is the same as the number of groups of piston mechanisms 110. Each brake 220 corresponds to a group of piston mechanisms 110. The camshaft 230 cooperates with the rocker arms 221 of multiple brakes 220 at the same time to synchronously drive multiple valves 222 to move up and down, so that multiple groups of piston mechanisms 110 move synchronously.

[0044] The oil circuit system 140 includes an oil tank 143, a hydraulic pump 144, an oil inlet pipe 145, an oil return pipe 146 and a pressure stabilizing tank 147. One end of the hydraulic pump 144 is connected to the oil tank 143, and the other end is connected to the pressure stabilizing tank 147. The hydraulic pump 144 is used to extract the oil in the oil tank 143 to the pressure stabilizing tank 147. The pressure stabilizing tank 147 is connected to the oil inlet pipe 145. The pressure stabilizing tank 147 is used to stabilize the oil pressure and input the stabilized oil into the oil inlet pipe 145. The oil inlet pipe 145 is connected to the first oil inlet pipe 141, and the oil in the oil inlet pipe 145 can enter the simulation cavity 160 through the first oil inlet pipe 141. The first oil outlet pipe 142 is connected to the oil tank 143 through the oil return pipe 146, and the oil discharged from the simulation cavity 160 can enter the oil return pipe 146 through the first oil outlet pipe 142, and then return to the oil tank 143 to realize the oil return function.

[0045] Preferably, the oil circuit system 140 further includes a second oil inlet pipe 148 and a second oil outlet pipe 149. The second oil inlet pipe 148 is connected to the oil inlet main pipe 145, and the second oil outlet pipe 149 is connected to the oil return main pipe 146. Both the second oil inlet pipe 148 and the second oil outlet pipe 149 are used to communicate with the brake 220. Specifically, the oil in the oil inlet main pipe 145 can enter the brake 220 through the second oil inlet pipe 148, and the oil output from the brake 220 can enter the oil return main pipe 146 through the second oil outlet pipe 149, and then return to the oil tank 143. The second oil inlet pipe 148 and the second oil outlet pipe 149 work together to realize the hydraulic control function of the brake 220.

[0046] Preferably, the oil circuit system 140 further includes a third oil inlet pipe 150 and a third oil outlet pipe 151. The third oil inlet pipe 150 is connected to the main oil inlet pipe 145, and the third oil outlet pipe 151 is connected to the main oil return pipe 146. The third oil inlet pipe 150 and the third oil outlet pipe 151 are both used to communicate with the matching position of the rocker arm 221 and the camshaft 230. Specifically, the oil in the main oil inlet pipe 145 can enter the matching position of the rocker arm 221 and the camshaft 230 through the third oil inlet pipe 150, and the oil output from the matching position of the rocker arm 221 and the camshaft 230 can enter the main oil return pipe 146 through the third oil outlet pipe 151, and then return to the oil tank 143. The third oil inlet pipe 150 and the third oil outlet pipe 151 work together to achieve the lubrication function of the matching position of the rocker arm 221 and the camshaft 230.

[0047] In this embodiment, the oil circuit system 140 is provided with three types of oil circuits, namely a supply oil circuit, a control oil circuit and a lubrication oil circuit, and low-pressure oil passes through these three types of oil circuits. Among them, the first oil inlet pipe 141 and the first oil outlet pipe 142 constitute an oil supply circuit, and the number of supply circuits is multiple. The multiple supply circuits are connected to the multiple simulated cavities 160 one by one to realize the pressurization function of the multiple simulated cavities 160 at the same time, so that the multiple simulated cavities 160 can reach the preset pressure; the second oil inlet pipe 148 and the second oil outlet pipe 149 constitute a control oil circuit, and the number of control oil circuits is one. The control oil circuit is connected to the brake 220 to realize the hydraulic control function of the brake 220; the third oil inlet pipe 150 and the third oil outlet pipe 151 constitute a lubricating oil circuit, and the number of lubricating oil circuits is one. The lubricating oil circuit is connected to the matching point of the rocker arm 221 and the camshaft 230 to realize the lubrication function of the matching point of the rocker arm 221 and the camshaft 230, so as to ensure the stability of the camshaft 230 driving the rocker arm 221 in the movement process.

[0048] Preferably, the oil circuit system 140 further includes a pressure regulating pipeline 152 and a pressure regulating valve 153. The pressure regulating pipeline 152 is connected between the pressure stabilizing tank 147 and the oil tank 143, and the pressure regulating valve 153 is installed on the pressure regulating pipeline 152. Specifically, the pressure regulating valve 153 is used to adjust the pressure in the pressure stabilizing tank 147. When the pressure in the pressure stabilizing tank 147 is too high, the pressure regulating valve 153 is opened to allow part of the oil in the pressure stabilizing tank 147 to return to the oil tank 143 through the pressure regulating pipeline 152, thereby returning the pressure in the pressure stabilizing tank 147 to normal pressure, thereby improving the pressure stabilization effect.

[0049] Preferably, the oil circuit system 140 further includes a heater 154, a temperature sensor 155, a cooling line 156 and a cooler 157. The heater 154 and the temperature sensor 155 are both installed in the oil tank 143, the oil tank 143 is connected to the cooling line 156, and the cooler 157 is installed in the cooling line 156. Specifically, the heater 154 is used to heat the oil in the oil tank 143, the temperature sensor 155 is used to detect the temperature of the oil in the oil tank 143, the cooling line 156 is used to shunt the oil in the oil tank 143 outward and then return it to the oil tank 143, and the cooler 157 is used to cool the shunt oil in the cooling line 156, so as to reduce the temperature of the oil returning to the oil tank 143 from the cooling line 156. The heater 154 and the cooler 157 work together to ensure that the oil in the oil tank 143 reaches a preset temperature, thereby ensuring that the oil entering the simulation cavity 160 is at a preset temperature, so that the simulation cavity 160 quickly reaches high pressure (preset pressure), thereby simulating the high-pressure environment of the combustion chamber.

[0050] In this embodiment, the engine cylinder brake durability test device 100 further includes a frame 170 and a drive motor 180. The drive motor 180 is movably mounted on the frame 170, and the position of the drive motor 180 relative to the frame 170 is adjustable, and the fixing plate 120 is fixedly connected to the frame 170. After the cylinder head 210 is placed on the fixing plate 120, the position of the drive motor 180 is first adjusted so that the camshaft 230 of the cylinder head assembly 200 is coaxially arranged with the output shaft 181 of the drive motor 180; then the camshaft 230 is connected to the output shaft 181 by using the coupling 190, so that the camshaft 230 is driven to rotate by the drive motor 180, thereby driving the rocker arm 221 and the valve 222 to move.

[0051] The engine cylinder brake durability test device 100 provided by the embodiment of the present invention comprises a sealing plate 130 connected to the lower side of a fixing plate 120, the fixing plate 120 is used for placing a cylinder head 210, the fixing plate 120 is provided with a through hole 121, the piston mechanism 110 comprises a piston body 111, a cylinder sleeve 112 and a piston spring 113, the cylinder sleeve 112 is installed in the through hole 121, the piston body 111 is slidably arranged in the cylinder sleeve 112, the piston body 111 is used to abut against the valve 222, one end of the piston spring 113 abuts against the sealing plate 130, and the other end abuts against the piston body 111, the piston body 111, the cylinder sleeve 112 and the sealing plate 130 jointly form a simulated cavity 160, and the oil circuit system 140 comprises a first oil inlet pipe 141 and a first oil outlet pipe 142, the first oil inlet pipe 141 and the first oil outlet pipe 142 both pass through the sealing plate 130 and are connected to the simulated cavity 160. Compared with the prior art, the engine cylinder brake durability test device 100 provided by the present invention adopts the piston body 111, the cylinder sleeve 112 and the sealing plate 130 that jointly form the simulated cavity 160, and the piston spring 113 arranged in the simulated cavity 160. Therefore, it can simulate the high-pressure environment of the engine cylinder brake 220 in operation, realize the durability test of the brake 220 as a whole, save time and labor, and have high detection efficiency and high detection accuracy.

[0052] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An engine cylinder brake durability test device, used for performing durability test on the brake in the cylinder head assembly, the brake comprises a rocker arm and a valve movably mounted on the cylinder head, the rocker arm is drivingly connected to the valve, and is characterized in that: The engine cylinder brake durability test device includes a piston mechanism, a fixing plate, a sealing plate and an oil circuit system, wherein the sealing plate is connected to the bottom of the fixing plate, the fixing plate is used for placing the cylinder head, the fixing plate is provided with a through hole, the piston mechanism includes a piston body, a cylinder sleeve and a piston spring, the cylinder sleeve is installed in the through hole, the piston body is slidably arranged in the cylinder sleeve, the piston body is used to abut against the valve, one end of the piston spring abuts against the sealing plate, and the other end abuts against the piston body, the piston body, the cylinder sleeve and the sealing plate together form a simulated cavity, and the oil circuit system includes a first oil inlet pipe and a first oil outlet pipe, the first oil inlet pipe and the first oil outlet pipe both pass through the sealing plate and are connected to the simulated cavity.

2. The engine cylinder brake durability test device according to claim 1, characterized in that: A limiting groove is provided in the middle of the piston body, the piston spring extends into the limiting groove and abuts against the bottom wall of the limiting groove, and the opening of the limiting groove is chamfered.

3. The engine cylinder brake durability test device according to claim 1, characterized in that: The sealing plate is provided with a positioning groove, the piston spring extends into the positioning groove and abuts against the bottom wall of the positioning groove, and the first oil inlet pipe and the first oil outlet pipe are both arranged through the bottom wall of the positioning groove.

4. The engine cylinder brake durability test device according to claim 1, characterized in that: The sealing plate is provided with a sealing groove, a sealing ring is arranged in the sealing groove, and the sealing ring abuts against the cylinder sleeve.

5. The engine cylinder brake durability test device according to claim 1, characterized in that: The first oil inlet pipe is provided with a one-way valve; And / or, the first oil outlet pipe is provided with a pressure relief valve and a pressure sensor.

6. The engine cylinder brake durability test device according to claim 1, characterized in that: The number of the piston mechanism, the through hole, the simulated cavity, the first oil inlet pipe and the first oil outlet pipe are all multiple, and the multiple through holes are arranged at intervals. The cylinder sleeve of each piston mechanism is installed in a through hole, and each first oil inlet pipe and each first oil outlet pipe are connected to a simulated cavity.

7. The engine cylinder brake durability test device according to claim 1, characterized in that: The oil circuit system includes an oil tank, a hydraulic pump, an oil inlet main pipe, an oil return main pipe and a pressure-surge tank. One end of the hydraulic pump is connected to the oil tank, and the other end is connected to the pressure-surge tank. The pressure-surge tank is connected to the oil inlet main pipe, the oil inlet main pipe is connected to the first oil inlet pipe, and the first oil outlet pipe is connected to the oil tank through the oil return main pipe.

8. The engine cylinder brake durability test device according to claim 7, characterized in that: The oil circuit system further includes a second oil inlet pipe and a second oil outlet pipe, wherein the second oil inlet pipe is connected to the oil inlet main pipe, and the second oil outlet pipe is connected to the oil return main pipe, and both the second oil inlet pipe and the second oil outlet pipe are used to communicate with the brake; And / or, the oil circuit system also includes a third oil inlet pipe and a third oil outlet pipe, the third oil inlet pipe is connected to the oil inlet main pipe, the third oil outlet pipe is connected to the oil return main pipe, and the third oil inlet pipe and the third oil outlet pipe are both used to communicate with the matching point of the rocker arm and the camshaft.

9. The engine cylinder brake durability test device according to claim 7, characterized in that: The oil circuit system further comprises a pressure regulating pipeline and a pressure regulating valve. The pressure regulating pipeline is connected between the pressure stabilizing tank and the oil tank, and the pressure regulating valve is installed on the pressure regulating pipeline.

10. The engine cylinder brake durability test device according to claim 7, characterized in that: The oil circuit system also includes a heater, a temperature sensor, a cooling pipeline and a cooler. The heater and the temperature sensor are both installed in the oil tank. The oil tank is connected to the cooling pipeline. The cooler is installed in the cooling pipeline.

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