Universal engine brake durability test bench

Abstract

The invention discloses a universal engine brake durability test bench, and relates to the technical field of durability tests. The universal engine brake durability test bench comprises a rack, a position adjusting mechanism and a driving mechanism. The position adjusting mechanism is installed on the rack and connected with the driving mechanism, the rack is provided with a bearing plate, the bearing plate is used for placing a cylinder cover, and the position adjusting mechanism is used for adjusting the position of the driving mechanism so that the driving mechanism can be connected with camshafts in different cylinder cover assemblies. Compared with the prior art, the universal engine brake durability test bench provided by the invention adopts the position adjusting mechanism connected with the driving mechanism, so that durability tests can be carried out on brakes of different types of cylinder cover assemblies, the universality is good, the test cost is reduced, and the economic benefit is improved.

Description

Technical Field

[0001] The invention relates to the technical field of durability testing, and in particular to a universal engine brake durability testing bench. Background Art

[0002] At present, engine auxiliary 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, the cylinder head assembly in the engine now has various models and sizes. If the cylinder brakes of different engines are to be subjected to durability tests, it is necessary to produce a matching test bench, which has poor versatility, high test costs, and poor economic benefits.

[0003] In view of this, it is particularly important to design and manufacture a universal engine brake durability test bench with good versatility, especially in engine testing. Summary of the invention

[0004] The purpose of the present invention is to provide a universal engine brake durability test bench, which can perform durability tests on brakes of cylinder head assemblies of different models, has good versatility, reduces test costs, and improves economic benefits.

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

[0006] A universal engine brake durability test bench is used for performing durability tests on brakes in cylinder head assemblies. The brake is movably mounted on the cylinder head, and a camshaft cooperates with the brake. The universal engine brake durability test bench comprises a frame, a positioning mechanism and a driving mechanism. The positioning mechanism is mounted on the frame and connected to the driving mechanism. The frame is provided with a bearing plate for placing the cylinder head. The positioning mechanism is used for adjusting the position of the driving mechanism so that the driving mechanism can be connected to the camshafts in different cylinder head assemblies.

[0007] Optionally, the positioning mechanism includes a lifting assembly, a lifting frame, a translation assembly and a translation frame, the lifting assembly is installed on the frame and connected to the lifting frame, the lifting assembly is used to drive the lifting frame to lift and lower along a first direction, the translation assembly is installed on the lifting frame and connected to the translation frame, the translation frame is connected to the driving mechanism, and the translation assembly is used to drive the translation frame to translate along a second direction, the first direction being perpendicular to the second direction.

[0008] Optionally, the driving mechanism includes a mounting plate, a first driving member, a driving wheel, a transmission belt, a driven wheel, a connecting shaft and a coupling. The driving wheel is rotatably mounted on the mounting plate, the first driving member is connected to the driving wheel, the driving wheel is connected to the driven wheel through a transmission belt, one end of the connecting shaft is connected to the driven wheel, and the other end is connected to the camshaft through a coupling, and the axial direction, the first direction and the second direction of the connecting shaft are perpendicular to each other.

[0009] Optionally, the mounting plate is fixedly connected to the lifting frame, the first driving member and the driving wheel are arranged on two sides of the mounting plate opposite to each other, the driven wheel is rotatably mounted on the translation frame, and the translation frame is slidably matched with the lifting frame.

[0010] Optionally, the translation frame includes a base plate, a vertical plate and two rib plates, the vertical plate is arranged perpendicular to the base plate and connected to the base plate, the two rib plates are arranged oppositely on both sides of the vertical plate, the rib plates are connected between the vertical plate and the base plate, the base plate is slidably arranged on the lifting frame, and the driven wheels and the coupling are arranged oppositely on two sides of the vertical plate.

[0011] Optionally, the driving mechanism further includes a second driving member and a tensioning wheel, wherein the second driving member is mounted on the mounting plate and is rotationally connected to the tensioning wheel, and the tensioning wheel abuts against the transmission belt.

[0012] Optionally, the lifting assembly includes a third driving member, a screw rod and a nut. The third driving member is mounted on the frame and connected to the screw rod. The screw rod and the nut are threadedly matched. The nut is fixedly connected to the lifting frame. The screw rod is extended along the first direction.

[0013] Optionally, the lifting assembly further includes a guide sleeve and a guide column, the guide sleeve is mounted on the frame, the guide column is arranged parallel to and spaced from the lead screw, and is fixedly connected to the lifting frame, and the guide column and the guide sleeve are slidably matched.

[0014] Optionally, the translation assembly includes two pushing units, which are relatively arranged on both sides of the translation frame. The pushing units include a fourth driving member and a push rod. The fourth driving member is installed on the lifting frame and connected to the push rod. The push rod is against the translation frame.

[0015] Optionally, the universal engine brake durability test bench also includes a torque sensor and an encoder, both of which are connected to the camshaft, the torque sensor is used to detect the rotational torque of the camshaft, and the encoder is used to detect the rotational speed and camshaft angle of the camshaft.

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

[0017] The universal engine brake durability test bench provided by the present invention is used to perform durability tests on brakes in cylinder head assemblies. The brake is movably installed on the cylinder head, and the camshaft cooperates with the brake. The universal engine brake durability test bench includes a frame, a positioning mechanism and a driving mechanism. The positioning mechanism is installed on the frame and connected to the driving mechanism. The frame is provided with a bearing plate, and the bearing plate is used for placing the cylinder head. The positioning mechanism is used to adjust the position of the driving mechanism so that the driving mechanism can be connected to the camshafts in different cylinder head assemblies. Compared with the prior art, the universal engine brake durability test bench provided by the present invention can perform durability tests on brakes of cylinder head assemblies of different models because it adopts a positioning mechanism connected to the driving mechanism. It has good versatility, reduces test costs, and improves economic benefits. 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 a universal engine brake durability test bench provided by an embodiment of the present invention;

[0020] Figure 2 A schematic structural diagram of a cylinder head assembly applied to a universal engine brake durability test bench provided by an embodiment of the present invention;

[0021] Figure 3 A front view of a positioning mechanism in a universal engine brake durability test bench provided by an embodiment of the present invention;

[0022] Figure 4 A left side view of a positioning mechanism in a universal engine brake durability test bench provided by an embodiment of the present invention;

[0023] Figure 5 A top view of a positioning mechanism in a universal engine brake durability test bench provided by an embodiment of the present invention;

[0024] Figure 6 A cross-sectional view of the connection between a piston mechanism and a valve in a universal engine brake durability test bench provided by an embodiment of the present invention.

[0025] Icon: 100-Universal engine brake endurance test bench; 110-Frame; 111-Loading plate; 112-Sealing plate; 113-Through hole; 120-Positioning mechanism; 121-Lifting assembly; 1211-Third drive member; 1212-Screw rod; 1213-Nut; 1214-Guide sleeve; 1215-Guide column; 1216-Slider; 1217-Guide rail; 122-Lifting frame; 1221-Guide pressure strip; 123-Translation assembly; 1231-Pushing unit; 1232-Fourth drive member; 1233-Push rod; 124-Translation frame; 1241-Bottom plate; 1242-Vertical plate; 1243-Rib plate; 130-Drive driving mechanism; 131-mounting plate; 132-first driving member; 133-driving wheel; 134-transmission belt; 135-driven wheel; 136-connecting shaft; 137-coupling; 138-second driving member; 139-tensioning wheel; 1391-flywheel; 140-torque sensor; 150-encoder; 160-piston mechanism; 161-piston body; 162-cylinder sleeve; 163-piston spring; 170-oil system; 171-first oil inlet pipe; 172-first oil outlet pipe; 180-simulated cavity; 200-cylinder head assembly; 210-cylinder head; 220-brake; 221-rocker arm; 222-valve; 230-camshaft. DETAILED DESCRIPTION

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] Please refer to Figures 1 to 6 ( Figure 1 The hollow arrow in the figure indicates the flow direction of the oil). The embodiment of the present invention provides a universal engine brake durability test bench 100, which is used to perform a durability test on an engine cylinder brake 220. The universal test bench 100 can perform a durability test on brakes 220 of cylinder head assemblies 200 of different models, has good versatility, reduces test costs, and improves economic benefits.

[0033] It should be noted that the universal engine brake durability test bench 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 is movably mounted on the cylinder head 210, and the camshaft 230 cooperates with the brake 220, and the camshaft 230 can drive the brake 220 to move relative to the cylinder head 210 to achieve an auxiliary braking function. Specifically, the cylinder head 210 is placed on the universal engine brake durability test bench 100, and the universal engine brake durability test bench 100 is used to be connected with the camshaft 230 in a transmission manner to apply a driving force to the camshaft 230, so that the camshaft 230 drives the brake 220 to move, and after a preset time (the brake 220 runs a preset number of strokes), whether the relevant parts of the brake 220 are deformed or damaged is detected, thereby completing the durability test.

[0034] The universal engine brake durability test bench 100 includes a frame 110, a positioning mechanism 120 and a driving mechanism 130. The positioning mechanism 120 is mounted on the frame 110 and connected to the driving mechanism 130. The positioning mechanism 120 is used to drive the driving mechanism 130 to move so as to adjust the position of the driving mechanism 130. The frame 110 is provided with a bearing plate 111, which is used to place the cylinder head 210, so as to support and fix the cylinder head 210, so as to facilitate the subsequent durability test. Specifically, since the sizes of cylinder head assemblies 200 of different models are different, the positions of the cylinder heads 210 of cylinder head assemblies 200 of different models on the supporting plate 111 are different, and the positions of the camshafts 230 are also different. In order to ensure that the driving mechanism 130 can be reliably transmitted and connected with the camshafts 230 at different positions, in the present invention, the position of the driving mechanism 130 is adjusted by the adjustment mechanism 120 so that the driving mechanism 130 can be connected with the camshafts 230 in different cylinder head assemblies 200, thereby performing durability tests on the brakes 220 of cylinder head assemblies 200 of different models, which has good versatility, reduces test costs, and improves economic benefits.

[0035] The positioning mechanism 120 includes a lifting assembly 121, a lifting frame 122, a translation assembly 123, and a translation frame 124. The lifting assembly 121 is installed on the frame 110 and connected to the lifting frame 122. The lifting assembly 121 is used to drive the lifting frame 122 to move up and down along the first direction. The translation assembly 123 is installed on the lifting frame 122 and connected to the translation frame 124. The translation frame 124 is connected to the driving mechanism 130. The translation assembly 123 is used to drive the translation frame 124 to translate along the second direction. Specifically, the lifting assembly 121 can drive the driving mechanism 130 to lift and lower in a first direction through the lifting frame 122, the translation assembly 123 and the translation frame 124 in sequence, and the translation assembly 123 can drive the driving mechanism 130 to translate in a second direction through the translation frame 124. The first direction is perpendicular to the second direction, so as to realize the movement of the driving mechanism 130 at any position on a two-dimensional plane, so that the driving mechanism 130 can be connected to the camshaft 230 in different cylinder head assemblies 200 through transmission, thereby improving versatility.

[0036] The driving mechanism 130 includes a mounting plate 131, a first driving member 132, a driving wheel 133, a transmission belt 134, a driven wheel 135, a connecting shaft 136 and a coupling 137. The first driving member 132 is mounted on the mounting plate 131, the driving wheel 133 is rotatably mounted on the mounting plate 131, the first driving member 132 is connected to the driving wheel 133, and the first driving member 132 can drive the driving wheel 133 to rotate. The driving wheel 133 is connected to the driven wheel 135 through the transmission belt 134, and the driving wheel 133 can drive the transmission belt 134 to move under the action of the first driving member 132, thereby driving the driven wheel 135 to rotate. One end of the connecting shaft 136 is connected to the driven wheel 135, and the other end is connected to the camshaft 230 through the coupling 137, so as to realize the transmission connection between the driven wheel 135 and the camshaft 230, so that the driven wheel 135 can sequentially drive the camshaft 230 to rotate through the connecting shaft 136 and the coupling 137. Specifically, the axial direction, the first direction, and the second direction of the connecting shaft 136 are perpendicular to each other, and the coupling 137 can be reasonably selected according to the spacing between the connecting shaft 136 and the camshaft 230 to ensure the reliability of the connection between the connecting shaft 136 and the camshaft 230.

[0037] In this embodiment, the first direction is a vertical direction, and the second direction and the third direction are both located on a horizontal plane, so as to facilitate the alignment and connection of the connecting shaft 136 and the cam shaft 230 .

[0038] It should be noted that during the use of the universal engine brake durability test bench 100, the cylinder head 210 of the cylinder head assembly 200 is first placed on the carrier plate 111, and the cylinder head 210 and the carrier plate 111 are fixed together by screws and other connecting parts; then the position of the driving mechanism 130 on the vertical plane is adjusted by the lifting component 121 and the translation component 123, so that the connecting shaft 136 of the driving mechanism 130 is aligned with the camshaft 230 of the cylinder head assembly 200 and is coaxially arranged; then, a coupling 137 of a suitable length is selected according to the spacing between the connecting shaft 136 and the camshaft 230, and the connecting shaft 136 and the camshaft 230 are connected by the coupling 137 to realize the transmission connection between the driving mechanism 130 and the camshaft 230, and then the driving mechanism 130 can drive the camshaft 230 to rotate, thereby driving the brake 220 to move, so as to realize the durability test function.

[0039] Furthermore, the mounting plate 131 is fixedly connected to the lifting frame 122, and the lifting assembly 121 can drive the mounting plate 131 to be lifted and lowered along the first direction through the lifting frame 122, thereby driving the first driving member 132 and the driving wheel 133 to be lifted and lowered along the first direction. The first driving member 132 and the driving wheel 133 are relatively arranged on two sides of the mounting plate 131 to save space and facilitate installation and maintenance. The driven wheel 135 is rotatably mounted on the translation frame 124, and the driven wheel 135 can rotate relative to the translation frame 124 under the action of the transmission belt 134, thereby driving the connecting shaft 136 and the camshaft 230 to rotate. Specifically, the translation frame 124 is slidably matched with the lifting frame 122, and the translation frame 124 can slide relative to the lifting frame 122 along the second direction, and the lifting frame 122 can limit and guide the translation frame 124 to ensure the stability of the translation frame 124 during the sliding process.

[0040] In this embodiment, a guide strip 1221 is provided at the end of the lifting frame 122, and the translation frame 124 slides in cooperation with the guide strip 1221; on the one hand, the guide strip 1221 can guide the translation frame 124 so that the translation frame 124 can only slide along the second direction; on the other hand, the guide strip 1221 can also press the translation frame 124 against the surface of the lifting frame 122 to prevent the translation frame 124 from detaching from the lifting frame 122.

[0041] The translation frame 124 includes a bottom plate 1241, a vertical plate 1242 and two ribs 1243. The vertical plate 1242 is arranged perpendicular to the bottom plate 1241 and connected to the bottom plate 1241. The two ribs 1243 are arranged opposite to each other on both sides of the vertical plate 1242, and the ribs 1243 are connected between the vertical plate 1242 and the bottom plate 1241 to improve the connection strength between the bottom plate 1241 and the vertical plate 1242, and prevent the vertical plate 1242 from deforming relative to the bottom plate 1241. Specifically, the bottom plate 1241 is slidably arranged on the lifting frame 122, and the guide pressure strip 1221 can limit and guide the bottom plate 1241, thereby limiting and guiding the entire translation frame 124. The connecting shaft 136 is set through the vertical plate 1242, and the driven wheel 135 and the coupling 137 are relatively arranged on two sides of the vertical plate 1242, so as to realize the function of the driven wheel 135 driving the coupling 137 to rotate through the connecting shaft 136, and save space, which is convenient for installation and maintenance.

[0042] It should be noted that, during the lifting and lowering process of the positioning mechanism 120, the lifting assembly 121 simultaneously drives the translation assembly 123, the translation frame 124, the mounting plate 131, the first driving member 132, the driving wheel 133, the transmission belt 134, the driven wheel 135, the connecting shaft 136 and the coupling 137 to lift and lower along the first direction through the lifting frame 122. While during the translation of the positioning mechanism 120 along the second direction, the translation assembly 123 simultaneously drives the driven wheel 135, the connecting shaft 136 and the coupling 137 to translate along the second direction through the translation frame 124. During this process, the lifting frame 122, the mounting plate 131, the first driving member 132 and the driving wheel 133 remain stationary, and the transmission belt 134 is displaced under the action of the driven wheel 135 to ensure the transmission effect between the driving wheel 133 and the driven wheel 135.

[0043] Preferably, the driving mechanism 130 further includes a second driving member 138 and a tensioning wheel 139. The second driving member 138 is mounted on the mounting plate 131 and is rotatably connected to the tensioning wheel 139. The tensioning wheel 139 abuts against the transmission belt 134. The second driving member 138 is used to drive the tensioning wheel 139 to move, so that the transmission belt 134 is always in a tensioned state, and the transmission reliability between the driving wheel 133 and the driven wheel 135 is ensured. Specifically, after the adjustment of the positioning mechanism 120 is completed, the connecting shaft 136 of the driving mechanism 130 is aligned with the camshaft 230 of the cylinder head assembly 200 and is coaxially arranged, and the connecting shaft 136 and the camshaft 230 are connected by the coupling 137. At this time, it is necessary to control the second driving member 138 to drive the tensioning wheel 139 to move, so as to tighten the transmission belt 134, and ensure that the subsequent driving mechanism 130 can operate stably, so as to drive the brake 220 to move through the camshaft 230, and realize the durability test function.

[0044] Preferably, the driving mechanism 130 further includes a flywheel 1391. The flywheel 1391 is rotatably mounted on the mounting plate 131 and cooperates with the transmission belt 134. On the one hand, the flywheel 1391 has a large moment of inertia and can store a large amount of kinetic energy when rotating at a high speed (when the speed of the first driving member 132 increases, the kinetic energy of the flywheel 1391 increases and stores the energy; when the speed of the first driving member 132 decreases, the kinetic energy of the flywheel 1391 decreases and releases the energy); on the other hand, the flywheel 1391 has a large mass and can balance the vibration generated by the operation of the first driving member 132, thereby improving stability and the ability to resist external disturbances.

[0045] The lifting assembly 121 includes a third driving member 1211, a screw rod 1212 and a nut 1213. The third driving member 1211 is mounted on the frame 110 and connected to the screw rod 1212. The third driving member 1211 is used to drive the screw rod 1212 to rotate. The screw rod 1212 is threadedly matched with the nut 1213, and the nut 1213 is fixedly connected to the lifting frame 122. The screw rod 1212 is extended along the first direction. The screw rod 1212 can drive the nut 1213 to move along the axial direction (first direction) of the screw rod 1212 during the rotation process, thereby driving the lifting frame 122 to rise and fall along the first direction.

[0046] In this embodiment, the third driving member 1211 is used to realize the electric adjustment of the lifting assembly 121, but it is not limited to this. In other embodiments, the third driving member 1211 can also be cancelled, and the manual adjustment of the lifting assembly 121 can be realized by manually driving the screw rod 1212 to rotate. The operation method of the lifting assembly 121 is not specifically limited.

[0047] Preferably, the lifting assembly 121 further includes a guide sleeve 1214 and a guide column 1215. The guide sleeve 1214 is mounted on the frame 110, the guide column 1215 is arranged in parallel and spaced relation with the screw rod 1212, and is fixedly connected with the lifting frame 122, the guide column 1215 and the guide sleeve 1214 are slidably matched, the guide column 1215 can slide relative to the guide sleeve 1214, and the guide sleeve 1214 can guide and limit the guide column 1215, so as to ensure that the lifting frame 122 can only be lifted and lowered in the first direction, thereby improving the stability of the lifting frame 122 during the lifting process.

[0048] Furthermore, the lifting assembly 121 further includes a slider 1216 and a guide rail 1217. The guide rail 1217 is mounted on the frame 110, and the slider 1216 is mounted on the mounting plate 131. The guide rail 1217 is extended along the first direction, and the guide rail 1217 and the slider 1216 are slidably matched. The slider 1216 can slide relative to the guide rail 1217, and the guide rail 1217 can guide and limit the slider 1216 to ensure that the mounting plate 131 and the lifting frame 122 can only be lifted and lowered along the first direction, further improving the stability of the lifting frame 122 during the lifting process.

[0049] The translation assembly 123 includes two pushing units 1231. The two pushing units 1231 are relatively arranged on both sides of the translation frame 124, and the pushing units 1231 are used to push the translation frame 124 to translate along the second direction. The two pushing units 1231 work together to clamp and fix the translation frame 124 after the translation frame 124 moves to a preset position (the connecting shaft 136 of the driving mechanism 130 is aligned and coaxially arranged with the camshaft 230 of the cylinder head assembly 200), so as to prevent the translation frame 124 from moving accidentally and ensure the stability during the subsequent driving of the camshaft 230 to rotate.

[0050] The pushing unit 1231 includes a fourth driving member 1232 and a push rod 1233. The fourth driving member 1232 is mounted on the lifting frame 122 and connected to the push rod 1233. The push rod 1233 abuts against the translation frame 124. The fourth driving member 1232 is used to push the translation frame 124 to move along the second direction through the push rod 1233.

[0051] In this embodiment, the fourth driving member 1232 is used to realize the electric adjustment of the translation assembly 123, but it is not limited to this. In other embodiments, the fourth driving member 1232 can also be eliminated, and the push rod 1233 can be threadedly matched with the lifting frame 122 to realize manual adjustment of the translation assembly 123 by manually driving the push rod 1233 to rotate. The operation method of the translation assembly 123 is not specifically limited.

[0052] In this embodiment, the first driving member 132 and the third driving member 1211 are both driving motors, and the second driving member 138 and the fourth driving member 1232 are both electric cylinders. However, this is not limited to this. In other embodiments, the first driving member 132 and the third driving member 1211 can be both pneumatic motors or hydraulic motors, and the second driving member 138 and the fourth driving member 1232 can be both cylinders or hydraulic cylinders. The types of the first driving member 132, the second driving member 138, the third driving member 1211 and the fourth driving member 1232 are not specifically limited.

[0053] Preferably, the universal engine brake endurance test bench 100 further includes a torque sensor 140 and an encoder 150. The torque sensor 140 and the encoder 150 are both connected to the camshaft 230. The torque sensor 140 is used to detect the rotation torque of the camshaft 230, and the encoder 150 is used to detect the rotation speed and the rotation angle of the camshaft 230, so as to ensure that the rotation parameters of the camshaft 230 are the same as the preset parameters of the endurance test, realize the function of simulating various extreme environments or actual environments, and improve the accuracy of the endurance test results.

[0054] In this embodiment, the torque sensor 140 is disposed on the connecting shaft 136 , and the encoder 150 is disposed at an end of the camshaft 230 away from the connecting shaft 136 , so as to facilitate installation and accurate detection.

[0055] It should be noted that the universal engine brake durability test bench 100 also includes a piston mechanism 160 and an oil circuit system 170. The frame 110 is also provided with a sealing plate 112, which is connected to the bottom of the bearing plate 111 to fix the relative position of the sealing plate 112 and the bearing plate 111 to prevent the sealing plate 112 from moving relative to the bearing plate 111. Specifically, the bearing plate 111 is provided with a through hole 113, the piston mechanism 160 is installed in the through hole 113, the sealing plate 112 is blocked at one end of the through hole 113, and the oil circuit system 170 is arranged through the sealing plate 112 to simulate the high-pressure environment (combustion chamber) that applies pressure to the brake 220.

[0056] Specifically, 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 with the valve 222. The camshaft 230 can drive the valve 222 to move through the rocker arm 221 to achieve an auxiliary braking function.

[0057] The piston mechanism 160 includes a piston body 161, a cylinder sleeve 162 and a piston spring 163. The cylinder sleeve 162 is installed in the through hole 113, and the piston body 161 is slidably arranged in the cylinder sleeve 162. The piston body 161 is used to abut against the valve 222. The piston body 161 can slide relative to the cylinder sleeve 162 under the drive of the valve 222, and the cylinder sleeve 162 can guide and limit the piston body 161. Specifically, since the sealing plate 112 is sealed at one end of the through hole 113, the sealing plate 112 also seals one end of the cylinder sleeve 162. At this time, the piston body 161, the cylinder sleeve 162 and the sealing plate 112 jointly form a simulated cavity 180. The piston spring 163 is arranged in the simulated cavity 180. One end of the piston spring 163 abuts against the sealing plate 112, and the other end abuts against the piston body 161. The piston spring 163 is always in a compressed state. The piston spring 163 can apply elastic force to the piston body 161 to prevent the piston body 161 from sliding toward the sealing plate 112, thereby facilitating the resetting of the piston body 161, thereby facilitating the formation of a high-pressure environment in the simulated cavity 180.

[0058] Furthermore, the oil circuit system 170 includes a first oil inlet pipe 171 and a first oil outlet pipe 172. Both the first oil inlet pipe 171 and the first oil outlet pipe 172 pass through the sealing plate 112 and are connected to the simulated cavity 180. The first oil inlet pipe 171 is used to supply oil to the simulated cavity 180, and the first oil outlet pipe 172 is used to realize the oil outlet of the simulated cavity 180. The first oil inlet pipe 171 and the first oil outlet pipe 172 work together to ensure that the pressure in the simulated cavity 180 reaches a preset pressure.

[0059] It should be noted that during the operation of the universal engine brake durability test bench 100, the oil system 170 first inputs low-pressure oil into the simulated cavity 180 through the first oil inlet pipe 171; then the driving mechanism 130 applies a driving force 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 163 to push the piston body 161 to slide downward relative to the cylinder sleeve 162 (slide in the direction close to the sealing plate 112), so that a high-pressure environment is formed in the simulated cavity 180; when the pressure in the simulated cavity 180 reaches a preset value, the pressure in the simulated cavity 180 is increased. After the pressure is reached, the oil in the simulated cavity 180 is discharged through the first oil outlet pipe 172 to realize the pressure relief function; then the camshaft 230 continues to rotate under the action of the driving mechanism 130 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 161, and the piston body 161 rebounds upward and resets under the elastic force of the piston spring 163; 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, saving time and effort, and having high detection efficiency and high detection accuracy.

[0060] The universal engine brake durability test bench 100 provided in an embodiment of the present invention is used to perform a durability test on the brake 220 in the cylinder head assembly 200. The brake 220 is movably installed on the cylinder head 210, and the camshaft 230 cooperates with the brake 220. The universal engine brake durability test bench 100 includes a frame 110, a positioning mechanism 120 and a driving mechanism 130. The positioning mechanism 120 is installed on the frame 110 and connected to the driving mechanism 130. The frame 110 is provided with a supporting plate 111, and the supporting plate 111 is used for placing the cylinder head 210. The positioning mechanism 120 is used to adjust the position of the driving mechanism 130 so that the driving mechanism 130 can be connected to the camshafts 230 in different cylinder head assemblies 200. Compared with the prior art, the universal engine brake durability test bench 100 provided by the present invention can perform durability tests on brakes 220 of cylinder head assemblies 200 of different models because it adopts an adjustment mechanism 120 connected to a driving mechanism 130. It has good versatility, reduces test costs, and improves economic benefits.

[0061] 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. A universal engine brake durability test bench, used for durability testing of brakes in cylinder head assemblies, wherein the brakes are movably mounted on the cylinder head and cooperate with the camshaft, and characterized in that: The universal engine brake durability test bench includes a frame, a positioning mechanism and a driving mechanism. The positioning mechanism is installed on the frame and connected to the driving mechanism. The frame is provided with a supporting plate for placing the cylinder head. The positioning mechanism is used to adjust the position of the driving mechanism so that the driving mechanism can be connected to the camshafts in different cylinder head assemblies.

2. The universal engine brake durability test bench according to claim 1, characterized in that: The positioning mechanism includes a lifting assembly, a lifting frame, a translation assembly and a translation frame. The lifting assembly is installed on the frame and connected to the lifting frame. The lifting assembly is used to drive the lifting frame to lift and lower along a first direction. The translation assembly is installed on the lifting frame and connected to the translation frame. The translation frame is connected to the driving mechanism. The translation assembly is used to drive the translation frame to translate along a second direction. The first direction is perpendicular to the second direction.

3. The universal engine brake durability test bench according to claim 2, characterized in that: The driving mechanism includes a mounting plate, a first driving member, a driving wheel, a transmission belt, a driven wheel, a connecting shaft and a coupling. The driving wheel is rotatably mounted on the mounting plate. The first driving member is connected to the driving wheel. The driving wheel is connected to the driven wheel via the transmission belt. One end of the connecting shaft is connected to the driven wheel, and the other end is connected to the camshaft via the coupling. The axial direction of the connecting shaft, the first direction and the second direction are perpendicular to each other.

4. The universal engine brake durability test bench according to claim 3, characterized in that: The mounting plate is fixedly connected to the lifting frame, the first driving member and the driving wheel are arranged on two sides of the mounting plate opposite to each other, the driven wheel is rotatably mounted on the translation frame, and the translation frame is slidably matched with the lifting frame.

5. The universal engine brake durability test bench according to claim 4, characterized in that: The translation frame includes a bottom plate, a vertical plate and two rib plates. The vertical plate is arranged perpendicular to the bottom plate and connected to the bottom plate. The two rib plates are arranged oppositely on both sides of the vertical plate. The rib plates are connected between the vertical plate and the bottom plate. The bottom plate is slidably arranged on the lifting frame. The driven wheel and the coupling are arranged oppositely on two sides of the vertical plate.

6. The universal engine brake durability test bench according to claim 3, characterized in that: The driving mechanism further comprises a second driving member and a tensioning wheel. The second driving member is mounted on the mounting plate and is rotationally connected to the tensioning wheel. The tensioning wheel abuts against the transmission belt.

7. The universal engine brake durability test bench according to claim 2, characterized in that: The lifting assembly includes a third driving member, a screw rod and a nut. The third driving member is installed on the frame and connected to the screw rod. The screw rod is threadedly matched with the nut. The nut is fixedly connected to the lifting frame. The screw rod is extended along the first direction.

8. The universal engine brake durability test bench according to claim 7, characterized in that: The lifting assembly also includes a guide sleeve and a guide column. The guide sleeve is installed on the frame. The guide column is arranged parallel to the screw rod and is fixedly connected to the lifting frame. The guide column and the guide sleeve are slidably matched.

9. The universal engine brake durability test bench according to claim 2, characterized in that: The translation assembly includes two pushing units, which are relatively arranged on both sides of the translation frame. The pushing units include a fourth driving member and a push rod. The fourth driving member is installed on the lifting frame and connected to the push rod. The push rod is against the translation frame.

10. The universal engine brake durability test bench according to claim 1, characterized in that: The universal engine brake durability test bench also includes a torque sensor and an encoder, both of which are connected to the camshaft. The torque sensor is used to detect the rotational torque of the camshaft, and the encoder is used to detect the rotational speed and camshaft angle of the camshaft.

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