Camshaft parts replacement methods, systems, and robotic equipment
By using a combination of camshaft positioning fixture and electric chain tensioner, the problem of inaccurate timing chain position during camshaft component replacement in a fully mounted vehicle state was solved, achieving accuracy and safety of the engine timing system and reducing risks and costs during maintenance.
Patent Information
- Application Number
- CN202311242599.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-09-25
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2043-09-25
AI Technical Summary
Existing technology cannot guarantee the accuracy of the timing chain position after the camshaft parts are replaced while the vehicle is in operation, which leads to inaccuracy of the timing system and increased maintenance risks.
Use a camshaft positioning clamp to fix the camshaft on the side that has not been replaced, use an electric chain tensioner to adjust the chain tension, and replace the electric chain tensioner with a timing chain tensioner after replacement to ensure that the timing chain is in the timing position.
During the replacement of camshaft parts while the vehicle is in its assembled state, ensure that the engine timing chain is in the correct timing position to reduce maintenance risks and costs, and minimize defects such as parts damage and engine oil leaks.
Smart Images
Figure CN117103165B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of engine maintenance technology, and in particular to a method, system and robotic device for replacing camshaft parts. Background Technology
[0002] With the development of engine technology, when a defect related to the valve train is found after the engine assembly is installed in the vehicle, and it is necessary to replace parts or perform analysis on the valve train camshaft, a method has emerged to directly replace the relevant parts of the valve train camshaft while the engine assembly is still installed in the vehicle. However, current methods and tools cannot guarantee that the engine timing chain will be in the correct timing position after the replacement of camshaft parts while the vehicle is still installed, i.e., the accuracy of the timing system. Summary of the Invention
[0003] Therefore, it is necessary to provide a method, system, and robotic device for replacing camshaft parts that can ensure the accuracy of the timing system, in order to address the aforementioned technical problems.
[0004] Firstly, this application provides a method for replacing parts of a camshaft, including:
[0005] When it is necessary to replace the first camshaft parts, use a camshaft positioning fixture to fix the second camshaft so that the timing chain is kept in the timing position.
[0006] Replace the timing chain tensioner with an electric chain tensioner;
[0007] Adjust the timing chain tension using an electric chain tensioner and replace parts of the first side camshaft;
[0008] After replacing the parts of the first camshaft, use another camshaft positioning fixture to fix the first camshaft in order to fix the timing chain in the timing position.
[0009] Replace the electric chain tensioner with a timing chain tensioner and remove the camshaft positioning clamps.
[0010] In one embodiment, the camshaft positioning fixture includes a bent plate and a protruding rod connected at one end to the bent plate; bolt holes are provided on the bent plate; the process of fixing the camshaft using the camshaft positioning fixture includes:
[0011] Insert the protruding rod into the timing positioning hole of the camshaft and align the bolt hole with the bolt slot on the cylinder head retainer;
[0012] Use bolts to pass through bolt holes and bolt slots in sequence to tighten the timing chain and keep it in the timing position.
[0013] In one embodiment, the camshaft positioning fixture further includes a buffer element disposed on the portion of the bent plate for contacting the timing chain on the camshaft, the shape of the buffer element matching the shape of the contacting timing chain; prior to the step of using bolts to sequentially pass through bolt holes and bolt slots to press the timing chain to hold it in the timing position, the fixture further includes:
[0014] Adjust the orientation of the bending plate so that the buffer covers the timing chain it contacts.
[0015] In one embodiment, the electric chain tension adjuster includes a motor, a motor drive controller, a transmission mechanism, and a slider. A first end of the transmission mechanism is connected to the motor shaft, and a second end is connected to the slider. The motor drive controller is connected to the motor. The process of adjusting the timing chain tension using the electric chain tension adjuster and replacing parts of the first side camshaft includes:
[0016] The motor drive controller is used to control the motor drive transmission mechanism to move the slider, thereby tensioning the timing chain.
[0017] In one embodiment, the transmission mechanism includes a threaded screw, with a first end connected to the shaft of a motor and a second end connected to a slider; the motor drive controller controls the motor drive transmission mechanism to move the slider, including:
[0018] The motor drive controller is used to control the rotation of the threaded screw, so that the threaded screw pushes the slider to move.
[0019] Secondly, this application also provides a camshaft parts replacement system, including: an electric chain tensioner and two camshaft positioning clamps;
[0020] One of the camshaft positioning fixtures is used to fix the second camshaft in the event that the first camshaft parts need to be replaced, so that the timing chain is kept in the timing position;
[0021] The electric chain tensioner is used to replace the timing chain tensioner and adjust the timing chain tension to provide the chain tension required for replacing the first side camshaft parts;
[0022] Another camshaft positioning fixture is used to fix the first camshaft after replacing the parts of the first camshaft, so that the electric chain tensioner can be replaced with a timing chain tensioner while the timing chain is fixed in the timing position;
[0023] The camshaft positioning fixture is also used to remove the camshaft from the corresponding camshaft after the electric chain tensioner has been replaced with a timing chain tensioner.
[0024] In one embodiment, the camshaft positioning fixture includes a bent plate and a protruding rod connected at one end to the bent plate; the bent plate is provided with bolt holes; wherein:
[0025] The protruding rod is used to insert into the timing positioning hole of the camshaft;
[0026] Bolt holes are used to correspond to bolt slots on the cylinder head retainer and for bolts to pass through to press the timing chain to hold it in the timing position.
[0027] In one embodiment, the bending plate includes a first metal plate extending along a first direction, a second metal plate extending from one end of the first metal plate along a second direction, and two ear plates. The ear plates are connected to the ends of the second metal plates that are not connected to the first metal plate, and the ear plates and the first metal plate are located on opposite sides of the second metal plate. Bolt holes are provided on the ear plates, and the first direction and the second direction are perpendicular to each other.
[0028] The protruding rod and the ear plate are located on the same side of the second metal plate, and one end of the protruding rod is fixedly connected to the second metal plate. The protruding rod is bent toward the side where the ear plate is located and extends out of the end face where the ear plate is located.
[0029] In one embodiment, the camshaft positioning fixture further includes a buffer disposed on a portion of the first metal plate for contacting the timing chain on the camshaft, the shape of the buffer matching the shape of the contacting timing chain.
[0030] Thirdly, this application also provides a robotic device, including a memory and a processor, wherein the computer program, when executed by the processor, implements the steps of the above-described method for replacing parts of the camshaft.
[0031] The aforementioned camshaft parts replacement method, system, and robotic equipment, when replacing camshaft parts, first use a camshaft positioning fixture to fix the second camshaft (the one whose parts have not been replaced) to ensure that the timing chain connected to this camshaft remains in the timing position. Then, an electric chain tensioner is used to adjust the chain tension to provide the required chain tension for replacing the first camshaft parts. After replacing the first camshaft parts, another camshaft positioning fixture is used to fix the first camshaft. At this point, with both camshafts fixed, a timing chain tensioner replaces the electric chain tensioner. Finally, all camshaft positioning fixtures are removed. This application uses a camshaft positioning fixture to press the chain and fix the camshaft, preventing chain movement. An electric chain tensioner is used to adjust the chain to the required tension to keep the timing chain in the timing position. This ensures that the engine timing chain is in the timing position after the camshaft parts replacement operation is performed while the vehicle is in its mounted state, thus ensuring the accuracy of the timing system and reducing the risks and costs during maintenance. Attached Figure Description
[0032] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0033] Figure 1 This is a schematic diagram illustrating the application of a camshaft component replacement method in one embodiment.
[0034] Figure 2 This is a flowchart illustrating a method for replacing parts of a camshaft in one embodiment;
[0035] Figure 3 This is a schematic diagram of the camshaft positioning fixture in one embodiment;
[0036] Figure 4 This is a flowchart illustrating the camshaft positioning fixture fixing steps in one embodiment;
[0037] Figure 5 This is a circuit diagram of an electric chain tension adjuster in one embodiment. Detailed Implementation
[0038] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.
[0039] It is understood that the terms "first," "second," etc., used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of this application, a first-side camshaft may be referred to as a second-side camshaft, and similarly, a second-side camshaft may be referred to as a first-side camshaft. Both the first-side camshaft and the second-side camshaft are camshafts, but they are not the same camshaft.
[0040] The method for replacing parts of a camshaft provided in this application embodiment can be applied to, for example... Figure 1The engine shown (with exploded views of some components related to the camshaft) has a camshaft 102, a crucial component. It is typically made of a long strip of metal with multiple cams mounted on it. The camshaft 102 is connected to the timing chain 106 via a camshaft gear 104, which is mounted on the camshaft 102 and has a tooth count and pitch that match the sprockets on the timing chain 106. The timing chain 106 is thus a vital component connecting the engine crankshaft and camshaft 102. Their synchronized movement is essential for the engine's normal operation. The timing chain tensioner 108 ensures the tension of the chain 106, guaranteeing synchronization between the camshaft 102 and crankshaft, thus enabling the engine to function.
[0041] In practical use, the camshaft has many components, and a malfunction in even one component can lead to timing position deviations, affecting engine performance. In such cases, camshaft component inspection and replacement are necessary. To address this, in an exemplary embodiment, such as... Figure 2 As shown, a method for replacing camshaft parts is provided, including the following steps S202 to S210. Wherein:
[0042] In step S202, if it is necessary to replace the first side camshaft parts, a camshaft positioning fixture is used to fix the second side camshaft so that the timing chain is kept in the timing position.
[0043] A camshaft positioning fixture is a tool used to fix and position a camshaft. It may include a fixture body, fixture base, locating pins, and possibly a bent plate and a protruding bar. The bent plate has a shape adapted to the camshaft, allowing the fixture to fix the camshaft and ensure its position and orientation remain unchanged. The bent plate (fixture body) can be mounted on the cylinder head retainer to press the chain, preventing it from moving. The fixture base provides stable support, preventing the fixture from wobbling or slipping during use. The protruding bar (locating pin) ensures accurate camshaft positioning, preventing camshaft misalignment or wobbling during replacement. It should be understood that when replacing camshaft parts in the engine valve train, fixing the other side of the camshaft first is to maintain the timing position of the chain. Engine timing is crucial for engine ignition timing and operation; the engine timing position refers to the relative position of the piston and valves that meets ignition requirements. If the camshaft on the other side is not secured, the chain may become loose or misaligned, leading to timing misalignment and affecting the normal operation of the engine.
[0044] Step S204: Replace the timing chain tensioner with an electric chain tensioner.
[0045] An electric timing chain tensioner adjuster is a device that adjusts the tension of the timing chain. It may include a power system, control unit, and drive unit. The electric timing chain tensioner adjuster can have the same mounting structure as the timing chain tensioner to replace it. Specifically, the original timing chain tensioner can be removed from the engine, and the electric timing chain tensioner can be installed on the engine, ensuring it is aligned with the chain and other related components. It should be understood that different timing chain tensioners provide different tensions for the timing chains of different engine models, and cannot be changed quickly and in real time. The electric timing chain tensioner, however, can quickly adjust the chain tension according to the actual needs during maintenance.
[0046] Step S206: Adjust the tension of the timing chain using an electric chain tensioner and replace the parts of the first side camshaft.
[0047] When removing an old camshaft, the timing chain can be tightened using an electric chain tensioner to facilitate removal. Similarly, when installing a new camshaft, the timing chain can be tightened using the same mechanism. After replacing camshaft components, the timing chain can be loosened using the same mechanism for subsequent processing. The electric chain tensioner includes a control unit and a drive unit. The control unit controls the drive unit to move the chain and adjust its tension.
[0048] Step S208: After replacing the parts of the first side camshaft, use another camshaft positioning fixture to fix the first side camshaft in order to fix the timing chain in the timing position.
[0049] After replacing the parts of the first camshaft, it is necessary to fix the first camshaft in place with a positioning fixture in a timely manner to avoid the impact on the timing position that may be caused by the timing chain loosening or the first camshaft swinging.
[0050] Step S210: Replace the electric chain tensioner with a timing chain tensioner and remove the camshaft positioning fixtures.
[0051] After installing camshaft positioning fixtures on both the first and second camshafts, the accuracy of the timing chain position on the first and second camshafts is ensured. At this point, the timing chain can be loosened using an electric chain tensioner. Then, the electric chain tensioner can be removed, a timing chain tensioner can be installed and adjusted, and the timing chain can be re-tensioned before the camshaft positioning fixtures can be removed.
[0052] In the aforementioned method for replacing camshaft parts, when replacing camshaft parts, a camshaft positioning fixture is first used to fix the second camshaft (the one whose parts have not been replaced) to ensure that the timing chain connected to this camshaft remains in the timing position. Then, an electric chain tensioner is used to adjust the chain tension to provide the required chain tension for replacing the first camshaft parts. After replacing the first camshaft parts, another camshaft positioning fixture is used to fix the first camshaft. At this point, with both camshafts fixed, a timing chain tensioner replaces the electric chain tensioner. Finally, all camshaft positioning fixtures are removed. This application uses a camshaft positioning fixture to press the chain and fix the camshaft, preventing the chain from moving. An electric chain tensioner is used to adjust the chain to the required tension to keep the timing chain in the timing position. This ensures that the engine timing chain is in the timing position after the camshaft parts replacement operation is performed while the vehicle is in its mounted state, thus ensuring the accuracy of the timing system and reducing the risks and costs during maintenance.
[0053] Furthermore, the camshaft replacement method provided in this application eliminates the need to remove the engine assembly from the vehicle, replace the valve train camshaft components while the engine assembly is in place, and then reinstall the engine assembly on the vehicle. This method, when replacing valve train camshaft components while the engine assembly is mounted on the vehicle, utilizes a designed camshaft positioning fixture to hold the camshaft on the side not being replaced. Simultaneously, a controllable electric chain tension adjuster adjusts the timing chain tension, ensuring accurate engine timing during the process. Compared to methods that remove the engine assembly from the vehicle, this method reduces the number of parts disassembled and assembled, significantly reduces the time required to replace camshaft components, and avoids potential problems such as component damage, engine oil leaks, and incorrect engine timing that can occur when replacing engine parts while the vehicle is mounted.
[0054] In one exemplary embodiment, the camshaft positioning fixture 300 is as follows: Figure 3 As shown, it includes a bent plate 320 and a protruding rod 340 connected to the bent plate 320 at one end; the bent plate 320 is provided with bolt holes 360; the process of fixing the camshaft using the camshaft positioning fixture 300 is as follows: Figure 4 As shown, steps 402 to 404 are included. Wherein:
[0055] Step 402: Insert the protruding rod into the timing positioning hole of the camshaft and align the bolt hole with the bolt slot on the cylinder head retainer.
[0056] Inserting the protruding rod into the timing positioning hole of the camshaft and fixing it to the cylinder head retainer with the bending plate can achieve the effect of positioning the camshaft and thus prevent the camshaft from wobbling; the bolt holes on the bending plate are placed in the bolt slots on the cylinder head retainer to facilitate subsequent bolt installation and fixing.
[0057] Step 404: Use bolts to pass through bolt holes and bolt slots in sequence to tighten the timing chain and keep it in the timing position.
[0058] The process involves using bolts to pass through bolt holes and bolt slots in sequence to fix the bent plate where the bolt holes are located onto the cylinder head retainer where the bolt slots are located, and to allow the timing chain to be pressed against the other side of the bent plate.
[0059] In this embodiment, the camshaft can be positioned by inserting the protruding bar on the bending plate into the timing positioning hole of the camshaft, preventing the chain from skipping teeth due to camshaft wobbling. The bending plate can be fixed to the cylinder head retainer by the bolt holes on the bending plate, which can tighten the timing chain and prevent chain slippage. This reduces the risk of timing chain slippage and skipping teeth, ensuring the accuracy of the timing system, reducing operational wear, and improving service life.
[0060] In one exemplary embodiment, the camshaft positioning fixture 300 further includes a buffer (not shown) disposed on the portion of the bending plate 320 for contacting the timing chain on the camshaft, the shape of the buffer matching the shape of the contacted timing chain; prior to the step of using bolts to sequentially pass through bolt holes 360 and bolt slots to press the timing chain to hold it in the timing position, the fixture further includes: adjusting the orientation of the bending plate 320 so that the buffer covers the contacted timing chain.
[0061] The buffer component serves to cushion and protect the workpiece between the clamp and the fixture, preventing damage or deformation during clamping. Buffer components can be made of flexible materials such as rubber, polyurethane, cork, or soft plastic. The shape of the buffer component should match the shape of the timing chain it contacts; it can either just cover it or have extra redundancy to prevent loosening. Before using bolts to secure the bending plate, adjust its fixing posture so that the buffer covers the timing chain, preventing damage to the timing chain from the bending plate's pressure during bolt tightening.
[0062] In this embodiment, by providing a buffer in the bending plate 320 so that the buffer part can contact the timing chain, the timing chain can be buffered and protected, reducing the possibility of damage to the timing chain, reducing possible losses during operation, and improving service life.
[0063] In an exemplary embodiment, the electric chain tension adjuster includes a motor, a motor drive controller, a transmission mechanism, and a slider. The first end of the transmission mechanism is connected to the motor shaft, and the second end is connected to the slider. The motor drive controller is connected to the motor. The process of adjusting the tension of the timing chain using the electric chain tension adjuster and replacing the parts of the first side camshaft includes: using the motor drive controller to control the motor drive transmission mechanism to push the slider to move, so as to tension the timing chain.
[0064] The electric chain tension adjuster operates at 5V, powered by a 12V battery, using a 12V to 5V converter to obtain the 5V voltage. A rocker switch is used for power on / off control. A micro stepper motor drive controller controls the forward and reverse rotation of the stepper motor. The motor shaft is connected to a transmission mechanism, on which a push block is mounted. Adjusting the motor's forward or reverse rotation moves the push block up and down, thus adjusting the chain tension.
[0065] In this embodiment, a motor drive controller is used to control a motor drive transmission mechanism to move a slider to tension the timing chain. Compared with a timing chain tensioner, the tension can be flexibly adjusted to meet the tension required for changing parts, thus improving work efficiency.
[0066] In one exemplary embodiment, the transmission mechanism includes a threaded screw, with a first end connected to the shaft of a motor and a second end connected to a slider; controlling the motor drive transmission mechanism to move the slider using a motor drive controller includes: controlling the motor drive threaded screw to rotate so that the threaded screw moves the slider.
[0067] A lead screw is a transmission mechanism that converts rotational motion into sliding motion. It consists of a threaded rod and a mating nut. In the operating environment of an engine valve train, a lead screw is used to convert the rotation of the motor into the sliding movement of a slider, thereby driving the timing chain to change its tension.
[0068] In this embodiment, a threaded screw is used to convert the rotation of the motor into the movement of the slider, which is suitable for the working environment of the engine valve train and improves the efficiency and reliability of operation.
[0069] In one specific embodiment, the method for replacing camshaft components may include:
[0070] When it is necessary to replace the first camshaft parts, a camshaft positioning fixture is used to fix the second camshaft so that the timing chain is kept in the timing position.
[0071] The camshaft positioning fixture includes a bent plate, a protruding rod connected to one end of the bent plate, and a buffer. The bent plate has bolt holes. The buffer is located on the portion of the bent plate that contacts the timing chain on the camshaft, and its shape matches the shape of the contacting timing chain. The process of fixing the camshaft using the camshaft positioning fixture includes: inserting the protruding rod into the timing positioning hole of the camshaft and aligning the bolt hole with the bolt slot on the cylinder head retainer; adjusting the orientation of the bent plate so that the buffer covers the contacting timing chain; and using bolts to sequentially pass through the bolt holes and bolt slots to press the timing chain and hold it in the timing position.
[0072] The camshaft positioning fixture design can be as follows: based on the two bolt holes of the cylinder head retainer, the positioning bolt holes of the fixture are designed to be installed on the cylinder head retainer. The bent plate structure presses the timing chain to prevent the timing chain from moving. To prevent damage to the timing chain, a soft plastic strip is added at the pressing point. A protruding rod is designed on the side of the fixture to position the camshaft and prevent the timing chain from skipping teeth after the camshaft swings.
[0073] Replace the timing chain tensioner with an electric chain tensioner; the electric chain tensioner includes a motor, a motor drive controller, a threaded screw, and a slider. The first end of the threaded screw is connected to the motor shaft, and the second end is connected to the slider. The motor drive controller is connected to the motor.
[0074] One exemplary design of the electric chain tension adjuster can be as follows: Figure 5As shown: Power Supply Design: Design a 12V rechargeable portable power supply, using a dry-cell lead-acid battery (quantity: 1 unit, model YTX4L-BS 12V 3Ah, length*width*height: 113mm * 70mm * 85mm). Main Power Switch Design: Design a 2-pin rocker switch as the main power switch (quantity: 1 unit, model KCD1-101, length*width: 15*21mm). The main switch is connected to the positive terminal of the power supply and controls the connection and disconnection of the main power supply. Voltage Conversion Module Design: Design an integrated circuit module (quantity: 1 unit), model TML2596BB, to convert 12V DC to 5V DC and provide voltage regulation (length*width*height: 43mm * 21mm * 12mm). Motor Design: Design a micro stepper motor, model Y15-52A, length*width*height: 65mm * 15mm * 15mm. Motor type: 2-phase hybrid 4-wire system, drive voltage 4-6V, lead screw length 52mm, effective slider stroke 40mm. Control relay design; a 2-phase 4-wire stepper motor drive controller (quantity: 1 unit, (L*W*H: 52mm * 36mm * 12mm)) is selected, with a drive voltage of DC 4-6V and adjustable drive speed (0-9 levels). Includes a 0-8 meter infrared remote control and forward / reverse buttons for remote or manual control of the stepper motor.
[0075] The motor drive controller is used to control the rotation of the screw drive, so that the screw drive pushes the slider to move, thereby tensioning the timing chain and replacing the parts of the first side camshaft.
[0076] After replacing the parts of the first camshaft, use another camshaft positioning fixture to fix the first camshaft in place to keep the timing chain in the timing position; replace the electric chain tensioner with a timing chain tensioner and remove each camshaft positioning fixture.
[0077] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.
[0078] The present invention also provides a camshaft parts replacement system to implement the above-described camshaft parts replacement method. The embodiments of the camshaft parts replacement system of the present invention will be described in detail below.
[0079] In one exemplary embodiment, the camshaft parts replacement system includes: an electric chain tensioner and two such as Figure 3 The camshaft positioning fixture 300 shown includes:
[0080] One of the camshaft positioning fixtures 300 is used to fix the second camshaft in the event that the first camshaft parts need to be replaced, so that the timing chain is kept in the timing position.
[0081] The electric chain tensioner is used to replace the timing chain tensioner and adjust the timing chain tension to provide the chain tension required for replacing the first-side camshaft components.
[0082] Another camshaft positioning fixture 300 is used to fix the first side camshaft after replacing the parts of the first side camshaft, so that the electric chain tensioner can be replaced with a timing chain tensioner when the timing chain is fixed in the timing position.
[0083] The camshaft positioning fixture 300 is also used to remove the corresponding camshaft after the electric chain tensioner has been replaced with a timing chain tensioner.
[0084] In one exemplary embodiment, such as Figure 3 As shown, the camshaft positioning fixture 300 includes a bent plate 320 and a protruding rod 340 with one end connected to the bent plate 320; the bent plate 320 is provided with bolt holes 360; wherein:
[0085] The protruding rod 340 is used to insert into the timing positioning hole of the camshaft.
[0086] Bolt holes 360 correspond to bolt slots on the cylinder head retainer and allow bolts to pass through to press the timing chain to hold it in the timing position.
[0087] In one exemplary embodiment, such as Figure 3 As shown, the bending plate 320 includes a first metal plate 322 extending along a first direction, a second metal plate 324 extending from one end of the first metal plate 322 along a second direction, and two ear plates 326. The ear plates 326 are connected to the ends of the second metal plate 324 that are not connected to the first metal plate 322, and the ear plates 326 and the first metal plate 322 are located on opposite sides of the second metal plate 324. Bolt holes 360 are provided on the ear plates 326, and the first direction and the second direction are perpendicular.
[0088] The protruding rod 340 and the ear plate 326 are disposed on the same side of the second metal plate 324, and one end of the protruding rod 340 is fixedly connected to the second metal plate 324. The protruding rod 340 is bent toward the side where the ear plate 326 is located and extends out of the end face where the ear plate 326 is located.
[0089] In one exemplary embodiment, the camshaft positioning fixture 300 further includes a buffer (not shown) disposed on the portion of the first metal plate 322 for contacting the timing chain on the camshaft, the shape of the buffer matching the shape of the contacting timing chain.
[0090] For specific limitations regarding the camshaft parts replacement system, please refer to the corresponding limitations on the camshaft parts replacement method mentioned above, which will not be repeated here.
[0091] Based on the same inventive concept, this application also provides a robotic device for implementing the above-described method for replacing camshaft parts. The solution provided by this robotic device is similar to the solution described in the above method; therefore, the specific limitations in one or more embodiments provided below can be found in the limitations of the camshaft part replacement method described above, and will not be repeated here.
[0092] In one embodiment, a robotic device is also provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps in the above method embodiments.
[0093] The robot device may include a controller and a motion execution structure. The motion execution structure may include, but is not limited to, a robotic arm, a robotic gripper, a vacuum suction cup, a wrench attached to the end of the robotic arm, etc. The controller in the robot device may include a memory and a processor. When the processor executes a computer program, it can drive the motion execution mechanism to perform actions such as positioning, installing and removing the camshaft positioning fixture, and replacing the timing chain tensioner.
[0094] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0095] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.
Claims
1. A method for replacing parts of a camshaft, characterized in that, The method includes: When it is necessary to replace the first camshaft parts, use a camshaft positioning fixture to fix the second camshaft so that the timing chain is kept in the timing position. Replace the timing chain tensioner with an electric chain tensioner; The tension of the timing chain is adjusted using the electric chain tension adjuster, and the parts of the first side camshaft are replaced. After replacing the parts of the first side camshaft, use another camshaft positioning fixture to fix the first side camshaft in order to fix the timing chain in the timing position; Replace the electric chain tensioner with the timing chain tensioner and remove each of the camshaft positioning fixtures; The camshaft positioning fixture includes a bent plate and a protruding rod connected to the bent plate at one end; the bent plate is provided with bolt holes; the process of fixing the camshaft using the camshaft positioning fixture includes: inserting the protruding rod into the timing positioning hole of the camshaft and placing the bolt hole corresponding to the bolt groove on the cylinder head retainer; using bolts to pass through the bolt hole and the bolt groove in sequence to press the timing chain to maintain it in the timing position.
2. The method according to claim 1, characterized in that, The camshaft positioning fixture further includes a buffer element disposed on the portion of the bent plate that contacts the timing chain on the camshaft, the shape of the buffer element matching the shape of the contacting timing chain; prior to the step of using bolts to sequentially pass through the bolt holes and the bolt slots to press the timing chain to maintain it in the timing position, the fixture further includes: Adjust the orientation of the bending plate so that the buffer covers the timing chain it contacts.
3. The method according to claim 1, characterized in that, The electric chain tension adjuster includes a motor, a motor drive controller, a transmission mechanism, and a slider. The first end of the transmission mechanism is connected to the motor shaft, and the second end is connected to the slider. The motor drive controller is connected to the motor. The process of adjusting the timing chain tension using the electric chain tension adjuster and replacing parts of the first side camshaft includes: The motor drive controller controls the motor to drive the transmission mechanism to move the slider, thereby tensioning the timing chain.
4. The method according to claim 3, characterized in that, The transmission mechanism includes a threaded screw, with a first end connected to the shaft of the motor and a second end connected to a slider; the step of using the motor drive controller to control the motor to drive the transmission mechanism and push the slider to move includes: The motor drive controller is used to control the motor to drive the threaded screw to rotate, so that the threaded screw pushes the slider to move.
5. A camshaft parts replacement system, characterized in that, include: Electric chain tensioner and two camshaft positioning clamps; One of the camshaft positioning fixtures is used to fix the second camshaft in the event that the first camshaft parts need to be replaced, so that the timing chain is kept in the timing position; The electric chain tension adjuster is used to replace the timing chain tensioner and adjust the tension of the timing chain to provide the chain tension required for replacing the first side camshaft component; Another camshaft positioning fixture is used to fix the first side camshaft after replacing the parts of the first side camshaft, so that the electric chain tensioner can be replaced with the timing chain tensioner when the timing chain is fixed in the timing position; The camshaft positioning fixture is also used to remove it from the corresponding camshaft after the electric chain tensioner is replaced with the timing chain tensioner.
6. The system according to claim 5, characterized in that, The camshaft positioning fixture includes a bent plate and a protruding rod connected at one end to the bent plate; the bent plate is provided with bolt holes; wherein: The protruding rod is used to insert into the timing positioning hole of the camshaft; The bolt holes correspond to the bolt slots on the cylinder head retainer and allow bolts to pass through to press the timing chain into the timing position.
7. The system according to claim 6, characterized in that, The bending plate includes a first metal plate extending along a first direction, a second metal plate extending from one end of the first metal plate along a second direction, and two lugs. The lugs are connected to the end of the second metal plate that is not connected to the first metal plate, and the lugs and the first metal plate are located on opposite sides of the second metal plate. Bolt holes are provided on the lugs, and the first direction and the second direction are perpendicular. Wherein: The protruding rod and the ear plate are disposed on the same side of the second metal plate, and one end of the protruding rod is fixedly connected to the second metal plate. The protruding rod is bent toward the side where the ear plate is located and extends out of the end face where the ear plate is located.
8. The system according to claim 7, characterized in that, The camshaft positioning fixture also includes a buffer element, which is disposed on the portion of the first metal plate that contacts the timing chain on the camshaft, and the shape of the buffer element matches the shape of the timing chain it contacts.
9. A robotic device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 4.
Citation Information
Patent Citations
Timing gear installing method for engjine
CN1614200A