Side cam shaft and reciprocating air compressor

Abstract

The utility model relates to the field of air compressors, in particular to a side cam shaft and a reciprocating air compressor, according to the side cam shaft, a cam and a rotating shaft are of a split structure, the procedure of additionally installing a bearing is avoided through rotation of a cam body, and the structure of the air compressor is simplified; the key position groove formed in the eccentric hole penetrates through the cam, so that the cam is in sliding fit with the rotating shaft, the axial position of the cam and the rotating shaft can be adjusted during installation, assembly and disassembly of the air compressor are facilitated, and the disassembly and assembly efficiency of the air compressor is improved. Meanwhile, the cam is in sliding fit with the rotating shaft, and when the rotating shaft deviates or deforms, the position of the cam can be correspondingly and adaptively adjusted on the rotating shaft, so that normal operation of the transmission structure is maintained, the matching error is reduced, and the negative influence caused by deformation of the side cam shaft is reduced; the problem that an air compressor fails due to deformation of a side cam shaft of a traditional fixing structure is solved.

Description

Technical Field

[0001] This application relates to the field of air compressors, specifically a side camshaft and a reciprocating air compressor. Background Technology

[0002] Bearings are important components of the drive mechanism in reciprocating air compressors. Traditionally, bearings are mainly used for support.

[0003] The camshaft is an important component in air compressors and piston engines, typically used to control the opening and closing of valves. The camshaft requires high rotational speeds and must withstand significant torque; therefore, it is generally made of high-quality alloy steel or alloy steel. Because the valve movement pattern affects the power and operating characteristics of an air compressor or engine, the design of the camshaft plays a crucial role in the design process of air compressors.

[0004] Traditional reciprocating air compressors use a crank-cam mechanism for the side camshaft drive, where an eccentric wheel on the outside of the crank drives the piston in reciprocating motion. The crank-cam mechanism has bearings on the outside of the crank, and these bearings are fixedly connected to the crank via key pins, making disassembly and assembly difficult. Furthermore, under long-term high-speed operation, the side camshaft inevitably undergoes some deformation or misalignment, especially at the end of the shaft furthest from the output motor and at the cam mounting position. Under centrifugal force, the distal end of the shaft or the cam mounting position is prone to misalignment, causing the cam's position to change. This affects the internal mechanical transmission efficiency of the air compressor and also complicates later maintenance and assembly. Utility Model Content

[0005] To solve, or at least partially solve, the above-mentioned technical problems, this application provides a side camshaft, comprising:

[0006] A rotating shaft, the surface of which is provided with a key arranged along the axial direction of the rotating shaft;

[0007] A cam includes an inner ring component and an outer ring component. The outer ring component is sleeved on the outside of the inner ring component and is coaxially arranged with the inner ring component. The outer ring component is rotatably connected to the inner ring component. The inner ring component has a through-hole eccentric hole, and a keyway is formed on the inner wall of the eccentric hole. The keyway extends through to both sides of the inner ring component.

[0008] The rotating shaft is disposed through the eccentric hole and engages with the cam, and the key is disposed through the keyway. The cam can move along the axial direction of the rotating shaft through the engagement of the keyway and the key.

[0009] Optionally, the two sides of the key along the circumference of the rotating shaft are interference-fitted with the inner wall of the keyway, and the side of the key away from the rotating shaft is clearance-fitted or interference-fitted with the inner wall of the keyway.

[0010] Optionally, the axial length of the key along the rotating shaft is greater than the length of the keyway.

[0011] Optionally, the key is provided with at least two limiting structures that can protrude from the surface of the key, and the cam is located between the two limiting structures.

[0012] Optionally, the height of the key is at least partially greater than the depth of the keyway, or the width of the key is at least partially greater than the width of the keyway, to limit the axial movement of the cam along the shaft.

[0013] Optionally, the number of key slots is at least two, and the at least two key slots are evenly distributed around the circumference of the eccentric hole, with the shaft key corresponding to each of the key slots.

[0014] Optionally, at least two cams are provided, and at least two of the cams are eccentrically arranged, with the spacing between adjacent cams being adjustable.

[0015] This application provides a reciprocating air compressor, comprising:

[0016] The side camshaft as described above;

[0017] A drive motor, the output end of which is connected to the rotating shaft of the side camshaft;

[0018] A piston mechanism is provided, with a cam connected to the side camshaft; the rotation of the side camshaft is used to convert the rotational motion output by the drive motor into the reciprocating motion of the piston mechanism.

[0019] The side camshaft provided in this application has a split structure between the cam and the shaft. The rotation of the cam body eliminates the need for additional bearing installation, simplifying the air compressor structure. A keyway in the eccentric hole runs through the cam, allowing for a sliding fit between the cam and the shaft. This enables adjustment of the axial position during installation, facilitating the assembly and disassembly of the air compressor and improving its efficiency. Furthermore, the sliding fit between the cam and the shaft allows the cam to adaptively adjust its position on the shaft when it shifts or deforms, maintaining the normal operation of the transmission structure, reducing fit errors, and mitigating the negative impacts of side camshaft deformation. This avoids the operational malfunctions of traditional fixed-structure side camshafts caused by deformation.

[0020] The reciprocating air compressor provided in this application also possesses all the advantages described above. Attached Figure Description

[0021] To more clearly illustrate the embodiments of this application, the relevant drawings will be briefly described below. It is understood that the drawings described below are only for illustrating some embodiments of this application, and those skilled in the art can obtain many other technical features and connections not mentioned herein based on these drawings.

[0022] Figure 1 This is a schematic diagram of the side camshaft structure of this application;

[0023] Figure 2 This is a schematic diagram of the structure of the rotating shaft of the side camshaft in this application;

[0024] Figure 3 This is a schematic diagram of the cam structure of the side camshaft in this application;

[0025] Figure 4 This is a side view of one embodiment of the side camshaft of this application;

[0026] Figure 5 This is a side view schematic diagram of one embodiment of the side camshaft of this application;

[0027] Figure 6 This is a schematic diagram of the installation state of one embodiment of the side camshaft of this application.

[0028] Explanation of reference numerals in the attached figures:

[0029] 100. Shaft; 110. Keyway;

[0030] 200, Cam; 201, First Cam; 202, Second Cam; 203, Third Cam; 210, Inner Ring Component; 211, Eccentric Hole; 212, Keyway; 220, Outer Ring Component;

[0031] 300. Bearings;

[0032] 400. Drive motor; 410. Output shaft;

[0033] 500. Piston mechanism. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0035] In existing technologies, the side cam structure used in reciprocating air compressors is a type where the shaft and cam are integrally formed, with the shaft and cam fixed relative to each other. As is well known, during long-term high-speed rotation, the shaft is affected by centrifugal force, causing the end of the shaft furthest from the drive motor to easily shift, resulting in eccentricity. This leads to a deviation in the cam's motion trajectory on the shaft, thus affecting the transmission efficiency of the air compressor's internal transmission mechanism. Simultaneously, the eccentric rotation of multiple cams on the shaft also generates radial shear force, causing bending deformation of the shaft, similarly impacting the air compressor's efficient operation. The eccentricity of this integral camshaft structure is difficult to repair, easily leading to shaft failure and high costs.

[0036] Another type is a detachable combination structure of shaft and cam, in which the shaft and cam are engaged by a key. However, the engagement of traditional key and keyway is a fixed structure. When the cam is fitted onto the shaft, the keyway locks the key after the key engages with it, and the cam and shaft remain fixed. Therefore, the same problem as mentioned above will occur. Even if the position between the cam and shaft is adjustable, it still requires manual intervention and adjustment by disassembly, which increases maintenance costs.

[0037] When assembling a traditional cam and shaft structure, the relative position of the cam and piston mechanism must be considered to ensure the ease of installation of the piston mechanism. This places high demands on the dimensional accuracy of the assembly, which obviously increases the difficulty of camshaft assembly.

[0038] In view of this, the embodiments of this patent propose a side camshaft and a reciprocating air compressor to solve the above-mentioned technical problems.

[0039] The technical solutions in the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0040] First Implementation Method

[0041] like Figure 1 As shown, this embodiment provides a side camshaft, which includes a rotating shaft 100 and a cam 200. The cam 200 is sleeved on the outer surface of the rotating shaft 100. The rotation of the rotating shaft 100 drives the cam 200 to rotate. The cam 200 is eccentrically set with the rotating shaft 100, so the rotational motion of the rotating shaft 100 is converted into the reciprocating motion of the cam 200.

[0042] In this embodiment, the eccentric setting of the cam 200 and the rotating shaft 100 can be understood as follows: the axis of the cam 200 is parallel to but does not coincide with the axis of the rotating shaft 100. The cam 200 has at least a portion that protrudes from the outer peripheral surface of the rotating shaft 100. Thus, when the rotating shaft 100 rotates and drives the cam 200 to rotate, the rotational motion of the rotating shaft 100 is converted into the reciprocating motion of the cam 200, thereby enabling the output of a reciprocating force in the linear direction.

[0043] Please see Figure 2 and Figure 3 In this embodiment, the surface of the rotating shaft 100 is provided with a key 110 arranged along the axial direction of the rotating shaft 100; the cam 200 includes an inner ring component 210 and an outer ring component 220. The outer ring component 220 is sleeved on the outside of the inner ring component 210 and is coaxially arranged with the inner ring component 210. The outer ring component 220 is rotatably connected to the inner ring component 210.

[0044] like Figure 3 As shown, the inner ring component 210 has a through-hole eccentric hole 211, and a key groove 212 is provided on the inner wall of the eccentric hole 211, which extends to both sides of the inner ring component 210.

[0045] In this embodiment, the rotating shaft 100 is disposed through the eccentric hole 211 and cooperates with the cam 200. The rotating shaft 100 and the eccentric hole 211 are interference-fitted. The shaft key 110 is disposed through the keyway 212. The cooperation relationship between the shaft key 110 and the keyway 212 keeps the rotating shaft 100 and the inner ring component 210 relatively fixed in the circumferential direction, so that the rotation of the shaft key 110 can drive the inner ring component 210 to rotate.

[0046] It is worth mentioning that the key slot 212 in this embodiment is a through slot that passes through the cam 200. Therefore, the shaft key 110 is not restricted in its axial direction after passing through the key slot 212. The shaft key 110 and the key slot 212 can slide together. Therefore, the cam 200 can move along the axial direction of the rotating shaft 100 through the sliding engagement between the key slot 212 and the shaft key 110.

[0047] In this embodiment, the cam 200 can move along the axial direction of the rotating shaft 100 without manual adjustment. During operation, the rotating shaft 100 is fixed by the bearing 300. The cam 200 is externally connected to a piston mechanism 500 and other supporting motion mechanisms. The cam 200 can be restricted by the connecting force of the piston mechanism 500 and other supporting motion mechanisms. When the rotating shaft 100 undergoes a certain degree of displacement or bending due to long-term high-speed operation, the cam 200 will adaptively slide along the axial direction of the rotating shaft 100 under the connecting force of the piston mechanism 500 and other supporting motion mechanisms. Figure 1 The arrow in the diagram indicates the adaptive sliding direction of cam 200. Thus, cam 200 has an adaptive adjustment function when the shaft 100 is offset; cam 200 will move freely on the shaft 100 to a suitable position, minimizing power transmission loss and ensuring the air compressor's operating efficiency.

[0048] The side camshaft provided in this embodiment has a split structure between the cam 200 and the rotating shaft 100. The keyway 212 provided in the eccentric hole 211 passes through the cam 200, so that the cam 200 and the rotating shaft 100 slide together. When the rotating shaft 100 is offset or deformed, the cam 200 can adaptively adjust its position on the rotating shaft 100 to maintain the normal operation of the transmission structure, reduce the fit error, and reduce the negative impact caused by the deformation of the side camshaft. This improvement can be said to improve the fault tolerance of the air compressor and avoid the problem of air compressor operation failure caused by the deformation of the side camshaft of the traditional fixed structure.

[0049] Furthermore, the cam 200 body includes an inner ring component 210 and an outer ring component 220 that rotate relative to each other. The cooperation between the inner ring component 210 and the outer ring component 220 avoids the additional process of installing bearings, simplifying the air compressor structure. The cam 200 has a sliding fit with the rotating shaft 100, and its axial position can be adjusted during installation, which facilitates the assembly and disassembly of the air compressor and improves the assembly and disassembly efficiency of the air compressor.

[0050] In this embodiment, the shapes of the key 110 and the keyway 212 are not limited, as long as they can form a limit in the circumferential direction of the rotating shaft 100 and slide together in the axial direction of the rotating shaft 100.

[0051] In this embodiment, the two circumferential surfaces of the key 110 along the rotating shaft 100 are interference-fitted with the inner wall of the keyway 212 to ensure that the rotating shaft 100 and the cam 200 are locked together, and the rotational force of the rotating shaft 100 is directly transmitted to the cam 200. The side surface of the key 110 away from the rotating shaft 100 is either clearance-fitted or interference-fitted with the inner wall of the keyway 212. The interference fit ensures a good fit between the key 110 and the keyway 212, increasing the contact surface, while the clearance fit reduces the sliding resistance between them.

[0052] In one embodiment, such as Figure 1 As shown, the axial length of the key 110 along the rotating shaft 100 is greater than the length of the keyway 212, and the length of the keyway 212 is the same as the axial length of the keyway 212 along the eccentric hole 211. This allows the cam 200 to have a certain sliding distance on the rotating shaft 100, improving the adjustable range. Preferably, the key 110 extends to the positions where the bearings 300 are installed at both ends of the rotating shaft 100, so that the cam 200 can be adjusted on the surface of the rotating shaft 100 after it is installed, improving assembly efficiency.

[0053] like Figure 6 As shown, in this embodiment, the side camshaft has a cam 200 sleeve on the rotating shaft 100. The inner ring component 210 in the middle of the cam 200 has an eccentric hole 211 that cooperates with the rotating shaft 100. The outer ring component 220 of the cam 200 is connected to the piston mechanism 500.

[0054] Traditional air compressors use a crank-cam mechanism for their internal transmission. The crank-cam mechanism includes a rotating shaft, a crank, eccentric wheels, and bearings. The crank is sleeved on the outside of the rotating shaft, and two bearings are set on opposite sides of the crank. Multiple eccentric wheels are set between the two bearings. The rotation of the rotating shaft drives the eccentric wheels to rotate. The eccentric wheels abut against the piston rod, and the rotation of the eccentric wheels drives the piston rod to reciprocate. In this way, the rotational motion of the rotating shaft can be changed into the linear reciprocating motion of the piston rod.

[0055] Compared with the prior art, this application does not use an eccentric wheel, but uses a cam 200 with a self-rotating function. The cam 200 is sleeved on the outside of the rotating shaft 100. The cam 200 has an eccentric hole 211. The eccentric setting of the cam 200 can drive the piston mechanism 500 to reciprocate. The piston mechanism 500 of this application is coaxially set with the air compressor cylinder and can move continuously along the axis of the cylinder. Thus, the piston rod pushes the piston to move, and the circular motion of the rotating shaft 100 is converted into the linear reciprocating motion of the piston mechanism 500.

[0056] Moreover, compared with the traditional eccentric wheel drive method, the overall structure of the side camshaft in this embodiment is simpler, which reduces production costs on the one hand, and reduces the difficulty of disassembling and assembling the side camshaft on the other hand, thus improving the disassembly and assembly efficiency of the side camshaft.

[0057] Furthermore, the keyway 212 provided in the eccentric hole 211 of the cam 200 extends through the cam 200, thereby enabling a sliding fit between the rotating shaft 100 and the cam 200. During the installation of the air compressor's supporting motion mechanism, the installation position of the cam 200 is adjustable. This facilitates the relative adjustment of the positions of other structures installed on the rotating shaft 100 after the cam 200 is installed, thus improving the adjustment flexibility of the internal structure of the air compressor.

[0058] For example, in some embodiments, more than one cam 200 is provided on the rotating shaft 100. The positions of different cams 200 are relatively fixed. All cams 200 can be fitted onto the rotating shaft 100 first, and then their positions can be finely adjusted to further limit them. In this way, the cams 200 in this embodiment are more efficient to install and remove, and more flexible to use.

[0059] like Figure 4 and Figure 5 As shown, the rotating shaft 100 of the side camshaft in this embodiment is provided with three cams 200. The three cams 200 are eccentrically arranged, and the spacing between adjacent cams 200 is adjustable. The cams 200 include a first cam 201, a second cam 202, and a third cam 203. During assembly, the first cam 201, the second cam 202, and the third cam 203 can be sequentially fitted onto the rotating shaft 100. The specific positions of the first cam 201, the second cam 202, and the third cam 203 can be adjusted. The installation method is flexible and efficient.

[0060] In this embodiment, there are at least two key slots 212, which are evenly distributed around the circumference of the eccentric hole 211. The shaft key 110 is correspondingly arranged with the key slot 212. The cooperation between the multiple shaft keys 110 and the key slots 212 can ensure the smoothness of the cam 200 when sliding.

[0061] Please refer to Figure 3 As shown, in one embodiment, there are three key slots 212, which are evenly distributed around the eccentric hole 211 in a circumferential manner.

[0062] Traditionally, a non-through connection method is used between the rotating body and the bearing. For example, a non-through groove is cut along the wall of the hole in the middle of the bearing. During installation, the bearing is fitted with the rotating body using a key pin, and their relative positions are determined after the fit is completed and cannot be changed.

[0063] Because the traditional swivel joint and bearing are connected by only one key pin, after a long period of use, stress concentration is likely to occur at the key pin between the swivel joint and the bearing, causing stress torsion of the shaft itself, which is not conducive to the service life of the shaft.

[0064] Based on this, in this embodiment, the number of key slots 212 provided in the eccentric hole 211 is three, and they are evenly distributed around the circumference of the eccentric hole 211. This avoids the defect of stress concentration when the rotating shaft 100 and the cam 200 are running, improves the service life of the rotating shaft 100 and the cam 200, and thus improves the running stability of the side cam shaft.

[0065] In this embodiment, the rotating shaft 100 is provided with three shaft keys 110 that are adapted to the three key slots 212 respectively. The shaft keys 110 extend into the key slots 212 and slide in cooperation with the cam 200 along its axial direction.

[0066] Traditionally, the shaft and bearing are positioned by key pins. For example, a keyway is opened inside the middle hole of the bearing, and then the shaft and bearing are fixedly connected by key pins inserted into the keyway, so that the bearing and shaft move synchronously.

[0067] In this embodiment, a key 110 is provided on the outside of the rotating shaft 100 to mate with the keyway 212. The rotating shaft 100 and the cam 200 are connected by the key 110 and the keyway 212. The rotating shaft 100 transmits rotational power to the cam 200 through the engagement of the key 110 and the keyway 212. Then, other positioning elements are used to further define the position of the cam 200 in the axial direction of the rotating shaft 100.

[0068] Therefore, the installation of cam 200 is divided into two steps. The first step is pre-installation, which is to put cam 200 onto rotating shaft 100. The second step is after the other structures are installed. At this time, the position of cam 200 can be determined. The position is limited by the positioning component, which improves the convenience and flexibility of cam 200 installation and removal.

[0069] In one embodiment, the key 110 is provided with at least two limiting structures that can protrude from the surface of the key 110, and the cam 200 is located between the two limiting structures. The limiting structure can block and limit the cam 200 to prevent the cam 200 from moving too far, and the two limiting structures control the cam 200 within a preset range.

[0070] In other words, the cam 200 in this embodiment cannot slide arbitrarily; its sliding range needs to be limited. This range should ensure that the movement of the cam 200 does not affect the operation of the piston mechanism 500.

[0071] The limiting structure only needs to limit the cam 200 while ensuring the normal operation of the side camshaft. The specific structural form of the limiting structure is not limited, and it can be a snap-fit ​​or a positioning ring, etc.

[0072] In one embodiment, the limiting structure and the key 110 are detachably connected. The limiting structure is installed after the cam 200 is installed on the rotating shaft 100 for limiting.

[0073] In one embodiment, the limiting structure can be an elastically adjustable structure. Pressing the limiting structure can cause it to retract toward the surface of the key 110 to facilitate the installation of the cam 200. After the pressing is released, the limiting structure protrudes from the surface of the key 110 to limit the cam 200.

[0074] Of course, the aforementioned limiting structure can not only be set on the key 110, but also on the surface of the rotating shaft 100 based on the same limiting function.

[0075] As a further improvement, in one embodiment, the limiting structure may not be provided, and the structural dimensions of the key 110 may be modified to achieve the limiting effect. For example, the height of the key 110 may be at least partially greater than the depth of the keyway 212, or the width of the key 110 may be at least partially greater than the width of the keyway 212. The larger portion can limit the axial movement of the cam 200 along the shaft 100.

[0076] In this embodiment, the cam 200 includes an inner ring component 210 and an outer ring component 220; the inner ring component 210 cooperates with the rotating shaft 100, and the outer ring component 220 is connected to the piston mechanism 500.

[0077] That is, the eccentric hole 211 is opened in the inner ring component 210, and the inner ring component 210 and the outer ring component 220 are engaged by multiple balls.

[0078] The rotation of the shaft 100 will cause the inner ring component 210 to rotate eccentrically, and the outer ring component 220 will follow the inner ring component 210 to rotate eccentrically. During the eccentric rotation of the inner ring component 210, the piston mechanism 500 will reciprocate.

[0079] The cam 200 can be pre-installed during the installation process with the shaft 100, and then the position of the bearing can be limited by other fasteners.

[0080] Specifically, the cam 200 is provided with positioning rings on both sides, which are used to limit the position of the cam 200.

[0081] Traditional bearings and shafts are fixedly connected by key pins. On the one hand, this causes stress concentration and the shaft to easily twist, affecting its service life. On the other hand, it is not conducive to the disassembly and assembly of bearings, which reduces the efficiency of disassembly and assembly of the internal structure of the air compressor.

[0082] In one embodiment, the cam 200 has mating grooves on opposite sides along its axial direction, and one end of the positioning ring is embedded in the mating groove.

[0083] That is, the positioning ring is located on the outer ring component 220 of the cam 200 to limit the position of the cam 200 along the rotation axis 100. In this embodiment, the positioning ring improves the assembly and disassembly efficiency of the cam 200 by positioning the cam 200.

[0084] Alternatively, in some other embodiments, other structures may be used to limit the position of the cam 200, which are not limited here.

[0085] Furthermore, the mating groove is an annular groove, and the annular groove is located outside the cam 200, and the annular groove is coaxial with the cam 200.

[0086] Second Implementation Method

[0087] This embodiment provides a reciprocating air compressor, which includes a compression mechanism and a drive mechanism. The compression mechanism includes a compression cylinder and a piston mechanism 500 inside the compression cylinder. The piston mechanism 500 performs piston movement inside the compression cylinder to achieve normal operation of the air compressor. The operation of the compression mechanism of the reciprocating air compressor is common knowledge in the field and will not be described in this embodiment.

[0088] The reciprocating air compressor in this embodiment is internally equipped with the side camshaft mentioned in the above embodiment, such as... Figure 6As shown, the cam 200 in the side camshaft is connected to the piston mechanism 500. The drive mechanism includes a drive motor 400 and an output shaft 410, which is connected to the rotating shaft 100 of the side camshaft. The rotation of the side camshaft is used to convert the rotational motion output by the drive motor 400 into the reciprocating motion of the piston mechanism 500, thereby driving the piston mechanism 500 to perform piston motion.

[0089] As can be seen, the reciprocating air compressor in this embodiment also has an air tank and a unit base (not shown in the figure). The air tank is connected to the compression cylinder and is used to store compressed air. The unit base is used to install and fix the compression mechanism, the drive mechanism and the air tank.

[0090] The reciprocating air compressor provided in this embodiment has the drive mechanism mentioned in the above embodiments, so this embodiment also has all the advantages mentioned above, and will not be repeated here.

[0091] Third Implementation Method

[0092] This embodiment provides a method for fitting a side camshaft to solve the problems in the prior art where the shaft offset and deformation leads to a decrease in the efficiency of the transmission mechanism and the inconvenience of assembling the side camshaft.

[0093] The method includes the following steps:

[0094] An eccentric hole 211 is provided on the cam 200 to cooperate with the rotating shaft 100;

[0095] A keyway groove 212 is formed on the surface of the eccentric hole 211, extending axially from the eccentric hole 211 to both sides of the cam 200. Unlike the prior art, the keyway groove 212 in this embodiment is a through groove, and the keyway groove 212 extends axially from the eccentric hole 211 to the cam 200.

[0096] A key 110 extending axially along the surface of the rotating shaft 100 is provided. Unlike the prior art, the key 110 does not completely lock into the key slot 212 when it engages with the key slot 212. The key 110 and the key slot 212 are only limited in the circumferential direction of the rotating shaft 100. In the axial direction of the rotating shaft 100, the key 110 passes through the key slot 212 and can slide with the key slot 212.

[0097] The method in this embodiment allows the position of the cam 200 on the rotating shaft 100 to be adjustable by sliding the keyway 212 with the shaft key 110.

[0098] It should be noted that the position of cam 200 on shaft 100 is adjustable. This adjustment is not only made during the installation of cam 200 to facilitate assembly, but also during the normal operation of the reciprocating air compressor after cam 200 is assembled, when shaft 100 drives cam 200 to rotate, cam 200 can be slightly adjusted in the axial direction relative to shaft 100 during its movement.

[0099] Through this method, the cam 200 adaptively adjusts during operation to accommodate the offset caused by the deviation or deformation of the shaft 100, thereby reducing the fit error and improving the tolerance of the shaft system fit.

[0100] Specifically, during operation, the rotating shaft 100 is fixed by the bearing 300, and the cam 200 is externally connected to the piston mechanism 500 and other supporting motion mechanisms. The cam 200 is constrained by the connecting force of the piston mechanism 500 and other supporting motion mechanisms. When the rotating shaft 100 undergoes a certain degree of displacement or bending during long-term high-speed operation, the cam 200 will adaptively slide along the axial direction of the rotating shaft 100 under the connecting force of the piston mechanism 500 and other supporting motion mechanisms. Thus, the cam 200 has an adaptive adjustment function in the case of the rotating shaft 100's displacement. The cam 200 will move freely on the rotating shaft 100 to a suitable position, minimizing power transmission loss and ensuring the operating efficiency of the air compressor.

[0101] The side camshaft fitting method provided in this embodiment has a sliding fit between the cam 200 and the rotating shaft 100. When the rotating shaft 100 is offset or deformed, the cam 200 can adaptively adjust its position on the rotating shaft 100 to maintain the normal operation of the transmission structure, reduce fitting errors, reduce the negative impact caused by the deformation of the side camshaft, and avoid the problem of air compressor operation failure caused by the deformation of the side camshaft of the traditional fixed structure.

[0102] In one embodiment, the method further includes a limiting step, comprising providing at least two limiting structures on the key 110 that protrude from the surface of the key 110, so that the cam 200 is limited between the two limiting structures. The limiting structures can block and limit the cam 200, preventing the cam 200 from moving too far, and the two limiting structures control the cam 200 within a preset range.

[0103] This embodiment also provides a method for assembling a side camshaft to solve the problem of inconvenient side camshaft assembly in the prior art.

[0104] The assembly method includes pre-installation and adjustment steps. Specifically, the installation of the cam 200 is divided into two steps:

[0105] The first step is the pre-installation step, in which the cam 200 is fitted onto the rotating shaft 100, and the cam 200 is located within the sliding area of ​​the rotating shaft 100. In this step, the mechanism that matches the cam 200 is installed, for example, the piston mechanism 500 is installed on the outer ring component 220 of the cam 200.

[0106] The second adjustment step is to determine the position of cam 200 after the other structures are installed. Cam 200 is moved along the axis of rotating shaft 100 to be in the optimal position. This position is the optimal position before rotating shaft 100 is offset or deformed. In this position, if rotating shaft 100 is not offset or deformed, cam 200 is only subjected to its own rotational force and the thrust on piston mechanism 500. The position of cam 200 on rotating shaft 100 remains unchanged.

[0107] Compared to the existing technology where the cam 200 and the rotating shaft 100 are locked together by a key pin, this method enables the cam 200 to be quickly assembled and disassembled, improving the convenience and flexibility of the cam 200 assembly and disassembly.

[0108] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0109] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0110] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0111] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0112] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A side camshaft, characterized in that, include: A rotating shaft (100) has a key (110) on its surface arranged along the axial direction of the rotating shaft (100); The cam (200) includes an inner ring component (210) and an outer ring component (220). The outer ring component (220) is sleeved on the outside of the inner ring component (210) and is coaxially arranged with the inner ring component (210). The outer ring component (220) is rotatably connected to the inner ring component (210). The inner ring component (210) has a through-hole (211), and a key groove (212) is provided on the inner wall of the eccentric hole (211), which extends to both sides of the inner ring component (210). The rotating shaft (100) is disposed through the eccentric hole (211) and cooperates with the cam (200). The key (110) is disposed through the keyway (212). The cam (200) can move along the axial direction of the rotating shaft (100) through the cooperation of the keyway (212) and the key (110).

2. The side camshaft according to claim 1, characterized in that, The two sides of the key (110) along the circumference of the rotating shaft (100) are interference-fitted with the inner wall of the keyway (212), and the side of the key (110) away from the rotating shaft (100) is clearance-fitted or interference-fitted with the inner wall of the keyway (212).

3. The side camshaft according to claim 1, characterized in that, The axial length of the key (110) along the shaft (100) is greater than the length of the keyway (212).

4. The side camshaft according to claim 3, characterized in that, The key (110) is provided with at least two limiting structures that can protrude from the surface of the key (110), and the cam (200) is located between the two limiting structures.

5. The side camshaft according to claim 3, characterized in that, The height of the key (110) is at least partially greater than the depth of the keyway (212), or the width of the key (110) is at least partially greater than the width of the keyway (212), to limit the axial movement of the cam (200) along the shaft (100).

6. The side camshaft according to claim 1, characterized in that, The number of key slots (212) is at least two, and at least two key slots (212) are evenly distributed around the circumference of the eccentric hole (211). The shaft key (110) is provided in a one-to-one correspondence with the key slots (212).

7. The side camshaft according to any one of claims 1-6, characterized in that, At least two cams (200) are provided, and at least two of the cams (200) are eccentrically arranged, and the distance between adjacent cams (200) is adjustable.

8. A reciprocating air compressor, characterized in that, include: The side camshaft as described in any one of claims 1-7; A drive motor (400) has its output end connected to the rotating shaft (100) of the side camshaft; Piston mechanism (500), cam (200) connected to the side camshaft; The rotation of the side camshaft is used to convert the rotational motion output by the drive motor (400) into the reciprocating motion of the piston mechanism (500).

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