Sectional type positioning structure of rotor engine eccentric shaft

Abstract

The utility model relates to the technical field of rotor engines, in particular to a sectional type positioning structure of an eccentric shaft of a rotor engine, which comprises an eccentric shaft and an eccentric shaft sleeve sleeved on the eccentric shaft. The combined eccentric shaft comprises an eccentric shaft sleeve, the left side and the right side of the eccentric shaft sleeve are connected with a counterweight disc and a counterweight block in a sleeved mode respectively, a limiting sleeve is connected between the counterweight block and the eccentric shaft sleeve in a sleeved mode, the eccentric shaft sleeve is connected with a needle bearing in a sleeved mode, and the needle bearing is connected with a rotor in a sleeved mode. The problems that the assembling difficulty is increased, time and labor are relatively consumed, the production and processing efficiency is reduced, the production and processing cost is increased, and the stability is poor due to the fact that all parts cannot be positioned in the assembling process are solved.

Description

Technical Field

[0001] This utility model relates to the field of rotary engine technology, specifically to a segmented positioning structure for the eccentric shaft of a rotary engine. Background Technology

[0002] In daily travel, transportation tools mainly include short-distance modes such as motorcycles, cars, and buses; long-distance transportation tools include airplanes and helicopters. All these vehicles require engines (often called internal combustion engines) to propel them by burning fossil fuels. Furthermore, many transportation vehicles in the aerospace and other fields also require engines. Engines mainly include several types, such as piston engines, turbine engines, and rotary engines; among them, rotary engines have advantages over piston engines, including fewer parts, a more compact structure, a higher power-to-weight ratio, lower vibration, and lower noise.

[0003] Chinese Patent Publication No. CN215058832U discloses a combined eccentric shaft for an aircraft rotor engine, including a main shaft, an eccentric journal sleeve, a front journal sleeve, and a rear journal sleeve. The eccentric journal sleeve is fitted onto the eccentric journal of the main shaft, the front journal sleeve is fitted onto the front journal at the front end of the eccentric journal, and the rear journal sleeve is fitted onto the rear journal at the rear end of the eccentric journal. The main shaft and the sleeve can be made of different materials; the main shaft is made of a lightweight alloy, and the sleeve is made of a high-strength alloy, so that the strength of the eccentric shaft meets the requirements while the weight is significantly reduced compared to the original eccentric shaft. In use, different material combinations of the main shaft and the sleeve can be replaced to reduce the overall weight of the engine with minimal impact on power, thereby improving the power-to-weight ratio. The sleeve can be disassembled after damage, which can improve the life of the shaft. The sleeve design reduces surface treatment processes and features a simple structure, convenient assembly and disassembly, ease of implementation, and low cost.

[0004] The combined eccentric shafts of rotary engines like those described above are difficult to meet the requirements of high power-to-weight ratio and long flight time of aero engines, and appear to be very bulky. In order to improve the output power of rotary engines, they adopt a multi-cylinder connected structure, and the rotors in adjacent cylinders can be connected by eccentric shafts. However, the existing eccentric bushings do not have a precise positioning during the assembly process, which increases the difficulty of assembly and is relatively time-consuming and labor-intensive. This reduces the efficiency of production and processing, and consequently increases the cost of production and processing. At the same time, due to the counterweight and eccentric bushings, the operating state is not stable during operation, and engine vibration and other problems are prone to occur. Utility Model Content

[0005] The purpose of this invention is to provide a segmented positioning structure for the eccentric shaft of a rotary engine, which overcomes the problems of the existing combined eccentric shaft of the rotary engine being very bulky, and the inability to position the various parts during assembly, which increases the difficulty of assembly, is relatively time-consuming and labor-intensive, reduces the efficiency of production and processing, increases the cost of production and processing, and has poor stability.

[0006] To achieve the above objectives, the technical solution adopted by this utility model to solve its technical problem is as follows:

[0007] A segmented positioning structure for the eccentric shaft of a rotary engine was designed, enabling precise positioning and assembly of various components, significantly improving production efficiency. Simultaneously, counterweights and counterweight discs are installed on both sides of the eccentric shaft sleeve to balance the instability caused by the rotation of the eccentric shaft as much as possible, thereby improving its stability. The specific scheme is as follows:

[0008] A segmented positioning structure for an eccentric shaft of a rotary engine includes an eccentric shaft and an eccentric sleeve fitted on the eccentric shaft. The axis of the eccentric shaft is parallel to the axis of the eccentric sleeve. A counterweight disc and a counterweight block are respectively fitted on the left and right sides of the eccentric sleeve.

[0009] A limiting sleeve is fitted between the counterweight and the eccentric bushing. A needle roller bearing is fitted onto the eccentric bushing, and a rotor is fitted onto the needle roller bearing.

[0010] Preferably, a first retaining ring and a second retaining ring are provided at intervals on the eccentric shaft, the inner side of the counterweight plate abuts against the first retaining ring, and the inner side of the eccentric shaft sleeve abuts against the second retaining ring;

[0011] The first retaining ring and the second retaining ring are respectively provided with a first keyway and a second keyway on their outer sides. The counterweight disk is provided with a first sleeve hole through the axis position. The eccentric bushing is provided with a second sleeve hole parallel to the axis position.

[0012] The inner ends of the first socket and the second socket are respectively provided with an outwardly extending first slide groove and a second slide groove. The first slide groove is connected to the first keyway through a first slide key, and the second slide groove is connected to the second keyway through a second slide key.

[0013] Preferably, the eccentric bushing is provided with a plurality of first weight-reducing holes that are biased to one side and opposite to the bias of the counterweight, and the counterweight plate is provided with a plurality of second weight-reducing holes that are biased to the opposite side of the bias of the counterweight.

[0014] Preferably, the left end of the eccentric shaft is provided with a threaded section, and the threaded section is threadedly connected to a nut, and the counterweight plate is clamped and fixed between the nut and the first retaining ring.

[0015] Preferably, the right end of the eccentric shaft extends to the left through a weight-reducing lubrication cavity, the right end of the eccentric shaft is provided with a key, the counterweight has a fan-shaped structure and a slot is provided at the proximal end, the key is inserted into the slot and fixedly connected to the eccentric shaft by screws.

[0016] Preferably, the limiting sleeve is fitted onto the right end of the eccentric shaft, and the left and right sides of the limiting sleeve are respectively provided with symmetrical limiting rods. The outer end face of the eccentric shaft sleeve is provided with a first limiting hole corresponding to the limiting rod, and the counterweight is provided with a second limiting hole corresponding to the limiting rod.

[0017] Preferably, the corners of the first slide groove, the second slide groove, the first keyway, and the second keyway are all machined into rounded corners, and the four corners of the first slide key and the second slide key are also machined into rounded corners.

[0018] The beneficial effects of this utility model are:

[0019] 1. This utility model, through the setting of sliding grooves, sliding keys and keyways and their cooperative connection relationship, can achieve precise positioning between various parts, and under the action of the limiting sleeve, it can further increase the accuracy of the assembly process, thereby achieving the purpose of saving time and effort, improving the assembly efficiency in the production and processing process, and reducing the production and processing cost.

[0020] 2. This utility model provides counterweights and counterweight blocks on both sides of the eccentric bushing, which are biased in opposite directions. This allows for balance on both sides of the eccentric bushing during operation, making the operation of the eccentric shaft more stable. Corresponding weight-reducing holes are also provided on it to prevent it from becoming too bulky.

[0021] 3. This utility model, through the connection between the upper limit rod and the upper limit hole of the upper limit sleeve, can effectively prevent relative rotation between the counterweight and the eccentric bushing during engine operation, thereby preventing the counterweight from losing its balance and causing various unstable situations such as engine vibration, and can further improve its stability. Attached Figure Description

[0022] Figure 1 This is a front view of the present invention;

[0023] Figure 2 This is a cross-sectional schematic diagram of the present invention;

[0024] Figure 3 This is the right view of the present invention;

[0025] Figure 4 This is a schematic diagram of the eccentric shaft in this utility model;

[0026] Figure 5 This is a schematic diagram of the counterweight disc in this utility model;

[0027] Figure 6 This is a schematic diagram of the counterweight block in this utility model;

[0028] Figure 7 This is a schematic diagram of the limiting sleeve in this utility model.

[0029] In the diagram: 1-Eccentric shaft; 11-First retaining ring; 12-Second retaining ring; 13-Threaded section; 14-Key; 15-First keyway; 151-First sliding key; 16-Second keyway; 161-Second sliding key; 17-Weight-reducing lubrication cavity; 2-Counterweight plate; 21-First socket hole; 22-Second weight-reducing hole; 23-First sliding groove; 3-Counterweight block; 31-Slot; 32-Second limiting hole; 4-Eccentric bushing; 41-Second socket hole; 42-First weight-reducing hole; 43-Second sliding groove; 44-First limiting hole; 5-Limiting sleeve; 51-Limiting rod; 6-Needle roller bearing; 7-Rotor; 8-Screw; 9-Nut. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0031] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to those skilled in the art that these specific details are not necessary to implement the present invention. In other embodiments, well-known structures, circuits, materials, or methods are not specifically described in order to avoid obscuring the present invention.

[0032] Throughout this specification, references to "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in connection with that embodiment or example is included in at least one embodiment of the present invention. Therefore, the phrases "an embodiment," "an example," "an example," or "an example" appearing in various places throughout the specification do not necessarily refer to the same embodiment or example. Furthermore, specific features, structures, or characteristics can be combined in one or more embodiments or examples in any suitable combination and / or sub-combination. Moreover, those skilled in the art will understand that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0033] In the description of this utility model, the terms "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing 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 limiting the scope of protection of this utility model.

[0034] like Figure 1-7 As shown, this utility model provides a segmented positioning structure for the eccentric shaft of a rotary engine, including an eccentric shaft 1 and an eccentric sleeve 4 fitted on the eccentric shaft 1. The axis of the eccentric shaft 1 is parallel to the axis of the eccentric sleeve 4. The eccentric shaft 1 passes through the side of the axis of the eccentric sleeve 4, that is, the axes of the eccentric shaft 1 and the eccentric sleeve 4 are parallel and have a certain distance between them, thereby achieving the purpose of eccentricity. A counterweight plate 2 and a counterweight block 3 are respectively fitted on the left and right sides of the eccentric sleeve 4, which can play a balancing role on both sides of the eccentric sleeve 4, making the running state of the eccentric shaft 1 more stable. A limit sleeve 5 is fitted between the counterweight block 3 and the eccentric sleeve 4. The limit sleeve 5 can separate the eccentric sleeve 4 and the counterweight block 3 and connect them together, fixing their eccentricity direction and facilitating their assembly, saving the trouble of repeated positioning during the assembly process. A needle roller bearing 6 is fitted on the eccentric sleeve 4, and a rotor 7 is fitted on the needle roller bearing 6 to realize the function of the rotary engine.

[0035] In the above scheme, a first retaining ring 11 and a second retaining ring 12 are spaced apart on the eccentric shaft 1. The inner side of the counterweight disk 2 abuts against the first retaining ring 11, and the inner side of the eccentric bushing 4 abuts against the second retaining ring 12. A first keyway 15 and a second keyway 16 are respectively provided on the outer sides of the first retaining ring 11 and the second retaining ring 12. A first sleeve hole 21 is provided through the axial position of the counterweight disk 2. A second sleeve hole 41 is provided parallel to the axial position of the eccentric bushing 4. A first sliding groove 23 and a second sliding groove 43 extending outward are respectively provided on the inner ends of the first sleeve hole 21 and the second sleeve hole 41. The first sliding groove 23 is connected to the first keyway 15 through a first sliding key 151, and the second sliding groove 43 is connected to the second keyway 16 through a second sliding key 161.

[0036] As an optimized technical solution of this utility model, the first retaining ring 11 and the second retaining ring 12 can realize the positioning and assembly of the counterweight plate 2 and the eccentric bushing 4, and the first sleeve hole 21 and the second sleeve hole 41 are sleeved on the eccentric shaft 1. The first sliding key 151 and the second sliding key 161 are used for limiting and preventing them from rotating arbitrarily, and play the role of positioning and assembly, so as to significantly increase the assembly efficiency.

[0037] In the above scheme, the eccentric bushing 4 is provided with multiple first weight reduction holes 42 that are biased to one side and opposite to the bias of the counterweight 3, and the counterweight plate 2 is provided with multiple second weight reduction holes 22 that are biased to the opposite side of the bias of the counterweight 3.

[0038] As an optimized technical solution of this utility model, the first weight reduction hole 42 and the second slide groove 43 are biased in opposite directions, and the second weight reduction hole 22 is biased in opposite directions to the first slide groove 23, so as to ensure that the eccentric bushing 4 and the counterweight plate 2 are biased in opposite directions. By setting the first weight reduction hole 42 and the second weight reduction hole 22, the weight of each component can be reduced, and the weight of the engine can also be reduced, thereby improving the power-to-weight ratio of the engine and making the engine less bulky.

[0039] In the above scheme, the left end of the eccentric shaft 1 is provided with a threaded section 13, and the threaded section 13 is threadedly connected to a nut 9. The counterweight plate 2 is clamped and fixed between the nut 9 and the first retaining ring 11.

[0040] As an optimized technical solution of this utility model, by utilizing the threaded connection between the threaded section 13 and the nut 9, the counterweight plate 2 can be fastened when the first sliding key 151 is positioned, thereby preventing the counterweight plate 2 from shifting during engine operation and improving its stability.

[0041] In the above scheme, a weight-reducing lubrication cavity 17 is provided through the right end of the eccentric shaft 1 to the left, and a key 14 is provided at the right end of the eccentric shaft 1. The counterweight 3 has a fan-shaped structure and a slot 31 is provided at the proximal end. The key 14 is inserted into the slot 31 and is fixedly connected to the eccentric shaft 1 by screws 8.

[0042] As an optimized technical solution of this utility model, the weight-reducing lubrication cavity 17 can achieve the purpose of weight reduction, while the key 14 is more conducive to the positioning and assembly of the counterweight 3, and can also prevent it from accidentally rotating and losing its balance during engine operation. The stability and firmness of the assembled counterweight 3 can be guaranteed by tightening the screw 8.

[0043] In the above scheme, the limiting sleeve 5 is sleeved on the right end of the eccentric shaft 1. The limiting sleeve 5 is provided with symmetrical limiting rods 51 on the left and right sides respectively. The outer end face of the eccentric shaft sleeve 4 is provided with a first limiting hole 44 corresponding to the limiting rod 51. The counterweight block 3 is provided with a second limiting hole 32 corresponding to the limiting rod 51.

[0044] As an optimized technical solution of this utility model, when the limiting sleeve 5 is sleeved on the eccentric shaft 1, it will not protrude from the outer surface of the eccentric shaft sleeve 4 to prevent affecting the assembly of the eccentric shaft sleeve 4. The limiting rods 51 provided on both ends of the limiting sleeve 5 can be inserted into the first limiting hole 44 and the second limiting hole 32 respectively. This can prevent relative rotation between the eccentric shaft sleeve 4 and the counterweight 3 during engine operation, which would cause the balance to be unbalanced, thereby reducing or eliminating the effect of the counterweight 3, and ultimately causing the engine to become unstable due to imbalance.

[0045] In the above scheme, the corners of the first slide groove 23, the second slide groove 43, the first keyway 15 and the second keyway 16 are all machined into rounded corners, and the four corners of the first slide key 151 and the second slide key 161 are also machined into rounded corners.

[0046] As an optimized technical solution of this utility model, the rounded corner design is more conducive to the smooth cooperation between various parts, and avoids jamming and other situations as much as possible, so as to improve assembly efficiency, accelerate the production and processing process, and reduce production and processing costs.

[0047] Specific implementation examples:

[0048] During assembly, the first slide key 151 and the second slide key 161 can be placed into the first keyway 15 and the second keyway 16 respectively, so that the second slide groove 43 can be aligned with the second slide key 161, so that the eccentric bushing 4 can be sleeved on the eccentric shaft 1 through the second sleeve hole 41, and its inner side abuts against the second retaining ring 12. At the same time, the first slide groove 23 can also be aligned with the first slide key 151, so that the counterweight plate 2 can be sleeved on the eccentric shaft 1 through the first sleeve hole 21, and its inner side abuts against the first retaining ring 11.

[0049] Next, the nut 9 can be screwed into the left end of the eccentric shaft 1 through the threaded engagement between the nut 9 and the threaded section 13, so that the nut 9 abuts against the outside of the counterweight plate 2 and is tightened, so as to complete the assembly of the counterweight plate 2; then the needle roller bearing 6 and the rotor 7 are assembled on the eccentric bushing 4 in sequence, and then the limiting sleeve 5 is fitted along the right end of the eccentric shaft 1, so that the limiting rod 51 on the left side of the limiting sleeve 5 is inserted into the first limiting hole 44.

[0050] Finally, the counterweight 3 is assembled in the opposite direction to the eccentric bushing 4 using the cooperation relationship between the slot 31 and the key 14. The limiting rod 51 on the right side of the limiting sleeve 5 is inserted into the second limiting hole 32, and the counterweight 3 is then tightened with screws 8. This completes the assembly of the eccentric bushing 4, the limiting sleeve 5 and the counterweight 3, making the assembly convenient and achieving precise positioning, thereby improving the assembly efficiency and saving production and processing costs.

[0051] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A segmented positioning structure for an eccentric shaft of a rotary engine, comprising an eccentric shaft (1) and an eccentric bushing (4) sleeved on the eccentric shaft (1), wherein the axis of the eccentric shaft (1) and the axis of the eccentric bushing (4) are parallel to each other, characterized in that: The eccentric bushing (4) is fitted with a counterweight disc (2) and a counterweight block (3) on its left and right sides respectively. A limiting sleeve (5) is fitted between the counterweight (3) and the eccentric bushing (4). A needle roller bearing (6) is fitted on the eccentric bushing (4), and a rotor (7) is fitted on the needle roller bearing (6).

2. The segmented positioning structure for the eccentric shaft of a rotary engine according to claim 1, characterized in that: The eccentric shaft (1) is provided with a first retaining ring (11) and a second retaining ring (12) at intervals. The inner side of the counterweight plate (2) abuts against the first retaining ring (11), and the inner side of the eccentric bushing (4) abuts against the second retaining ring (12). The first retaining ring (11) and the second retaining ring (12) are respectively provided with a first keyway (15) and a second keyway (16) on their outer sides. The counterweight plate (2) is provided with a first sleeve hole (21) through the axis position. The eccentric bushing (4) is provided with a second sleeve hole (41) parallel to the axis position. The inner ends of the first socket (21) and the second socket (41) are respectively provided with an outwardly extending first slide groove (23) and a second slide groove (43). The first slide groove (23) is connected to the first keyway (15) through a first slide key (151), and the second slide groove (43) is connected to the second keyway (16) through a second slide key (161).

3. The segmented positioning structure for the eccentric shaft of a rotary engine according to claim 1, characterized in that: The eccentric bushing (4) is provided with a plurality of first weight-reducing holes (42) that are biased to one side and opposite to the bias of the counterweight (3), and the counterweight plate (2) is provided with a plurality of second weight-reducing holes (22) that are biased to the opposite side of the bias of the counterweight (3).

4. The segmented positioning structure for the eccentric shaft of a rotary engine according to claim 2, characterized in that: The left end of the eccentric shaft (1) is provided with a threaded section (13), and the threaded section (13) is threadedly connected to a nut (9). The counterweight plate (2) is clamped and fixed between the nut (9) and the first retaining ring (11).

5. The segmented positioning structure for the eccentric shaft of a rotary engine according to claim 2, characterized in that: The eccentric shaft (1) extends to the left from the right end and is provided with a weight-reducing lubrication cavity (17). The right end of the eccentric shaft (1) is provided with a key (14). The counterweight (3) has a fan-shaped structure and a slot (31) is provided at the proximal end. The key (14) is inserted into the slot (31) and is fixedly connected to the eccentric shaft (1) by screws (8).

6. The segmented positioning structure for the eccentric shaft of a rotary engine according to claim 1, characterized in that: The limiting sleeve (5) is sleeved on the right end of the eccentric shaft (1). The limiting sleeve (5) is provided with symmetrical limiting rods (51) on the left and right sides respectively. The outer end face of the eccentric shaft sleeve (4) is provided with a first limiting hole (44) corresponding to the limiting rod (51). The counterweight (3) is provided with a second limiting hole (32) corresponding to the limiting rod (51).

7. The segmented positioning structure for the eccentric shaft of a rotary engine according to claim 2, characterized in that: The corners of the first slide groove (23), the second slide groove (43), the first keyway (15) and the second keyway (16) are all machined into rounded corners, and the four corners of the first slide key (151) and the second slide key (161) are also machined into rounded corners.

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