Engine with balancing device
By designing a one-way device in the engine to ensure one-way outflow of lubricant oil, the power loss and lubricant stirring problems caused by the dual-balanced device design are solved, and more efficient power output and a more compact engine design are achieved.
Patent Information
- Application Number
- CN202421757223.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-24
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-07-24
AI Technical Summary
When designing a dual balance device, an existing engine with a dual balance device may cause a balance device to approach the lubricant oil level, resulting in power loss and lubricant stirring, further causing vibration and power loss.
An engine with a one-way device is designed, by setting an outlet outlet at the lowest point of the crankshaft chamber, the lubricating oil is discharged to the oil pan when the piston is traveling down, and a one-way device is provided at the outlet outlet to ensure that the lubricating oil flows out in one direction and prevent the rotating parts from stirring the lubricating oil.
It effectively reduces the lubricant disturbance caused by rotation of the internal components of the engine, prevents power loss, and at the same time, the unbalanced force and unbalanced torque of the engine are greatly offset by the dual balance device, improving the commercial properties of power output.
Smart Images
Figure CN222863990U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to an engine with a balancing device, in particular to an engine with a balancing device suitable for a fuel motorcycle. Background Art
[0002] Figure 1 The figure is a cross-sectional view of an existing engine with a single balancing device, showing an existing piston engine 91, which has a connecting rod mechanism 923 that converts the reciprocating linear motion of a piston (not shown) into the rotational motion of a crankshaft 921, and during the operation of the engine 91, an unbalanced force is generated due to the actuation of the piston and the connecting rod mechanism 923, causing vibration of the engine 91 itself. A common corresponding method to offset this unbalanced force is to add a first balancing device 93, and the unbalanced force generated by the power transmission unit (piston, connecting rod mechanism 923) can be offset by the counterweight block offset from the axis of the first balancing device 93 and the movement of the crankshaft 921.
[0003] Although Figure 1 The engine 91 shown can counteract the unbalanced force, but will generate unbalanced torque. Therefore, a more advanced method is to use a double balancing device configuration. Figure 2 The cross-sectional view of an existing engine with dual balancing devices can greatly eliminate the unbalanced force and unbalanced torque of the engine 91'. The engine 91' using dual balancing devices (first balancing device 93' and second balancing device 94') has a certain configuration space due to the design and configuration of the dual balancing shafts (first balancing shaft 931' and second balancing shaft 941'). In addition to the power loss caused by the second transmission element 932' and the third transmission element 942' driving them respectively, the first balancing shaft 931' or the second transmission element 932' may also cause power loss due to the stirring of the lubricating oil 96' liquid level.
[0004] For this reason, the inventor, in the spirit of active invention, has been eager to think of an engine with a balancing device that can solve the above-mentioned problems. After several studies and experiments, the present utility model is finally completed. Summary of the invention
[0005] The main purpose of the utility model is to provide an engine with a balancing device, wherein a discharge port is provided at the lowest point of the crank chamber so that the lubricating oil can be discharged to the oil pan through the discharge port when the piston has a downward stroke, and the discharge port is formed to be recessed toward one side of the crank chamber, and a one-way device is provided so that the lubricating oil in the crank chamber can be discharged in one direction, thereby preventing the lubricating oil level in the oil pan in the oil chamber from being disturbed when the crankshaft or the balancing device rotates, so as to prevent excessive disturbance of the lubricating oil and thus causing power loss.
[0006] To achieve the above object, the engine with a balancing device of the utility model includes a power transmission unit, a first balancing device, a second balancing device and a crankcase assembly. The power transmission unit includes a connecting rod mechanism, a crankshaft and a first transmission element disposed on the crankshaft.
[0007] The first balancing device includes a first balancing shaft and a second transmission element arranged on the first balancing shaft. The first transmission element drives the second transmission element to operate. The first balancing shaft receives power from the crankshaft through the second transmission element arranged at the shaft end, so that the rotation speed of the first balancing shaft is the same as that of the crankshaft and the direction is opposite. The unbalanced force of the engine is offset by the movement of the crankshaft. The second balancing device includes a second balancing shaft and a third transmission element arranged on the second balancing shaft. The first transmission element drives the third transmission element to operate. The second balancing shaft receives power from the crankshaft through the third transmission element arranged at the shaft end, so that the rotation speed of the second balancing shaft is the same as that of the crankshaft and the direction is opposite. The unbalanced force and unbalanced torque of the engine are offset by the movement of the crankshaft.
[0008] In addition, the crankcase assembly is provided with a crankcase accommodating space, and a main partition is provided on the wall of the crankcase assembly. The crankcase accommodating space is separated into a crankshaft chamber and an oil chamber by the main partition. The crankshaft chamber is connected to the oil chamber by a discharge port, and the discharge port is provided with a one-way device so that the lubricating oil in the crankshaft chamber flows to the oil chamber in a single direction, and then the lubricating oil is accumulated in an oil pan, thereby separating the lubricating oil in the oil pan to prevent the lubricating oil level from being stirred when the crankshaft or the balancing device rotates and causing power loss.
[0009] The crank chamber may include a buffer portion, which may be located between the first balancing device and the discharge port, and is generally surrounded by a scraper, a guide plate, and the discharge port, and is used to accommodate a portion of the lubricating oil flowing down from the crank chamber.
[0010] The wall of the crankcase assembly may be provided with a scraper and a guide plate, both of which may be located between the first balancing device and the buffer portion, wherein the scraper is used to help scrape off the lubricating oil attached to the first balancing device, and the guide plate is used to guide the lubricating oil in the crankcase chamber to flow to the buffer portion.
[0011] The wall of the crankcase assembly may be provided with a plurality of through holes, which may be located in the oil chamber to balance the internal pressure in the oil chamber, allowing the lubricating oil to flow back smoothly and circulate with the oil chamber to balance the lubricating oil level and prevent excessive disturbance of the lubricating oil in the oil chamber.
[0012] The first balancing device can be located below the crankshaft and facing the front of the engine, and the second balancing device can be located above the crankshaft and facing the rear of the engine, so that the appearance design of the engine is more compact.
[0013] A line connecting a first balancing shaft center of the first balancing shaft and a second balancing shaft center of the second balancing shaft may pass through a crankshaft center of the crankshaft.
[0014] The above-mentioned main partition can roughly enclose the movement trajectory of the crankshaft, the first balancing shaft and the second balancing shaft, thereby separating the crankshaft, the first balancing device and the second balancing device from the lubricating oil area of the oil pan, forming an independent crankshaft chamber and engine oil chamber to prevent the stirring of the lubricating oil level and cause power loss.
[0015] The rotation direction of the first balancing device may be clockwise, which is the direction from the guide plate to the scraper plate.
[0016] The crankcase assembly may include a left crankcase and a right crankcase, which may be divided by a dividing surface. The crankcase assembly may have a cylindrical portion, which may be composed of the left crankcase and the right crankcase. When viewed from the front, the central axis of the cylindrical portion cannot be located in the same plane as the dividing surface, so that the one-way device is roughly centered when viewed from the front.
[0017] One side of the one-way device may be adjacent to the dividing surface of the crankcase assembly.
[0018] The above summary and the following detailed description are exemplary in nature and are intended to further illustrate the scope of the patent application of the present utility model. Other purposes and advantages of the present utility model will be described in the subsequent specific implementation methods and drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 A cross-sectional view of an existing engine with a single balancing device
[0020] Figure 2 The figure is a cross-sectional view of a conventional engine with a double balancing device.
[0021] Figure 3 It is a cross-sectional view of an engine with a balancing device according to a preferred embodiment of the utility model.
[0022] Figure 4 It is a front view of an engine with a balancing device according to a preferred embodiment of the utility model.
[0023] Description of main component symbols:
[0024] 1, 91, 91' engine
[0025] 2 Power transmission unit
[0026] 21,923 Linkage
[0027] 22, 921, 921' crankshaft
[0028] 23 First transmission element
[0029] 3, 93, 93'First balancing device
[0030] 31, 931' First balance shaft
[0031] 32, 932' Second transmission element
[0032] 4, 94' Second balancing device
[0033] 41, 941' Second balance shaft
[0034] 42, 942' Third transmission element
[0035] 5 Crankcase assembly
[0036] 50 Crankcase storage space
[0037] 501 Crankshaft Chamber
[0038] 501a Buffer
[0039] 502 oil chamber
[0040] 51 Main bulkhead
[0041] 52 Exit
[0042] 53 One-way device
[0043] 54 Oil pan
[0044] 55 Scraper
[0045] 56 Guide Plate
[0046] 57 Right crankcase
[0047] 58 Left crankcase
[0048] 59 cylinder
[0049] 6, 96' Lubricating oil
[0050] C1 crankshaft center
[0051] C2 first balance shaft center
[0052] C3 Second Balance Shaft Center
[0053] L1 center axis
[0054] L2 Connection
[0055] P Split plane
[0056] V Through Hole
[0057] W wall
[0058] Z direction DETAILED DESCRIPTION
[0059] See also Figure 3 , which is a cross-sectional view of an engine with a balancing device according to a preferred embodiment of the utility model. The figure shows an engine 1 with a balancing device, including a power transmission unit 2, a first balancing device 3, a second balancing device 4 and a crankcase assembly 5. In this embodiment, the engine 1 is a single-cylinder engine, in particular, a fixed engine locked to the vehicle body. The power transmission unit 2 includes a connecting rod mechanism 21, a crankshaft 22, a first transmission element 23 arranged on the crankshaft 22 and a piston (not shown). The piston of the engine 1 is connected to the crankshaft 22 through the connecting rod mechanism 21 to convert the reciprocating linear motion of the engine 1 into rotational motion.
[0060] The first balancing device 3 is located below the crankshaft 22 and close to the front of the engine 1, thereby making the appearance design of the engine 1 more compact). The first balancing device 3 includes a first balancing shaft 31 and a second transmission element 32 arranged on the first balancing shaft 31. The first transmission element 23 drives the second transmission element 32 to operate, and the first balancing shaft 31 receives power from the crankshaft 22 through the second transmission element 32 arranged at the shaft end, so that the rotation speed of the first balancing shaft 31 is the same as that of the crankshaft 22 but in the opposite direction. In other words, the rotation direction of the first balancing device 3 is clockwise, thereby cooperating with the movement of the crankshaft 22 to offset the unbalanced force of the engine 1.
[0061] The second balancing device 4 is located above the crankshaft 22 and close to the rear of the engine 1, thereby making the appearance design of the engine 1 more compact, and the second balancing device 4 includes a second balancing shaft 41 and a third transmission element 42 arranged on the second balancing shaft 41, the first transmission element 23 drives the third transmission element 42 to operate, and the second balancing shaft 41 receives the power from the crankshaft 22 through the third transmission element 42 arranged at the shaft end, so that the rotation speed of the second balancing shaft 41 is the same as that of the crankshaft 22 and the direction is opposite, that is, the rotation direction of the second balancing device 4 is clockwise (that is, the same as the rotation direction of the first balancing device 3), thereby cooperating with the movement of the crankshaft 22 to greatly offset the unbalanced force and unbalanced torque of the engine 1. In this embodiment, the connecting line L2 of the first balancing shaft center C2 of the first balancing shaft 31 and the second balancing shaft center C3 of the second balancing shaft 41 can pass through a crankshaft center C1 of the crankshaft 22, thereby combining the relative position relationship of the first balancing device 3 and the second balancing device 4, the appearance design of the engine 1 will be more compact.
[0062] The crankcase assembly 5 is provided with a crankcase accommodating space 50, and a wall surface W of the crankcase assembly 5 is provided with a main partition plate 51, a scraper plate 55 and a guide plate 56, and a plurality of through holes V are opened. The crankcase accommodating space 50 is separated into a crankshaft chamber 501 and an oil chamber 502 by the main partition plate 51 which roughly envelops the movement trajectory of the crankshaft 22, the first balance shaft 31 and the second balance shaft 41, and an oil pan 54 is provided at the bottom of the oil chamber 502, thereby separating the crankshaft 22, the first balance device 3 and the second balance device 4 from the lubricating oil 6 of the oil pan 54, forming an independent crankshaft chamber 501 and oil chamber 502. The crank chamber 501 is connected to the engine oil chamber 502 via a discharge port 52. The discharge port 52 is provided with a one-way device 53, so that the lubricating oil 6 in the crank chamber 501 flows to the engine oil chamber 502 alone, and then the lubricating oil 6 is accumulated in the oil pan 54, thereby isolating the lubricating oil 6 in the oil pan 54, and preventing the crankshaft 22 or the first balance shaft 31 from stirring the liquid level of the lubricating oil 6 and causing power loss. In this embodiment, the crank chamber 501 also includes a buffer portion 501a, which is located between the first balance device 3 and the discharge port 52, and is roughly surrounded by the scraper 55, the guide plate 56, and the discharge port 52, and is used to accommodate part of the lubricating oil 6 flowing down from the crank chamber 501. The scraper 55 and the guide plate 56 are both located between the first balancing device 3 and the buffer portion 501a, wherein the scraper 55 is used to help scrape off the lubricating oil 6 attached to the first balancing device 3, and the guide plate 56 is used to guide the lubricating oil 6 in the crank chamber 501 to flow to the buffer portion 501a. The through hole V is located in the engine oil chamber 502, and is used to balance the internal pressure in the engine oil chamber 502, so that the lubricating oil 6 can flow back smoothly and circulate with the engine oil chamber 502, so that the liquid level of the lubricating oil 6 is balanced, and excessive disturbance of the lubricating oil 6 in the engine oil chamber 502 is prevented. In this embodiment, the number of through holes V is three, but the utility model is not limited thereto, and can be adjusted according to the actual need to remove air.
[0063] Please also read Figure 4 , which is a front view of an engine with a balancing device according to a preferred embodiment of the utility model (by Figure 3 As shown in the figure, the crankcase assembly 5 includes a right crankcase 57 and a left crankcase 58, which are divided by a dividing plane P. The crankcase assembly 5 is provided with a cylindrical portion 59, which is composed of the right crankcase 57 and the left crankcase 58. In the front view, the central axis L1 of the cylindrical portion 59 is not located in the same plane as the dividing plane P, so that the one-way device 53 is roughly centered in the front view, and one side of the one-way device 53 is adjacent to the dividing plane P of the crankcase assembly 5.
[0064] Through the above design, the advantage of the utility model is that it can reduce the disturbance of lubricating oil caused by the rotation of components inside the engine, so as to prevent excessive disturbance of the lubricating oil and thus cause power loss. Furthermore, while largely offsetting the unbalanced force and unbalanced torque of the engine through the balancing device, it can also maintain the power output of the engine, providing users with better power commerciality.
[0065] The above embodiments are merely examples for the convenience of explanation. The scope of rights claimed by the present utility model shall be based on the scope of protection required by the patent application documents, and is not limited to the above embodiments.
Claims
1. An engine with a balancing device, characterized in that: Included are: A power transmission unit includes a connecting rod mechanism, a crankshaft and a first transmission element disposed on the crankshaft; A first balancing device, comprising a first balancing shaft and a second transmission element disposed on the first balancing shaft, wherein the first transmission element drives the second transmission element to operate; a second balancing device, comprising a second balancing shaft and a third transmission element disposed on the second balancing shaft, wherein the first transmission element drives the third transmission element to operate; and A crankcase assembly is provided with a crankcase accommodating space. A main partition is provided on the wall of the crankcase assembly. The crankcase accommodating space is separated into a crankshaft chamber and an oil chamber by the main partition. The crankshaft chamber is connected to the oil chamber through a discharge port. The discharge port is provided with a one-way device so that the lubricating oil in the crankshaft chamber flows only to the oil chamber.
2. The engine with a balancing device as claimed in claim 1, characterized in that: The crank chamber further includes a buffer portion located between the first balancing device and the exhaust port.
3. The engine with a balancing device as claimed in claim 2, characterized in that: The wall surface of the crankcase assembly is also provided with a scraper and a guide plate, both of which are located between the first balancing device and the buffer portion.
4. The engine with a balancing device as claimed in claim 1, characterized in that: The wall surface of the crankcase assembly is also provided with a through hole, which is located in the engine oil chamber.
5. The engine with a balancing device as claimed in claim 1, characterized in that: The first balancing device is located below the crankshaft and closer to the front of the engine, and the second balancing device is located above the crankshaft and closer to the rear of the engine.
6. The engine with a balancing device as claimed in claim 1, characterized in that: A line connecting a first balancing shaft center of the first balancing shaft and a second balancing shaft center of the second balancing shaft passes through a crankshaft center of the crankshaft.
7. The engine with a balancing device as claimed in claim 1, characterized in that: The main partition plate roughly envelops the movement tracks of the crankshaft, the first balance shaft and the second balance shaft.
8. The engine with a balancing device as claimed in claim 1, characterized in that: The first balancing device rotates in a clockwise direction.
9. The engine with a balancing device as claimed in claim 1, characterized in that: The crankcase assembly includes a left crankcase and a right crankcase, which are divided by a dividing surface. The crankcase assembly is provided with a cylindrical portion, which is composed of the left crankcase and the right crankcase. When viewed from the front, the central axis of the cylindrical portion is not located in the same plane as the dividing surface.
10. The engine with a balancing device as claimed in claim 9, characterized in that: One side of the one-way device is adjacent to the dividing surface.