Rear-mounted engine air pump system based on chain wheel transmission

Abstract

The utility model discloses a rear-mounted engine air pump system based on chain wheel transmission, which comprises a rear-mounted air pump, an air pump chain wheel and a crankshaft chain wheel, the rear-mounted air pump is mounted at the rear end of an engine, the rear-mounted air pump is connected with an air pump chain wheel crankshaft, and an engine crankshaft is connected with the crankshaft chain wheel and used for directly driving the crankshaft chain wheel to axially rotate. A roller chain is installed between the air pump chain wheel and the crankshaft chain wheel, the roller chain is matched with the air pump chain wheel and the crankshaft chain wheel through teeth, and a tensioning guide rail and a tensioning adjuster which are used for guiding and adjusting the tensioning degree of the roller chain are further installed between the air pump chain wheel and the crankshaft chain wheel. A chain wheel is used for replacing a gear and a belt wheel in the prior art, and under optimization of three technical means of space reconstruction, transmission innovation and automatic adjustment, the control bottleneck of NVH (noise, vibration and sound vibration roughness of a traditional air pump) is broken through.

Description

Technical Field

[0001] The utility model relates to the technical field of engine air pumps, in particular to a rear-mounted engine air pump system based on sprocket drive. Background Art

[0002] Most existing engines use a front-mounted air pump. The front-end gear train of the engine is directly connected to the crankshaft, which transmits torsional vibration unevenly and easily impacts the gear meshing, causing belt vibration. The use of rigid meshing gear transmission will transmit vibration, and the use of pulley transmission will produce tension fluctuations at different crankshaft speeds, thereby producing abnormal noise.

[0003] Since the air pump is installed on the front panel of the cockpit, the noise generated by the gear transmission or pulley transmission will reach the cockpit directly, causing discomfort to the driver. At the same time, installing the air pump at the front end of the engine will lead to too many accessories at the front end of the engine, insufficient wrap angle of the front end gear system of the engine, belt slippage and whistling, and further increase the noise of the running transmission. Utility Model Content

[0004] In order to solve the problems mentioned in the above background technology, the present invention provides a rear-mounted engine air pump system based on sprocket drive.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A rear-mounted engine air pump system based on sprocket drive includes a rear-mounted air pump, an air pump sprocket, and a crankshaft sprocket. The rear-mounted air pump is installed at the rear end of the engine. The rear-mounted air pump is connected to the air pump sprocket crankshaft, and the engine crankshaft is connected to the crankshaft sprocket to directly drive the crankshaft sprocket to rotate axially:

[0007] A roller chain is installed between the air pump sprocket and the crankshaft sprocket. The roller chain cooperates with the air pump sprocket and the crankshaft sprocket teeth. A tensioning guide rail and a tensioning adjuster for guiding and adjusting the tension of the roller chain are also installed between the air pump sprocket and the crankshaft sprocket.

[0008] Preferably, a curved guide groove is formed on the side of the tensioning plate of the tensioning adjuster facing the crankshaft sprocket, and the roller chain can run close to the tensioning plate and be limited by the side wall of the curved guide groove so as not to separate from the tensioning plate during running.

[0009] Preferably, a positioning through hole is provided at the left or right end of the tensioning plate, and a positioning screw can pass through the positioning through hole and be installed on the engine rear plate, so that the conveying tensioning plate can rotate axially around the positioning screw while being installed in a limited position.

[0010] Preferably, a fixing cylinder is fixedly mounted on a side of the tensioning plate away from the roller chain, and an upwardly extending setting channel is provided inside the fixing cylinder so that the connecting spring and the hydraulic top plug are set in the setting channel.

[0011] Preferably, a connecting channel connecting the setting channel and the engine oil pump is provided at the bottom of the fixed cylinder. When the pressure of the engine oil pump increases, the pressure is transmitted to the setting channel through the connecting channel, so that the hydraulic top plug overcomes the rebound tension of the connecting spring and moves toward the tensioning plate.

[0012] Preferably, a barb block is provided near the upper end of the channel, and the latch can be inserted into the bend of the barb block, so that the latch can be removably installed above the hydraulic top plug to prevent the hydraulic top plug from moving upward.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] The utility model reconstructs the space through the rear-end arrangement of the air pump, and uses a sprocket to replace the gears and pulleys in the existing technology. At the same time, the tension adjuster can adaptively adjust the tension according to the engine speed. With the optimization of the triple technical means of space reconstruction, transmission innovation and automatic adjustment, it breaks through the control bottleneck of NVH (noise, vibration and harshness of traditional air pumps). Actual experiments have proved that in the common operating range of 2500-4000rpm, the noise in the cab of the utility model is reduced by 4-7dB, reaching the industry-leading level. It is particularly suitable for scenarios with strict NVH requirements such as new energy range extenders and hybrid engines. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 This is a schematic structural diagram of a rear-mounted engine air pump system based on sprocket drive according to the present invention;

[0017] Figure 2 This is a schematic structural diagram of the tensioning adjuster described in the utility model;

[0018] Figure 3 This is a structural schematic diagram of the tensioning adjuster of the present invention at one viewing angle;

[0019] Figure 4 This is a schematic diagram of the side sectional structure of the fixing cylinder before the tensioning plate is installed according to the present invention.

[0020] In the figure: 1. Rear air pump; 2. Air pump sprocket; 3. Crankshaft sprocket; 4. Roller chain; 5. Tensioning guide rail; 6. Tensioning adjuster; 601. Bending guide groove; 602. Positioning perforation; 603. Setting channel; 604. Connecting channel; 61. Tensioning plate; 62. Fixing cylinder; 63. Connecting spring; 64. Hydraulic ejector; 65. Barb block; 700. Latch. DETAILED DESCRIPTION

[0021] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example 1

[0022] Reference Figure 1-4 A rear-mounted engine air pump system based on sprocket drive includes a rear-mounted air pump 1 installed at the rear end of the engine, the rear-mounted air pump 1 is crankconnected to the air pump sprocket 2, the engine crankshaft is connected to the crankshaft sprocket 3, and is used to directly drive the crankshaft sprocket 3 to rotate axially, and a roller chain 4 is installed between the air pump sprocket 2 and the crankshaft sprocket 3.

[0023] The crankshaft sprocket 3 is provided with a limiting groove on the outer periphery, and the roller chain 4 is arranged in the limiting groove and cooperates with the teeth provided in the limiting groove. When the crankshaft sprocket 3 is driven by the engine crankshaft to rotate axially, the roller chain 4 can be linked to rotate, so that the roller chain 4 that cooperates with the teeth provided on the outer periphery of the air pump sprocket 2 can drive the air pump sprocket 2 to rotate axially. The roller chain 4 replaces the gears and or pulleys used as transmission devices in the prior art. The roller chain 4 has the structural rigidity of the gears and the overall flexibility of the pulleys. During transmission, it will not emit noise caused by rigid collision of gears, nor will it emit abnormal noise caused by friction of the pulleys.

[0024] A tensioning guide rail 5 and a tensioning adjuster 6 for guiding and adjusting the tension of the roller chain 4 are also installed between the air pump sprocket 2 and the crankshaft sprocket 3. The roller chain 4 is arranged between the tensioning guide rail 5 and the tensioning adjuster 6, and the roller chain 4 is tightly attached to the surfaces of the tensioning guide rail 5 and the tensioning adjuster 6 having guide grooves, respectively, so that the tensioning guide rail 5 and the tensioning adjuster 6 can limit and adjust the part of the roller chain 4 that is horizontally mounted between the air pump sprocket 2 and the crankshaft sprocket 3. The tensioning guide rail 5 is fixed, and the tensioning adjuster 6 can adaptively push the roller chain 4 toward the tensioning guide rail 5 after the engine crankshaft speed increases, thereby increasing the tension of the roller chain 4 and preventing the roller chain 4 that rotates at high speed with the crankshaft sprocket 3 from rotating away from the air pump sprocket 2 or the crankshaft sprocket 3. Example 2

[0025] Reference Figure 1-4 The difference between this embodiment and embodiment 1 is that the tensioning adjuster 6 includes a tensioning plate 61, which pushes the roller chain 4 toward the tensioning guide rail 5, thereby increasing the tension of the roller chain 4. The tensioning plate 61 forms a curved guide groove 601 on the side facing the crankshaft sprocket 3, and the roller chain 4 can move closely against the tensioning plate 61 and be limited by the side wall of the curved guide groove 601, so that it will not separate from the tensioning plate 61 during movement. A positioning through-hole 602 is provided at the left or right end of the tensioning plate 61. When setting the tensioning adjuster 6, the user can adjust the tensioning plate 61 to a suitable position, and then pass the positioning screw through the positioning through-hole 602 and install it on the engine rear plate, so that the tensioning plate 61 can rotate axially around the positioning screw while being limited and installed.

[0026] A fixed cylinder 62 is fixedly installed on the side of the tensioning plate 61 away from the roller chain 4. The fixed cylinder 62 has a setting channel 603 extending upward inside, so that the connecting spring 63 and the hydraulic top plug 64 are set in the setting channel 603. A connecting channel 604 connecting the setting channel 603 and the engine oil pump is provided at the bottom of the fixed cylinder 62. The engine oil pump is driven by the crankshaft. When the engine speed increases, the pumping oil volume increases. The oil pressure is proportional to the speed. When the oil pump pressure increases, the pressure will also be transmitted to the setting channel through the connecting channel 604. The hydraulic top plug 64 overcomes the rebound tension of the connecting spring 63 and moves toward the tensioning plate 61. The fixed cylinder 62 is installed on the side away from the positioning through-hole 602. The hydraulic top plug 64 moves toward the tensioning plate 61 to push the tensioning plate 61 further toward the roller chain 4, thereby maintaining the tensioning state of the roller chain 4. At the same time, when the tensioning plate 61 is lifted by the hydraulic top plug 64, it flips toward the roller chain 4, thereby making the wrap angle between the roller chain 4 and the air pump sprocket 2 and the crankshaft sprocket 3 smaller, making the transmission more stable.

[0027] Preferably, a barb block 65 is provided near the upper end of the setting channel 603. Before installing the tensioning plate 61, the user presses the hydraulic top plug 64 into the setting channel 603 and inserts the pin 700 into the bend of the barb block 65, so that the pin 700 can be removably installed above the hydraulic top plug 64 to hinder the hydraulic top plug 64 from moving upward, thereby providing more space for the adjustment and installation of the tensioning plate 61. After the roller chain 4 and the tensioning plate 61 are installed in the appropriate position, the user removes the pin 700, and the hydraulic top plug 64 can move upward to push the tensioning plate 61, so that the tensioning plate 61 tends to move toward the roller chain 4, so that the roller chain 4 remains in a tensioned state.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0029] In this utility model, unless otherwise expressly specified or limited, terms such as "disposed," "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; they may refer to mechanical connection, direct connection, or indirect connection through an intermediate medium; they may refer to internal communication between two elements or interaction between two elements. Those skilled in the art will be able to understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0030] The control method of the present invention is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by technicians in this field. The provision of power is also common knowledge in this field. In addition, the present invention is mainly used to protect mechanical devices, so the control method and circuit connection are no longer explained in detail in the present invention.

[0031] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A rear-mounted engine air pump system based on sprocket drive, comprising a rear-mounted air pump (1), an air pump sprocket (2) and a crankshaft sprocket (3), characterized in that: The rear air pump (1) is installed at the rear end of the engine. The rear air pump (1) is connected to the crankshaft of the air pump sprocket (2). The engine crankshaft is connected to the crankshaft sprocket (3) for directly driving the crankshaft sprocket (3) to rotate axially. A roller chain (4) is installed between the air pump sprocket (2) and the crankshaft sprocket (3), and the roller chain (4) cooperates with the teeth of the air pump sprocket (2) and the crankshaft sprocket (3). A tensioning guide rail (5) and a tensioning regulator (6) for guiding and adjusting the tension of the roller chain (4) are also installed between the air pump sprocket (2) and the crankshaft sprocket (3).

2. A rear-mounted engine air pump system based on sprocket drive according to claim 1, characterized in that: A curved guide groove (601) is formed on the side of the tensioning plate (61) of the tensioning adjuster (6) facing the crankshaft sprocket (3), and the roller chain (4) can run closely against the tensioning plate (61) and be limited by the side wall of the curved guide groove (601), thereby preventing the roller chain (4) from separating from the tensioning plate (61) during running.

3. The rear-mounted engine air pump system based on sprocket drive according to claim 2, characterized in that: A positioning through hole (602) is provided at the left or right end of the tensioning plate (61), and a positioning screw can pass through the positioning through hole (602) and be installed on the engine rear plate, so that the conveying tensioning plate (61) can rotate axially around the positioning screw while being installed in a limited position.

4. The rear-mounted engine air pump system based on sprocket drive according to claim 2, characterized in that: A fixing cylinder (62) is fixedly mounted on one side of the tensioning plate (61) away from the roller chain (4), and an upwardly extending setting channel (603) is provided inside the fixing cylinder (62), so that the connecting spring (63) and the hydraulic top plug (64) are set in the setting channel (603).

5. The rear-mounted engine air pump system based on sprocket drive according to claim 4, characterized in that: The bottom of the fixed cylinder (62) is provided with a connecting channel (604) communicating with the setting channel (603) and the engine oil pump. When the pressure of the engine oil pump increases, the pressure is transmitted to the setting channel (603) through the connecting channel (604), thereby causing the hydraulic top plug (64) to overcome the rebound tension of the connecting spring (63) and move toward the tensioning plate (61).

6. The rear-mounted engine air pump system based on sprocket drive according to claim 4, characterized in that: A barb block (65) is provided near the upper end of the setting channel (603), and the latch (700) can be inserted into the bend of the barb block (65), so that the latch (700) can be removably installed above the hydraulic top plug (64) to prevent the hydraulic top plug (64) from moving upward.

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