Robust engine balance shaft rotation measurement connection

Abstract

The present invention provides a stable engine balance shaft rotation measurement connection device, including a connection shaft, a connection shaft fixing mechanism and a coupling, wherein the connection shaft is connected to the engine oil pan through the connection shaft fixing mechanism, and one end of the connection shaft extends to the inside of the engine oil pan to be connected to the balance block fixing bolt fixed on the balance shaft, and the other end extends to the outside of the engine oil pan to be connected to the rotating shaft of the balance shaft rotation parameter measuring device through the coupling; the radial runout of the balance block fixing bolt, the connection shaft, the coupling and the rotating shaft of the balance shaft rotation parameter measuring device is within the allowable range of the balance shaft rotation parameter measuring device, and the balance block fixing bolt, the connection shaft, the coupling and the balance shaft rotation parameter measuring device are coaxially connected in sequence. Through the reasonable design of the connection shaft sleeve and the U-shaped bracket, the coaxiality of each assembly hole and the shaft, as well as the radial runout of the rotating shaft, are guaranteed on the basis of considering the draft angle of the engine oil pan.

Description

Technical Field

[0001] The invention relates to the technical field of measuring devices, and in particular to a stable engine balance shaft rotation measuring connection device. Background Art

[0002] The balance shaft can be used to reduce the vibration of the engine caused by the reciprocating motion of the piston in the working cycle, thereby improving driving comfort. In order to comprehensively evaluate the actual effect of the balance shaft, it is necessary to simulate its actual rotation state and perform corresponding measurements. Usually, a thin connecting shaft is introduced from the outside of the engine oil pan and tightly connected to the balance block or balance shaft gear on the balance shaft. Since the overall structural design of the thin connecting shaft is light, its rigidity does not affect the actual motion state of the balance shaft, and the thin connecting shaft rotates synchronously with the balance shaft. Therefore, it is only necessary to extract the rotation parameters of the thin connecting shaft to evaluate the rotation state of the balance shaft. Considering the vibration of the balance shaft and the engine oil pan, it is necessary to design a reasonable connecting shaft fixing device and fix the measurement system with the help of the engine oil pan. This requires consideration of the following three points: First, the fixture needs to ensure the coaxiality of the assembly holes and the shaft (and sleeve), and the radial runout of the measuring device (such as the encoder) shaft should be within the measuring range of the measuring device; second, when fixing with the help of the engine oil pan, it is necessary to consider the shell draft angle of at least 2°, especially the fastening end face should be perpendicular to the force axis; third, the fixing of the measuring system should not affect the rotation of the balance shaft and the normal operation of the encoder, and the various components of the fixture and the connections between the components should have appropriate strength and durability. Therefore, the design of the fixture is somewhat complex, and there are few related systematic research and discussions. Summary of the invention

[0003] The technical problem to be solved by the present invention is: in order to overcome the deficiencies in the prior art, the present invention provides a stable engine balance shaft rotation measurement connection device.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a stable engine balancing shaft rotation measurement connecting device, the connecting device is arranged between the balancing shaft and the balancing shaft rotation parameter measuring device, and includes a connecting shaft, a connecting shaft fixing mechanism and a coupling. The connecting shaft is connected to the shaft hole of the engine oil pan through the connecting shaft fixing mechanism, and one end of the connecting shaft extends to the inside of the engine oil pan and is connected to the balancing block fixing bolt fixed on the balancing shaft, and the other end extends to the outside of the engine oil pan and is connected to the rotating shaft of the balancing shaft rotation parameter measuring device through a coupling; the radial runout of the rotating shaft of the balancing block fixing bolt, the connecting shaft, the coupling and the balancing shaft rotation parameter measuring device is within the allowable range of the balancing shaft rotation parameter measuring device, and the balancing block fixing bolt, the connecting shaft, the coupling and the balancing shaft rotation parameter measuring device are coaxially connected in sequence.

[0005] The connecting shaft, coupling, and the shaft of the balancing shaft rotation parameter measuring device have coaxiality requirements in all assembly holes and shafts along the balancing shaft rotation axis direction; the radial runout at various locations along the rotating shaft needs to be measured in sections, and its value should be within a given range, especially in the part of the connecting shaft close to the balancing block fixing bolt, the part of the connecting shaft close to the coupling, and the part of the shaft of the balancing shaft rotation parameter measuring device close to the coupling. Radial runout detection is required to ensure that the radial runout of the encoder shaft is within the measuring range of the balancing shaft rotation parameter measuring device, thereby ensuring that the entire connecting device can accurately output the rotation parameters of the balancing shaft.

[0006] Furthermore, in order to improve the stability of the connecting shaft and facilitate the connection with other components, the connecting shaft fixing mechanism includes a connecting shaft sleeve for connecting the connecting shaft to the engine oil pan and a U-shaped bracket for supporting the external connecting device of the engine oil pan, the connecting shaft sleeve includes a cylinder body and a clamping gasket arranged on the outside of the cylinder body, the connecting shaft is rotatably connected in the cylinder body, and the connecting shaft sleeve is arranged in the axial hole of the engine oil pan so that the clamping gasket is tightly attached to the engine oil pan; the U-shaped bracket is supported below the connecting device between the cylinder body on the outside of the engine oil pan and the balance shaft rotation parameter measuring device, and the end of the U-shaped bracket close to the engine oil pan and the engine oil pan clamps the clamping gasket between the U-shaped bracket and the engine oil pan.

[0007] The engine oil pan is a casting, and the surface usually has a certain draft angle. Therefore, the clamping gasket of the connecting shaft sleeve, the U-shaped bracket, etc. need to have a local appropriate tilt to facilitate assembly and fitting.

[0008] Furthermore, the side walls of the clamping gasket and the U-shaped bracket close to the engine oil pan have an inclination angle that is the same as the draft angle of the engine oil pan.

[0009] The connecting shaft sleeve can adopt a split combined structure or an integral one-piece structure. When the combined structure is adopted, the cylinder and the clamping gasket are separately arranged, and each component can be realized by conventional processing methods such as turning and milling. The outer side of the cylinder is a step structure, and a step hole is arranged in the middle of the clamping gasket. The step structure cooperates with the step hole to form an assembly relationship; the angle between the step surface of the step hole and the side of the clamping gasket that fits the engine oil pan is the same as the draft angle of the engine oil pan. When the integral structure is adopted, the cylinder and the clamping gasket are integrally arranged, and can be realized by a cylinder and a cuboid through grooving, welding, and milling in sequence. Compared with the integral connecting shaft sleeve, the stepped sleeve of the combined connecting shaft sleeve can make the opening on the engine oil pan smaller, and the processing damage to the shell is less, so the impact on the measurement result is also smaller. The inner holes of the stepped sleeve and the integral connecting shaft sleeve are coaxial with the connecting shaft, and the thin end outer cylindrical surface of the stepped sleeve and the outer cylindrical surface of the integral connecting shaft sleeve are assembled with the opening on the engine oil pan.

[0010] Furthermore, in order to achieve the fixation of the U-shaped bracket and the clamping of the connecting shaft sleeve, it also includes a bracket fixing bolt and a bracket fixing nut. The U-shaped bracket is connected to the engine oil pan through the bracket fixing bolt and the bracket fixing nut. The fastening end face of the bracket fixing bolt is perpendicular to the force axis, that is, the angle between the bolt axis and the balance shaft rotation axis is the same as the draft angle.

[0011] Furthermore, the inner diameter of the U-shaped bracket that matches the barrel of the connecting shaft sleeve is larger than the outer diameter of the barrel, so there is no matching relationship, which is convenient for disassembly.

[0012] Furthermore, the end face of the U-shaped bracket close to the balancing shaft rotation parameter measuring device is perpendicular to the rotating shaft of the balancing shaft rotation parameter measuring device, and an inner hole is provided on the end face for cooperating with the rotating shaft of the balancing shaft rotation parameter measuring device, and the rotating shaft and the inner hole are gap-matched.

[0013] Furthermore, the balancing block fixing bolt is provided with a threaded hole connected to the connecting shaft, and the threaded direction of the threaded hole makes the locking direction of the connecting shaft and the threaded hole opposite to the rotation direction of the balancing shaft. Through the special threaded connection between the balancing block fixing bolt and the connecting shaft, the connecting shaft and the balancing block on the balancing shaft are tightly connected and rotate synchronously, and are not prone to loosening; because the tightening direction of the thread is opposite to the rotation direction of the balancing shaft, the higher the rotation speed of the balancing shaft, the tighter the connection.

[0014] The beneficial effects of the present invention are as follows: the present invention provides a stable engine balance shaft rotation measurement connection device, which ensures the coaxiality of each assembly hole and the shaft (and sleeve) and the radial runout of the measuring device (encoder) shaft on the basis of considering the draft angle of the engine oil pan through a reasonable design of the connecting shaft sleeve and U-shaped bracket. The entire fixing device is connected to the surface of the engine oil pan by bolts, and its structure is light and will not affect the rotation of the balance shaft and the normal operation of the encoder; the various components of the fixing device are compactly connected, and each component and its connection have suitable strength and durability, and are not prone to damage, wear, and loosening during the test. The bolt connection is designed to prevent loosening, and its fastening end face is perpendicular to the force axis of the bolt, that is, the bolt axis and the balance shaft rotation axis have an angle equal to the draft angle. For the key core component-the connecting shaft sleeve, the present invention designs two forms: combined and integral, and both have good assembly accuracy and processing feasibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0016] Figure 1 It is a schematic structural diagram of the best embodiment of the present invention.

[0017] Figure 2 It is a schematic diagram of the assembly structure of the combined connecting shaft sleeve in the first embodiment.

[0018] Figure 3 It is a structural schematic diagram of a combined connecting shaft sleeve.

[0019] Figure 4 It is a schematic diagram of the assembly structure of the integrated connecting shaft sleeve in the second embodiment.

[0020] Figure 5 It is a structural schematic diagram of an integrated connecting shaft sleeve.

[0021] In the figure: 1-balance shaft gear, 2-balance block, 3-balance block fixing bolt, 4-connecting shaft, 5-connecting shaft sleeve, 51-cylinder, 52-clamping gasket, 6-bracket fixing bolt, 7-engine oil pan, 8-bracket fixing nut, 9-coupling, 10-U-shaped bracket, 11-rotating shaft of balance shaft rotation parameter measuring device, 12-balance shaft rotation parameter measuring device, 13-gasket, 14-oil seal. DETAILED DESCRIPTION

[0022] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner only, and therefore only show the components related to the present invention, and directions and references (e.g., up, down, left, right, etc.) may only be used to help describe the features in the drawings. Therefore, the following specific embodiments are not to be taken in a limiting sense, and the scope of the subject matter claimed is limited only by the attached claims and their equivalents.

[0023] Embodiment 1:

[0024] like Figure 1-Figure 3 As shown, a stable engine balance shaft rotation measurement connection device of the present invention is arranged between the balance shaft and the balance shaft rotation parameter measurement device 12, wherein a balance shaft gear 1 is installed outside the balance shaft, and the two are connected by a key, and a balance block 2 is arranged at the end of the balance shaft, and the balance block 2 is fixed to the balance shaft outside the balance shaft gear 1 by a balance block fixing bolt 3; the balance shaft rotation parameter measurement device 12 can adopt a device capable of measuring rotation speed, angular velocity, and angular acceleration, such as an encoder. In order to be able to directly output the rotation parameters of the balance shaft to the outside of the engine oil pan 7 (only part of the shell is shown in the figure), the original mechanism is directly used to directly open a threaded hole at the end of the balance block fixing bolt 3 for connection with external components; the engine oil pan 7 is a casting, and the surface usually has a certain draft angle, so the clamping gasket 52 of the connecting shaft sleeve 5, the U-shaped bracket 10, etc. need to have a local appropriate tilted place to facilitate assembly and fitting. In this embodiment, the draft angle is 2° for description.

[0025] In this embodiment, the connecting device includes a connecting shaft 4, a connecting shaft fixing mechanism and a coupling 9, wherein the connecting shaft 4 is connected to the axial hole of the engine oil pan 7 through the connecting shaft fixing mechanism, and one end of the connecting shaft 4 extends to the inside of the engine oil pan 7 and is connected to the balancing block fixing bolt 3 fixed on the balancing shaft, and the other end extends to the outside of the engine oil pan 7 and is connected to the rotating shaft 11 of the U-shaped balancing shaft rotation parameter measuring device 12 through the coupling 9; the radial runout of the balancing block fixing bolt 3, the connecting shaft 4, the coupling 9 and the rotating shaft 11 of the U-shaped balancing shaft rotation parameter measuring device 12 is within the allowable range of the balancing shaft rotation parameter measuring device 12, and the balancing block fixing bolt 3, the connecting shaft 4, the coupling 9 and the balancing shaft rotation parameter measuring device 12 are coaxially connected in sequence.

[0026] The connecting shaft 4, the coupling 9, and the rotating shaft 11 of the U-shaped balancing shaft rotation parameter measuring device 12 all have coaxiality requirements in the assembly holes and shafts along the balancing shaft rotation axis direction; the radial runout at various locations along the rotating shaft needs to be measured in sections, and its value should be within a given range, especially in the part of the connecting shaft 4 close to the balancing block fixing bolt 3, the part of the connecting shaft 4 close to the coupling 9, and the part of the rotating shaft of the balancing shaft rotation parameter measuring device 12 close to the coupling 9, all of which need to be tested for radial runout to ensure that the radial runout of the encoder shaft is within the measuring range of the balancing shaft rotation parameter measuring device 12, thereby ensuring that the entire connecting device can accurately output the rotation parameters of the balancing shaft.

[0027] like Figure 2 and Figure 3 As shown, the connecting shaft fixing mechanism includes a connecting shaft sleeve 5 for connecting the connecting shaft 4 with the engine oil pan 7 and a U-shaped bracket 10 for supporting the external connection device of the engine oil pan 7, wherein the connecting shaft sleeve 5 is a combined connecting shaft sleeve 5, including a cylinder body 51 and a clamping gasket 52 arranged on the outside of the cylinder body 51, the cylinder body 51 and the clamping gasket 52 are separately arranged, and each component can be realized by conventional processing methods such as turning and milling, the outer side of the cylinder body 51 is a step structure, and a step hole is arranged in the middle of the clamping gasket 52, the step structure cooperates with the step hole to form an assembly relationship; the angle between the step surface of the step hole and the side of the clamping gasket 52 that fits the engine oil pan 7 is 2°. The connecting shaft 4 is rotatably connected in the cylinder 51, and the connecting shaft sleeve 5 is arranged in the shaft hole of the engine oil pan 7 so that the clamping gasket 52 is closely attached to the engine oil pan 7; the U-shaped bracket 10 is supported below the connecting device between the cylinder 51 outside the engine oil pan 7 and the balance shaft rotation parameter measuring device 12, and the end of the U-shaped bracket 10 close to the engine oil pan 7 and the engine oil pan 7 clamp the clamping gasket 52 between the U-shaped bracket 10 and the engine oil pan 7. The inclination angle of the side wall of the clamping gasket 52 and the side of the U-shaped bracket 10 close to the engine oil pan 7 is 2°. The left and right surfaces of the clamping gasket 52 and the left and right surfaces of the clamping part of the integral connecting shaft sleeve 5 are parallel to the outer surface of the engine oil pan 7, that is, the angle with the balance shaft rotation axis is 88°. In addition to cooperating with the outer cylindrical surface of the thin end of the stepped sleeve, the clamping gasket 52 also has a flat groove (the flat groove is perpendicular to the rotation axis of the balance shaft) and cooperates with the step surface of the stepped sleeve (the step surface is perpendicular to the rotation axis of the balance shaft).

[0028] In order to fix the U-shaped bracket 10 and clamp the connecting shaft sleeve 5, it also includes a bracket fixing bolt 6 and a bracket fixing nut 8. The left surface of the U-shaped bracket 10 is parallel to the outer surface of the engine oil pan 7 and is connected to the surface of the engine oil pan 7 by four bolts. The fastening end face of the bracket fixing bolt 6 is perpendicular to the force axis, that is, the angle between the axis of the bracket fixing bolt 6 and the rotation axis of the balance shaft is 2°. The bracket fixing bolt 6 connection is designed to prevent loosening, the bracket fixing nut 8 is a loosening nut, and the gasket 13 is a spring gasket. The inner hole diameter of the U-shaped bracket 10 that matches the barrel 51 of the connecting shaft sleeve 5 is larger than the outer diameter of the barrel 51. There is no matching relationship, which is easy to disassemble, and only the inner hole needs to be larger than the outer cylindrical surface. The end face of the U-shaped bracket 10 on one side close to the balancing shaft rotation parameter measuring device 12 is perpendicular to the rotating shaft 11 of the U-shaped balancing shaft rotation parameter measuring device 12, and an inner hole is provided on the end face for matching with the rotating shaft 11 of the U-shaped balancing shaft rotation parameter measuring device 12, and the rotating shaft and the inner hole are in clearance. The U-shaped bracket 10 should also have the characteristic of not being easily deformed.

[0029] The balancing block fixing bolt 3 is provided with a threaded hole connected to the connecting shaft 4. The thread rotation direction of the threaded hole makes the locking direction of the connecting shaft 4 and the threaded hole opposite to the rotation direction of the balancing shaft. Through the special threaded connection between the balancing block fixing bolt 3 and the connecting shaft 4, the connecting shaft 4 and the balancing block 2 on the balancing shaft are tightly connected and rotate synchronously, and are not prone to loosening; because the thread tightening direction is opposite to the rotation direction of the balancing shaft, the higher the rotation speed of the balancing shaft, the tighter the connection. The surface of the connecting shaft 4 is provided with a groove structure, which cooperates with the oil seal 14 between the connecting shaft 4 and the cylinder 51. The groove structure on the surface of the connecting shaft 4, when cooperated with the oil seal 14, can better achieve sealing and oil isolation during rotation.

[0030] Embodiment 2:

[0031] like Figure 4 and Figure 5As shown, the difference between this embodiment and the first embodiment is that the structure of the connecting shaft sleeve 5 is different. In this embodiment, the connecting shaft sleeve 5 adopts an integral structure, including a hollow cylindrical barrel 51 and a clamping gasket 52 arranged on the outside of the barrel 51 for preventing axial movement. In this embodiment, the clamping gasket 52 is a rectangular thin plate integrally connected to the barrel 51, and the length of the upper edge of the thin plate is greater than the length of the lower edge. When the integral structure is adopted, the barrel 51 and the clamping gasket 52 are integrally arranged, which can be realized by a cylinder and a cuboid through grooving, welding, and milling in sequence. Compared with the integral connecting shaft sleeve 5, the stepped sleeve of the combined connecting shaft sleeve 5 can make the opening on the engine oil pan 7 smaller, and the processing damage to the shell is less, so the impact on the measurement result is also smaller. The inner hole of the stepped sleeve and the inner hole of the integral connecting shaft sleeve 5 are both coaxial with the connecting shaft 4 , and the thin end outer cylindrical surface of the stepped sleeve and the outer cylindrical surface of the integral connecting shaft sleeve 5 are assembled with the opening on the engine oil pan 7 .

[0032] During processing and assembly, the assembly holes and shafts of the connecting shaft 4, the coupling 9, and the encoder shaft along the rotation axis of the balancing shaft all meet the coaxiality requirements.

[0033] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the scope of the present invention through the above description. The technical scope of this invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A stable engine balance shaft rotation measurement connection device, characterized in that: The connecting device is arranged between the balancing shaft and the balancing shaft rotation parameter measuring device, and comprises a connecting shaft, a connecting shaft fixing mechanism and a coupling. The connecting shaft is connected to the shaft hole of the engine oil pan through the connecting shaft fixing mechanism, and one end of the connecting shaft extends to the inside of the engine oil pan and is connected to the balancing block fixing bolt fixed on the balancing shaft, and the other end extends to the outside of the engine oil pan and is connected to the rotating shaft of the balancing shaft rotation parameter measuring device through the coupling; the radial runout of the rotating shaft of the balancing block fixing bolt, the connecting shaft, the coupling and the balancing shaft rotation parameter measuring device is within the allowable range of the balancing shaft rotation parameter measuring device, and the balancing block fixing bolt, the connecting shaft, the coupling and the balancing shaft rotation parameter measuring device are coaxially connected in sequence; The connecting shaft fixing mechanism comprises a connecting shaft sleeve and a U-shaped bracket, wherein the connecting shaft sleeve comprises a cylinder body and a clamping gasket arranged on the outside of the cylinder body, wherein the connecting shaft is rotatably connected in the cylinder body, and the connecting shaft sleeve is arranged in the shaft hole of the engine oil pan so that the clamping gasket is closely attached to the engine oil pan; the U-shaped bracket is supported below the connecting device between the cylinder body on the outside of the engine oil pan and the balance shaft rotation parameter measuring device, and one end of the U-shaped bracket close to the engine oil pan and the engine oil pan clamp the clamping gasket between the U-shaped bracket and the engine oil pan; The side walls of the clamping gasket and the U-shaped bracket close to the engine oil pan have an inclination angle that is the same as the draft angle of the engine oil pan.

2. The stable engine balance shaft rotation measurement connection device according to claim 1, characterized in that: The cylinder and the clamping gasket are separately arranged, the outer side of the cylinder is a step structure, and a step hole is arranged in the middle of the clamping gasket, and the step structure cooperates with the step hole; the angle between the step surface of the step hole and the side surface of the clamping gasket that fits the engine oil pan is the same as the draft angle of the engine oil pan.

3. The stable engine balance shaft rotation measurement connection device according to claim 1, characterized in that: The cylinder body and the clamping gasket are integrally arranged.

4. The stable engine balance shaft rotation measurement connection device according to claim 1, characterized in that: It also includes a bracket fixing bolt and a bracket fixing nut. The U-shaped bracket is connected to the engine oil pan through the bracket fixing bolt and the bracket fixing nut. The fastening end surface of the bracket fixing bolt is perpendicular to the force axis.

5. The stable engine balance shaft rotation measurement connection device according to claim 1, characterized in that: The inner hole diameter of the U-shaped bracket that matches the cylinder of the connecting shaft sleeve is larger than the outer diameter of the cylinder.

6. The stable engine balance shaft rotation measurement connection device according to claim 1, characterized in that: The end face of the U-shaped bracket close to the balancing shaft rotation parameter measuring device is perpendicular to the rotating shaft of the balancing shaft rotation parameter measuring device, and an inner hole for cooperating with the rotating shaft of the balancing shaft rotation parameter measuring device is provided on the end face, and the rotating shaft and the inner hole are gap-matched.

7. The stable engine balance shaft rotation measurement connection device according to claim 1, characterized in that: The balancing block fixing bolt is provided with a threaded hole connected to the connecting shaft, and the thread rotation direction of the threaded hole makes the locking direction of the connecting shaft and the threaded hole opposite to the rotation direction of the balancing shaft.

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