Balance shaft rotation measurement connection device based on the inherent structure of the engine housing

Abstract

The present invention provides a balancing shaft rotation measurement connection device based on the inherent structure of an engine housing, comprising a rotating shaft mechanism, a connecting shaft sleeve and a U-shaped bracket, wherein the rotating shaft mechanism is connected to the shaft hole of an engine oil pan through the connecting shaft sleeve, and one end extends to the inside of the engine oil pan to be connected to a balancing block fixing bolt fixed on the balancing shaft, and the other end extends to the outside of the engine oil pan to be connected to the rotating shaft of a balancing shaft rotation parameter measurement device; the U-shaped bracket is supported below the rotating shaft mechanism outside the engine oil pan, and a connecting portion matching the inherent connecting hole outside the engine oil pan is provided on the side of the U-shaped bracket close to the engine oil pan. The connection is achieved by designing a special U-shaped bracket structure based on the position of the inherent connecting hole on the engine oil pan, thereby reducing damage to the housing and the influence on the measurement result, and the design of the hole, shaft and surface takes the draft angle into consideration, thereby ensuring the accuracy of the output of the balancing shaft rotation parameter.

Description

Technical Field

[0001] The invention relates to the technical field of measuring devices, and in particular to a balance shaft rotation measuring connection device based on the inherent structure of an engine casing. Background Art

[0002] In the process of simulating and measuring the real rotation state of the engine balance shaft, a thin connecting shaft is usually introduced from the outside of the engine housing, connected to the center hole on one side of the balance shaft (or balance shaft gear, balance block), and the thin connecting shaft and even the entire measurement system are fixed with the help of the engine housing. Affected by the working vibration state of the engine, the various parts and connections between the entire measurement and clamping device should have appropriate strength and durability, and should not be worn or loose, so the number of parts and connections should not be too many. Since the actual size and structure of the engine will vary to a certain extent, the corresponding device should have a certain tolerance.

[0003] When designing a measuring and clamping fixture, it is important to consider the following three points:

[0004] 1. Before the test, the engine housing is usually required to be properly processed. Conventional thinking usually considers processing a certain number of shaft holes, bolt holes, or milling local planes on the engine housing. When the number of holes processed is large, it is possible to change the load-bearing method and path of the engine housing. Therefore, except for the engine housing surface and shell wall on the output side of the balance shaft, it is generally required that other areas of the engine housing are not allowed to be processed and damaged.

[0005] Second, since the crankshaft and balance shaft of the engine always vibrate when it is in operation, if there are parts or parts of the measuring and clamping fixtures located inside the engine housing, they may interfere with the balance block, balance shaft gear, etc. due to vibration during the test, or gradually enter the engine oil pan during the test and cause motion interference, thereby affecting the operation of the engine. Therefore, except for the thin connecting shaft, it should be avoided that there are measuring and clamping fixtures that are directly installed inside the engine or that may enter the engine.

[0006] 3. When designing a measuring and clamping device using the engine housing, it is necessary to consider a housing draft angle of at least 2°. Therefore, it is possible that the device support axis is not perpendicular to one side of the end face, which brings certain difficulties to the design. In particular, since the surface of the engine housing is a casting, the housing draft angle of 2° is not very accurate, so it is necessary to avoid directly using positioning that is attached to the surface of the engine housing.

[0007] In summary, it is difficult to design a good measuring and clamping device under the premise of minimizing damage to the engine housing, minimizing the risk of internal interference in the housing, and minimizing the use of inaccurate positioning. For thin connecting shafts, a good bracket structure is particularly important. Summary of the invention

[0008] 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 balance shaft rotation measurement connection device based on the inherent structure of the engine housing.

[0009] The technical solution adopted by the present invention to solve its technical problems is: a balancing shaft rotation measurement connecting device based on the inherent structure of the engine casing, the connecting device is arranged between the balancing shaft and the balancing shaft rotation parameter measuring device, and includes a rotating shaft mechanism and a rotating shaft supporting and fixing mechanism, the rotating shaft supporting and fixing mechanism includes a connecting shaft sleeve and a U-shaped bracket, the middle part of the rotating shaft mechanism is rotatably connected inside the connecting shaft sleeve, the connecting shaft sleeve is fixedly connected in the shaft hole of the engine oil pan, and one end of the rotating shaft mechanism 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; the U-shaped bracket is supported below the rotating shaft mechanism outside the engine oil pan, and the side of the U-shaped bracket close to the engine oil pan is provided with a connecting part matching the inherent connecting hole outside the engine oil pan.

[0010] Since the connection portion of the U-shaped bracket matches the inherent connection hole outside the engine oil pan, the position of the connection portion may be different according to the position of the inherent connection hole.

[0011] When the inherent connection hole is located on the engine oil pan above the U-shaped bracket, the upper end of the U-shaped bracket close to the engine oil pan is bent toward the inner side of the opening of the U-shaped bracket to form the connection part, and the plane where the connection part is located is parallel to the rotating axis of the rotating shaft mechanism.

[0012] When the inherent connecting hole is located on the left and / or right engine oil pan of the U-shaped bracket, the left and / or right side of the side wall of the U-shaped bracket close to the engine oil pan is bent toward the inner side of the opening of the U-shaped bracket to form the connecting portion, and the plane where the connecting portion is located is parallel to the rotating axis of the rotating shaft mechanism.

[0013] The engine oil pan is a casting, and the surface usually has a certain draft angle, so the connecting shaft sleeve, U-shaped bracket, etc. need to have a local appropriate inclination to facilitate assembly and fitting. Therefore, the side wall of the U-shaped bracket close to the engine oil pan has an inclination angle that is the same as the draft angle of the engine oil pan.

[0014] In order to avoid axial movement of the connecting shaft and ensure that the connecting shaft is coaxial with the balance shaft, the outer side of the connecting shaft sleeve is a step structure, the thin end of the step structure matches the shaft hole on the engine oil pan, and the side wall of the U-shaped bracket close to the engine oil pan is provided with a step hole, and the step structure matches the step hole; the angle between the step surface of the step hole and the engine oil pan is the same as the draft angle of the engine oil pan. The connecting shaft sleeve is stepped, and the connecting shaft is securely assembled, and there is no risk of parts gradually entering the oil pan during the test and causing motion interference, thereby affecting the operation of the engine.

[0015] Furthermore, in order to improve the stability of the connecting device, a support structure is provided at the bottom of the U-shaped bracket. The bottom of the U-shaped bracket can be supported by the ground or other hard objects, and the support structure is installed to reduce the vibration of the engine housing caused by torsional vibration.

[0016] Specifically, the rotating shaft mechanism includes a connecting shaft and a coupling, wherein the connecting shaft is rotatably connected in a connecting shaft sleeve, one end of which extends to the inside of an engine oil pan and is connected to a balancing block fixing bolt, and the other end of which is connected to a rotating shaft of a balancing shaft rotation parameter measuring device through a coupling. Through the indirect connection of the coupling, the radial runout of the connecting shaft, the coupling and the rotating shaft of the balancing shaft rotation parameter measuring device is ensured, so that the radial runout is within the allowable range of the balancing shaft rotation parameter measuring device.

[0017] 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.

[0018] The beneficial effects of the present invention are as follows: the present invention provides a balance shaft rotation measurement connection device based on the inherent structure of the engine housing, which is connected by designing a special U-shaped bracket structure with the help of the position of the inherent bolt hole on the engine oil pan. Except for the connecting shaft hole, no bolt hole, other shaft hole processing, or any local plane milling will be generated on the engine oil pan due to the measurement test. Except for the assembly relationship between the connecting shaft sleeve and the engine oil pan, other assembly positioning relationships are directly related to the U-shaped bracket, and the processing of the U-shaped bracket is also relatively conventional, which greatly simplifies the processing complexity and difficulty of other parts. Except for the connecting shaft and its sleeve, there are no parts or parts located inside the engine housing; and the connecting shaft sleeve is stepped, and its step surface has a positioning relationship with the U-shaped bracket, which will not cause the sleeve to gradually screw into the engine during the test and then cause interference. The special structural design of the U-shaped bracket makes it unnecessary for the entire measurement and clamping device to be positioned and fixed on the surface of the engine housing, and it is unnecessary to use the inaccurate reference value of the housing draft angle of about 2° for precision control. In order to reduce the vibration of the engine housing caused by torsional vibration, a support structure can be installed under the U-shaped bracket by relying on the ground or other hard objects. This special U-shaped bracket has good overall strength and rigidity, is not easy to deform, and has strong designability. It can be appropriately optimized and adjusted according to the position of the bolt holes on the engine housing and the position of possible interfering objects (such as belts, pulleys, etc.). BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0020] Figure 1 It is a three-dimensional structural schematic diagram of the connecting device of the present invention.

[0021] Figure 2 It is a partial cross-sectional structural schematic diagram of the connecting device of the present invention.

[0022] Figure 3 It is a schematic diagram of the mechanism of the U-shaped bracket of the present invention.

[0023] In the figure: 1-balancing block fixing bolt, 2-balancing block, 3-connecting shaft, 4-connecting shaft sleeve, 5-engine oil pan, 6-oil seal, 7-connecting bolt, 8-U-shaped bracket, 81-bottom plate, 82-left side plate, 83-right side plate, 84-connecting part, 85-step hole, 86-step surface, 9-coupling, 10-encoder shaft, 11-inherent connecting hole, 12-encoder, 13-support structure. DETAILED DESCRIPTION

[0024] 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.

[0025] like Figure 1 and Figure 2 As shown, a balancing shaft rotation measurement connection device based on the inherent structure of the engine casing of the present invention is arranged between the balancing shaft and the balancing shaft rotation parameter measuring device, wherein a balancing shaft gear is installed on the outside of the balancing shaft, and the two are connected by a key, and a balancing block 2 is arranged at the end of the balancing shaft, and the balancing block 2 is fixed to the balancing shaft outside the balancing shaft gear by a balancing block fixing bolt 1; the balancing shaft rotation parameter measuring device can adopt a device that can measure the rotational speed, angular velocity, and angular acceleration. In this embodiment, an encoder 12 is taken as an example, and the encoder 12 is connected to a computer signal processing system. In order to directly output the rotation parameters of the balancing shaft to the outside of the engine oil pan 5 (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 balancing block fixing bolt 1 for connecting with external components, and the inherent connection holes 11 on the outside of the engine oil pan 5, such as threaded holes, bolt holes, through holes, etc., are used as the basis for connecting and fixing with the external mechanism to reduce damage to the shell; the engine oil pan 5 is a casting, and the surface usually has a certain draft angle, so the connecting shaft sleeve 4, U-shaped bracket 8, etc. need to have a local appropriate tilt for easy assembly and fitting. In this embodiment, the draft angle is 2° for illustration.

[0026] The connecting device of this embodiment includes a connecting shaft 3, a connecting shaft sleeve 4, a coupling 9, a U-shaped bracket 8 and a supporting structure 13, wherein the connecting shaft 3 and the coupling 9 together constitute a rotating shaft mechanism, and the connecting shaft sleeve 4, the U-shaped bracket 8 and the supporting structure 13 together constitute a rotating shaft supporting and fixing mechanism.

[0027] The connecting shaft 3 is rotatably connected inside the connecting shaft sleeve 4, and an oil seal 6 is provided between the connecting shaft 3 and the inner wall of the connecting shaft sleeve 4; the connecting shaft sleeve 4 is fixedly connected to the shaft hole of the engine oil pan 5, and one end of the connecting shaft 3 extends to the inside of the engine oil pan 5 and is connected to the threaded hole on the balancing block fixing bolt 1. The thread rotation direction of the threaded hole makes the locking direction of the connecting shaft 3 and the threaded hole opposite to the rotation direction of the balancing shaft; the other end of the connecting shaft 3 extends to the outside of the engine oil pan 5 and is connected to the encoder shaft 10 through the coupling 9. Through the special threaded connection method of the balancing block fixing bolt 1 and the connecting shaft 3, the connecting shaft 3 and the balancing block 2 on the balancing shaft are tightly connected and rotate synchronously, and are not easy to loosen; 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.

[0028] like Figure 2 and Figure 3 As shown, in this embodiment, the inherent connection hole 11 on the upper part of the engine oil pan 5 is used for connection. Therefore, the U-shaped bracket 8 includes a bottom plate 81, a left side plate 82, a right side plate 83 and a connecting portion 84 that are integrally connected. The left side plate 82 and the right side plate 83 are respectively arranged on the left and right sides of the bottom plate 81. The connecting portion 84 is a horizontal section arranged on the top of the left side plate 82, and is bent toward the opening side of the U-shaped bracket 8. As a preferred embodiment, the connecting portion 84 is parallel to the bottom plate 81; the upper and lower surfaces of the section are milled with precision, and are positioned by means of the bolt holes on the engine oil pan 5. In this embodiment, only two connecting bolts 7 are needed to fix the U-shaped bracket 8, wherein the connecting portion 84, in addition to having a connecting function, can also be used as a gasket for the connecting bolts 7. The outer surface of the left side plate 82 is closely assembled with the engine oil pan 5, so it can be parallel to the surface of the engine oil pan 5, directly along the vertical direction, or in other forms that do not interfere with the engine oil pan 5; preferably, the left side plate 82 is parallel to the engine oil pan 5 and has the same inclination angle as the draft angle of the engine oil pan 5. The middle part of the left side plate 82 is provided with a stepped hole 85 for installing the connecting shaft sleeve 4. The stepped surface 86 of the stepped hole 85 is perpendicular to the rotation axis of the balance shaft, and can achieve a positioning relationship with the stepped surface of the connecting shaft sleeve 4. The right side plate 83 is provided with a through hole that has a positioning and assembly relationship with the encoder 12.

[0029] The support structure 13 is supported under the bottom plate 81 of the U-shaped bracket 8. The bottom of the U-shaped bracket 8 can rely on the ground or other hard objects to install the support structure 13 to reduce the vibration of the engine housing caused by torsional vibration. In this embodiment, the support structure 13 adopts four tapered columns.

[0030] In this embodiment, the outer side of the connecting shaft sleeve 4 is a step structure, and the thin end of the step structure matches the axial hole on the engine oil pan 5. The step structure cooperates with the step hole 85 to prevent the connecting shaft sleeve 4 from moving into the shell; the angle between the step surface 86 of the step hole 85 and the engine oil pan 5 is the same as the draft angle of the engine oil pan 5.

[0031] The connecting device of this embodiment, except for processing the connecting shaft hole on the engine oil pan 5, does not produce any bolt holes, other shaft hole processing, or any local plane milling on the engine housing, which will not significantly change the load-bearing mode and path of the engine housing; except for the connecting shaft 3 and its sleeve, there are no parts or parts directly installed inside the engine housing, and there is no risk of interference with the balance block 2, balance shaft gear, etc. due to vibration during the test, thereby affecting the operation of the engine; except for the assembly relationship between the connecting shaft sleeve 4 and the engine oil pan 5, other assembly positioning relationships are directly related to the U-shaped bracket 8, and the processing of the U-shaped bracket 8 is also relatively conventional, which greatly simplifies the processing complexity and difficulty of other parts; the design of the U-shaped bracket 8 can reduce the number of overall parts and connections.

[0032] 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 balance shaft rotation measurement connection device based on the inherent structure of the engine housing, characterized in that: The connecting device is arranged between the balancing shaft and the balancing shaft rotation parameter measuring device, and includes a rotating shaft mechanism and a rotating shaft supporting and fixing mechanism. The rotating shaft supporting and fixing mechanism includes a connecting shaft sleeve and a U-shaped bracket. The middle part of the rotating shaft mechanism is rotatably connected inside the connecting shaft sleeve. The connecting shaft sleeve is fixedly connected in the shaft hole of the engine oil pan, and one end of the rotating shaft mechanism 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; the U-shaped bracket is supported below the rotating shaft mechanism outside the engine oil pan, and the U-shaped bracket is provided with a connecting part matching the inherent connecting hole outside the engine oil pan on one side close to the engine oil pan.

2. The balance shaft rotation measurement connection device based on the inherent structure of the engine housing according to claim 1, characterized in that: The inherent connection hole is located on the engine oil pan above the U-shaped bracket, and the upper end of the U-shaped bracket close to the engine oil pan is bent toward the inner side of the opening of the U-shaped bracket to form the connection part, and the plane where the connection part is located is parallel to the rotating axis of the rotating shaft mechanism.

3. The balance shaft rotation measurement connection device based on the inherent structure of the engine housing according to claim 1, characterized in that: The inherent connection hole is located on the left and / or right engine oil pan of the U-shaped bracket, and the left and / or right side walls of the U-shaped bracket close to the engine oil pan are bent toward the inner side of the opening of the U-shaped bracket to form the connection portion, and the plane where the connection portion is located is parallel to the rotating axis of the rotating shaft mechanism.

4. The balance shaft rotation measurement connection device based on the inherent structure of the engine housing according to claim 1, characterized in that: The side wall of the U-shaped bracket close to the engine oil pan has an inclination angle that is the same as the draft angle of the engine oil pan.

5. The balance shaft rotation measurement connection device based on the inherent structure of the engine housing according to claim 4, characterized in that: The outer side of the connecting shaft sleeve is a step structure, and the thin end of the step structure matches the axial hole on the engine oil pan. A step hole is provided on the side wall of the U-shaped bracket close to the engine oil pan, and the step structure matches the step hole; the angle between the step surface of the step hole and the engine oil pan is the same as the draft angle of the engine oil pan.

6. The balance shaft rotation measurement connection device based on the inherent structure of the engine housing according to any one of claims 1 to 5, characterized in that: A supporting structure is provided at the bottom of the U-shaped bracket.

7. The balance shaft rotation measurement connection device based on the inherent structure of the engine housing according to claim 6, characterized in that: The rotating shaft mechanism includes a connecting shaft and a coupling. The connecting shaft is rotatably connected in a connecting shaft sleeve, one end of which extends to the inside of the engine oil pan and is connected to the balancing block fixing bolt, and the other end is connected to the rotating shaft of the balancing shaft rotation parameter measuring device through a coupling.

8. The balance shaft rotation measurement connection device based on the inherent structure of the engine housing according to claim 7, 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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