Preassembling tool

Abstract

The preassembling tool comprises a shell, a rotating rod and a limiting mechanism, the shell is provided with a mounting hole penetrating through the shell, the mounting hole comprises a first hole section and a second hole section which are connected in the axial direction of the mounting hole, and the hole diameter of the second hole section is larger than that of the first hole section; the rotating rod is rotatably arranged in the mounting hole; the limiting mechanism is arranged on the shell, and the limiting mechanism limits movement of the rotating rod in the axial direction. Therefore, by arranging the limiting mechanism, on one hand, the rotating rod can be limited on the shell, so that the situation that the shell and the rotating rod are separated during assembling is prevented, assembling is facilitated, and the assembling efficiency can be improved; and on the other hand, the maximum moving distance of the rotating rod in the axial direction of the rotating rod can be limited, and then the position relation between the rotating rod and the piston cooling nozzle can be accurately controlled, so that the assembly precision is further improved.

Description

Technical Field

[0001] The present application relates to the technical field of engine parts assembly equipment, and in particular to a pre-assembly tool. Background Art

[0002] As the performance of the engine continues to improve, the heat load of the piston assembly gradually increases. In order to avoid the failure of the engine piston assembly due to high temperature, more and more automobile engines use piston cooling nozzles. The piston cooling nozzle has become a very important component in the engine assembly. The working principle of the piston cooling nozzle is that when driving at high speed or running under load for a long time, the piston is easily deformed due to high temperature, resulting in an increase in the gap between the piston and the cylinder liner, affecting the sealing of the engine. When the engine is running, the coolant is sprayed into the piston through the piston cooling nozzle to cool the surface of the piston to achieve the cooling effect, thereby improving the efficiency of the engine.

[0003] In the prior art, during the engine assembly process, the piston cooling nozzle is generally arranged on the main oil channel inside the crankcase. Due to the small space inside the crankcase, it is not easy to operate when assembling the piston cooling nozzle. It needs to be assembled manually in the small space inside the crankcase, which easily causes the piston cooling nozzle to fall or hurt the hand. Therefore, it is necessary to use tooling to assist the pre-assembly of the piston cooling nozzle. However, how to facilitate assembly and improve assembly accuracy has become an urgent problem to be solved. Utility Model Content

[0004] The purpose of the present application is to provide a pre-assembly tool to solve the technical problems of low assembly efficiency and poor assembly accuracy when using tooling to assist the pre-assembly of piston cooling nozzles in the prior art.

[0005] In order to achieve the above purpose, the technical solution adopted in this application is as follows:

[0006] A pre-installation tool comprises a shell, a rotating rod and a limiting mechanism, wherein the shell has a mounting hole passing through the shell, the mounting hole comprises a first hole segment and a second hole segment connected along its axial direction, the aperture of the second hole segment is larger than the aperture of the first hole segment; the rotating rod is rotatably arranged in the mounting hole; the limiting mechanism is arranged on the shell, and the limiting mechanism limits the movement of the rotating rod along its axial direction.

[0007] According to the above technical means, the piston cooling nozzle is limited by the second hole section so that the piston cooling nozzle can be installed in the housing, so that the rotating rod cooperates with the piston cooling nozzle to drive the piston cooling nozzle to rotate, which can improve the assembly accuracy. By setting a limiting mechanism, on the one hand, the rotating rod can be limited to the housing to prevent the housing and the rotating rod from being separated during assembly, so as to facilitate assembly and improve assembly efficiency; on the other hand, the maximum distance that the rotating rod moves along its axial direction can be limited, so that the relative position relationship between the rotating rod and the piston cooling nozzle can be more accurately controlled to further improve assembly accuracy.

[0008] Furthermore, the rotating rod includes a first rod segment and a second rod segment connected along the axial direction of the rotating rod, the outer diameter of the second rod segment is smaller than the outer diameter of the first rod segment, the second rod segment is located at one end of the first rod segment facing the second hole segment, and an accommodating space is defined between the second rod segment and the mounting hole, and the limiting mechanism extends into the accommodating space.

[0009] According to the above technical means, a limiting mechanism is implemented to limit the moving distance of the rotating rod toward one end of the piston cooling nozzle to prevent the rotating rod from escaping from the mounting hole under the action of gravity. In addition, it can prevent the rotating rod from moving too far toward the piston cooling nozzle and affecting the assembly accuracy between the rotating rod and the mounting bolts of the piston cooling nozzle, thereby improving the assembly accuracy of pressing the piston cooling nozzle into the hole of the crankcase.

[0010] Furthermore, the rotating rod further comprises a third rod segment, the third rod segment is connected to an end of the second rod segment away from the first rod segment, and an outer diameter of the second rod segment is smaller than an outer diameter of the third rod segment.

[0011] According to the above technical means, the limiting mechanism can limit the movement of the rotating rod at both ends, and then the movement distance of the rotating rod in its axial direction can be limited to further improve the assembly accuracy.

[0012] Furthermore, the length of the third rod segment is smaller than the length of the first rod segment.

[0013] According to the above technical means, on the one hand, it can play a fool-proof role; on the other hand, the limiting mechanism can be placed adjacent to the piston cooling nozzle to prevent the rotating rod from shifting adjacent to the piston cooling nozzle, so as to further improve the assembly accuracy.

[0014] Furthermore, the rotating rod further includes a fourth rod segment, the fourth rod segment is connected to an end of the third rod segment away from the second rod segment, and the outer diameter of the fourth rod segment is smaller than the outer diameter of the third rod segment.

[0015] According to the above technical means, the relative position relationship between the rotating rod and the piston cooling nozzle can be further accurately controlled to improve the assembly accuracy.

[0016] Further, the limiting mechanism has an annular limiting portion, and the annular limiting portion is sleeved on the outer circumference of the second rod segment; or, the limiting mechanism has an extension section, and the extension section is located on one side of the outer circumference of the second rod segment.

[0017] According to the above technical means, the limiting mechanism has an annular limiting portion, which can ensure uniform force on the rotating rod and improve assembly accuracy; or the limiting mechanism has an extension section, which can facilitate installation to improve assembly efficiency.

[0018] Furthermore, the rotating rod has a limiting hole extending along the axial direction of the rotating rod, and the limiting mechanism extends into the limiting hole.

[0019] According to the above technical means, when the rotating rod moves in the axial direction, the movement of the rotating rod can be limited by abutting against the side walls of the limiting hole at both ends along the axial direction of the rotating rod, so as to improve the assembly accuracy.

[0020] Furthermore, the pre-installation tooling also includes: a magnetic attraction component, which is arranged on the shell and located at the outer periphery of the second hole segment.

[0021] According to the above technical means, the piston cooling nozzle can be prevented from being loosened from the rotating rod, thereby improving the assembly effect and assembly efficiency.

[0022] Furthermore, the shell has a notch communicating with the second hole segment.

[0023] According to the above technical means, the protruding fuel injection pipe of the nozzle body can be accommodated by setting the notch to prevent the nozzle body from relatively rotating when the rotating rod drives the mounting bolt, thereby improving the assembly accuracy and assembly effect.

[0024] Furthermore, the shell is a nylon part.

[0025] According to the above technical means, the nylon shell has a small friction coefficient, which can effectively avoid the risk of damaging the engine block and ensure the assembly quality. In addition, the use of nylon shell is conducive to the lightweight design of pre-installed tooling.

[0026] Beneficial effects of this application:

[0027] (1) The present application sets a limit mechanism. On the one hand, the rotating rod can be restricted on the housing to prevent the housing and the rotating rod from being separated during assembly, so as to facilitate assembly and improve assembly efficiency; on the other hand, the maximum distance that the rotating rod can move along its axial direction can be limited, so that the positional relationship between the rotating rod and the piston cooling nozzle can be more accurately controlled to further improve assembly accuracy.

[0028] (2) In the present application, the shell is configured as a nylon part. Since the friction coefficient of the nylon shell is small, the risk of damaging the engine block can be effectively avoided, and the assembly quality can be ensured. In addition, the use of a nylon shell is conducive to the lightweight design of the pre-installed tooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A half-section view of the pre-installed tooling of an embodiment of the present application;

[0030] Figure 2 A three-dimensional diagram of the pre-installed tooling of an embodiment of the present application;

[0031] Figure 3 This is a schematic diagram of the structure of the pre-installed tooling and the engine according to an embodiment of the present application.

[0032] Among them, 100, pre-installation tooling; 200, piston cooling nozzle; 300, engine cylinder block;

[0033] 10. Shell; 11. First hole section; 12. Second hole section; 13. Limiting hole; 14. Notch;

[0034] 20. Rotating rod; 21. First rod section; 22. Second rod section; 23. Third rod section; 24. Fourth rod section;

[0035] 30. Limiting mechanism; 31. Extension section; 40. Magnetic attraction member; 50. Accommodating space. DETAILED DESCRIPTION

[0036] The following will describe the implementation methods of the present application with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be understood that the preferred embodiments are only for illustrating the present application, not for limiting the scope of protection of the present application.

[0037] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application, and thus the drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0038] In the description of the present application, “plurality” means two or more.

[0039] Reference below Figure 1-Figure 3 The pre-installation tool 100 of the embodiment of the present application is described. The pre-installation tool 100 is used to pre-install the piston cooling nozzle 200. The pre-installation tool 100 includes a housing 10, a rotating rod 20 and a limiting mechanism 30.

[0040] Specifically, if Figure 1-Figure 3 As shown, the housing 10 has a mounting hole that passes through the housing 10; the mounting hole includes a first hole segment 11 and a second hole segment 12 connected to each other along the axial direction of the mounting hole, the aperture of the second hole segment 12 is larger than the aperture of the first hole segment 11, the rotating rod 20 is rotatably disposed in the mounting hole, and the limiting mechanism 30 is disposed on the housing 10, and the limiting mechanism 30 limits the movement of the rotating rod 20 along the axial direction of the rotating rod 20.

[0041] The first hole section 11 can be used to accommodate the rotating rod 20, and the second hole section 12 can be used to accommodate the piston cooling nozzle 200. The hole wall of the second hole section 12 can be adapted to the outer contour of the piston cooling nozzle 200. The first hole section 11 and the second hole section 12 are connected along the axial direction of the mounting hole, and the rotating rod 20 can extend from the first hole section 11 into the second hole section 12. The piston cooling nozzle 200 may include a connected mounting bolt and a nozzle body. When using the pre-installation tool 100, the mounting bolt and the nozzle body are placed in the second hole section 12 as a whole, and the rotating rod 20 is extended into the hole of the mounting bolt, wherein the outer contour of the rotating rod 20 can be adapted to the hole wall of the mounting bolt hole. The staff can drive the mounting bolt to rotate by rotating the rotating rod 20, and then the piston cooling nozzle 200 can be compacted into the hole of the crankcase, so as to facilitate the subsequent tightening step. For example, the cross section of the rotating rod 20 can be a polygon such as a hexagon, so that it can be adapted to the contour of the hole wall of the mounting bolt hole. The outer contour of the housing 10 is a cylinder, and the central axis of the mounting hole may coincide with the central axis of the housing 10. The housing 10 may be an integrally formed part, so as to simplify the structure of the housing 10, facilitate operation, and reduce cost.

[0042] Thus, the piston cooling nozzle 200 is limited by the second hole section 12, so that the piston cooling nozzle 200 can be installed in the housing 10, so that the rotating rod 20 cooperates with the piston cooling nozzle 200 to drive the piston cooling nozzle 200 to rotate, which can improve the assembly accuracy. By setting the limiting mechanism 30, on the one hand, the rotating rod 20 can be limited to the housing 10 to prevent the housing 10 and the rotating rod 20 from being separated during assembly, so as to facilitate assembly and improve assembly efficiency; on the other hand, the maximum distance that the rotating rod 20 moves along the axial direction of the rotating rod 2 can be limited, so that the relative position relationship between the rotating rod 20 and the piston cooling nozzle 200 can be more accurately controlled to further improve the assembly accuracy.

[0043] In some embodiments, Figure 1 As shown, the rotating rod 20 includes a first rod segment 21 and a second rod segment 22 connected along the axial direction of the rotating rod 20, the outer diameter of the second rod segment 22 is smaller than the outer diameter of the first rod segment 21, the second rod segment 22 is located at one end of the first rod segment 21 facing the second hole segment 12, and an accommodation space 50 is defined between the second rod segment 22 and the mounting hole, and the limiting mechanism 30 is disposed on the housing 10 and extends into the accommodation space 50. The limiting mechanism 30 is spaced apart from the second rod segment 22. That is to say, the limiting mechanism 30 can stop at one end of the first rod segment 21 facing the second rod segment 22. Such a setting can realize that the limiting mechanism 30 limits the relative position of one end of the rotating rod 20 toward the piston cooling nozzle 200, so as to prevent the rotating rod 20 from escaping from the mounting hole under the action of gravity, and can prevent the rotating rod 20 from moving too far toward the piston cooling nozzle 200 to affect the assembly accuracy between the rotating rod 20 and the mounting bolts of the piston cooling nozzle 200, so as to improve the assembly accuracy of pressing the piston cooling nozzle 200 into the hole of the crankcase.

[0044] In some embodiments, Figure 1 As shown, the rotating rod 20 further includes a third rod segment 23, which is connected to an end of the second rod segment 22 away from the first rod segment 21, and the outer diameter of the second rod segment 22 is smaller than the outer diameter of the third rod segment 23. In other words, the first rod segment 21, the second rod segment 22 and the third rod segment 23 are sequentially connected along the axial direction of the mounting hole, and the limiting mechanism 30 can abut against an end of the third rod segment 23 facing the second rod segment 22 and an end of the first rod segment 21 facing the first rod segment 22. In this way, the limiting mechanism 30 can limit the movement of the rotating rod 20 at both ends, and further limit the moving distance of the rotating rod 20 in its axial direction, so as to further improve the assembly accuracy.

[0045] Furthermore, if Figure 1As shown, the length of the third rod segment 23 is less than that of the first rod segment 21. That is, the length of the third rod segment 23 in the axial direction of the rotating rod 20 is less than the length of the first rod segment 21 in the axial direction of the rotating rod 20, thereby, on the one hand, it can play a foolproof role; on the other hand, it can make the limiting mechanism 30 close to the piston cooling nozzle 200 to prevent the rotating rod 20 from deviating near the piston cooling nozzle 200, so as to improve the assembly accuracy.

[0046] In some embodiments, Figure 1 As shown, the rotating rod 20 may further include a fourth rod segment 24, which is connected to one end of the third rod segment 23 away from the second rod segment 22, and the outer diameter of the fourth rod segment 24 is smaller than the outer diameter of the third rod segment 23. Thus, the fourth rod segment can be inserted into the hole of the mounting bolt, and the end of the mounting bolt can be stopped at one end of the third rod segment 23 facing the fourth rod segment 24, so as to further accurately control the relative position relationship between the rotating rod 20 and the piston cooling nozzle, and improve the assembly accuracy.

[0047] In some embodiments, the limiting mechanism 30 has an annular limiting portion, which is sleeved on the outer circumference of the second rod segment 22 to ensure uniform force on the rotating rod 20 and improve assembly accuracy; or Figure 1 As shown, the limiting mechanism 30 has an extension section 31, and the extension section 31 is located on one side of the outer periphery of the second rod section 22 to facilitate installation and improve assembly efficiency. For example, the limiting mechanism 30 can be a positioning pin. Both of the above situations can achieve the limitation of the movement of the rotating rod 20 in the axial direction by the limiting mechanism 30.

[0048] Of course, in other embodiments, the rotating rod 20 has a strip hole (not shown) extending in the axial direction of the rotating rod 20, and the limiting mechanism 30 is provided in the housing 10 and can extend into the strip hole. In this way, when the rotating rod 20 moves in its axial direction, the movement of the rotating rod 20 can be limited by abutting against the side walls of the strip hole at both ends in the axial direction of the rotating rod 20, so as to limit the movement of the rotating rod 20 in its axial direction and improve the assembly accuracy.

[0049] Furthermore, in some other embodiments, the limiting mechanism 30 can be a first threaded portion (not shown in the figure) and a second threaded portion (not shown in the figure) of threaded cooperation. The first threaded portion can be arranged on the outer periphery of the rotating rod 20, and the second threaded portion can be arranged on the hole wall of the mounting hole. The length of the second threaded portion is greater than the length of the first threaded portion. When the rotating rod 20 rotates, the second threaded portion can move along the length direction of the first threaded portion. The length direction of the first threaded portion is also the axial direction of the rotating rod 20, and the maximum moving stroke is the length of the first threaded portion. The above three settings can all realize the limitation of the movement of the rotating rod 20 in its axial direction by the limiting mechanism 30.

[0050] In some embodiments, Figure 1 As shown, the pre-assembly tool 100 may also include: a magnetic member 40, for example, the magnetic member 40 may be a magnet. The magnetic member 40 is disposed on the housing 10 and is located at the periphery of the second hole section 12. In order to ensure the reliability of the matching between the rotating rod 20 and the piston cooling nozzle 200 during assembly, the present application provides a magnetic member 40 on the periphery of the second hole section 12, and the magnetic member 40 may generate an attractive force with the piston cooling nozzle 200 to prevent the piston cooling nozzle 200 from loosening from the rotating rod 20, thereby improving the assembly effect and efficiency.

[0051] For example, there may be multiple magnetic members 40, which are spaced apart along the circumferential direction of the second hole segment 12 to increase the attraction to the piston cooling nozzle 200. For example, there may be two magnetic members 40, which are relatively arranged along the radial direction of the second hole segment 12, so that the piston cooling nozzle 200 can be uniformly stressed, which is conducive to ensuring the balance of the piston cooling nozzle 200 and improving the assembly accuracy.

[0052] In some embodiments, Figure 2 As shown, the outer periphery of the second hole section 12 is provided with a limiting hole 13, and the magnetic attraction member 40 is arranged in the limiting hole 13, and the limiting hole 13 is connected to the second hole section 12. Thus, the attraction of the magnetic attraction member 40 to the piston cooling nozzle 200 can be improved, so as to further improve the assembly reliability and assembly accuracy.

[0053] In some embodiments, Figure 2 As shown, the housing 10 has a notch 14 connected to the second hole segment 12. For example, the notch 14 can be formed by a portion of the outer peripheral wall of the second hole segment 12 being recessed toward the direction of the first hole segment 11, and the notch 14 is formed at the end of the housing 10 in the axial direction. By providing the notch 14, the protruding injection pipe of the nozzle body can be accommodated to prevent the nozzle body from relatively rotating when the rotating rod 20 drives the mounting bolt, so as to improve the assembly accuracy and assembly effect.

[0054] In some embodiments, the housing 10 may be a nylon member. The nylon housing 10 has a low friction coefficient, which can effectively avoid the risk of damaging the engine block 300 and ensure assembly quality. The nylon housing 10 is also conducive to the lightweight design of the pre-installation tool 100.

[0055] Other structures and operations of the engine of the embodiment of the present application, such as the crankcase, are well known to ordinary technicians in the field and will not be described in detail here.

[0056] For ease of description, spatial relative terms may be used herein to describe the relative positional relationship or movement of one element or feature relative to another element or feature as shown in the figure, such as "center", "axial", "circumferential", "radial", "inside", "outside", "up", "down", "left", "right", "front", "back", "length", "width", "thickness", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation other than the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip or a posture change or a motion state change, then these directional indications also change accordingly, for example: an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." may include both the above and below orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative descriptors used herein are interpreted accordingly.

[0057] The above embodiments are only preferred embodiments for fully illustrating the present application, and the protection scope of the present application is not limited thereto. Any equivalent substitution or change made by a person skilled in the art based on the present application is within the protection scope of the present application.

Claims

1. A pre-installed tool, characterized in that: include: A housing, wherein the housing has a mounting hole penetrating the housing, the mounting hole comprising a first hole section and a second hole section connected along an axial direction thereof, and the aperture of the second hole section is larger than the aperture of the first hole section; A rotating rod, the rotating rod being rotatably disposed in the mounting hole; A limiting mechanism is provided on the housing, and the limiting mechanism limits the movement of the rotating rod along the axial direction thereof.

2. The pre-installed tooling according to claim 1, characterized in that: The rotating rod includes a first rod segment and a second rod segment connected along its axial direction, the outer diameter of the second rod segment is smaller than the outer diameter of the first rod segment, the second rod segment is located at one end of the first rod segment facing the second hole segment, an accommodating space is defined between the second rod segment and the mounting hole, and the limiting mechanism extends into the accommodating space.

3. The pre-installed tooling according to claim 2, characterized in that: The rotating rod further includes a third rod segment, the third rod segment is connected to an end of the second rod segment away from the first rod segment, and the outer diameter of the second rod segment is smaller than the outer diameter of the third rod segment.

4. The pre-installed tooling according to claim 3, characterized in that: The length of the third rod segment is smaller than the length of the first rod segment.

5. The pre-installed tooling according to claim 3, characterized in that: The rotating rod further includes a fourth rod segment, the fourth rod segment is connected to an end of the third rod segment away from the second rod segment, and the outer diameter of the fourth rod segment is smaller than the outer diameter of the third rod segment.

6. The pre-installed tooling according to claim 2, characterized in that: The limiting mechanism has an annular limiting portion, and the annular limiting portion is sleeved on the outer circumference of the second rod segment; or the limiting mechanism has an extension segment, and the extension segment is located on one side of the outer circumference of the second rod segment.

7. The pre-installed tooling according to claim 1, characterized in that: The rotating rod has a limiting hole extending along its axial direction, and the limiting mechanism extends into the limiting hole.

8. The pre-installed tooling according to claim 7, characterized in that: Also includes: A magnetic attraction component is arranged on the shell and located at the outer periphery of the second hole segment.

9. The pre-installed tooling according to claim 1, characterized in that: The housing has a notch communicating with the second hole segment.

10. The pre-installed tooling according to claim 1, characterized in that: The shell is a nylon part.

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