An integrated main bearing cap hoisting tool and method

Abstract

The application relates to a one-piece main bearing cover hoisting tool and method, which comprises a crossbeam provided with at least two hangers, the bottom end of the hangers is provided with oppositely arranged first and second fixing blocks, the first fixing block is in telescopic connection with a first telescopic block, the second fixing block is in telescopic connection with a second telescopic block, and the first and second telescopic blocks are connected with a telescopic mechanism arranged on the hangers; the first and second telescopic blocks are driven by the telescopic mechanism to extend out to cooperate with the cavity structure of the main bearing cover to realize the fixation of the main bearing cover, and the hoisting tool improves the assembly efficiency of the main bearing end cover and is higher in safety.

Description

Technical Field

[0001] The present invention relates to the technical field of engine assembly and manufacturing, and in particular to an integrated main bearing cover hoisting tool and method. Background Art

[0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] In order to achieve the requirements of high power, low fuel consumption, low emission and high power density, the main bearing cap of the diesel engine adopts an integrated structure rather than an independent split structure, which is called the base. The seven main bearing seats are connected as one, and the engine body, main bearing shell, crankshaft, main bearing bolts and other related parts are assembled as a whole. Figures 1-2 As shown, the assembly of the body 2 and the base 4 is connected by the main bearing bolt 3 that passes through the base and the body. The upper part of the main bearing bolt 3 is screwed into the main bearing nut 1, and the main bearing nut 1 is fixed to the top surface of the body 2 by a small bolt. The other end of the main bearing bolt 3 is installed with a main bearing washer 5, and then the main bearing nut 6 is used to apply torque and tighten it, so that the body 2 and the base 4 form a whole.

[0004] When assembling the crankshaft, main bearing and base of the engine, see Figure 3 . First, install the main bearing nut 1 on the top of the body 2. The main bearing nut 1 is fixed to the top of the body 2 by bolts. Install the main bearing bolt 3 that runs through the entire body and the base at the internal thread of the main bearing nut 1 (the main bearing bolt 3 is a double-headed stud type with threads at both ends), so that the main bearing bolt 3 passes through the body 2. Turn the body 2 180° with the top surface facing down, install the main bearing shell 7 at the main bearing installation position of the body, and then hoist the crankshaft 8 to the main installation position. The installation position of the lower main bearing shell 9 of the base is facing down, and the lower main bearing shell 9 is assembled at the main bearing seat of the base. By hoisting, the base passes through the two main bearing bolts 3 at each main bearing stop, for a total of 14 main bearing bolts 3. There is a locating pin structure at each main bearing seat of the base 4 and the body 2, which are arranged at intervals on the left and right, with a total of 7 locating pins 10. The base 4 passes through the main bearing bolt 3 and the positioning pin 10 to complete the assembly with the machine body. Then the main bearing washer 5 and the main bearing nut 6 are installed and the main bearing nut is tightened. The assembly of the machine body and the base is completed.

[0005] like Figure 4As shown, during the assembly of the base, the previous method was to use a sling to pass through the cast weight-reducing holes at both ends of the base for lifting operations. First, this method causes direct contact between the sling and the metal workpiece, which will cause certain wear and tear on the sling, posing a safety hazard. The safety of the sling must be checked from time to time. The weight-reducing holes at both ends of the base are small, and when passing through the sling, it is easy for the sling to rub against the workpiece and cause damage. The thickness of the sling is limited and can just meet the weight requirements for lifting. Secondly, the weight-reducing holes at both ends of the base are unevenly distributed, making it impossible for the base to remain horizontal after lifting. As a result, when passing through the 14 main bearing bolts, it is difficult to align the base and the machine body through the locating pins, which can easily cause jamming, damage the main bearing bolts, and prevent installation. Another operator is required to assist, resulting in reduced production efficiency. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide an integrated main bearing cover lifting tool and method, which improves the assembly efficiency of the base and the body, reduces the number of operators, and avoids safety problems caused during assembly.

[0007] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0008] In a first aspect, an embodiment of the present invention provides an integrated main bearing cap lifting tool, comprising a crossbeam, the crossbeam being provided with at least two hangers, the bottom ends of the hangers being provided with a first fixed block and a second fixed block disposed opposite each other, the first fixed block being telescopically connected to a first telescopic block, the second fixed block being telescopically connected to a second telescopic block, the first telescopic block and the second telescopic block being connected to a telescopic mechanism mounted on the hanger;

[0009] The first telescopic block and the second telescopic block are extended under the drive of the telescopic mechanism to cooperate with the cavity structure of the main bearing cap to fix the main bearing cap.

[0010] Optionally, the telescopic mechanism includes a rotating shaft rotatably connected to the bottom of the hanger, the bottom end of the rotating shaft is fixedly connected to the center part of the intermediate rod, one end of the intermediate rod is hinged to one end of the first connecting rod, the other end of the first connecting rod is hinged to the first telescopic block, the other end of the intermediate rod is hinged to one end of the second connecting rod, and the other end of the second connecting rod is hinged to the second telescopic block.

[0011] Optionally, a handle is provided at the top end of the rotating shaft.

[0012] Optionally, the hanger is slidably connected to the crossbeam, and a first locking member is provided between the hanger and the crossbeam to lock and fix the hanger and the crossbeam.

[0013] Optionally, limit plates are provided at both ends of the crossbeam to prevent the hanger from sliding off the crossbeam.

[0014] Optionally, the top surface of the beam is provided with a lifting lug for connecting a lifting device.

[0015] Optionally, the lifting ear is slidably connected to the lifting ear base and a second locking member is provided between the lifting ear base and the lifting ear base, and the lifting ear base is fixed to the crossbeam.

[0016] Optionally, two hangers are provided, and the two hangers are respectively located on both sides of the lifting ear.

[0017] Optionally, the hanger includes a U-shaped plate, which is buckled on the crossbeam, and the bottom end of the U-shaped plate is fixedly connected to the top surface of the gantry. The bottom end of the gantry is connected to a support plate, and the bottom surface of the support plate is provided with a first fixed block and a second fixed block.

[0018] In a second aspect, an embodiment of the present invention provides a method for hoisting the integrated main bearing cap according to the first aspect, comprising the following steps:

[0019] Place the first fixed block, the second fixed block, the first telescopic block retracted into the first fixed block, and the second telescopic block retracted into the second fixed block into the cavity structure of the main bearing cap, with the bottom surface of the hanger in contact with the top surface of the main bearing cap;

[0020] The first telescopic block and the second telescopic block are extended by the telescopic mechanism, and the first telescopic block and the second telescopic block cooperate with the bottom surface of the hanger to clamp the boss at the top edge of the cavity structure to fix the main bearing cap;

[0021] The crossbeam is lifted and transported to enable the main bearing cover to be hoisted.

[0022] The beneficial effects of the present invention are as follows:

[0023] 1. The main bearing cover lifting tool and method of the present invention are provided with a first fixing block and a second fixing block relatively arranged at the bottom of the hanger, the first fixing block is telescopically connected to the first telescopic block, the second fixing block is telescopically connected to the second telescopic block, the first telescopic block and the second telescopic block are connected to the telescopic mechanism, and after the first fixing block, the second fixing block, the first telescopic block and the second telescopic block are placed in the cavity structure of the main bearing cover, the telescopic mechanism can drive the first telescopic block and the second telescopic block to extend, thereby cooperating with the bottom surface of the hanger to clamp the protrusion of the edge of the top surface of the cavity structure, thereby achieving the fixation of the main bearing cover, without using a sling to pass through the weight-reducing hole to fix the main bearing cover, avoiding the safety problem caused by the friction damage of the sling, and the first and second telescopic blocks of the multiple hangers cooperate with the cavity structure, and the cavity structure is evenly distributed on the main bearing cover, so that the main bearing cover can maintain a horizontal state after lifting, which is convenient for alignment, improves assembly efficiency, and does not require personnel for alignment, saving labor.

[0024] 2. The main bearing cover lifting tool and method of the present invention are characterized in that the hanger is slidably connected to the crossbeam and is provided with a first locking member, which can adjust the position of the hanger on the crossbeam; the lifting ear base is slidably connected to the crossbeam and is provided with a second locking member, which can adjust the position of the lifting ear on the crossbeam, thereby meeting the lifting requirements of main bearing covers of different specifications and improving the applicability of the lifting tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0026] Figure 1 This is the main sectional view of the diesel engine body and base assembly;

[0027] Figure 2 It is a side sectional view of the diesel engine block and base assembly;

[0028] Figure 3 It is an exploded diagram of the diesel engine block, base, main bearing, and crankshaft assembly;

[0029] Figure 4 This is a schematic diagram of the existing diesel engine base hoisting;

[0030] Figure 5 This is a schematic diagram of the overall structure of Example 1 of the present invention;

[0031] Figure 6 This is a schematic diagram of the first telescopic block and the second telescopic block in the retracted state according to embodiment 1 of the present invention;

[0032] Figure 7 This invention Figure 6 Bottom view of

[0033] Figure 8 This invention Figure 6 The main view;

[0034] Figure 9 This invention Figure 6 Side view of;

[0035] Figure 10 This is a schematic diagram of the first telescopic block and the second telescopic block in the extended state according to embodiment 1 of the present invention;

[0036] Figure 11 This invention Figure 10 Bottom view of

[0037] Figure 12 This invention Figure 10 The main view;

[0038] Figure 13 This invention Figure 10Side view of

[0039] Figure 14 This is a schematic diagram of the coordination between the lifting tool and the base in step 1 of embodiment 2 of the present invention. Figure 1 ;

[0040] Figure 15 This is a schematic diagram of the coordination between the lifting tool and the base in step 1 of embodiment 2 of the present invention. Figure 2 ;

[0041] Figure 16 This is a schematic diagram of the cooperation between the lifting tool and the base in step 2 of embodiment 2 of the present invention;

[0042] Among them, 1. main bearing nut, 2. machine body, 3. main bearing bolt, 4. base, 5. main bearing washer, 6. main bearing nut, 7. upper main bearing, 8. crankshaft, 9. lower main bearing, 10. locating pin, 11. crossbeam, 12. lifting ear, 13. first fixed block, 14. second fixed block, 15. first telescopic block, 16. second telescopic block, 17. U-shaped plate, 18. gantry, 19. support plate, 20. limit plate, 21. rotating shaft, 22. retaining ring, 23. intermediate rod, 24. first connecting rod, 25. second connecting rod, 26. handle, 27. lifting ear base, 28. cavity structure. DETAILED DESCRIPTION

[0043] For the convenience of description, if the words "upper" and "lower" appear in the present invention, they only indicate that they are consistent with the upper and lower directions of the drawings themselves, and do not limit the structure. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0044] Example 1

[0045] This embodiment provides an integrated main bearing cap lifting tool, such as Figures 5-13 As shown, it includes a crossbeam 11, and the crossbeam 11 is provided with at least two hangers. In this embodiment, the top surface of the crossbeam is provided with a lifting lug 12, and the lifting lug 12 is used to cooperate with the lifting equipment. There are two hangers, and the two hangers are respectively provided on both sides of the lifting lug 12.

[0046] The bottom of the hanger is provided with a first fixed block 13 and a second fixed block 14 arranged opposite to each other. The first fixed block 13 is telescopically connected to the first telescopic block 15, and the second fixed block 14 is telescopically connected to the second telescopic block 16. The first telescopic block 15 and the second telescopic block 16 are connected to a telescopic mechanism installed on the hanger. The telescopic mechanism can drive the first telescopic block 15 to retract into the first fixed block 13 and extend out of the first fixed block 13, and at the same time, synchronously drive the second telescopic block 16 to retract into the second fixed block 14 and extend out of the second fixed block 14.

[0047] Specifically:

[0048] The crossbeam 11 is made of square steel.

[0049] The hanger includes a U-shaped plate 17, a gantry 18 and a support plate 19 which are sequentially arranged from top to bottom.

[0050] The U-shaped plate 17 is buckled on the beam 11 and includes a horizontal portion and vertical portions provided at both ends of the horizontal portion. The horizontal portion contacts the top surface of the beam 11 and the two vertical portions contact the two side surfaces of the beam 11 respectively.

[0051] After the U-shaped plate 17 is buckled onto the crossbeam 11 , the vertical portion and the side surface of the crossbeam 11 are provided with corresponding pairs of fixing holes, and bolts are passed through the fixing holes and nuts are tightened to fix the U-shaped plate 17 to the crossbeam 11 .

[0052] In another embodiment, to meet the requirements for hoisting main bearing caps of different specifications, the U-shaped plate 17 is slidably connected to the crossbeam 11, and a first locking member is provided between the U-shaped plate 17 and the crossbeam 11 to lock and secure the U-shaped plate 17 to the crossbeam 11. The first locking member is a locking bolt and a locking nut. The side of the crossbeam 11 is provided with an elongated hole along its length, and the vertical portion is provided with a fixing hole corresponding to the elongated hole. The locking bolt passes through the elongated hole and the fixing hole, passes through the two vertical portions and the crossbeam 11, and then the locking nut is tightened. The locking nut and the head of the locking bolt press the two vertical portions against the side of the crossbeam 11. When the locking bolt and locking nut are loosened, the rod of the locking bolt slides along the elongated hole, and the U-shaped plate slides along the crossbeam 11, thereby achieving position adjustment of the hanger.

[0053] When this embodiment is adopted, both ends of the crossbeam 11 are fixed with limit plates 20 by bolts, and the limit plates 20 are used to prevent the hanger from sliding off the crossbeam.

[0054] The gantry 18 includes a horizontal frame and vertical frames located at both ends of the horizontal frame. The top surface of the horizontal frame is fixedly connected to the bottom ends of the two vertical parts of the U-shaped plate 17, and the bottom ends of the two vertical frames are fixedly connected to the upper surface of the support plate 19.

[0055] The first fixing block 13 is fixed to the lower surface of the support plate 19 by multiple bolts, and the second fixing block 14 is fixed to the lower surface of the support plate 19 by multiple bolts. The first fixing block 13 and the second fixing block 14 are coaxially arranged relative to each other, that is, the line connecting the centers of the first fixing block 13 and the second fixing block 14 is arranged along a length direction perpendicular to the beam 11.

[0056] The first telescopic block 15 is arranged through the first fixed block 13 and is in sliding connection with the first fixed block 13 to realize telescopic movement, and the second telescopic block 16 is arranged through the second fixed block 14 and is in sliding connection with the second fixed block 14 to realize telescopic movement.

[0057] In the embodiment, the first telescopic block 15 and the second telescopic block 16 are coaxially arranged, the first telescopic block 15 is coaxially arranged with the first fixed block 13, and the second telescopic block 16 is coaxially arranged with the second fixed block 14.

[0058] The telescopic directions of the first telescopic block 15 and the second telescopic block 16 are perpendicular to the length direction of the cross beam 11.

[0059] The distance between the top surfaces of the first telescopic block 15 and the second telescopic block 16 and the bottom surface of the support plate 19 matches the thickness of the top edge protrusion of the main bearing cover cavity structure.

[0060] The first telescopic block 15 and the second telescopic block 16 are connected with a telescopic mechanism to realize telescopic movement of the first telescopic block 15 and the second telescopic block 16.

[0061] The telescopic mechanism comprises a rotating shaft 21 vertically passing through the support plate 19 and being in rotary connection with the support plate 19 through a bearing or a check ring 22, when the check ring 22 is used, the check ring 22 is fixedly connected with the support plate 19 and is embedded in a ring-shaped groove arranged on the rotating shaft 21, and the rotating shaft 21 can rotate around its own axis, in the embodiment, the rotating shaft 21 is arranged between the two vertical frames of the portal frame 18 and the two vertical frames are symmetrically arranged relative to the rotating shaft 21.

[0062] The bottom end of the rotating shaft 21 is fixedly connected with the central part of the intermediate rod 23 and can drive the intermediate rod 23 to rotate, one end of the intermediate rod 23 is hingedly connected with one end of the first connecting rod 24, the other end of the first connecting rod 24 is hingedly connected with the first telescopic block 15, the other end of the intermediate rod 23 is hingedly connected with one end of the second connecting rod 25, and the other end of the second connecting rod 25 is hingedly connected with the second telescopic block 16.

[0063] Rotating the rotating shaft 21 can drive the first telescopic block 15 and the second telescopic block 16 to synchronously perform telescopic movement through the intermediate rod 23, the first connecting rod 24 and the second connecting rod 25.

[0064] In order to facilitate an operator to rotate the rotating shaft 21, a handle 26 is arranged at the top end of the rotating shaft 21 and is vertically arranged relative to the rotating shaft, and the operator can rotate the rotating shaft through the handle.

[0065] The top surface of the cross beam 11 is provided with a lifting lug 12, the lifting lug 12 is fixedly connected with a lifting lug base 27 through a plurality of bolts, the lifting lug base 27 is fixed on the upper surface of the cross beam 11, and the lifting lug base 27 is fixedly welded with the upper surface of the cross beam 11.

[0066] In another embodiment, the lug base 27 is welded and fixed on the upper surface of the crossbeam 11, the lug 12 comprises a mountain-shaped vertical plate and a rectangular horizontal plate, the vertical plate is welded and fixed perpendicularly with the horizontal plate, the vertical plate is provided with a lifting hole, the horizontal plate is in sliding connection with the lug base 27, the horizontal plate is provided with a first long slot, the lug base is provided with a second long slot corresponding to the first long slot, the long axis of the first long slot and the second long slot are arranged along the length direction of the crossbeam, the length of the first long slot is smaller than the length of the second long slot, a locking bolt is passed through the first long slot and the second long slot, the locking bolt is screwed with a locking nut to realize the locking and fixing of the lug and the lug base 27, the locking bolt and the locking nut are used as the second locking member, in this way, the first long slot and the second long slot can realize the fine adjustment of the lug 12 along the length direction of the crossbeam to adapt to different main bearing seat structures.

[0067] Embodiment 2

[0068] The embodiment provides a method for hoisting the integrated main bearing cover hoisting tool in embodiment 1, and the method comprises the following steps:

[0069] Step 1: cooperate the lug with the lifting equipment, rotate the rotating shaft 21, and shrink the first telescopic block 15 into the first fixed block 13 and the second telescopic block 16 into the second fixed block 14.

[0070] As shown in Figures 14-15 , the lifting equipment is used for lifting, the first fixed block 13, the second fixed block 14, the first telescopic block 15 and the second telescopic block 16 are placed into the corresponding cavity structure 28 of the main bearing cover, and the supporting plate 19 is in contact with the top surface of the main bearing cover.

[0071] Step 2: as shown in Figure 16 , rotate the rotating shaft 21, so that the first telescopic block 15 is stretched out to the outside of the first fixed block 13, the second telescopic block 16 is stretched out to the outside of the second fixed block 14, the first telescopic block 15 and the second telescopic block 16 cooperate with the supporting plate 19 to clamp the protrusions on the top edge of the cavity structure 28, thereby realizing the fixing of the hoisting tool and the main bearing cover.

[0072] Step 3: the crossbeam 11 is lifted and transported by using the lifting equipment, the main bearing cover is hoisted to cooperate with the machine body, then the main bearing gasket and the main bearing nut are installed, and the fixing of the main bearing cover and the machine body can be realized.

[0073] The lifting tool of the embodiment is simple to operate and strong in stability, does not need to use a lifting belt to pass through the lightening hole to fix the main bearing cover, avoids the safety problem caused by the friction damage of the lifting belt, improves safety, the first telescopic block and the second telescopic block at the bottom of the plurality of lifting frames cooperate with the cavity structure, the distribution of the cavity structure on the main bearing cover is uniform, therefore, the main bearing cover can be kept in a horizontal state after being lifted, the center of gravity of the main bearing cover does not need to be grasped during lifting, the alignment is convenient, the main bearing bolt is avoided from being scratched, the dislocation condition during the connection through the positioning pin is avoided, the assembly efficiency is improved, personnel for alignment is not needed to be configured, labor is saved, one operator can complete the assembly operation, and the labor efficiency is improved by 50%.

[0074] The above merely describes the preferred embodiments of the present application and is not intended to limit the present application. The present application can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. The integrated main bearing cap lifting tool is characterized by: The crossbeam is provided with at least two hangers, the hangers including a U-shaped plate, the U-shaped plate being buckled on the crossbeam, the bottom end of the U-shaped plate being fixedly connected to the top surface of the gantry, the bottom end of the gantry being connected to a support plate, the bottom surface of the support plate being provided with a first fixed block and a second fixed block being oppositely arranged, the first fixed block being telescopically connected to the first telescopic block, the second fixed block being telescopically connected to the second telescopic block, the first telescopic block and the second telescopic block being connected to a telescopic mechanism installed on the hanger; The distance between the top surfaces of the first and second telescopic blocks and the bottom surface of the support plate matches the thickness of the protrusion at the top edge of the main bearing cap cavity structure. Driven by the telescopic mechanism, the first and second telescopic blocks extend to cooperate with the cavity structure of the main bearing cap to secure the main bearing cap. The bottom surface of the support plate can contact the top surface of the main bearing cap. The outer side surfaces of the first fixing block and the second fixing block are frustum-shaped structures matching the edges of the main bearing cap cavity structure; The top surface of the crossbeam is provided with a lifting lug for connecting a lifting device; The lifting ear is slidably connected to the lifting ear base and a second locking member is provided between the lifting ear base and the lifting ear base, and the lifting ear base is fixed to the crossbeam; The U-shaped plate includes a horizontal portion and vertical portions provided at both ends of the horizontal portion. The U-shaped plate is slidably connected to the crossbeam, and a first locking member is provided between the U-shaped plate and the crossbeam to lock and fix the U-shaped plate to the crossbeam. The first locking member adopts a locking bolt and a locking nut. The side of the crossbeam is provided with an elongated hole provided along its length direction, and the vertical portion is provided with a fixing hole corresponding to the elongated hole. The locking bolt passes through the two vertical portions and the crossbeam through the elongated hole and the fixing hole. When the locking bolt and the locking nut are loosened, the rod of the locking bolt slides along the elongated hole, and the U-shaped plate slides along the crossbeam. The lifting ear includes a peak-shaped vertical plate and a rectangular horizontal plate; the horizontal plate is provided with a first long hole, and the base of the lifting ear is provided with a second long hole corresponding to the first long hole; through the first long hole and the second long hole, the lifting ear can be fine-tuned along the length of the beam to adapt to different main bearing seat structures.

2. The integrated main bearing cap lifting tool according to claim 1, characterized in that: The telescopic mechanism includes a rotating shaft rotatably connected to the bottom of the hanger, the bottom end of the rotating shaft is fixedly connected to the center of the intermediate rod, one end of the intermediate rod is hinged to one end of the first connecting rod, the other end of the first connecting rod is hinged to the first telescopic block, the other end of the intermediate rod is hinged to one end of the second connecting rod, and the other end of the second connecting rod is hinged to the second telescopic block.

3. The integrated main bearing cap lifting tool according to claim 2, characterized in that: A handle is provided at the top end of the rotating shaft.

4. The integrated main bearing cap lifting tool according to claim 1, characterized in that: The hanger is slidably connected to the crossbeam, and a first locking member is provided between the hanger and the crossbeam to lock and fix the hanger and the crossbeam.

5. The integrated main bearing cap lifting tool according to claim 4, characterized in that: Limiting plates are provided at both ends of the crossbeam to prevent the hanger from sliding off the crossbeam.

6. The integrated main bearing cap lifting tool according to claim 1, characterized in that: Two hangers are provided, and the two hangers are respectively located on both sides of the lifting ear.

7. A method for hoisting the integrated main bearing cap according to any one of claims 1 to 6, characterized in that: The following steps are involved: Place the first fixed block, the second fixed block, the first telescopic block retracted into the first fixed block, and the second telescopic block retracted into the second fixed block into the cavity structure of the main bearing cap, with the bottom surface of the hanger in contact with the top surface of the main bearing cap; The first telescopic block and the second telescopic block are extended by the telescopic mechanism, and the first telescopic block and the second telescopic block cooperate with the bottom surface of the hanger to clamp the boss at the top edge of the cavity structure to fix the main bearing cap; The crossbeam is lifted and transported to enable the main bearing cover to be hoisted.

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