An assembly apparatus for a marine diesel engine camshaft bushing

Abstract

The application discloses a kind of equipment of marine diesel engine camshaft bushing assembly, including pressing rod, the front end of pressing rod is equipped with joint, the circumferential side wall of the rear end of pressing rod is radially provided with several fixed components, fixed component includes the recess being opened in the side wall of pressing rod, movable block being supported in recess by elastic element, rotating part and limiting part being arranged on the outer side surface of movable block, rotating part is used for the depth of pressing rod insertion camshaft shaft hole equal to the contact with the inner wall of camshaft shaft hole when being set depth and make pressing rod rotatable along the circumferential direction, limiting part is used for the depth of pressing rod insertion camshaft shaft hole greater than the contact with the inner wall of camshaft shaft hole when being set depth and limit pressing rod rotation along the circumferential direction;Equipment also includes adjusting member for adjusting the orientation of bushing oil hole.This assembly equipment realizes the fixation of pressing rod and the inner wall of camshaft shaft hole in the circumferential position of pressing rod, need not to borrow diesel engine end face screw hole, and can be suitable for different sizes of diesel engine camshaft shaft hole, wide application and easy to operate.

Description

TECHNICAL FIELD

[0001] The present application relates to the diesel engine assembly technical field, specifically relates to a kind of marine diesel engine camshaft bushing's equipment. BACKGROUND

[0002] The camshaft bushing of marine diesel engine, as the important component of diesel engine valve gear, when installing, its position must be accurate and effective, make bushing oil hole and the inclined oil hole (hereinafter referred to as inclined oil hole) of through main shaft hole and camshaft hole are aligned, to ensure that diesel engine lubricating oil circuit is unobstructed.In actual press fitting process, even if the pre-positioning of bushing is completed in advance, and the initial orientation of bushing oil hole is controlled to make it align the inclined oil hole direction, bushing still rotates in circumferential direction in bushing press-in operation, and then make bushing oil hole finally unable to align the inclined oil hole.

[0003] For this problem, the Chinese patent document with publication number CN102950453A discloses a heavy diesel engine camshaft bushing installation tool, which specifically includes a press rod and a guide sleeve fitted on the press rod, the press rod includes a joint and a punch, and a connecting pipe connecting the joint and the punch, the joint has a bushing positioning part, the punch has a stop protrusion and a guide key arranged in an axially extending guide key groove, the guide sleeve has a guide groove inside, when the press rod penetrates the guide sleeve, the guide key of the punch extends into the guide groove of the guide sleeve, and is limited by the stop protrusion. This installation tool can prevent the press rod from rotating during press fitting by the limiting effect of the guide sleeve, thereby avoiding the phenomenon that bushing oil hole and inclined oil hole cannot align after assembly. However, this installation tool has the following defects: the guide sleeve needs to be fixed on the end face of diesel engine camshaft hole by using a hexagonal cylindrical head screw before press fitting, and the screw hole position, model and the like on the end face of diesel engine camshaft hole are not unique, so the use limitation of this installation tool is relatively large, and multiple models of guide sleeves need to be provided for different diesel engine camshaft holes, which is very troublesome. SUMMARY

[0004] The present application aims to provide a kind of marine diesel engine camshaft bushing's equipment, which solves the defects existing in the measures adopted by existing assembly equipment when facing the problem that bushing oil hole and inclined oil hole cannot align.

[0005] The present application realizes the above-mentioned purpose by the following technical solutions:

[0006] The application discloses an assembling device for a camshaft bushing of a marine diesel engine, which comprises a pressing rod, a joint is arranged at the front end of the pressing rod, a positioning part for positioning an oil hole of the bushing is arranged on the joint, a plurality of fixing assemblies are radially arranged on the circumferential side wall of the rear end of the pressing rod, each of the fixing assemblies comprises a groove arranged on the circumferential side wall of the pressing rod, a movable block arranged in the groove and supported along the radial direction of the pressing rod by an elastic element, and a rotating part and a limiting part arranged on the outer side of the movable block and arranged in front of and behind each other, wherein the rotating part is used for contacting the inner wall of the shaft hole of the camshaft when the depth of the pressing rod inserted into the shaft hole of the camshaft is equal to a set depth, and the rotating part is used for enabling the pressing rod to rotate along the circumferential direction; and the limiting part is used for contacting the inner wall of the shaft hole of the camshaft when the depth of the pressing rod inserted into the shaft hole of the camshaft is greater than the set depth, and the limiting part is used for limiting the pressing rod from rotating along the circumferential direction.

[0007] The device further comprises an adjusting element for adjusting the orientation of the oil hole of the bushing so as to align the oil hole of the bushing with the inclined oil hole of the camshaft.

[0008] Further improvement lies in that the rotating part comprises an insertion block and a rotating block, the distance between the outer side of the insertion block and the axis of the pressing rod gradually increases from front to back, the distance between the outer side of the rotating block and the axis of the pressing rod is equal to the maximum distance between the outer side of the insertion block and the axis of the pressing rod, and a plurality of rolling balls are arranged on the outer side of the rotating block.

[0009] Further improvement lies in that the outer sides of the insertion block and the rotating block are both arc surfaces, and the centers of the arc surfaces are both located on the axis of the pressing rod.

[0010] Further improvement lies in that the limiting part comprises an axle seat and a movable rod rotatably arranged on the axle seat, a coil spring is arranged on the axle seat, the movable rod is composed of a first rod body and a second rod body which are perpendicular to each other, under the action of the coil spring, the first rod body tends to extend outward along the radial direction of the pressing rod, the second rod body tends to extend forward along the axial direction of the pressing rod, and a rolling plane is arranged on the second rod body and a roller is arranged on the rolling plane and coincides with the axis of the pressing rod.

[0011] Further improvement lies in that the length of the first rod body satisfies that at least a part of the first rod body contacts the end surface of the shaft hole of the camshaft when the depth of the pressing rod inserted into the shaft hole of the camshaft is equal to the set depth, and the length of the second rod body satisfies that when the depth of the pressing rod inserted into the shaft hole of the camshaft is greater than the set depth and the first rod body rotates under the block of the end surface of the shaft hole of the camshaft, the second rod body rotates synchronously and the distance between the outer side of the rolling wheel and the axis of the pressing rod is greater than the distance between the outer side of the rotating block and the axis of the pressing rod.

[0012] Further improvement lies in that a through hole penetrating through the front and the back is arranged in the pressing rod, the adjusting element comprises a center rod, the center rod is movably inserted into the through hole and is connected with the through hole by a flat key, the end of the center rod is connected with a telescopic rod through a spring shaft, and the telescopic rod tends to be perpendicular to the center rod and faces the same direction as the positioning part under the action of the spring shaft.

[0013] A further improvement is that the telescopic rod consists of an outer sleeve rod, an inner sleeve rod, and a spring located between the outer sleeve rod and the inner sleeve rod, and ball bearings are provided at the end of the telescopic rod.

[0014] A further improvement is that the positioning part includes a pressure plate disposed on the side of the connector, a columnar groove located inside the pressure plate, and a steel ball located in the columnar groove and supported by a spring.

[0015] A further improvement is that the rear end of the pressure rod is also provided with a connecting plate for connecting to the stamping equipment.

[0016] The beneficial effects of this invention are as follows: the assembly equipment achieves the fixation of the pressure rod to the inner wall of the camshaft bore at the circumferential position of the pressure rod, without the need for the diesel engine end face screw hole, and can be applied to diesel engine camshaft bores of different sizes, with wide applicability and convenient operation; the fixing components play a dual role of guiding and limiting during assembly. First, through the rolling support of the rotating part and the end face stop of the first rod of the limiting part, it is convenient to adjust the orientation of the bushing with the adjustment component. Second, through multiple sets of fixing components, the pressure rod automatically falls to the center position of the camshaft bore, and the second rod of the limiting part can automatically rotate during assembly and make its roller press against the inner wall of the bore, making the pressure rod pressing process smooth and preventing circumferential rotation, thereby ensuring that the final bushing oil hole is aligned with the inclined oil hole. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the assembly equipment when the adjusting component does not protrude from the bottom of the through hole;

[0018] Figure 2 This is a schematic diagram of the assembly equipment when the adjusting component extends from the bottom of the through hole;

[0019] Figure 3 for Figure 1 Enlarged view of point A in the middle;

[0020] Figure 4 for Figure 2 Enlarged view of point B in the middle;

[0021] Figure 5 A schematic diagram showing the insertion depth of the pressure rod into the camshaft bore of the assembly equipment is equal to the set depth.

[0022] Figure 6 A schematic diagram showing the insertion depth of the pressure rod into the camshaft bore of the assembly equipment is greater than the set depth.

[0023] In the diagram: 1. Pressure rod; 2. Connector; 3. Positioning part; 4. Groove; 5. Movable block; 6. Insertion block; 7. Rotating block; 8. Ball bearing; 9. Shaft seat; 10. Movable rod; 101. First rod body; 102. Second rod body; 11. Roller; 12. Through hole; 13. Center rod; 14. Spring shaft; 15. Telescopic rod; 16. Connecting plate; 17. Elastic element; 18. Camshaft shaft hole. Detailed Implementation

[0024] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0025] Combination Figures 1-6 As shown, an assembly device for a marine diesel engine camshaft bushing includes a pressure rod 1. The front end of the pressure rod 1 has a connector 2. The connector 2 has a positioning part 3 for positioning the bushing oil hole when placing the bushing on the connector 2, ensuring that the bushing oil hole faces the designated direction of the pressure rod 1. The rear circumferential sidewall of the pressure rod 1 has several fixing components arranged radially. The fixing components can be 4, 6, or 8, etc. Each fixing component includes a groove 4 formed in the circumferential sidewall of the pressure rod 1, a movable block 5 disposed in the groove 4 and supported radially along the pressure rod 1 by an elastic element 17, and a rotating element arranged front to back on the outer side of the movable block 5. The rotating part and the limiting part, the movable block 5 can extend laterally outward from the groove 4 under the elastic action of the elastic member 17. When the movable block 5 extends out of the groove 4, the rotating part can contact the inner wall of the camshaft shaft hole when the depth of the pressure rod 1 inserted into the camshaft shaft hole is equal to the set depth (the set depth is determined by the position height of the rotating part and the limiting part on the pressure rod 1) and make the pressure rod 1 rotatable in the circumferential direction. That is, the rotating part provides the function of rotational support to ensure the stability of rotation. The limiting part is used to contact the inner wall of the camshaft shaft hole when the depth of the pressure rod 1 inserted into the camshaft shaft hole is greater than the set depth and to restrict the pressure rod 1 from rotating in the circumferential direction.

[0026] The equipment also includes an adjusting element for adjusting the orientation of the bushing oil hole to align the bushing oil hole with the camshaft inclined oil hole.

[0027] Preferably, the rotating part of the present invention includes an insertion block 6 and a rotating block 7. The distance between the outer side of the insertion block 6 and the axis of the pressure rod 1 gradually increases from front to back, which facilitates insertion into the camshaft hole. The distance between the outer side of the rotating block 7 and the axis of the pressure rod 1 is equal to the maximum distance between the outer side of the insertion block 6 and the axis of the pressure rod 1. Furthermore, ball bearings 8 are arranged on the outer surface of the rotating block 7, which can reduce friction through rolling contact. In addition, the outer surfaces of both the insertion block 6 and the rotating block 7 are arc surfaces, and the centers of the arc surfaces are located on the axis of the pressure rod 1.

[0028] Preferably, the limiting part in this invention includes a bearing seat 9 and a movable rod 10 rotatably disposed on the bearing seat 9. The bearing seat 9 is provided with a coil spring (not shown in the figure). The movable rod 10 is composed of a first rod body 101 and a second rod body 102 that are perpendicular to each other. Under the action of the coil spring, the first rod body 101 tends to extend radially outward along the pressure rod 1, and the second rod body 102 tends to extend axially forward along the pressure rod 1. A roller 11 with a rolling plane that coincides with the axis of the pressure rod 1 is provided on the second rod body 102.

[0029] The length of the first rod 101 satisfies the following condition: when the pressure rod 1 is inserted into the camshaft hole to a depth equal to the set depth, at least a portion of the first rod 101 contacts the end face of the camshaft hole; the length of the second rod 102 satisfies the following condition: when the pressure rod 1 is inserted into the camshaft hole to a depth greater than the set depth, and the first rod 101 rotates under the obstruction of the end face of the camshaft hole, the second rod 102 rotates synchronously and the distance between the outer side of the roller 11 and the axis of the pressure rod 1 is greater than the distance between the outer side of the rotating block 7 and the axis of the pressure rod 1.

[0030] Preferably, in this invention, the pressure rod 1 has a through hole 12 extending from front to back. The adjusting component includes a central rod 13, which is movably inserted into the through hole 12 and connected to the through hole 12 with a key. In this way, the central rod 13 can only slide along the axial direction of the through hole 12 and cannot rotate relative to the pressure rod 1. The end of the central rod 13 is connected to a telescopic rod 15 through a spring shaft 14. The radius of the telescopic rod 15 is smaller than that of the central rod 13, so it can pass smoothly through the through hole 12. Under the action of the spring shaft 14, the telescopic rod 15 tends to be perpendicular to the central rod 13 and faces the same direction as the positioning part 3. In this way, when the telescopic rod 15 is disengaged from the through hole 12, it will immediately rotate to a vertical state. The telescopic rod 15 consists of an outer sleeve rod and an inner sleeve rod that are movably connected to each other, as well as a spring located between the outer sleeve rod and the inner sleeve rod (the spring elasticity is relatively small compared to the spring shaft 14, so that when the end of the telescopic rod 15 touches the inner wall of the shaft hole during rotation, it will contract itself to ensure that it rotates to a vertical state). A ball bearing 8 is provided at the end of the telescopic rod 15, which can also reduce friction.

[0031] In addition, the positioning part 3 is existing technology, which includes a pressure plate disposed on the side of the connector 2, a columnar groove located inside the pressure plate, and a steel ball located in the columnar groove and supported by a spring. For the convenience of stamping, the rear end of the pressure rod 1 is also provided with a connecting plate 16 for connecting stamping equipment (such as a liquid oxygen cylinder).

[0032] The specific operating procedure of this assembly equipment is as follows: First, the bushing is fitted onto the connector 2 at the front end of the pressure rod 1, and the oil hole of the bushing is aligned with the positioning part 3. Then, the pressure rod 1 is inserted into the camshaft shaft hole 18 to be pressed. The insertion block 6 and the rotating block 7 on the pressure rod 1 will enter the camshaft shaft hole 18 in sequence. The movable block 5 automatically retracts to match the shaft hole size. When the pressure rod 1 is inserted to the set depth, the ball bearings 8 on the outer side of the rotating block 7 contact the inner wall of the camshaft shaft hole, and part of the first rod body 101 contacts the end face of the camshaft shaft hole 18, playing a certain stopping role. At this time, the state is as follows. Figure 5 As shown, the pressure rod 1 can rotate stably around its axis. Then, the center rod 13 is inserted into the through hole 12 until the front telescopic rod 15 extends out of the through hole 12 and rotates to a vertical position, with the telescopic rod 15 facing the same direction as the positioning part 3. Rotating the center rod 13 at this point will cause the pressure rod 1 and bushing to rotate synchronously. The ball bearing 8 at the end of the telescopic rod 15 will also roll along the inner wall of the camshaft hole 18. By adjusting the insertion depth and angle of the center rod 13, the telescopic rod 15 can be inserted into the inclined oil hole, at which point the bushing oil hole will be aligned with the inclined oil hole. Next, the pressure rod 1 is further inserted (overcoming the resistance of the coil spring on the bearing seat 9) until the insertion depth exceeds the set depth. At this point, the end face of the shaft hole will block the first rod body 101, causing the movable rod 10 to rotate and the second rod body 102 to gradually swing outwards, ultimately causing the roller 11 to roll into contact with the inner wall of the shaft hole. The state at this point is as follows. Figure 6 As shown, the pressure rod 1 will be unable to rotate under the restriction of the roller 11 (the surface of the roller 11 is made of friction material, and the sliding friction in the non-rolling direction is large under the extrusion contact state), thus achieving circumferential positioning; then the adjusting part is taken out, and a stamping device is connected to the rear end of the pressure rod 1 to stamp the pressure rod 1. During the stamping process, the pressure rod 1 will not rotate in the circumferential direction until the bushing reaches the designated position and is interference-fitted with the inner wall of the shaft hole, and the bushing oil hole is aligned with the inclined oil hole in the camshaft shaft hole, thereby completing the assembly of the diesel engine camshaft bushing.

[0033] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. An assembly apparatus for a marine diesel engine camshaft bushing, the apparatus comprising a pressure rod (1), the front end of the pressure rod (1) being provided with a connector (2), the connector (2) being provided with a positioning part (3) for positioning the bushing oil hole when placing the bushing on the connector (2), characterized in that, The rear circumferential sidewall of the pressure rod (1) is provided with a plurality of fixing components in a radial manner. The fixing components include a groove (4) opened in the circumferential sidewall of the pressure rod (1), a movable block (5) provided in the groove (4) and supported radially along the pressure rod (1) by an elastic element (17), and a rotating part and a limiting part arranged on the outer side of the movable block (5). The rotating part is used to contact the inner wall of the camshaft shaft hole when the pressure rod (1) is inserted into the camshaft shaft hole to a depth equal to a set depth, and to allow the pressure rod (1) to rotate in the circumferential direction. The limiting part is used to contact the inner wall of the camshaft shaft hole when the pressure rod (1) is inserted into the camshaft shaft hole to a depth greater than a set depth, and to restrict the pressure rod (1) from rotating in the circumferential direction. The equipment also includes an adjusting element for adjusting the orientation of the bushing oil hole to align the bushing oil hole with the camshaft inclined oil hole; The rotating part includes an insertion block (6) and a rotating block (7). The distance between the outer side of the insertion block (6) and the axis of the pressure rod (1) gradually increases from front to back. The distance between the outer side of the rotating block (7) and the axis of the pressure rod (1) is equal to the maximum distance between the outer side of the insertion block (6) and the axis of the pressure rod (1). Ball bearings (8) are arranged on the outer side of the rotating block (7). The limiting part includes a bearing seat (9) and a movable rod (10) rotatably mounted on the bearing seat (9). The bearing seat (9) is provided with a coil spring. The movable rod (10) is composed of a first rod body (101) and a second rod body (102) that are perpendicular to each other. Under the action of the coil spring, the first rod body (101) tends to extend outward radially along the pressure rod (1), and the second rod body (102) tends to extend forward axially along the pressure rod (1). A roller (11) with a rolling plane that coincides with the axis of the pressure rod (1) is provided on the second rod body (102). The pressure rod (1) has a through hole (12) that runs through the front and back. The adjusting component includes a central rod (13). The central rod (13) is movably inserted into the through hole (12) and is connected to the through hole (12) with a key. The end of the central rod (13) is connected to a telescopic rod (15) through a spring shaft (14). Under the action of the spring shaft (14), the telescopic rod (15) tends to be perpendicular to the central rod (13) and its orientation is the same as that of the positioning part (3).

2. The assembly equipment for a marine diesel engine camshaft bushing according to claim 1, characterized in that, The outer surfaces of the insertion block (6) and the rotating block (7) are both arc surfaces, and the centers of the arc surfaces are located on the axis of the pressure rod (1).

3. The assembly equipment for a marine diesel engine camshaft bushing according to claim 1, characterized in that, The length of the first rod (101) satisfies the following: when the depth of the pressure rod (1) inserted into the camshaft hole is equal to the set depth, at least part of the first rod (101) is in contact with the end face of the camshaft hole; the length of the second rod (102) satisfies the following: when the depth of the pressure rod (1) inserted into the camshaft hole is greater than the set depth, and the first rod (101) rotates under the obstruction of the end face of the camshaft hole, the second rod (102) rotates synchronously and the distance between the outer side of the roller (11) and the axis of the pressure rod (1) is greater than the distance between the outer side of the rotating block (7) and the axis of the pressure rod (1).

4. The assembly equipment for a marine diesel engine camshaft bushing according to claim 1, characterized in that, The telescopic rod (15) consists of an outer sleeve rod, an inner sleeve rod, and a spring located between the outer sleeve rod and the inner sleeve rod, and a ball bearing (8) is provided at the end of the telescopic rod (15).

5. The assembly equipment for a marine diesel engine camshaft bushing according to claim 1, characterized in that, The positioning part (3) includes a pressure plate disposed on the side of the connector (2), a columnar groove located inside the pressure plate, and a steel ball located in the columnar groove and supported by a spring.

6. The assembly equipment for a marine diesel engine camshaft bushing according to claim 1, characterized in that, The rear end of the pressure bar (1) is also provided with a connecting plate (16) for connecting the stamping equipment.

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