JPS60501199A - Collective removal of engine cylinder liners, pistons, and rods - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention removes cylinder liners, pistons, rings, and rods from an engine. With respect to removal, in particular the present invention provides for the removal of such engine elements as a unit. related to how to

Related application inquiries This application is filed by Louis F. Vachon on May 2, 1983. This is a partial continuation of National Patent Application No. 490,942.

Background technology Internal combustion engines typically utilize a cylinder liner that defines the bore in which the piston moves back and forth. I am using it. During engine operation, the combustion process involves the movement of the piston within the liner. This results in carbon deposition or stepped wear near the top of the moving point. This species exists or other types of wear typically require replacement of the cylinder liner and piston after a period of time. make it necessary.

However, liner removal is complicated due to the tight fit between the liner and block. be. This tight fit is achieved, for example, by an O-ring around the liner; It also generally increases with high temperatures and other conditions of engine use. Conventional , liners without air inlet ports are usually adjusted to grip the end face of the liner. It was removed by inserting a tool into the bore. And Raina is Block by applying sufficient force to the tool to overcome even tight fits. be raised from.

The disadvantage of this operation is that the piston must first be assembled so that the tool is inserted into the liner. Remove the cylinder liner by passing through the top of the cylinder liner. These individual processes This is especially important in areas where carbon adhesion or stepped wear is significant. It is inconvenient, time consuming, and requires polishing to be able to slide. Okay, first we have to remove the piston from the bore.

In a two-cycle engine where the liner has an inlet port, the liner has two ends. It is known to insert a tool with a rod into the liner. Each end has a liner 71 on the other side? - the engine is placed on the liner to displace the liner. The piston attached to the rod is rotated to bias it against the rod.

This approach is described in U.S. Pat. No. 3, issued to Webb on April 23, 1974. , No. 805, 359. Gurtskover on March 23, 1976 No. 3,945,104 issued to Other methods that are movable, such as striking the anvil and loosening the liner, Showing tools. However, this type of removal method only removes the piston and rod. Requires a separate process to remove.

The present invention aims to overcome one or more of the above problems.

Disclosure of invention In one aspect of the invention, the cylinder unit, piston, ring and rod are A method is used to remove the head as a unit from the ennon block. . The method involves inserting a tool into the bore of the liner and expanding the tool against the liner. and creating frictional contact between the tool and the liner. this method The tool also applies force to the tool and works with the liner against the engine block. moving the tool, creating at least an incomplete negative pressure in the second liner of the piston. the liner along with the piston, rings, and rod as a unit. Including removal with a tumbler.

In other features of the invention, the method includes installing a driver and a center in the bore of the cylinder liner. Inserting the tool with the rod, moving the piston, and the driver Involves pushing into the hole in the mandrel. This method further explains how to move the piston onto the mandrel. radially forcing the mandrel as the driver is forced into the mandrel. The tool can be enlarged in the direction of frictional engagement with the liner, and the tool can be engineered with the liner. This includes moving relative to the main block. At least incomplete negative pressure is present on the piston occurs in the liner above the pistons, rings, and rods assembled The liner is removed as a unit.

In still other features of the invention, the cylinder liner is removed from the engine block. The tool for this purpose has a mandrel and a driver. The driver can be inserted into the hole in the mandrel. be. to move the driver to a preselected first position within the mandrel hole; Means are provided for applying force to the driver.

Cylinder liners, pistons, and other assembled elements can be removed as a unit. to facilitate repair work on Ennon. By removing it as a unit, the First removing the piston through the liner and then removing the liner from the block. Other methods, including inserting a tool to grasp the underside of the liner for pulling The process becomes unnecessary.

Brief description of the drawing FIG. 1 shows a part of an engine and an engine for carrying out an embodiment of the method of the invention. Tool 5 in position diagram, FIG. 2 is similar to FIG. 1 but shows intermediate steps in the disclosed method; FIG. 3 shows details of the tool shown in FIG. 1 used to carry out the method of the invention. Figure, FIG. 4 is a cross-sectional view of a part of the tool in FIG. 3 along line IV-IV in FIG. 3; FIG. 5 is a diagram of one embodiment of the invention showing the tools used to carry out the method of the invention; , and FIG. 6 is a partially sectional side view of the tool of FIG. 5. Referring to FIG. A portion of an internal combustion engine 10 is shown illustrating the engine's "cylinders." here If we ignore the tool 12, the engine has a block 14 with an opening in this block. A cylinder liner 6 forming a cylinder bore is disposed therein. cylinder dryer The outer surface 19 of the hole is designed to fit into the hole of the block on a "pilot" basis. having an O-ring 20 disposed in a groove in the lower part of its outer surface; . When the liner is fitted to the block, the O-ring fits tightly against the lower step 24 of the block. and then mate.

A piston 26 has a top surface 27 and a ring 28 retained in a groove in the outer surface. , located in the cylinder bore 18. The piston has a conventional hand configuration including a wrist pin 34. It is swingably connected to the p-rod 32 by the stage. Use rod cap 38 for the rod. Due to this, it is connected to the crankshaft 37. Engine head (show ) is provided on the upper surface 35 of the block 14. The structure of such an engine and The operation is well known from the prior art and will not be described in detail.

With particular reference to FIGS. 3 and 4, the interfabricated and operable connection a cylinder liner, a piston with one or more rings, and a rod. An example of a tool 12 used to disassemble the board is shown. This tool is for liner Even if carbon is attached to 16 or stepped wear is formed, the It is diametrically adjustable so that it can be inserted into the bore 18. The tool is the machine. For forming chucks to hold workpieces during machining processes. A single taper collet with slot 42, as is often used. The two segments 40 shown are collapsed. The segment is designated by reference numeral 44. A slot filled or sealed with an elastomeric or plastic material. Constructed of metal, with a The two tapered mandrels 46 are connected to the segments 40 It can be fitted into the opening 47 with a chi A inside. These mandrels are made of metal, each mandrel A hole is shaped to receive a key to fit into the slot in each segment. will be accomplished.

Bolts 48 are positionable through openings in the segments and mandrels. one of the core one is drilled in the opposite direction to receive the head of the bolt (see Figures 1 and 2). (See Figure 2). The bolt also fits within the spacer 50 and oversized washer 52. is provided through an opening in the hole and is screwed into a nut 54 at one end.

When the tool is assembled and the nut is turned against the bolt, the tapered mandrel It is understood that the segment is pushed further into the perforated opening to expand the segment radially. be done.

The tools 12 in FIGS. 3 and 4 are similar to those in FIGS. 1 and 2, as described below. cylinder liner 6, piston 26, and ring 28 assembled in working condition. , and the rod 32 are disassembled from the ennon 10. The figure is shown to explain that.

Another embodiment of tool 12 is shown in FIGS. 5 and 6. This tool is for the circumferential wall 62 It has a mandrel 60 with a. The circumferential wall 62 has an outer circumferential surface 64 forming the diameter of the mandrel; an inner circumferential surface 66 that is at least partially tapered and defines a hole 68; Ru. The holes 68 are shown open at the first and second ends 69.70 of the mandrel. Ru. The mandrel also has a plurality of slots 72 dividing the circumferential wall into segments 74. , the radial expansion of the mandrel tends to occur in response to the force applied to the inner peripheral surface. There is. The slots are preferably arranged symmetrically and extend substantially the length of the mandrel. As a result, the expansion is essentially uniform. The core is 1, Bokushi or an outer circumferential surface covered by a flexible cover 76, preferably made of an elastomer. and a curved second end. The cap 78, which has a hole 80 therethrough, also has a mandrel. is positionable with respect to the second end of the.

The tool 12 further includes a driver 82 that connects the base 84 and the guide. The body portion 86 has a wall 88. The tapered wall extends from the base and has a truncated conical shape. form. +IP portion can be inserted into hole 68 from first end 69 of mandrel 60 It is. The driver has an at least partially threaded hole 90. . The base of the driver is connected to the first end 69 of the mandrel when the body portion is placed within the mandrel. extends through.

When the driver is inserted into the mandrel 60, the body portion 86 biases the inner peripheral surface 66. Move the driver to a predetermined position in the hole 68 that facilitates enlarging the diameter of the mandrel. In order to move the driver 86, a force of 9 is applied to the driver 86. Means 94 are provided for applying. This means includes a nut 98 and a threaded portion 100. including a threaded rod 96 with a threaded portion that gradually threads the nut against the cap. By tightening the screwdriver, the driver will be pulled into place on the mandrel. It engages with the threaded portion of the hole 90 in the bar. The Chi-G wall of the body has sufficient force as a driver. Since it slides along the chi-guha circumferential surface 66 that forms the extra large size given to the It can be seen that the body part is movable to a further position within the hole. each digit Place the body part Chi 1? The walls form the inner diameter of the mandrel. A strong force is applied to the circumferential surface.

A tool 12 as shown is inserted into the cylinder bore 18 and is inserted into the cylinder liner. -6 is enlarged against the inner wall (Fig. 1). Enlarged to show cylinder liner and tools There is a friction fit, that is, sliding contact between the outer circumferential surface of the For example, the construction in Figures 3 and 4 If the tool is attached to the bolt 48, the tool must have a force greater than the liner's mating force within the bore 18. and the liner. The tool in Figure 5 is the sword, Natsuto 98. This operation can be facilitated by adjusting the Features of the illustrated tool include: Uniform diameter expansion and metal-to-rubber composition substantially reduce liner damage. Ru. The force is continuously applied to the tool in the longitudinal or axial direction relative to the liner. Ru. Because the tool is a friction fit against the liner, sufficient force is applied to the tool to create a tight fit. The first interference is “released” and the liner is It moves together with the tool from its position in the engine block 14 (FIG. 2). However, la Ina can be removed from the block.

Sufficient force for removal is applied by moving piston 26 within bore 18. 1 by engaging and biasing the piston against the bottom of the tool. Granted. The piston is, for example, a crankshaft 3 equipped with an engine rotating member. 7, this engine rotating member is almost the same as the engine starter pinion. Engage the flywheel in the same way. The force acting on the tool 12 is also by positioning them at a distance across the top of the tool. It may also be applied to the top of any of the tools described above. Bars can be blocks, e.g. 14 may be supported by a spacer that locks onto the top surface 35 of 14. Figure 3 construction In the tool, the rod is attached to the tool at one end and threaded into the nut at the other end. and pass through the hole in the bar. The nut is adjusted by acting against the bar, and the lock to apply lifting force to the tool. In the tool shown in Figure 5, the threaded rod 96 passes through the bar. additional nut 1 is tightened onto cap 78 and nut 98 is adjusted to provide a lifting force. Hold the threaded portion in place in the screwdriver during the process. Also, other devices may be used. It's okay to be hit.

The tool 12 of FIGS. 5 and 6 also utilizes the movement of the piston 26 for removal purposes. The unit 58 is removed by applying a force for increasing the size of the tool and a force for expanding the tool. make it easier to At the beginning, the mandrel 60 has a piston against the driver. with sufficient force to resist the tendency of the mandrel to slide within the liner during the first movement. , need only be held against movement within the cylinder liner 16. . This force can be applied, for example, to the mandrel against the liner using a threaded rod 96 and nut 98. by expanding radially to create a preselected frictional engagement. It will be done. The piston then moves further, moving the driver progressively further into the mandrel. The mandrel expands radially to create a friction grip that retains the tool within the liner. Increase friction force. At the same time, until the liner loosely releases within the bore 18, Increasing forces are applied to the tool in the direction of piston movement. Above eyes For purposes of this invention, the relative geometry and other geometries of the mandrel and driver will be known to those skilled in the art. More can be obtained.

Typically, the base 84 on which the piston is biased can be used to spread out the applied force. It should be made thicker.

For the illustrated engine 10, there are m pistons 26 or force-applying devices. The movement of tool 12 and liner 16 by It just needs to be sufficient. In other engine configurations, tools and Due to the close N nature of the liner and engine block 14, the liner can move more. It may be necessary or desirable.

At least the incomplete negative pressure is caused by the liner 16 above the top surface 27 of the piston 26. is applied to hold unit 58 intact during removal. The tool 12 is a tool and a pin. As an airtight cover, it eliminates the negative pressure generated in the liner between stones. used during Examples and 1. Therefore, it is difficult to enlarge the illustrated tool; Establish an air-tight contact between the cylinders and facilitate the formation of negative pressure. Tools change and change. Other systems have a cap placed on top of the liner to act as a tight cover. May be removed for use in Linda or Ennon. The gap is an example For example, a plastic plug that easily fits into the bore 18 and is attached to the inner circumferential surface of the liner. It may also be something that is “sealed” against the user. Negative pressure is created between the bung and the piston.

13 Experience shows that the conditions for generating sufficient negative pressure are as follows: Before raising, make sure the piston 26 is in contact with or close to the tool 12 or cap. (See Figure 2).

Negative pressure is applied when the liner is connected to the piston, ring 28, and unsupported connecting rod 32. This occurs because the pistons tend to move downward when both are lifted.

The disclosed method may be performed with additional steps, and the order of steps may vary. , changes may be made as apparent from what has been described herein without departing from the invention. It's okay to be hit.

Industrial applicability It is abundantly clear from the foregoing that the unit 58 is removed from the engine block 14. It seems to be easy. However, the benefits of repairing the engine in the disclosed manner I will briefly explain the point so that it can be fully understood.

First, remove the head of Ennon 10, rotate the crankshaft 37, and The stone 26 is positioned at a predetermined displacement point within the cylinder bore 18, and the tool positioning and It is desirable and necessary to facilitate completeness of the removal process. The tool 12 is , carefully placed in the bore to avoid carbon build-up or step wear. is inserted far enough.

Experience will tell you the desired initial position of the piston for your particular engine and tool. . When lifting the liner from the block, the piston is attached to tool 12, if the cap is used. When the cap is closed, it should be close to or in contact with the cap to facilitate the generation of negative pressure. It is suggested that the piston is located at. The piston 26 connects the tool 12 and the When used to move the piston 16, its initial position is such that the piston is attached to the tool. Preferably, they are on an upward stroke so that they are in close proximity or touch each other. This means that phosphorus The air retained by the tool in the bore 18 to leak through the piston minimize resistance to movement. One way to make it work better is to Insert the tool into the cylinder bore 18 and lock it to the piston.

In the case of the tool shown in Fig. 3, the bottom segment) 40 engages with the piston, while in Fig. In the case of the tool, the base 84 of the driver 82 locks onto the piston. This allows the Prior to radially expanding the tool, the piston and tool are moved into position. Simply rotate the crankshaft 34 to , enlarging the tool that contacts the piston to facilitate the removal process.

Tool 12 may be "enlarged" to obtain a friction fit.

Use of an additional "seal" ensures that the tool is fully utilized during the entire removal process. Somehow, I kept it airtight 5 Mating is obtained at the same time. However, due to sufficient negative pressure, the bolt in the tool shown in Fig. Using an O-ring on the head of the 48, or other means to prevent airflow along the bolt. measures may be necessary. Note that the bolt head fits into the hole in the mandrel 46. 9, the piston is less likely to be damaged by the bolt head 26. However, the single bolt is prevented from moving during tool expansion. Also, the mandrel 48 is connected to each segment. By being keyed to the ment 40, relative movement between them is prevented.

In the tool of FIG. 5, an elastomeric cover 76 provides a seal for obtaining negative pressure. function is performed.

Cylinder liner 16 is then removed and sufficient force is applied to tool 12 as previously described. The mating relationship is canceled only by adding . If necessary, the tool can then be removed. It is used to remove the next liner in the engine with the piston in place. It will be done. The cap is released to obtain negative pressure to complete the removal process liner. Alternatively, the tool is held in place. Next, The head cap 38 is removed and any liner or tool present is grasped. , the liner is pulled from the book 14. For example, as shown with the tool in FIG. The larger washer 52 or the eye of the tool in Figure 5 is used for lifting purposes. Suitable locations to connect tools used in overhead equipment, if necessary. . Due to the incomplete vacuum, the piston 26, ring 28, and rod 32 are engine with liner to be removed as unit 58 without being Freed from 10 and moved.

Other features, objects and advantages may be found in the specification, drawings and appended claims. It becomes clear by reading.

Claims (1)

[Claims] 1. Cylinder liner (16) and piston assembled to this liner (16) (26), ring (28), and rod (32) to the engine block (1). 4) as a unit) (58), the bolt of the liner (16) Insert the tool (12) into the a (18), The tool (12) is enlarged relative to the liner (16) and the tool (12) ) and the liner (16), A force is applied to the tool (12), and the lever is applied to the engine block (14). moving the tool (12) together with the inlet (16); at least a partial negative pressure in the liner (16) above the piston (26); together with the piston (26), ring (28), and rod (32). The liner (16) is attached to the engine block (14) as a unit (58). How to remove the card. 2 Step of inserting the tool (12) into the piston (26) and the tool (12) 2. A method according to claim 1, wherein the step of enlarging and enlarging is brought into contact with each other. 3. The step of applying force to the tool (12) causes the piston ( moving the piston (26) against the tool (12); 2. A method as claimed in claim 1, including energizing). 4. Rotate the crankshaft (37) within the engine block (14). Particularly, said piston (26) is moved within said tool (18) and said tool The method according to claim 3, in which the force is applied against (12). 5 The step of enlarging the tool (12) is the step of enlarging the tool (12) and the liner (1 6) The method according to claim 1, comprising bringing the material into airtight contact with the material. 6 Cylinder liner (16) and the piston assembled to this liner (16) 26), ring (28), and rod (32) to the engine block (14). ) from the liner (16) as a unit) (58), the bore of the liner (16) Insert the tool (12) into (18), The tool (12) is enlarged with respect to the liner (16) and the tool ( 12) and the liner (16), 19 at least a partial negative pressure in the liner (16) above the piston (26); generate force, apply force to the tool (12), and apply force to the engine block (14). and move the liner (16) and the joint tool (12), The above-mentioned piston (26), ring (28), and rod (32) together with the above-mentioned light (16) is removed from the engine block (14) as a unit (5B). Ru, How to remove cylinder liners, pistons, rings, and rods. 7. Cylinder liner (16) and piston assembled to this liner (16) (26), ring (28), and rod (32) to the engine block (1). 4) as a unit) (58), the bolt of the liner (16) Insert the tool (12) having the mandrel (60) and the driver (82) into the a (18). death, The piston (26) is moved within the bore (18) against the driver (82). and gradually push the driver (82) into the hole (68) of the mandrel (60), At the same time, a force is applied to the mandrel in the direction of movement of the piston, and the driver (82) The mandrel (60) is expanded in the radial direction as it is pushed into the mandrel (60). and frictionally engage the liner (16), and compare it with the engine block (14). moving the tool (12) into frictional engagement with the liner (16); Generating at least an incomplete negative pressure in the liner (16) above the piston (26) let me, The above-mentioned piston (26), ring (28), and rod (32) together with the above-mentioned light Na (16) is removed from the Ennon block (14) as a unit (58). Ru, cylinder liner, piston, rings, and mouth. How to remove the card. 8. The step of inserting the tool (12) is on the driver (82) and near it. located next to the piston (26) together with the centering rod (60), the driver 8. The method of claim 7 including locking the base (84) of (82). 9 The step of expanding the mandrel (60) in the radial direction is the step of expanding the mandrel (60) in the radial direction. 8. The method according to claim 7, which comprises contacting in an airtight manner. −10 When starting the process of moving the piston (26), the inside of the liner (16) Claim 1, comprising the step of initially holding said mandrel (60) against movement. The method described in scope item 7. 11. The step of holding the mandrel (60) against movement includes the step of holding the mandrel (60) to expand in the direction and bring into preselected frictional engagement with the above-mentioned hole (16). 11. The method of claim 10, comprising: 12 The cylinder is removed from the engine block (14) according to the force applied to the tool (12). To remove the cylinder liner (16), insert it into the cylinder liner (16) and grind it. A tool (12) for frictionally engaging the circumferential wall (62), the first and second ends (6 9° 70) and a mandrel (60) having a plurality of slots (72), the upper The circumferential wall (62) has an outer circumferential surface (64) that defines the diameter of the mandrel (60), and the first A hole (68) that opens at the end (69) is defined and the slot (72) is defined. A core having a tapered inner circumferential surface (16) thus divided into segments (74). A rod (60) and a base (84), a body (86), and a hole (90) extending therethrough; a driver (82) having a body portion (86 of which is the base portion (84); It has a tapered wall (88) extending from the hole and can be inserted into the hole (68). A larger diameter is defined to correspond to the tapered inner circumferential surface (66) of the mandrel (60). The tapered wall (88) gradually increases in strength with respect to the outer circumferential surface (64). The base (84) is movable to a position to be biased, and the base (84) is connected to the driver (82). ) is inserted into the mandrel (60), the first end - (69) of said mandrel (60) a driver (82) extending through; having a penetrating hole (80) and disposed at the second end (70) of the mandrel (60); a gap (78) that can be placed; The driver ( means (94) for applying a force to said driver (82,) in order to move said driver (82,); and the hole (68) and the holes (80, 90) in the cap (78). means (94) including a deployable threaded rod (96) and a driver (82); A tool equipped with. 13 The hole (90) of the driver (82) is threaded, and the threaded rod (96) is engageable in the hole (90) and in the cap (78). Claim 12, comprising a threaded portion (100) including an engaging nut (98). Tools included. 14 The outer peripheral surface (64) of the circumferential wall (62) and the second end (7) of the mandrel (60) 13. The device according to claim 12, comprising a flexible cover (76) located at Ingredients. 1