JP4079259B2 - Press-fitting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a press-fitting device for a press-fitting bush used for a rotary bearing such as a balancer shaft and a cam shaft.
[0002]
[Prior art]
For example, as disclosed in Japanese Patent Application Laid-Open No. 9-57555, a balancer shaft that cancels movement and static unbalance generated by rotation of a crankshaft of an engine is supported by a plurality of press-fit metal bushes, The bush is lubricated with lubricating oil supplied through an oil supply hole.
[0003]
There is also a method of fixing a bush that is divided into two halves with a bolt, but this technique relates to mounting of a press-fit metal bush that is relatively easy to mount and has a small number of parts.
[0004]
4 and 5 schematically show the configuration and press-fitting form of a conventional press-fit metal bush (hereinafter abbreviated as bush).
In FIG. 4, a bush 5A is press-fitted with an outer diameter interference fit into a pilot hole 6 for press-fitting a bush provided parallel to the axis of the engine block 10 (perpendicular to the paper surface in FIG. 4). An oil supply hole 12A drilled in the engine block 10 communicates with the oil hole 5a of the through hole provided in 5A.
[0005]
FIG. 5 shows a press-fitting device in which an oil supply hole 12A provided in the engine block 10 and an oil hole 5a provided in the bush 5A are matched.
The projection 30b provided on the outer diameter of the end of the cylindrical press-fit body 30A is engaged with the notch 5c provided on the bush 5A so as to be integrated with each other so that the circumferential phase alignment and the axial direction match the pilot hole 14 And press-fitting.
[0006]
Providing the notch 5c in the bush 5A causes a decrease in the amount of oil supplied due to a decrease in the pressure receiving area of the bush 5A or a seizure due to the generation of local frictional heat.
Also, in the manufacturing process of the bush 5A, burrs are easily generated at the edge portion of the notch portion 5c, and in addition to the processing cost of the notch portion 5c, man-hours and costs related to removal of the burrs are added.
[0007]
Japanese Patent Application Laid-Open No. 9-57555 discloses a technique for phasing oil holes on the left and right balance shaft bushes parallel to the crankshaft as an assembly device for bearing members. However, in this technique, the bush holding unit is configured to hold the bush and convey it to the delivery position with respect to the press-fitting means in a state where the pin is placed in the oil hole, so that the structure of the apparatus is large, complicated, and expensive.
[0008]
[Problems to be solved by the invention]
The present invention has been proposed in view of the above-described various problems of the prior art, and an object of the present invention is to provide a bush press-fitting device that eliminates the positioning notch provided in the bush.
[0009]
[Means for Solving the Problems]
According to the press-fitting device of the present invention, in the press-fitting device for press-fitting the press-fitting type metal bush that rotatably supports the shaft of the engine, the rod-like press-fitting body (30) with a hook is fixed to the fixing device (50), First and second air supply ports (G1) are respectively provided to supply air to the large-diameter portion (36) of the press-fit body (30) from the outer periphery inward in the radial direction to detect the bush press-fit state. , G2) having a first hole (42a) and a second hole (43a) drilled and connected to the opposite side of the fixing device (50) of the large diameter part (36) (32) ) Is formed to have substantially the same outer diameter as the shaft insertion hole (6) of the engine block (10), and is connected to the opposite side of the fixing device (50) of the first small diameter portion (32). The outer diameter of (31) is a bush having a through hole (5a) ( ) Inner diameter and is formed in substantially the same diameter of said second small diameter portion (31) is a third hole extending radially outward is provided, and that the third hole and the second small diameter portion ( 31) and the fourth hole formed in the cap (20) provided in the second small-diameter portion (31), and the third hole and the fourth hole are one hole. has a (22b), the cap (20) is fixed to the second small-diameter portion outside is formed in the same diameter as the second diameter portion (31) (31), wherein one hole ( The elastic means (26) is inserted into the bottom side of 22b), and the elastic ball (26) is preloaded so that the steel ball (28) is pushed outward in the radial direction, and is provided in the bush (5). The through hole (5a) is closed, and a small hole (43) extending radially outward in the second small diameter portion (31). ) And penetrates the second small diameter portion (31), the first small diameter portion (32), and the large diameter portion (36), and communicates the small hole (43c) and the second hole (43a). Hole (43b) is provided, and the first hole (42a) is formed in a third hole provided outwardly in the radial direction of the second small diameter portion (31) through the hole (42b). The second hole (43a) ejects air toward the inner diameter of the bush (5) through the hole (43b) and the small hole (43c). A gap switch (Sg) for measuring the degree of valve opening of the steel ball (28) is connected to the air supply port (G1), and the thickness of the bush and the presence or absence of the bush are measured at the second air supply port (G2). A gap switch (Sg) to be detected is connected.
[0010]
The elastic means is preferably a coil spring, but may be a rubber or a fluid spring. With such a configuration of the present invention, the through hole of the bush serving as the lubricating oil supply hole is secured at an appropriate position and communicated with the oil supply line provided in the engine block.
[0012]
Thus, since the steel ball becomes a valve body and closes the through hole so as not to allow ventilation, it can be easily determined that the bush is in an appropriate position.
[0014]
In the implementation of the present invention, when the bush is not in the proper position, the steel ball as the valve body is configured not to be seated on the valve seat provided on the cap.
[0016]
As described above, when the bushing is forgotten to be mounted, the air supplied from the second air supply port is discharged to the outside of the press-fitting device indefinitely and can be easily detected.
[0018]
Such fitting of the steel ball into the bush through hole allows the operator to confirm that the bush is in an appropriate position by giving a feeling of moderation, and to perform an operation without error.
[0020]
When carrying out the present invention, specifically, the steel ball is seated on the valve seat provided at the tip of the hole of the cap together with the fitting of the steel ball into the through hole, and is closed.
[0022]
If the bushing is not in the proper position and the steel ball does not block the through hole, the air micro gap switch provided upstream of the first air supply port detects the amount of air leakage and provides an insufficient blockage. It can be used as position correction data.
[0024]
Thus, when the bush is not press-fitted, it is possible to detect forgetting to install the bush by the leakage of the air supplied from the second air supply port.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 3 with reference to the accompanying drawings. In addition, the code | symbol and name which were used in FIG. 4, 5 of prior art description overlap and use the same code | symbol and name about the same form.
[0026]
1 shows a side cross section of a main configuration of a press-fitting device 3 according to the present invention limited to the vicinity of a large-diameter bush 5 serving as a main part for explanation, and FIG. 2 shows an AA non-linear cut cross section of FIG. FIG. 3 shows a local enlarged view of FIG.
[0027]
The press-fitting device 3 includes a rod-like press-fitting body 30 with a flange and two gap switches Sg attached to the press-fitting body 30.
[0028]
The press-fit body 30 is in contact with the flange-shaped large-diameter portion 36 that is fixed to the fixing device 50 that fixes the press-fit body 30 by a plurality of bolts 36 </ b> B, the medium-diameter portion 34 that contacts the large-diameter portion 36, and the medium-diameter portion 34. The first small-diameter portion 32, the second small-diameter portion 31 in contact with the first small-diameter portion 32, and the third small-diameter portion 29 in contact with the second small-diameter portion 31 are integrally formed.
[0029]
The through hole 45 formed inside the press-fit body 30 is for mounting a small-diameter bush (not shown) that supports the balancer shaft in a pair with the large-diameter bush 5.
[0030]
The large-diameter portion 36 is formed with a fitting portion 37 to be fitted to the fixing device 50, and a first press for detecting a bush press-fit state to be described later from the outer periphery of the large-diameter portion 36 inward in the radial direction. The hole 42a and the second hole 43a are perforated, and the first and second air supply ports G1 and G2 are attached to each of them.
[0031]
In the present embodiment, the intermediate diameter portion 34 is formed with a contact surface 34a with the end surface Fw which is the work front surface of the engine block 10.
[0032]
The first small-diameter portion 32 is formed with the same outer diameter as the pilot hole of the bush 5 to be press-fitted, that is, the shaft insertion hole 6, and the end portion is formed with a contact surface 32 a that contacts the end portion of the bush 5.
The outer diameter of the second small diameter portion 31 has a fitting surface 31a and is formed to be substantially the same diameter as the inner diameter of the bush 5, and the third small diameter portion 29 is formed for mounting a small diameter bush (not shown).
[0033]
With reference to FIG. 3, a hole 22 b extending radially outward is provided in the second small diameter portion 31, and the outer end portion of the hole 22 b is formed in the valve hole 21 having a slightly reduced diameter, thereby providing a valve seat function. Have.
[0034]
The hole 22b is formed as a single hole 22b through communication between the portion formed in the small diameter portion 31 and the hole 22b formed in the cap 20.
[0035]
The cap 20 is formed in an arcuate shape in which the outside is the same diameter as the second small diameter portion 31, and the bottom surface of the large end portion 22 is in close contact with the inside of the second small diameter portion 31. The contact surface 22 a is fixed to the second small diameter portion 31 by four embedded bolts 23. An airtight O-ring 25 is attached to the contact surface 22a.
[0036]
A coil spring 26 as elastic means is inserted and arranged on the bottom side of the hole 22b, and a steel ball 28 as a valve body is inserted into the end of the coil spring 26 so as to be pushed outward in the radial direction. The elastic means may be a rubber material or a fluid spring such as a gas spring or a liquid spring.
[0037]
The steel ball 28 is formed in such a size as to be seated in close contact with the valve hole 21 at the time of maximum protrusion and to enter the through hole 5a at the stage of reaching the maximum protrusion.
[0038]
A hole 42b is provided in the vicinity of the bottom of the hole 22b in parallel to the axis, and communicates with the first hole 42a. The end of the hole 42b is closed by a plug 37a.
[0039]
A small hole 43c is perforated radially inward at the end of the second small diameter part 31 on the first small diameter part 32 side, and the inner end of the small hole 43c passes through the hole 43b provided parallel to the axis. The second hole 43a communicates with the second hole 43a. The end of the hole 43b is closed by a plug 37a.
[0040]
Gap switch Sg that measures and detects the thickness of the bush and the presence or absence of the bush at the second air supply port G2 so that the gap switch Sg that measures the valve closing degree of the steel ball 28 is connected to the first air supply port G1. Are to be connected.
[0041]
A commercially available product (for example, model: HPS-10-PGC-GW2, trade name “contact check switch” manufactured by CKD Corporation) can be applied to the gap switch Sg.
[0042]
A procedure for press-fitting the bush 5 that rotatably supports the balancer shaft into the engine block 10 using the press-fitting device 3 having the above-described configuration will be described with reference to FIGS.
[0043]
First, the gap switch Sg is connected to each of the first and second air supply ports G1 and G2 of the press-fitting device 3 fixed to the fixing device 50, and air is supplied from the first and second holes 42a and 43a.
[0044]
Next, the bush 5 is inserted into the second small-diameter portion 31 and attached to the contact surface 32a (step of attaching the bush to the press-fitting device).
[0045]
Next, the third small diameter portion 29, the second small diameter portion 31, and the first small diameter portion 32 of the press-fitting device 3 are inserted into the shaft insertion hole 6 (step of inserting the press-fitting device into the shaft insertion hole).
[0046]
Next, the bush 5 is positioned so as to be mounted at an appropriate position of the shaft insertion hole 6.
At the time of positioning the bush 5, proper confirmation of the axial position and the circumferential position, a difference in specifications, or forgetting to install the bush are detected as follows.
[0047]
When the bush 5 is not in the proper position, the steel ball 28 is within the inner diameter of the bush 5 and the operator does not feel a sense of moderation. At this time, the flow of the air supplied from the first hole 42a is not stopped.
[0048]
Further, even if the steel ball 28 enters the through hole 5a of the oil hole and feels moderation, if the steel ball 28 is not in a perfect proper position, the air supplied from the first hole 42a is supplied to the steel ball 28 and the valve hole 21. The gap switch Sg detects that there is a gap through the gap (gap).
[0049]
When the bush 5 is in the proper position, the steel ball 28 is inserted into the through hole of the bush 5 so that the operator feels moderation, and the steel ball 28 is seated in the valve hole 21 to stop the flow of air, and the gap It is detected that there is no gap.
[0050]
In the case of specifications with different specifications, for example, with different bush widths, the position of the through hole 50a is different.
[0051]
Forgetting to install the bush, the air supplied from the second hole 43a is ejected from the small hole 43c toward the inner diameter of the bush 5 through the hole 43. However, since air flows without resistance, it is detected that the bush 5 is not present. The
[0052]
Moreover, in the thickness difference specification of the bush 5, it detects with the gap switch Sg so that the air flow may differ from a predetermined value.
[0053]
As described above, the operator's mistake can be prevented and the through hole 5a, which is the oil supply hole of the bush 5, can be matched with the oil supply hole of the engine block.
[0054]
Similarly, for example, the press-fitting of the bush of the camshaft is the same, and the present invention can be applied to devices and members that require a press-fitting of a bush having an oil hole in addition to the engine block.
[0055]
It should be noted that the illustrated embodiment is merely an example, and is not a description to limit the technical scope of the present invention.
[0056]
【The invention's effect】
The effects of the present invention are listed below.
(1) When the steel ball in the cap provided in the press-fitting device coincides with the through hole which is the oil hole of the bush, the steel ball is configured to be fitted into the through hole by the elastic means. Is guaranteed.
(2) Since the steel ball has a modest feeling of resistance when the steel ball is inserted into the through hole, an operator's mistake can be prevented.
(3) Since the gap switch Sg is connected to the first air supply port and it is determined whether or not the steel ball is fitted in the through hole and is in the proper position, the proper position can be completely guaranteed.
(4) When a bush with a different specification is press-fitted as described above, an appropriate position cannot be found, so that the specification difference of the bush can be easily detected.
(5) A gap switch is connected to the second air supply port so that the presence or absence of the bush and the thickness of the bush can be detected. Also, it is possible to detect a difference in thickness specifications.
(6) Since the proper position of the bush is detected by the air flow in this configuration, it can be suitably used when an electrical sensor cannot be used due to environmental and space problems.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing an embodiment of a press-fitting device of the present invention.
FIG. 2 is a cross-sectional view taken along the line AA in FIG.
FIG. 3 is a local enlarged view of FIG. 1;
FIG. 4 is an explanatory diagram of a conventional press-fitting device.
FIG. 5 is a view showing the bush press-fitting device.
[Explanation of symbols]
G1 ... first air supply port G2 ... second air supply port Sg ... gap switch 3 ... press-fitting device 5 ... bush 5a ... through hole (oil supply hole)
6. Shaft insertion hole (bush pilot hole)
DESCRIPTION OF SYMBOLS 10 ... Engine block 20 ... Cap 21 ... Valve hole 22 ... Cap large end part 22b ... Hole 23 ... Set bolt 25 ... O-ring 26 ... Spring 28 ... · Steel ball 30 ··· Press-fit body 42a · · First hole 43a · · · Second hole 50 · · · Fixing device

Claims (1)

In a press-fitting device for press-fitting a press-fitted metal bush that rotatably supports an engine shaft, a rod-like press-fitted body (30) with a hook is fixed to a fixing device (50), and the large diameter of the press-fitted body (30) A first hole having first and second air supply ports (G1, G2) for supplying air to the portion (36) radially inward from the outer periphery thereof and detecting the bush press-fit state, respectively. (42a) and the second hole (43a) are perforated, and the first small diameter portion (32) connected to the opposite side of the fixing device (50) of the large diameter portion (36) is the shaft of the engine block (10). The outer diameter of the second small-diameter portion (31) that is formed to have substantially the same outer diameter as the insertion hole (6) and is connected to the opposite side of the fixing device (50) of the first small-diameter portion (32) is a through hole. Formed approximately the same diameter as the inner diameter of the bush (5) having (5a) Is, the third hole is provided extending in a second radially outward to the small diameter portion (31), and its third hole portion formed in the second small diameter portion (31) first The third hole and the fourth hole are one hole (22b) in communication with the fourth hole formed in the cap (20) provided in the small-diameter portion (31) of the two, The cap (20) has the same outer diameter as the second small diameter part (31) and is fixed to the second small diameter part (31), and elastic means (on the bottom side of the one hole (22b)) 26) is inserted, and the elastic ball (26) is preloaded so that the steel ball (28) is pushed outward in the radial direction so as to close the through hole (5a) provided in the bush (5). The second small diameter portion (31) is provided with a small hole (43c) extending radially outward, and the second small diameter portion (31) is provided with the second small diameter portion (31). A hole (43b) is provided through the diameter portion (31), the first small diameter portion (32), and the large diameter portion (36) to communicate the small hole (43c) and the second hole (43a). The first hole (42a) communicates with a third hole provided outwardly in the radial direction of the second small diameter portion (31) via the hole (42b). The hole (43a) ejects air toward the inner diameter of the bush (5) through the hole (43b) and the small hole (43c), and is supplied to the first air supply port (G1). A gap switch (Sg) for measuring the valve opening degree of the steel ball (28) is connected, and a gap switch (Sg) for measuring and detecting the bush thickness and the presence / absence of the bush is connected to the second air supply port (G2). A press-fitting device characterized by being connected.

Images