JPH04113262U - Pivot shaft structure in vehicle wiper device - Google Patents

Abstract

(57) [Summary] [Purpose] A sleeve integrally attached to the vehicle body side,
To allow lubricating oil to spread over substantially the entire sliding surface of a pivot shaft rotatably supported around an axis inside the cylinder of the sleeve, and to simplify machining of the outer circumferential surface of the pivot shaft. [Structure] On the outer circumferential surface of the long shaft portion 1a of the pivot shaft 1, a long groove 1e extending approximately the entire length of the long shaft portion 1a with one end open and the other end closed is formed in the axial direction of the pivot shaft 1. A suitable number of stripes were formed in the direction toward the groove 1e, and the lubricant 8 was filled in the groove 1e.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is a pivot point in wiper devices for vehicles such as private cars, buses, and trucks. This concerns the shaft structure.

0002

[Prior art and problems to be solved by the invention]

Generally, a wiper arm is fixed at the distal end and a link arm is fixed at the proximal end. The pivot shaft (wiper shaft) is a slide whose long shaft is integrally attached to the vehicle body. It is rotatably supported on the shaft, and pivots when the wiper motor is driven. The wiper arm swings back and forth as the wiper arm rotates around the axis, wiping the glass surface. It is structured like this.

0003 By the way, such a pivot shaft has a cylindrical long part in the middle inside the sleeve. Since it slides around the axis on the peripheral surface, the sliding surface must be lubricated with a lubricant such as grease. is required. Therefore, conventionally, as shown in FIG. On the outer peripheral surface of the long shaft portion 1a of the pivot shaft 1, a small diameter portion 1h that is stepped in the circumferential direction is provided. The small diameter portion 1h is filled with lubricant. But this one In this case, it is necessary to process the small diameter part by cutting the outer peripheral surface of the long shaft part. Cutting is laborious and complicated, and it is not acceptable to have poor workability, but it also increases costs. In addition, in small diameter sections, it is necessary to securely support the pivot shaft in the sleeve. Because of this, it is not possible to make the groove width unnecessarily wide, and for this reason, it is difficult to make the groove width There is a possibility that lubrication tends to stagnate at the pivot point, which may impede the smooth rotation of the pivot shaft. It becomes a problem.

0004

[Means to solve the problem]

In view of the above-mentioned circumstances, the present invention has been developed to develop a vehicle for use that can eliminate these drawbacks. Created for the purpose of providing a pivot shaft structure for wiper devices The wiper arm is fixed at the tip and the link arm is fixed at the base. , and the intermediate shaft length is rotated inside the cylinder of the sleeve that is integrally attached to the vehicle body. A pivot shaft rotatably supported on a pivot shaft, the outer circumferential surface of a long shaft portion of the pivot shaft being A long groove-like groove extending approximately the entire length of the long shaft portion with a closed groove end at least at one end of the long shaft portion. An appropriate number of grooves are formed in the axial direction of the pivot shaft, and the grooves are used as lubricant filling grooves. It is characterized by having the following configuration.

[0005] With this configuration, the present invention eliminates the troublesome cutting process of the outer peripheral surface and , the lubricant is evenly distributed over the sliding surface between the pivot shaft and the sleeve. It is.

[0006]

【Example】

Next, one embodiment of the present invention will be described based on the drawings. In the drawing, 1 is a vehicle It is a pivot shaft of a wiper device for a is made of a resin material (functional resin material) that is integrally attached to the vehicle body side. It is rotatably supported by a sleeve 2 having a cylindrical shape. On the other hand, sleeve 2? The base end portion 1b of the pivot shaft 1 that protrudes from the shaft has a smaller diameter than the shaft length portion 1a. , and the base end portion 1b has a link that is interlocked and connected to a wiper motor (not shown). The base end of the cross arm 3 penetrates one end of the shaft long part 1a, and is integrally formed with the shaft. Fixed. In addition, the tip 1c of the pivot shaft 1 protruding from the sleeve 2 has a , the washer 5 is assembled in contact with the distal end surface of the sleeve 2, and is inserted into the retaining groove 1d. The pivot shaft 1 is prevented from coming off from the sleeve 2 by the removably engaged C-ring 6. Furthermore, the base end of the wiper arm 4 is attached to the tip end 1c. The parts are integrally connected. Then, the pivot axis 1 is rotated as the wiper motor is driven. By rotating around the axis, the wiper arm 4 swings back and forth, and the window glass surface is not wiped. The configuration and other features are the same as before.

[0007] The outer peripheral surface of the long shaft portion 1a of the pivot shaft 1 is provided with an appropriate number of stripes (in practice) facing in the axial direction. In the example, three grooves 1e for lubricant filling are formed. In other words, groove 1 e points toward the axial direction of the long shaft portion 1a, and from the base end against which the link arm 3 abuts. , almost the entire length of the shaft length portion 1a up to the position near the tip where the washer 5 comes into contact. It has a groove shape, and is filled with an appropriate lubricant 8 such as grease. ing.

[0008] In the embodiment of the present invention constructed as described above, the wiper motor is driven The pivot shaft 1 rotates around the axis with the long shaft portion 1a sliding on the inner peripheral surface of the sleeve 2. The sliding surface between the long shaft portion 1a and the sleeve 2 is in the groove 1. It is reliably lubricated by the lubricant 8 filled in e. In other words, the groove 1e is located at the long shaft portion. 1a is long from the proximal position to a position near the distal end, and the sliding surface is approximately It is long over its entire length, making it possible to lubricate almost the entire sliding surface. No lubrication failure occurs. Moreover, the pivot shaft 1 is rotatably supported by the sleeve 2. will not be damaged. Moreover, the groove 1e has one end located at the proximal end of the long shaft portion 1a. The tip (other end) is closed at the tip of the long shaft portion 1a. Therefore, there is no problem of the lubricant 8 inadvertently flowing out, and it is highly efficient over a long period of time. This will provide lubrication.

[0009] Moreover, the pivot shaft 1 can be easily formed by cold forging as shown in FIG. However, the groove 1e can be formed without cutting the outer circumferential surface of the long shaft portion 1a as in the conventional method. The pivot shaft 1 can be formed as it is in the process of cold forging. A dedicated cutting process for forming the groove 1e is no longer required, resulting in a significant improvement in workability. This will also contribute to cost reduction. In other words, according to Figure 3, first For this purpose, the cylindrical blank 9 is machined an appropriate number of times to form a screw at the tip 1c. A portion 9a corresponding to the portion 1f, a tapered portion where the tip portion 1c is serrated. A portion 9b corresponding to 1g, a base end portion 1 through which the link arm 3 passes and is fixed by caulking. After the portion 9d corresponding to the groove 1e is formed together with the portion 9c corresponding to the groove 1e, the groove 1e is formed. Taper serrations or invoices are provided in the portion 9b corresponding to the tapered portion and the portion 9c corresponding to the proximal portion. The reut serration processing is also formed by header processing, and then C - Cutting the retaining groove 1d that engages the ring 6, and rolling a screw groove in the tip 1c. It is formed by processing and finally polishing the outer peripheral surface.

0010 It should be noted that the present invention is of course not limited to the above-mentioned embodiment, and the present invention is not limited to the second embodiment shown in FIG. As in the example, the groove 1e has a closed base end and an open tip. It's okay.

[0011] Furthermore, a third embodiment shown in FIGS. 5 and 6 may be used. This thing is Both ends of the groove 1e are closed, and by doing so, the groove 1e is closed. There is an advantage that leakage of the filled lubricant 8 can be more reliably prevented, but this also The processing procedure for cold forging can be improved by following the procedure shown in Figure 6, for example. It is possible. As explained in the first embodiment, this is a cylindrical brush. The molding can be performed in the process of header processing of the ink 9 an appropriate number of times. In other words, bra By processing the header of the link 9, a portion 9a corresponding to the threaded portion 1f and a tapered portion 1g are formed. The part 9b corresponding to At the same time as completing the corresponding portion 9a and the tapered portion 9b, the tip side is closed. In this state, a portion 9d corresponding to the groove 1e is molded. Of course, the part corresponding to the groove 1e is It may also be used as a separate header process. Next, a portion 9c corresponding to the base end 1b is shaped. However, at this time, the proximal end portion 9e of the long shaft portion is molded into an arc shape. Of course, this In this case, there is no need to fit the die into the portion 9d corresponding to the groove 1e. So When finishing the proximal end portion 9c with a header, the proximal side portion 9c is 9e of material is poured into the base end portion of the portion 9d corresponding to the groove 1e, and the material is poured into the groove 1e. The base end of the corresponding portion 9d is closed, thereby forming a groove 1e with both ends closed. It is possible.

0012

[effect]

In summary, since the present invention is constructed as described above, the pivot axis The sliding surface between the long shaft portion and the sleeve is made of moisture filled in a long groove that spans almost the entire length of the long shaft portion. It will be lubricated by the lubricant and therefore the rotation of the pivot shaft by the sleeve will be It is now possible to lubricate almost the entire sliding surface without damaging the support, eliminating lubrication. It never causes good things. Moreover, this long groove is closed at least on one end. Therefore, there is no problem of lubricant flowing out inadvertently, and efficient lubrication can be achieved over a long period of time. I can slip.

[0013] Moreover, the formation of this groove requires a process in which one end is open, so the mold is removed in the axial direction. Therefore, it is possible to form the pivot shaft as it is in the process of cold forging. This eliminates the need for a special cutting process to form grooves, improving work efficiency. This will result in a significant improvement in performance and contribute to cost reduction.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a pivot shaft.

FIG. 2 is a sectional view taken along line AA in FIG. 1;

FIG. 3 is an explanatory diagram showing a schematic processing procedure of a pivot shaft by cold forging.

FIG. 4 is a sectional view of a pivot shaft portion showing a second embodiment.

FIG. 5 is a sectional view of a pivot shaft portion showing a third embodiment.

FIG. 6 is an explanatory diagram showing a processing procedure by cold forging of a concave groove in a pivot shaft according to a third embodiment.

FIG. 7 is a sectional view of a pivot shaft portion showing a conventional example.

[Explanation of symbols]

1 Pivot axis 1a Shaft length part 1e Groove 2 Sleeve 3 Link arm 4 Wiper arm

Claims (1)

[Scope of utility model registration request] Claim 1: A wiper arm is fixed to the distal end, a link arm is fixed to the proximal end, and the intermediate shaft length part is rotatable about an axis inside a cylinder of a sleeve integrally attached to the vehicle body. A pivot shaft is provided with a long groove on the outer circumferential surface of the long shaft portion of the pivot shaft, the groove extending substantially over the entire length of the long shaft portion and having a closed groove end at least at one end of the long shaft portion.
A pivot shaft structure for a wiper device for a vehicle, characterized in that a suitable number of grooves are formed in the axial direction of the pivot shaft, and the grooves are configured as grooves for filling lubricant.