CN111271385A

CN111271385A - Fixing structure for adjusting pad of double-intermediate-shaft transmission

Info

Publication number: CN111271385A
Application number: CN202010171761.9A
Authority: CN
Inventors: 张玉同; 党玲灵
Original assignee: Shaanxi Fast Gear Co Ltd
Current assignee: Shaanxi Fast Gear Co Ltd
Priority date: 2020-03-12
Filing date: 2020-03-12
Publication date: 2020-06-12

Abstract

The invention discloses a fixing structure of an adjusting pad of a double-intermediate shaft transmission, which comprises: the surface of the second shaft is provided with at least one pair of clamp spring grooves along the circumferential direction, and the surface of the second shaft is uniformly provided with a plurality of external spline grooves along the axial direction; the two clamp springs are respectively arranged on the pair of clamp spring grooves; the adjusting cushion is arranged on a second shaft between the two clamp springs and is axially limited by the clamp springs; at least one arc-shaped groove is arranged on the inner wall of the adjusting pad; the cylindrical pin is arranged in a channel defined by the outer spline groove and the arc-shaped groove, and the cylindrical pin is limited by the two clamp springs in the axial direction. The invention is that a cylindrical pin is arranged at a certain position of each adjusting pad so as to play a role in positioning the adjusting pads in the circumferential direction. The axial positioning of the cylindrical pin is determined by the circlip. Thus, the hexagonal key is completely eliminated, and the problem of breakage of the hexagonal key is solved.

Description

Fixing structure for adjusting pad of double-intermediate-shaft transmission

Technical Field

The invention belongs to the technical field of transmissions and relates to a fixing structure for an adjusting pad of a double-intermediate-shaft transmission.

Background

At present, the adjustment pads are fixed on the double-intermediate-shaft transmission in the same industry at home and abroad by adopting the traditional elongated hexagonal key to prevent the adjustment pads from rotating in the circumferential direction.

In order to solve the problem of hexagonal key fracture, the conventional scheme is to remove the hexagonal key and replace the original hexagonal key with parts such as a cylindrical pin and the like to fix the circumferential rotation of the adjusting pad, so that the problem of hexagonal key fracture is solved.

In order to solve the problem that one or two inner teeth need to be cut off in the gear engaging sliding sleeve, the adjusting pad is fixed by the hexagonal key 1 in the original structure, and the hexagonal key is required to be placed into a spline tooth groove of the two shafts during assembly. The assembled relationship of the biaxial, spline pad and hex key is shown in fig. 1 and 2. The two-shaft sliding sleeve is matched with the external spline of the two shaft through the internal spline. Because one or two hexagonal keys are placed in the external spline groove of the two shafts, one or two internal teeth of the two-shaft sliding sleeve must be cut off, otherwise, the sliding sleeve cannot be installed on the two shafts.

Disclosure of Invention

In order to solve the problems that a hexagonal key is broken and one or two internal teeth need to be cut off when the sliding sleeve is engaged, the invention provides a fixing structure of an adjusting pad of a double-intermediate-shaft transmission, wherein the fixing structure of the adjusting pad cancels the hexagonal key. Thereby thoroughly solving the problem of the fracture of the original hexagonal bond and simultaneously increasing the use safety of the product.

The invention adopts the following technical scheme:

a dual countershaft transmission trim pad retaining structure comprising:

the surface of the second shaft is provided with at least one pair of clamp spring grooves along the circumferential direction, and the surface of the second shaft is uniformly provided with a plurality of external spline grooves along the axial direction;

the two clamp springs are respectively arranged on the pair of clamp spring grooves;

the adjusting cushion is arranged on a second shaft between the two clamp springs and is axially limited by the clamp springs; at least one arc-shaped groove is arranged on the inner wall of the adjusting pad;

the cylindrical pin is arranged in a channel defined by the outer spline groove and the arc-shaped groove, and the cylindrical pin is limited by the two clamp springs in the axial direction.

The distance between the two clamp spring grooves is equal to the axial thickness of the adjusting pad.

The inner wall of the adjusting pad is a smooth surface, and the arc-shaped groove is formed by outwards sinking the smooth surface.

The inner diameter of the adjusting pad is the same as the two-axis diameter.

The radius of the cylindrical pin is less than or equal to that of the arc-shaped groove.

When the clamp spring is arranged in the clamp spring groove, the openings of the clamp springs can be in contact with each other and are not overlapped.

The axial length of the cylindrical pin is less than or equal to the axial thickness of the adjusting pad.

The invention has the following beneficial effects:

the principle of the invention is to remove the prior hexagonal key and replace the prior hexagonal key with a cylindrical pin. While making appropriate changes to the two axes and the adjustment pad. Specifically, a cylindrical pin is arranged at a certain position of each adjusting pad so as to play a role in positioning the adjusting pads in the circumferential direction. The axial positioning of the cylindrical pin is determined by two circlips. Thus, the hexagonal key is completely eliminated, and the problem of breakage of the hexagonal key is solved. Because the cylindrical pin is only arranged at the adjusting pad, the sliding sleeve on the two shafts does not need to cut off one or two internal teeth. By adopting the new structure, the inner teeth of the sliding sleeve do not need to be cut off. The original hexagonal key can be eliminated and replaced by other parts through improvement. The hexagonal key is difficult to process, and the added cylindrical pin is a standard part. This reduces the cost and solves the problem of breaking the hexagonal key, thereby providing social benefits.

Furthermore, the two ends of the cylindrical pin are planes which can be directly contacted with the clamp spring, so that new rolling noise caused by the rotation of the cylindrical pin in the outer spline groove is prevented.

Drawings

FIG. 1 is a schematic view of a prior art structure for fixing a biaxial shaft to an adjustment pad by a hexagonal key;

FIG. 2 is a cross-sectional view of FIG. 1;

FIG. 3 is a ring-shaped clamp spring groove arranged on a biaxial;

FIG. 4 is a side view of the adjustment pad;

FIG. 5 is a schematic view of a clamp spring;

FIG. 6 is an assembled cross-sectional view of the present invention;

FIG. 7 is an assembled cross-sectional view of the present invention;

reference numerals: 1. a hex key; 2. two axes; 3. an adjustment pad; 4. a clamp spring groove; 5. an arc-shaped slot; 6. an inner wall; 7. a clamp spring; 8. a cylindrical pin; 9. the bottom diameter of the clamp spring groove; 10. an outer spline groove.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a single embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The present invention will be described in detail below with reference to the accompanying drawings.

In the prior art, as shown in fig. 1 and 2, the adjusting pad 3 is fixed in a manner that an annular groove is formed on a spline of the transmission biaxial 2, and the adjusting pad 3 is clamped in the annular groove of the biaxial 2 during assembly. The teeth of the spline pad are in contact with the spline teeth on the secondary shaft 2 to axially position; the external spline grooves of the adjusting pad 3 and the external spline grooves on the secondary shaft 2 are correspondingly arranged on the same straight line. An elongated hex key 1 is then placed in one of the outer spline grooves to prevent circumferential rotation of the adjuster pad 3. Because a hexagonal key 1 is arranged in one or two external spline grooves of the two-shaft 2, one or two internal teeth of the two-shaft 2 sliding sleeve need to be cut off.

Therefore, the invention discloses a fixing structure of an adjusting pad of a double-intermediate shaft transmission, which comprises:

the surface of the two-shaft 2 is provided with at least one pair of clamp spring grooves 4 along the circumferential direction, and the surface of the two-shaft 2 is uniformly provided with a plurality of external spline grooves 10 along the axial direction;

the two clamp springs 7 are respectively arranged on the pair of clamp spring grooves 4;

the adjusting pad 3 is sleeved on a biaxial position between the two clamp springs 7, and the axial direction of the adjusting pad 3 is limited by the clamp springs 7; the inner wall of the adjusting pad 3 is provided with at least one arc-shaped groove 5;

the cylindrical pin 8 is arranged in a channel enclosed by the outer spline groove 10 and the arc-shaped groove 5, and the cylindrical pin 8 is axially limited by the two clamp springs 7.

In a preferred embodiment, the inner wall 6 of the adjusting pad 3 is a smooth surface, the arc-shaped groove 5 is formed by outwardly sinking the smooth surface, and the radius of the cylindrical pin 8 is less than or equal to that of the arc-shaped groove 5. The axial length of the cylindrical pin 8 is less than or equal to the axial thickness of the adjusting pad 3.

The method adopted by the present invention is to remove the hexagonal key 1 and replace the hexagonal key 1 with the cylindrical pin 8. This solves the problem of breakage of the hexagonal key 1. Because the slender hexagonal key 1 is arranged in a spline groove of an external spline of the two-shaft 2, one or two internal teeth of the sliding sleeve arranged on the two-shaft 2 need to be removed, and the sliding sleeve on the two-shaft 2 does not need to be cut off after the cylindrical pin 8 is adopted, so that the strength of the sliding sleeve is increased.

The principle of the invention is to remove the previous hex key 1 and replace it with a cylindrical pin 8. The biaxial shaft 2 and the adjustment pad 3 are suitably modified. In particular, a cylindrical pin 8 is arranged at a certain position of each adjusting pad 3 so as to play a role in positioning the adjusting pad 3 in the circumferential direction. The axial positioning of the cylindrical pin 8 is determined by the circlip 7. This completely eliminates the hexagonal key 1, thereby solving the problem of breakage of the hexagonal key 1. Since the cylindrical pin 8 is only at the adjusting pad 3, the sliding sleeve on the biaxial shaft 2 does not need to cut off one or two internal teeth.

Examples

As shown in fig. 3 to 5, the biaxial shaft 2 and the adjusting pad 3 are greatly changed, the annular ring grooves 4 are added to the biaxial shaft 2 by removing all the previous annular grooves, and the distance between the two annular ring grooves 4 is equal to the thickness of the adjusting pad 3. The circlip 7 is used to determine the axial position of the adjustment pad 3 and the cylindrical pin 8. The inner wall 6 of the adjusting pad 3 is removed with all the inner teeth to form a smooth surface, an arc-shaped groove 5 is added, the inner diameter of the adjusting pad 3 is the same as the major diameter of the two shafts 2, and the thickness is unchanged. The following parts need to be added:

the added cylindrical pin 8 needs to be calculated in diameter, and cannot be too large or too small. The cylindrical pin 8 is arranged in the arc-shaped groove 5. The snap spring 7 is required to be clamped on the rear opening of the biaxial shaft 2 so as to be contacted with the opening, but not overlapped together. The adjusting pad 3 is a modified adjusting pad, and the hexagonal key 1 is eliminated. The assembled effect is shown in fig. 6 and 7.

As shown in fig. 6 and 7, the cylindrical pin 8 is stagnant in the external spline groove 10 of the biaxial shaft 2. The cylindrical pin 8 is axially limited by two clamp springs 7, and radially limited by the biaxial 2 and the adjusting pad 3. The cylindrical pin 8 is completely fixed in the external spline groove 10 of the two shaft 2.

Specifically, the thickness of the adjusting pad 3 is equal to the width between two clamp spring grooves 4 on the biaxial shaft 2. The adjusting pad 3 is assembled between the two clamp springs 7, and the adjusting pad 3 is limited from moving axially; the adjustment pad 3 cannot rotate in the circumferential direction due to the presence of the cylindrical pin 8, so that the adjustment pad 3 is fixed in the circumferential direction.

Since the cylindrical pin 8 is used, the cylindrical pin 8 is only arranged at the adjusting pad 3. So that the two-shaft 2 sliding sleeve does not need to cut one or two internal teeth. Thus, the potential safety hazard of the product is thoroughly eliminated.

The original hexagonal key 1 can be eliminated and replaced by a cylindrical pin through modification. The hexagonal key 1 is difficult to machine, and the added cylindrical pin is a standard part. This reduces the cost and solves the problem of breakage of the hexagonal key 1, thereby providing a certain social benefit.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be construed as the protection scope of the present invention.

Claims

1. A double countershaft transmission trim pad fixed structure, characterized by comprising:

the surface of the two shafts (2) is provided with at least one pair of clamp spring grooves (4) along the circumferential direction, and the surface of the two shafts (2) is uniformly provided with a plurality of external spline grooves (10) along the axial direction;

the two clamp springs (7) are respectively arranged on the pair of clamp spring grooves (4);

the adjusting pad (3) is sleeved on the two shafts between the two clamp springs (7), and the adjusting pad (3) is limited by the clamp springs (7) in the axial direction; at least one arc-shaped groove (5) is arranged on the inner wall of the adjusting pad (3);

the cylindrical pin (8) is arranged in a channel enclosed by the outer spline groove (10) and the arc-shaped groove (5), and the cylindrical pin (8) is axially limited by the two clamp springs (7).

2. A twin countershaft transmission sprag fixing structure according to claim 1, wherein the distance between the two snap spring grooves (4) is equal to the axial thickness of the sprag (3).

3. The fixing structure of the double intermediate shaft transmission adjusting pad according to claim 1, wherein the inner wall (6) of the adjusting pad (3) is a smooth surface, and the arc-shaped groove (5) is formed by outwardly recessing the smooth surface.

4. A twin countershaft transmission sprag fixing structure according to claim 1, wherein the inner diameter of the sprag (3) is the same as the diameter of the countershaft (2).

5. A twin countershaft transmission sprag fixing structure according to claim 1 wherein the radius of the cylindrical pin (8) is less than or equal to the radius of the arc-shaped slot (5).

6. The twin countershaft transmission trim pad fixing structure according to claim 1, wherein the snap spring (7) is disposed in the snap spring groove (4) such that the snap spring (7) openings are in contact and do not overlap.

7. A twin countershaft transmission sprag fixing structure according to claim 1 wherein the axial length of the cylindrical pin (8) is less than or equal to the axial thickness of the sprag (3).