Balance shaft
阅读说明:本技术 平衡轴 (Balance shaft ) 是由 塞巴斯蒂安·科赫 斯特凡·多恩 于 2019-03-04 设计创作,主要内容包括:提出一种平衡轴(1),它包含一个带有主轴颈(7)的轴(3),所述主轴颈以部分或整个圆周对着紧接在所述主轴颈上的轴段(14、15)的轴向凸肩(13)径向凹陷;和一个布置在所述主轴颈上的、带有外环(9)的滚针轴承(4),所述外环构成滚针(6)的外部导轨。所述外环应当设置有轴向凸肩(19),其中,滚针在两个轴向方向上既支撑在轴段的轴向凸肩上也支撑在外环的轴向凸肩上。(A balance shaft (1) is proposed, comprising a shaft (3) with a main journal (7) which is radially recessed with a partial or full circumference against an axial shoulder (13) of a shaft section (14, 15) lying directly above the main journal; and a needle bearing (4) arranged on the main journal and having an outer ring (9) which forms an outer guide for the needles (6). The outer ring should be provided with an axial shoulder (19), wherein the needle rollers are supported in both axial directions both on the axial shoulder of the shaft section and on the axial shoulder of the outer ring.)
1. A balance shaft (1) comprising a shaft (3) with a main journal (7) which is radially recessed over part or the entire circumference relative to an axial shoulder (13) of a shaft section (14, 15) adjoining the main journal (7); and a needle bearing (4) arranged on the main journal (7) and having an outer ring (9) which forms an outer guide for the needle rollers (6), characterized in that the outer ring (9) is provided with an axial shoulder (19), wherein the needle rollers (6) are supported in both axial directions both on the axial shoulder (13) of the shaft sections (14, 15) and on the axial shoulder (19) of the outer ring (9).
2. The balance shaft (1) according to claim 1, characterized in that the needle rollers (6) bear axially directly on the axial shoulders (13, 19) of the shaft sections (14, 15) and the outer ring (9), respectively.
3. Balance shaft (1) according to claim 1 or 2, characterized in that the axial shoulder (19) of the outer ring (9) is constituted by a bearing ring (20) engaging with the outer ring.
4. A balance shaft (1) according to claim 3, characterized in that the outer ring (9) is provided with a shoulder (12) extending in a radially outward direction in axial overlap with the bearing ring (9).
Technical Field
The invention relates to a balance shaft comprising a shaft with a main journal which is radially recessed with a partial or full circumference against an axial shoulder of a shaft section immediately above the main journal; and a needle bearing arranged on the main journal and having an outer ring, the outer ring forming an outer guide for the needle.
Background
Such balance shafts are usually installed in mass-balanced transmissions of internal combustion engines in order to compensate for free inertia forces and/or moments of inertia.
A needle-supported shaft with a radially collapsible main journal is known from the engine journal MTZ 06/2008, pages 518 and 524. The radial bearing of the shaft is carried out on two such main journals by means of needle bearings and on the drive-side end section by means of plain bearings, which also take care of the axial bearing of the shaft. Such bearing devices may have the following disadvantages: it has three radial bearings, which are statically indeterminate.
Disclosure of Invention
The object of the invention is to provide a balance shaft with an improved bearing design.
This task is solved by the following solution, namely: the outer ring is provided with an axial shoulder, wherein the needle rollers are supported in both axial directions both on the axial shoulder of the shaft section and on the axial shoulder of the outer ring. In this embodiment, the needle bearing is used not only as a radial bearing but also as an axial bearing for the shaft, whereby, with corresponding advantages in installation space and/or component costs, the static overdetermination of the bearing arrangement is eliminated by an axial bearing support point which is independent of the needle bearing.
The support of the needles on the axial shoulder of the shaft portion and/or on the axial shoulder of the outer ring can take place indirectly via a cage for fixing the needles or in direct axial contact with the needles against the axial shoulder.
Drawings
Further features and embodiments of the invention can be taken from the following description and the drawings, in which an exemplary embodiment of the balancing shaft according to the invention is shown in a simplified manner.
FIG. 1 is a perspective view of a balance shaft with needle bearings installed;
FIG. 2 is a perspective view of the shaft shown in FIG. 1;
FIG. 3 is a longitudinal section through the axial-radial bearing of the balancing shaft shown in FIG. 1 as a detail;
Fig. 4 shows the axial-radial bearing as a separate part from fig. 3.
Detailed Description
The figure shows a balance shaft 1 for a mass-balanced transmission for balancing free second-order inertia forces and moments of inertia in an inline four-cylinder internal combustion engine. The drive of the balancing shaft takes place by means of a chain or a gear (not yet installed in the illustration) on the drive-side end segment 2.
The balancing shaft 1 comprises a shaft 3, which is shown in detail in fig. 2, and two radial bearings, which are designed as needle bearings 4 and 5, the
In the embodiment shown, the left-hand
For the mounting of the combined axial-radial bearing point, the left-hand
The radial and axial support of the shaft 3 is carried out only on the two
List of reference numerals
1 balance shaft
2 end segment on the drive side
3 shaft
4 needle roller bearing
5 needle roller bearing
6 roller pin
7 Main journal
8 Main journal
9 outer ring
10 casing
11 bearing hole
12 convex shoulder
13 axial shoulder of shaft section
14 shaft section
15 shaft section
16 shaft segment
17 rotating shaft
18 ball cage
19 axial shoulder of the outer ring
20 support ring
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